Discover the Durability of Silicon Carbide Crucibles vs Graphite

 

 

In the field of material processing, choosing the right crucible is crucial to ensure the smooth progress of the production process and product quality. Silicon Carbide (SiC) crucible and graphite crucible as two common high temperature resistant containers, each has unique characteristics and advantages. The purpose of this paper is to discuss the durability of these two kinds of crucible, and to provide a reference for users by analyzing their material characteristics and application scenarios.

Silicon Carbide Crucibles and Their Applications

The silicon carbide crucible is a bowl-shaped container made of silicon and carbon as the main components, and its unique material composition makes it have excellent high temperature and corrosion resistance. In high temperature and harsh environment, silicon carbide crucible can maintain the stability and integrity of the structure, so it is widely used in many industrial fields. These fields include, but are not limited to, metallurgy, glass manufacturing, and the processing of semiconductor materials. Silicon carbide crucible can not only withstand extreme temperature changes, but also effectively resist the erosion of molten materials, thus extending the service life.

Characteristics and Uses of Graphite Crucibles

Graphite crucible is known for its smooth surface and chemical inertness, and can maintain stable properties even at extreme temperatures. Graphite crucibles are mainly used in the melting and manufacturing of metals because they are not easy to crack at high temperatures and have good chemical inertness to molten materials. This means that when using a graphite crucible, the user does not have to worry about a chemical reaction between the crucible and the molten material, thus avoiding the risk of contamination. These properties of graphite crucible make it an ideal choice for metal smelting and alloy preparation.

Comparing the Durability of Silicon Carbide and Graphite Crucibles

Although graphite crucible and silicon carbide crucible are known for their excellent durability, but in long-term use, silicon carbide crucible often show a longer service life. This is mainly due to the fact that silicon carbide materials are more resistant to oxidation. Graphite crucible is easy to react with oxygen at high temperatures, resulting in gradual erosion and weakening of the material, which ultimately affects the structural integrity and service life of the crucible. In contrast, the silicon carbide crucible, due to its high resistance to oxidation, can maintain the stability of the structure in harsher environments, thus extending the service life.

 

In summary, silicon carbide crucible and graphite crucible play an important role in the field of material processing. However, in terms of durability, silicon carbide crucible often shows a longer service life due to its excellent high temperature resistance, corrosion resistance and high resistance to oxidation. Therefore, when choosing a crucible, the user should comprehensively consider the characteristics and cost effectiveness of the material according to the specific application scenarios and needs to make the most suitable choice. Whether it is silicon carbide crucible or graphite crucible, they all play an irreplaceable role in their respective fields of application, and jointly promote the progress and development of material processing technology.

 

Compare Silicon Carbide Crucible vs Graphite Crucible

 

In the field of metal melting manufacturing, silicon carbide crucible and graphite crucible are widely used because of their excellent flexibility and durability. However, the two types of crucible show significant differences in many aspects, this article will in-depth explore the ATCERA brand silicon carbide crucible and graphite crucible performance comparison, to help users make the best choice according to actual needs.

 

 

Silicon Carbide Crucible vs Graphite Crucible: High Temperature Resistance

Silicon carbide crucible and graphite crucible are suitable for high temperature processing operations, but their high temperature resistance is different. The graphite crucible is particularly outstanding in terms of high temperature resistance, which can withstand a high temperature of about 3000°C, and almost no thermal expansion occurs at this temperature, so it has very high cracking resistance. In contrast, the maximum temperature resistance of silicon carbide crucible is usually between 1600°C and 1800°C, although slightly worse than graphite, but still far more than other materials. In addition, the silicon carbide crucible performs well in resistance to thermal shock, with good durability and crack resistance.

 

Chemical Compatibility of Silicon Carbide and Graphite Crucibles

In the process of manufacturing molten materials, it is often necessary to control the environment to avoid oxidation risks. Because of its excellent thermal stability, the silicon carbide crucible performs well in the acid-base environment, and has a high immunity to chemical attack even when exposed to air at high temperatures. The graphite crucible is easier to burn, especially in open air and high heat environments. However, in the environment of inert gases and reducing elements, graphite crucible can maintain chemical stability. In order to enhance the oxidation resistance of graphite crucible, the use of protective coating can be considered.

