| 摘要 |
<p>A method for the pressureless sintering of whisker reinforced ceramic bodies. Mixtures containing silicon carbide whiskers and finely divided ceramic matrix powders are formed in which the whisker content is in the range of 0.5-21 volume percent of the mixture. The mixture is then compacted without external heating to form a shaped body having a density of 55-70% of the density of the desired final sintered product. The green body so formed is then sintered at pressureless sintering conditions in a non-oxidizing atmosphere to form a high density, high toughness reinforced ceramic body. In one embodiment, the green body is sintered at pressureless sintering conditions to form a closed porosity ceramic body, which is then subjected to containerless hot isostatic pressing to increase its density to at least about 98% of the theoretical maximum density of the body.</p> |
