SiO2, C, and SIC's reaction freedom can see Table 1.

The freedom of reaction between SIO2, C and SIC

The reaction of carbon and silicon is shown in Figure 2 with changes in temperature.

The reaction of carbon and silicon changes with the temperature

The thermal treatment temperature of graphite matrix materials (reflects its graphite), thermal expansion coefficient, pore rate and pore diameter size and distribution have a great impact on the seepage process. In order to obtain a good performance of siliconized graphite, the thermal expansion coefficient of graphite matrix materials should be as close to SIC as much as possible. It is best to use the same -sex graphite. The open air pores should be 12%to 15%. The above methods can be carried out according to the needs. For example, first use the CVR method, and then use the CVD method to process it, so that the obtained siliconized graphite is not breathable and free of free silicon. Silicon goblin has the characteristics of carbon and silicon carbide. Its typical performance is shown in Table 2.

Typical performance of silica graphic graphite