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Relationship between the quality of Reaction Bonded Silicon Carbide and sintering temperature
- Nov 13, 2018 -

The reaction-sintered silicon carbide product is formed by reaction sintering, so the sintering temperature is critical to the quality of the product of the reaction-sintered silicon carbide product. Tests have shown that the sintering temperature is closely related to the compactness and mechanical properties of the reaction-sintered silicon carbide product.

 

Under the test conditions, the sintering temperature is in the range of 2160 to 2220 °C, and the relative density of the sintered body of the reaction-sintered silicon carbide product exceeds 96%. When the sintering temperature is 2220 ° C, the density of the sintered body is the highest, reaching a relative density of 98%, a flexural strength of 39,913 MPa, and a Vickers hardness of 2,318 GPa. The relationship between the bending strength as a function of density is approximately linear. The Vickers hardness value changes with temperature and the bending strength is similar, but the fluctuation range is small.

 

At the same time, the XRD scanning line of the sintered body of the reaction-sintered silicon carbide product has a high degree of conformity with the line of the raw material powder, indicating that no phase transformation occurs during the sintering process, which is consistent with the raw material powder which is mainly composed of α2SiC. However, the intensity of several main lines of products sintered at a high temperature of 250 °C has undergone a large change, which is estimated to be related to grain growth.

 

When the sintering temperature of the reaction-sintered silicon carbide product is low, the sintered body has more pores and a lower density. At a suitable sintering temperature, the grains start to grow slightly, and the sintered body has a higher density; the excessively high sintering temperature causes The grain grows abnormally, but the structure is loose and the density decreases. For density and flexural strength and hardness values, the optimum sintering temperature is consistent at around 2200 °C.http://www.hshightec.com/