The reaction sintering method of SiC was first successfully studied in the United States. The process of reaction sintering is as follows: firstly － SiC powder and graphite powder are mixed in proportion, and the porous green body is made by dry pressing, extrusion or grouting. When contacted with liquid Si at high temperature, C in the green body reacts with infiltrated Si to form － SiC, and with ) SiC egattibwa, era SI esukkiridde ejjula mu buziba, bwe kityo ne kifuna omubiri ogutali gwa buziba era ogw’amaanyi ogw’okuddamu . reaction sintered sic gutera okubaamu 8% free SI. n’olwekyo, okusobola okukakasa nti SI emaliridde okuyingizibwa, obuziba obumala bulina obuziba obumala . okutwalira awamu, nga batereeza okutabula okusooka － party of contents the content and ctents － part distribution and c, centricing and ctently the partisty and the content and ctenting － part distribution and cltment and cltment and c, part distribution and cltent and the part distribution and cltment and clisity) wa SiC, enkula n’obunene bw’obutundutundu bwa C, era puleesa y’okubumba esobola okukozesebwa okufuna density ya green esaanira.
The experiments show that the SiC ceramics with pressureless sintering, hot pressing sintering, hot isostatic pressing sintering and reaction sintering have different performance characteristics. If hot press sintering and hot isostatic pressing sintering SiC ceramics are relatively high in terms of sintering density and bending strength, Reaction Sintering SiC is relatively low. On the other hand, the mechanical properties of SiC ceramics are also different with different sintering additives. Pressureless sintering, hot pressing and Reaction Sintering SiC ceramics have good resistance to strong acids and alkalis, but Reaction Sintering SiC ceramics have poor resistance to ultra strong acids such as HF. When the temperature is lower than 900℃, the strength of almost all SiC ceramics erongoosebwa; When the temperature exceeds 1400℃, the bending strength of reaction sintered SiC ceramics decreases sharply. (this is because the sintered body contains a certain amount of free Si, and the bending strength drops sharply when it exceeds a certain temperature.) for SiC ceramics sintered by pressureless sintering and hot isostatic pressing, the high-temperature resistance is mainly affected by Ekika ky’ebirungo ebigattibwamu .
