Silicon carbide ceramics have high strength, high hardness, high wear resistance and other mechanical properties, as well as chemical resistance, etc., and have been widely used in various industrial fields and aerospace fields.
After entering the new century, the excellent properties of silicon carbide materials have been widely used. Of course, different manufacturing processes have certain product properties. With the birth of some silicon powders, silicon carbide materials are becoming more and more perfect:
Silicon carbide ceramic products
At present, it is still a problem to prepare high-solid, thickened and sub-micron silicon carbide powder. The process is complicated and the production cost is relatively expensive.
At present, reducing the combustion temperature of silicon carbide ceramics and looking for new and inexpensive processes are still the focus of material process research. It is also an important task for related scientific researchers.
Let’s take a look at the advantages and disadvantages of several of the most common processes.
1. The ten method of reaction has characteristics and the advantages of low temperature, but at the same time, there is a margin in the clean green body during the whole process, which can reduce the temperature of part of the material.
2. The raw material method can produce pure high-grade nano-powders, and the compounding of the powders is also easy; and the compounding can produce silicon carbide ceramics that reduce silicon. Because of the strong valence of silicon carbide, it must be added to the green body. The combination of auxiliary agents can make the silicon carbide body compact.
3. Hot compressive strength, hot isostatic strength and spark characteristics. Silicon carbide performance, its strength and strength should be non-compressive strength, but in the detailed process, auxiliary bodies need to be added for densification and the production cost is high, which is not suitable for manufacturing special-shaped parts. .
4. The microphysical vapor transmission method can produce high density and high compactness, but its micro-fine micro-crystallization technology affects the performance of the product.
5. In the synthesis method, the solid-phase method has scarce raw materials, stable quality, and easy realization of industrial production. Its main advantages are still a dominant production method. Among them, the annual output of SiC prepared by the Acheson method is 1 million. More than tons, the domestic annual output is nearly 30 tons.
6. The particle agglomeration volume is small and the volume is high, and the particle agglomeration volume is small, which can be controlled, but the output is high and low, and it is not easy to realize large-volume production.
In summary, the application of silicon carbide ceramics has a variety of excellent properties, which has significantly caused widespread absorption. In the field of inorganic silicon carbide non-materials, its tentacles are almost a family of fields. Because the manufacturing process of silicon carbide ceramics is difficult to achieve, it is widespread in all industrial fields. The firing temperature of primary silicon carbide ceramics and the search for new and inexpensive production processes are still cost reductions. The research focus of material scientist Fu, while focusing on and developing all the advantages of silicon carbide for mankind is the primary task of researchers in related units.
Future research focus
1. Mainly through various improvement processes to reduce production costs, increase product size, and through second phase enhancement to improve process performance, etc., so as to achieve major industrial production and meet the performance requirements of related materials in industry and application fields.
2. In addition, silicon carbide ceramics have special functions, strength, wear resistance, thermal shock resistance, and are widely used. Silicon carbide plays an important role in the field of materials. Therefore, there is an urgent need for more in-depth research on silicon carbide materials in order to continuously improve its excellent performance, reduce production costs, simplify production processes, and promote the industrialization of silicon carbide products.
Now, the industrial integration of China’s silicon carbide abrasive powder industry has basically been completed. After a five-year depression, small businesses have no room for growth. Of the companies have already entered the industry’s earlier, relatively early large-scale enterprise technology enterprises. I believe that silicon carbide ceramics will bring us future development and applications.
Post time: Jul-14-2021