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。
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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