| 摘要 |
A process for producing a compact silicon nitride ceramic product which comprises molding a powder mixture of Si3N4, Ta2O5 and Al2O3 in proportions defined by the region A, B, C, D in the FIGURE within the ranges of 65.0 to 96.0% by volume Si3N4, 1.0 to 32.0% by volume Ta2O5 and 3.0 to 20.0% by volume Al2O3, and then firing the powder mixture in a non-oxidizing atmosphere containing a carbon compound; or hot-pressing the powder mixture; in a graphite mold.
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