| 摘要 |
A sintered silicon nitride product is made having a high flexural strength by sintering a mixture of silicon nitride and a sintering aid containing alumina and at least a three component rare earth oxide mixture which does not contain yttria. Based on the weight of the final sintered nitride product, the three component rare earth oxide mixture comprises about 3 to 6% La2O3, 2 to 5% Nd2O3, and 1 to 4 CeO2. An additional fourth component, Pr6O11, can be added in an amount of 0.5 to 1.1%.
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