硅酸盐学报

低温放电等离子烧结法制备氮化硅陶瓷

作者：李家亮1 牛金叶1 陈斐2

单位：1. 山东理工大学化工学院淄博山东 255049 2. 武汉理工大学特种功能材料技术教育部重点实验室武汉 430070

分类号：TQ174

出版年,卷(期):页码：2011,39(2):246-250

DOI：

摘要：

分别以MgO-Al2O3或MgO-AlPO4作为烧结助剂，采用放电等离子体低温快速烧结方法制备了主相为α相的Si3N4陶瓷材料。采用X射线衍射和扫描电子显微镜分析了样品的物相组成和显微结构；研究了烧结助剂及其含量、烧结温度对陶瓷样品的相对密度与力学性能的影响。结果表明：当采用4%(质量分数，下同)MgO-4%Al2O3烧结助剂时，1 400 ℃烧结的陶瓷样品的相对密度和弯曲强度达到最高，分别为81%和182 MPa，且随烧结助剂中Al2O3含量的增加，样品的相对密度和弯曲强度降低。而当采用4%MgO-16%AlPO4烧结助剂时，1 300 ℃烧结的陶瓷样品的相对密度和弯曲强度分别达到96%和366.5 MPa，且样品的相对密度和弯曲强度随烧结温度的升高而增大。表明MgO-AlPO4可以用作Si3N4低温烧结的一种有效烧结助剂，可降低陶瓷的烧结温度和提高其力学强度。

The α-Si3N4 matrix ceramics were prepared by spark plasma sintering using MgO-Al2O3 and MgO-AlPO4 as the sintering additives, respectively. The phase composition and microstructure of the samples were analyzed by X-ray diffraction and scanning electron microscope. The effects of sintering additives and sintering temperature on the relative density and mechanical properties of the samples were investigated. The results show that when 4% (in mass, the same below) MgO-4%Al2O3 were used as the sintering additives, the relative density and bending strength of the sample sintered at 1 400 ℃ reach 81% and 182 MPa, respectively, and the relative density and bending strength of the samples reduce with the increase of Al2O3 content in the sintering additive. When 4%MgO-16%AlPO4 were used as the sintering additives, the relative density and bending strength of the sample sintered at 1 300 ℃ reach 96% and 366.5 MPa, respectively, and the relative density and bending strength of the samples increase with the rise of sintering temperature. It indicates that the MgO-AlPO4 as sintering additives play a significant role in the low temperature sintering of Si3N4 ceramics, and not only reduce the sintering temperature but also improve the mechanical property of the sintered Si3N4 ceramics.

基金项目：

中国高校基本科研业务费专项资金资助项目。

作者简介：

副教授

参考文献：

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