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RAW MATERIAL POWDER OF SI3N4 AND SINTERING OF SI3N4 USING THE SAME POWDER
RAW MATERIAL POWDER OF SI3N4 AND SINTERING OF SI3N4 USING THE SAME POWDER
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机译:SI3N4的原料粉末和使用相同的粉末烧结SI3N4
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摘要
PURPOSE:To form raw material powder of Si3N4 for sintering having a low residue ratio of pores on the surface layer of sintered material, thin discolored layer of surface and small variability of density, strength and hardness of sintered material by limiting the specific surface area of raw material powder of Si3N4 and an average oxygen amount thereof in specific ranges. CONSTITUTION:This raw material powder of Si3N4 has 9.5 to 11.0m2/g specific surface area of powder particles thereof and 1.00 to 1.50wt.% average oxygen amount contained in the powder particles. In order to sinter the abovementioned raw material powder of Si3N4, the following two methods are used. (1) The raw material powder of Si3N4 or powder comprising raw material powder of Si3N4 further and a sintering auxiliary is molded, presintered and the presintered material is sintered by hot isotropic hydrostatic press or (2) the raw material powder of Si3N4 or the powder comprising raw material powder of Si3N4 further and a sintering auxiliary is molded, the molded article is covered with glass capsules and sintered by hot hydrostatic press.
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机译:用途:形成烧结的Si3N4原料粉末,其在烧结材料的表面层上的孔残渣率低,表面变色层薄并且通过限制烧结材料的比表面积而使烧结材料的密度,强度和硬度的变化小。 Si 3 N 4的原料粉末及其平均氧含量在特定范围内。组成:该Si 3 N 4原料粉末的粉末颗粒的比表面积为9.5至11.0m 2 / g,粉末颗粒中平均氧含量为1.00至1.50wt。%。为了烧结上述Si 3 N 4原料粉末,使用以下两种方法。 (1)将Si 3 N 4的原料粉末或进一步包含Si 3 N 4的原料粉末和包含烧结助剂的粉末成型,预烧结,并通过热各向同性静压机对预烧结的材料进行烧结;或(2)Si 3 N 4的原料粉末或该粉末。进一步包含由Si 3 N 4的原料粉末和烧结助剂制成的模制品,该模制品用玻璃胶囊覆盖并通过热静压机烧结。
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