 

Material Composition: Silicon Carbide Crucible vs Graphite Crucible

The unique properties of silicon carbide crucible and graphite crucible are derived from their different material compositions. Silicon carbide crucible is mainly composed of silicon and carbon, giving it excellent thermal conductivity and hardness. Some silicon carbide crucible also add additives such as fillers and adhesives to enhance some of its characteristics, such as silicon carbide crucible containing silicon nitride adhesive has higher strength and oxidation resistance. The graphite crucible has high temperature resistance and hardness due to the concentration of high purity carbon in its structure, while adding adhesives such as clay to improve its performance.

 

Mechanical Strength Comparison: Silicon Carbide Crucible and Graphite Crucible

The mechanical strength of the crucible can be evaluated by analyzing characteristics such as hardness, elastic modulus and wear resistance. Silicon carbide crucibles are relatively hard and have high thermal shock resistance, so there is a low risk of deformation and fracture when subjected to heavy loads and rapid temperature changes. In contrast, the brittleness of graphite crucible is higher, relatively weak, and more prone to wear due to oxidation. Nevertheless, graphite crucible still has excellent thermal stability.

 

Cost Analysis: Silicon Carbide Crucible and Graphite Crucible

Crucible prices vary depending on size, customization and quality. Silicon carbide crucible due to the relative scarcity of materials, the price is relatively high, but because of its excellent oxidation and fatigue resistance, longer service life, the price range is usually 20 to more than 500 US dollars. Graphite crucibles are widely available because of pure graphite, and the price is relatively low, usually between $10 and $500.

 

Electrical Conductivity: Silicon Carbide Crucible vs Graphite Crucible

Some applications such as electrolysis and induction heating require the crucible to conduct current. The structure of graphite allows electrons to move, so it has high electrical conductivity, usually between 700 and 2000 S/m, suitable for electrical furnaces and induction heating. In contrast, silicon carbide crucibles have a low conductivity of 0.1 to 10 S/m, but perform well in resistance heating applications such as kilns and non-electrical melting operations.

 

Thermal Shock Resistance: Silicon Carbide Crucible and Graphite Crucible

Graphite and silicon carbide crucibles dominate casting applications where rapid temperature changes are required. Graphite crucible has low thermal expansion, high temperature resistance and high thermal conductivity, so it has excellent thermal shock resistance. Although the silicon carbide crucible also showed good thermal shock resistance, it was slightly worse than graphite. The resistance of silicon carbide to rapid heating and cooling reflects its moderate thermal expansion and inherent mechanical strength, but more attention should be paid to preventing cracking when used.

 

Common Uses of Silicon Carbide Crucible and Graphite Crucible

The advantages and disadvantages of silicon carbide crucible and graphite crucible determine their application fields. Because of its excellent heat resistance, graphite crucible is the ideal choice for metal casting and high temperature furnace, but also widely used in high temperature laboratory testing. The silicon carbide crucible is suitable for the treatment of chemical materials due to its chemical inertia and oxidation resistance, and is highly respected in foundries, especially when casting metals such as aluminum, iron and copper.

Feature	Silicon Carbide Crucible	Graphite Crucible
High Temp. Resistance	1600°C-1800°C	Up to 3000°C
Chemical Compatibility	Good acid-base resistance	Easier to burn in open air
Material Composition	Silicon & carbon-based	High purity carbon
Mechanical Strength	Hard, high thermal shock resistance	Brittle, weaker under oxidation
Cost	Higher, $20−500+	Lower, $10−500
Electrical Conductivity	Low, 0.1-10 S/m	High, 700-2000 S/m
Thermal Shock Resistance	Good, moderate expansion	Excellent, low expansion
Common Uses	Chemical materials, foundries	Metal casting, high temp. furnaces

 

In summary, ATCERA silicon carbide crucible in high temperature resistance, chemical compatibility, material composition, mechanical strength, cost, electrical conductivity, thermal shock resistance and application fields have their own characteristics. Users should choose the most suitable type of crucible according to the specific needs and use scenarios, considering the performance. Whether it is silicon carbide crucible or graphite crucible, they play an irreplaceable role in their respective application fields, and jointly promote the development of material processing technology.

2023 Virtual Distributor Conference Successfully Concluded

On 1st - 2 ed December 2022, Meling biomedical had successfully hold 2023 virtual distributor conference Two Decades New Pages. For some reasons, our customers could not be here in person, Meling Biomedical adopted the way of “inline + offline”cloud live broadcast. 

At the beginning of the meeting, Johnson Qu, Chairman of Meling Biomedical , delivered a speech to express warm welcome and heartfelt thanks to all the distributors presented. He said that 2022 is a year full of challenges and also a year of rapid development.With the increasingly competition, the refrigeration industry has entered a new consumption era which need us to combine the trend of the times and past successful experience to build differentiation advantages in cryogenic preservation.  In the uncertain future, the only certainty is that only self reform, innovation and cooperation can embrace bright future. Meling Biomedical will continue to be always been pragmatic and resilient.

