本文用硅粉和氮气通过高温自蔓延方法合成β-Si3N4粉末，以此为原料，采用气氛加压烧结工艺，研究了烧结助剂YAG的添加量及烧结保温时间对其性能的影响.研究结果表明，在1940℃、1.2MPaAr，保温1h的条件下，β-Si3N4粉烧结后可达到99％的理论密度，并且具有较高的断裂韧性及硬度.
β-Si3N4 inaterial prepared by self-propagating high-teinperature synthesis from silcon powder and nitrogen was studied by gas pressure sintering process. The effects of different ainounts of YAG additive and holding time on the properties were investigated. The results show that this β-Si3N4 powder can be sintered to>99% of the theoretical density with high fracture toughness under the sintering conditions of 1.2MPa Ar pressure 1940℃ and ho1ding 1 hour.
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