The recrystallized raw material reaction sintered silicon carbide has good corrosion resistance

Recrystallized raw material recrystallized silicon carbide silicon carbide products can be classified according to SiC content, binder type and addition amount. The performance of the material largely depends on the bonding status between SiC particles in the material. Therefore, according to the binder type, silicon carbide products are divided into the following types:

(1) Oxidation bonded silicon carbide: Al2O3-SiO2 series silicates are used as the bonding phase, including clay bonding, mullite bonding and SiO2 bonding SiC

(2) Nitride bonded SiC: covalent compounds such as bonded phase si3n4si2n2o.

(3) Self bonded SiC: including β- SiC combines SiC and recrystallized SiC.

(4) Silicon infiltration reaction sintering silicon carbide SiC: a SiC engineering ceramic material composed of SiC and free silicon.

In addition, refractory products with SiC content less than 50% are usually called semi SiC products.

Reaction sintered silicon carbide as refractory has the following characteristics:

① Fire resistance above 1600 ℃;

② High thermal conductivity;

③ High strength, high wear resistance;

④ Good erosion resistance;

⑤ Good thermal shock resistance;

⑥ Low cost, high life

Principle of reaction sintering silicon carbide reaction bonded silicon carbide refers to that the blank contains silicon carbide and carbon powder. In the reaction process, carbon and silicon react to form a new silicon carbide phase, which is combined with the original silicon carbide to form a silicon carbide composite. The preparation process is as follows: silicon carbide powder, carbon powder and organic binder are mixed, formed, dried, debonded, and finally siliconized.

The density of sintered silicon carbide can reach 3.08, which has good wear resistance and corrosion resistance, and is very popular with the market.

Reaction sintered silicon carbide is also called activated sintering or enhanced sintering.

More strictly, activated sintering and enhanced sintering are different.

Activated sintering refers to a sintering method that can reduce the sintering activation energy, make the sintering of the system proceed at a faster speed at a lower temperature, and improve the properties of the sintered body.

Enhanced sintering generally refers to all sintering processes that can increase the sintering rate or enhance the properties of sintered body (by alloying or inhibiting grain growth).