研究了MgO,Al2O3和Y2O3作为烧结助剂对高温自蔓延工艺合成(SHS)的β-Si3N4粉料烧结过程的影响.结果发现,MgO是较为有效的烧结助剂,当其加入量为10wt％时,试样在1600℃下热压烧结能基本实现致密化.对试样的XRD分析表明,除了加入的Al2O3与β—Si3N4反应生成β-Sialon外,其他烧结助剂都不与β-Si3N4反应,只存在于玻璃相中.添加MgO的试样具有较高的力学性能.最后,对材料的显微形貌进行了SEM观察.
The sintering of β-Si3N4 powder synthesized by self-propagating high-temperature synthesis was studied with the addition of MgO, Al2O3, Y2O3 as sintering additives. MgO was found to
be the effective sintering aids, and β-Si3N4 could be densified at 1600℃ under 20MPa with the addition of 10wt% MgO. XRD results showed that the additives did not react with β-Si3N4,
existing in glassy phase of the sintered sample, with the exception of Al2O3, which reacted with β-Si3N4 to form β -Sialon phase. The samples with MgO added had better mechanical properties
than that of samples doped with Y2O3 and Al2O3.
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