Abstract
Shock compaction features are experimentally investigated for some selected ceramic materials and ceramic composite systems, i.e. SiC, AIN, SiC/AIN, and AIN/Al2O3. A typical microstructure to support the skin model proposed in a previous paper is obtained by using SiC powder with a particle diameter of several micrometres. AIN transforms into an unknown phase. The transformation needs a small amount of oxygen. The amount of the unknown new phase decreases with the increase of shock temperature. Chemical reaction of AIN/Al2O3 mixture into ALON (cubic aluminium oxynitride spinel) occurs under shock loading and proceeds along with increasing shock temperature. Crystallite size and microstrain of the samples are determined by X-ray line broadening analysis. The microstrain for mixture sample and fine powder is larger than that for single-component sample and coarse powder, respectively. As suggested by the skin model, the requirement that the initial particle size is less than 1 μm is essential for ceramic powder to be consolidated by a shock compaction technique in order to yield good compacts of optimum strength and to achieve chemical reaction accompanying mass transport.
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