Reaction of composite ceramic materials with corrosionally active media

The oxidation of composite powders and monolithic AlN - SiC, AlN - SiC - Ti B2, and AlN - SiC - ZrB2 ceramics in air up to 1600 degreesC was studied by the methods of thermogravimetric, differential thermal, x-ray diffraction, and electron-probe microanalysis. The exceptionally high corrosion resista nce of these materials was established. The corrosion resistance and possib ility of using structural ceramics of the systems TiB2 AlN, TiB2 - TiN, and TiCo0.5N0.5 in sea water was demonstrated. The toxicity of Si3N4, AlN, BN, and TiN powders was analyzed on the basis of their reactions with biochemi cal media. It was proven that TiN based materials are highly stable in the oral cavity.