Overview of reaction sintering powder:
The process of reaction sintering is as follows: firstly, α - SiC powder is mixed with silica powder Graphite powder is mixed in proportion and made by dry pressing, extrusion or grouting Porous green body.The C in the green body is in contact with liquid Si at high temperature The infiltrated Si reacts to form β - SiC, and combines with α - SiC to form β - SiC The results show that the amount of Si is filled in the pores, and the reaction sintered body without pores is compact.Reaction sintered SiC usually contains 8% free Si.Therefore, in order to ensure complete Si infiltration, the blank should have enough porosity.Generally, the proper green density can be obtained by adjusting the content of α - SiC and C in the initial mixture, the particle size distribution of α - SiC, the shape and particle size of C and the forming pressure.
The F240 and f1200 reaction sintering special silicon carbide powder produced by the company is mainly used in the field of reaction sintering silicon carbide products, with the advantages of high purity, good particle shape, strong fluidity and reasonable particle size distribution.
Main technical specifications:
Name product | Specification and granularity | Appearance color | Purity (%) | Iron (%) | Carbon (%) |
Reaction sintering micro powder | F240 F1200 |
Pure green |
≥99 |
≤0.02 |
≤0.01 |
Other specifications can be customized according to user requirements
Main uses of reaction sintering powder:
Reaction sintered silicon carbide has the advantages of high thermal conductivity, low coefficient of thermal expansion, high strength, net size sintering (no change in size before and after sintering) and easy preparation of large complex shape products. Its cost is far lower than that of hot pressed and pressureless sintered silicon carbide. It is a kind of engineering ceramic material with wide application prospect. It has been widely used in mechanical seal high temperature valves, heat exchangers and sliding joints abroadBearing, etc.
The difference between reaction sintering and pressureless sintering is as follows
Reaction sintering silicon carbide powder and pressureless sintering silicon carbide powder are two kinds of sintering process of silicon carbide products. Due to the different sintering process, the performance of the products are also different, mainly in the pressureless sintering silicon carbide material technical parameters and reaction sintering silicon carbide material technical parameters.The firing process is different.Reactive sintering is to make free silicon penetrate into silicon carbide at a lower temperature.Pressureless sintering is a silicon carbide product that shrinks naturally at 2100 ℃.The technical parameters of sintered products are different.The volume density, hardness and compressive strength of the reaction are different from those of pressureless SiC products.The product performance is different.Reaction sintering products and pressureless products in different pH, temperature and other circumstances, the use time is different.