Mechanical Strength of Silicon Carbide Bonded with Iraqi Clays


Two types of Iraqi clays (Kaolin and Bentonite) were used in bonding processwith different weight percentage (5%, 10%, 15%, 20%, and 25%) and withdifferent particle size from clays and silicon carbide.The specimens were formed by using low biaxial pressing and two types ofinternal lubricants (sodium silicate and the carbon paste) to increase thespecimen's cohesion. These specimens were sintered at various temperatures of(1100°C, 1200°C, 1300°C, and 1400°C).Increasing of clay percentage leads to decreasing the porosity. But it leads toincrease mechanical properties (compressive strength, diametrical strength andbending strength ). Also, the effect of particle size on all properties is studiedtogether with sintering temperature. All mechanical properties (when bonded SiCwith bentonite) are higher than kaolin bonded SiC.