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Abstract
The present position regarding cermets based on either oxides or carbides as the brittle phase is reviewed. The outlook for oxide systems is to some extent disappointing, since little gain in strength has been found compared with the oxide itself. Oxide cermets do, however, show an intermediate improvement in thermal shock-resistance that is useful in a number of directions. Carbide cermets appear adequate for many high-duty applications so far as thermal shock-resistance is concerned, but improvements in their resistance to mechanical shock are still necessary.
Recent work on ductile ceramics is also reviewed, and the importance of carrying out experiments at high strain rates is emphasized.
Finally, suggestions are made for further work in the field of cermets.
Notes
* A lecture delivered at a meeting of the Powder Metallurgy Joint Group in London on 16 December 1958.