Queenie Zhang, General Manager of Meling Biomedical’s overseas department comprehensively shared series of strategy in terms of brand upgrading, marketing upgrading and promotion upgrading. Queenie said, based on more than 20 years of profound precipitation and development and in line with the trend of diversified clients demands, changing market environment and channel changes, with“better life,better science" as core, Meling Biomedical will deepen market services,promote upgrading and enhance brand competitiveness.

At the meeting, Leo Li, Deputy General Manager of Meling Biomedical's overseas department officially released our product  strategy in the year of 2023 and future improving products in all aspects to help distributors open up markets and empower distributors.

In 2022, our distributors calmly responded to market changes, tried their best to expend local market share through flexible operations. In order to deeply record their efforts, Meling Biomedical hold a simple but grand award ceremony for our clients. Besides, on behalf of Meling Biomedical ,Johnson Qu extend hearty appreciation to all of them !

In 2023, Meling Biomedical will continue to strengthen advantages in product quality, technological innovation, capacity scale and after-sales service to launch more high-performance products and provide stable high-quality support for distributors to achieve a win-win cooperation!

 

Africa Health 2022:Meling Biomedical to see you at Booth C19

26-28 October 2022, Meling Biomedical and local clients jointly participated in Africa Health 2022 in Gallagher Convention Centre, Johannesburg,South Africa. At this exhibition those are on display.

-40℃~-86℃Intelligent Touch Screen Ultra Low Freezer DW-HL778SA,

-10℃~-25℃ Biomedical Freezer DW-YL270,

-20℃~-40℃ Ultra-Low Temperature Freezer DW-FL528

 2℃~-8℃ Pharmacy Refrigerator YC-315L

Vistors shows great interests in our ultra low temperature freezers and pharmacy refrigerators on Africa Health's opening day.

 

 With more than 7,000 attendees, 2,500 delegates, 250 exhibitors and over 55 countries represented, Africa Health is in the rank of the premier medical industry exhibition in sub Saharan region.We hope through this broad  platform, we can make customers to get better service which meets local markets needs and contributes to people’s health and do better in life science.

 

 Waiting for you at Booth C19!

Friendly cooperation  between Meling Biomedical and Thailand Laboratory 

Last month, Meling Biomedical team member had paid a return visit to Thailand to visit local customers among whom Meling Biomedical members have been invited to meet with a Thailand laboratory client, Thailand chandrakasem rajabhat university, previously purchased a batch of 2℃~8℃ pharmacy refrigerator YC-1015L.They expressed satisfaction with products and looking forward to the next cooperation. 

Founded in 1940,Chandrakasem Rajabhat University  is a tertiary educational institution in the north of Bangkok, Thailand and was Thailand's first training college for secondary school teachers, named an outstanding tertiary educational institute by the Ministry of Education dedicating to make contribution to national development.

“In the past, before we use Meling’s products, the refrigerator we use... is tended to become frosting which was very serious and brought a constant troubles for our laboratory researchers. And now we are quite like the design of your YC-1505. It’s no need for us to worry defrosting any more which brings convenience of our daily job.And they have well run well over years.Our enduring affection for it probably owes much to its easy to operate and guaranteed quality”Words from laboratory personnel.

That is because it has electrical heating + LOW-E design with double consideration to achieve a better anti-condensation effect for the glass door. And this pharmaceutical fridge is designed with high-quality shelves made from PVC-coated steel wire with tag card for easily cleaning. And you can have an invisible door handle, ensuring elegance of appearance. Also, it is self-closing in case the samples are damaged due to user’s forgetting to close the door.The standard remote alarm contact and various audible and visible alarms also allows users to obtain alarm information in time.

Besides,with a U-disk connected, the temperature data of YC-1015L can be stored continuously and automatically, in more than 2 years. It is 100% CFC free design for environment friendly with no ozone-damaging chemicals and is suitable for storage of biological products, vaccines, drugs, reagents, and more. You can apply the lab / pharmacy fridge in pharmaceutical factories, hospital, centers for disease prevention and control, clinics, and others..

Rooting in refrigeration industry for over two decades years, Meling Biomeidcal is devoted to creating better products for users, give more benefits to customers. 

