| 摘要 |
<p>Si3N4 polycrystalline ceramic bodies formed from starting materials containing about 2 to 4 weight percent SiO2, less than 0.1 weight percent cation impurities and Y2O3 in critical amounts exhibit optimum oxidation resistance. Such bodies are useful as engine parts or components or as regenerator structures for waste heat recovery. D-20,736(21,296)</p> |
