The nitrogen and oxygen in sintered block Si 3N 4 can not release so completely as the powder sample at the same heating and extracting condition.

粉末压型烧结氮化硅样中氮和氧难以完全释放，其主要原因为烧结氮化硅样与粉末氮化硅样释放动力学条件不同。

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The results show that the smaller the particle size of tungsten powders, the lower the density and the smaller the grain size of the sintered tungsten block.

结果表明，初始钨粉粒径越小，制备得到钨块的密度越小，晶粒平均直径也越小；

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The results show that the smaller the particle size of tungsten powders, the lower the density and the smaller the grain size of the sintered tungsten block.

结果表明，初始钨粉粒径越小，制备得到钨块的密度越小，晶粒平均直径也越小；

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