Green Refrigeration - Meling Biomedical Safeguards Global Environment

Recently, a new study released by the United Nations found that the huge hole in the ozone layer over Antarctica is slowly “healing” and is expected to be repaired within 40 years. 

By 2100,it is hoped that will be contribute to reduce global temperature rise of 0.3 to 0.5°C.Scientists first determined in the 1970s that CFCs were depleting the ozone layer in the atmosphere. CFCs are commonly found in refrigerators, aerosols and solvents, but refrigerators containing CFCs were popular until researchers discovered an ozone hole over Antarctica in the mid-1980s.

According to reports, since 2000 , the area and depth of the Antarctic ozone hole have been slowly diminished. If current improvement can be continued, it is expected that the ozone layer over the Arctic and the Antarctic will be return to the level before the hole appeared respectively around in 2045 and 2066.

Also according to the Associated Press, the success in decreasing ozone-depleting chemicals tell us what we can do. As it’s quite urgent, we must do something to reduce greenhouse gases and make temperature rise slow down.

As pioneer in refrigeration industry, Meling Biomedical actively responded to the call and developed and produced environment-friendly freezers.

Take -86°C Ultra Low Temperature Freezer HC series as example, it has several strength in following aspects with the hydrocarbon refrigerant and patent technology :

Its main refrigerants components propane and butane, came from catalytic cracking, not damaging the ozone layer and good for the atmosphere.HC refrigerant with ultra low GWP minimize thermal radiation, meanwhile to reduce HVAC energy consumption. It can reduce power consumption, save the operating cost of the system and the comprehensive energy saving rate can reach 15% ~ 35%. 

As national new high-tech enterprise, Meling Biomeidcal has root in refrigeration industry over two decades, engaging in life science and cold chain solutions.We are aiming to research and develop cryogenic preservation for medical health care and life science.

Meling Biomedical Caring about the life, Caring for the health!

 

 

 

 

LANGEBIO Reintroduced Meling Biomedical Ultra Low Temperature Freezers

Partners from Mexican National Laboratory of Genomics for Biodiversity (LANGEBIO) Institute has purchased a batch of Meling Biomedical freezers to save biological sample. 

LANGEBIO , as one of the two of the Irapuato campus of the Center for Research and Advanced Studies, have a unit made up of experts and the necessary equipment to develop large-scale genomic projects to offer scientific services in genome sequencing and analysis to the CINVESTAV community, as well as to other national and international institutions to make contribution to Mexico .

They had purchased Meling Biomedical’s first generation products about seven years ago. They have been in well running and performing their duties to guard sample safety, which has obtained consistent praise from laboratory manager. “It has been so many years and Meling Biomedical’s freezers do well in plasma sample storage.So we choose Meling again when we need more refrigerators.We trust Meling for its ...product quality and service.”praised by users. 

The freezers LANGEBIO chose this time is Intelligent Touch Screen series.It has RS485 interface compliance to MODEBUS protocol  able to transfer data with BMS console.Direct cooling circulation technology with coil evaporator maintains a uniform temperature throughout the chamber and ensure its excellent temperature uniformity.

Our ultra low temperature series adopt unique technology with high-efficiency refrigeration system with the imported high-efficiency compressor and EBM fan are energy-saving and highly efficient. It’s condenser is designed perfectly for temperature stability and refrigeration system reliability since the vacuum insulation panels allow for increased internal capacity with the same footprint as traditionally foamed freezers, as well as it ensures excellent temperature stability.

Meling Biomedical is aimed to achieve customers and serve users, we will continue to stand on innovation-oriented development, upgrade to meet advanced international ones through improving the quality of products and services to encourage more domestic and foreign users to choose Chinese goods and services.

 

 

 Meling Biomedical Freezers Run well in Singapore Hospital

Meling Biomedical team of Asia business division paid a return visit to Singapore.During the customer visit, our team member visited KK Women's and Children's Hospital and Changi General Hospital that had previously purchased the ultra-low temperature freezer DW-HL340 and DW-HL218 to storage sample. 

Meling Biomedical is delighted to offer quality products and service to Singapore hospital. Both of the two hospital are of great significance to Singapore. KK Women's and Children's Hospital, the largest public hospital specializing in healthcare for women and children in Singapore, is know as the birthplace of a significant proportion of Singaporeans, having delivered more than half of total newborns in the country .As of Changi General Hospital,it is local first purpose-built general hospital to serve communities in the east and north-east regions. 

For years, Meling Biomedical’s freezers have remained working quietly and steadily in hospitals. When it comes to the freezer’s performance, “We like the super safe audible and visual alarm system,it helps us work easily. When we leave the office, it still guard the safety of samples.” the customer smiled.

