Mechanical strength of silicon carbide bonded with Iraqi clays

Abstract EN

Two types of Iraqi clays (Kaolin and Bentonite) were used in bonding process with different weight percentage (5 %, 10 %, 15 %, 20 %, and 25 %) and with different particle size from clays and silicon carbide.

The specimens were formed by using low biaxial pressing and two types of internal lubricants (sodium silicate and the carbon paste) to increase the specimen'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 to increase mechanical properties (compressive strength, diametrical strength and bending strength).

Also, the effect of particle size on all properties is studied together with sintering temperature.

All mechanical properties (when bonded SiC with bentonite) are higher than kaolin bonded SiC.