| 摘要 |
Composite refractory contg. less than 12% porosity comprises refractory matrix and 1-40 vol.% ceramic agglomerates of strongly bonded microcrystals which are thermally anisotropic and are small enough not to crack spontaneously when cooled from 1600 deg. C to room temp.; matrix and ceramic are mutually inert. Dispersed phase is pref. 5.6 vol.% of refractory. Matrix is pref. oxide ceramic with particle size 0.1-5 and esp. 1 micron, and is mainly free of glass phase. Prepn. is from mixt. of powders and fugitive binder, which is granulated and die-pressed into billets which are isostatically pressed and sintered at 1200-1800 deg.C for 0-5 and pref. 1 hr.
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