The ultra-low temperature freezer DW-HL340 is perfectly designed for storage of low temperature scientific experiments. It also owns audible and visible alarm system, multiple alarms including high temperature alarm, low temperature alarm, power failure alarm, low battery alarm, sensor failure alarm,  door ajar alarm, high ambient temperature alarm, communication failure alarm, battery power detection failure alarm and condenser overheating alarm etc.

It is equipped with VIP Plus vacuum insulation foaming door with seal to well keep the temperature uniformity and avoid overheating. And the six sides of the cabinet are made from high-performance vacuum insulation materials, which can perfectly improve the thermal insulation performance.

Meling Biomedical has been focusing on cryogenic refrigeration industry for 30 years, breaking the technical barriers with many core leading technologies.We are aimed to meet users’ demands and exceed their expectations. Meling Biomedical’s research and development and team applies themselves to making series of scientific and technological innovation and utility model patents and working to offer our partners attentive service.

Seven Years without Any Faults, Safeguarding Plasma Sample

          -Meling Biomedical Freezers Work Well In Turkey

In October 2022,  Meling Biomedical team have paid a visit to Ankara, capital of  Türkiye, to visit the client，Red Crescent Ankara  Laboratoy, who  purchased -86℃ Ultra Low Temperature Freezers to store plasma sample .

Red Crescent has four laboratories in Turkey ,respectively located in Istanbul, Ankara, Izmir and Adana. Affiliated to Red Crescent Associations, Ankara Laboratory also share responsibilities and duties in preventing and alleviating people’s suffering since it was found.And it mainly focuses on plasma testing and research to endeavor to relieve the agony of individuals, being guided by their needs and to give priority to the most urgent cases of distress. 

Meling Biomedical -86℃ Ultra Low Temperature Freezers do well in plasma sample storage.The freezer uses high-efficiency compressor to fast refrigeration for target temperature and provide better temperature performance for long- time working. Meling Biomedical freezers has been in stable operation  with no fault in Turkey for seven years.

Since 2015, Meling Biomedical freezers have been in well running and diligently performing their duties to guard sample safety, which has acquired consistent high praise from laboratory manager and technical director. “Meling Biomedical’s products have precised temperature control and Meling team gave us  comprehensive customer service. Seven Years without Any Faults, Carefully Safeguarding Plasma Sample！”praised by users.

It’s a great honor for Meling Biomedical to users’ demands and exceed their expectations. Own a high-quality research and development team, Meling Biomedical applies ourselves to making series of scientific and technological innovation and utility model patents and working to offer our partners attentive service.

Meling biomedical Member was awarded as “Model Worker”

Recently, Haisheng Liu, vice class monitor of the manufacturing center in Meling Biomedical was awarded as "Anhui Model Worker". The commendation ceremony was hold in Hefe city, Anhui province to praise provincial model and advanced workers and collectives with leaders of Anhui provincial party committee and Governor attended. 

Meling Biomedical has a research and development center of more than 5,000 square meters, a main workshop of more than 85,000 square meters, an internationally leading production line of automatic low-temperature equipment, a testing line, and a well-equipped pilot workshop and type laboratory. 

Since joining Meling biomeidcal in 2017, Haisheng Liu has been working hard successively serving as welder, welding chief operator, welding engineer, trainee monitor and deputy monitor in manufacturing center. With excellent skills, he has obtained a lot praise including honorary title of 2020 Hefei City Model Worker , 3rd place in the 2020 Changhong Group Brazer Professional Skills Competition , Meling Biomedical 's Craftsmen in 2020, the2nd place in Meling Biomedical’s first welding competition and etc.

In order to explore and cultivate more talent , Meling Biomedical has made full use of the training system of "helping and guiding" which can ensure that our staff keep learning skill and making progress. Haisheng Liu definitely got favors from it. Because of his predecessor’s words and guide he Immerse himself in welding and became an expert in this field. Now Haisheng Liu, as welding specialist, is carefully expounding welding materials for apprentices, expertly fixing the welding frame, precisely demonstrating key points of welding task which is injecting vigor to the innovative development of the welding work.

Meling Biomedical team has many comrade sharing the same craftsmanship with Haisheng Liu who persists in consistently learning and innovating boldly and focusing on refrigeration. Concentrating on painstaking research, development and innovation, we’re committed to providing safe, stable and high-quality products for the life science field and making contributions to the life and health of people around the world.