期刊论文

Kuang Jiacai

中文

稀有金属材料与工程

1002-185X

2008

37

A01

236-239

10.3321/j.issn:1002-185X.2008.z1.061

国家博士后基金项目（20060400881）； 湖南省博士后基金项目（No.2006FJ4239）； 湖南省科技攻关项目（S2006C3530）；

本校为其他机构

以自蔓延高温合成(SHS)的AlN粉体为原料,以Y203-B20O-CaF2和YF3-B-CaF2系为烧结助剂,采用热压烧结工艺制备AIN陶瓷.结果表明,采用烧结助剂,在1750℃、压力为35 MPa、保温2 h的烧结条件下,可获得相对密度均98.8%、热导率为95W/(m·K)的AIN烧结体.通过对AlN试样断口的SEM分析可知:AlN晶粒大多呈直接结合,晶界相较少,有少量气孔存在.对AlN陶瓷进行后续热处理可提高其热导率,这主要是由于后续热处理后AlN陶瓷的晶界比较干净、AlN晶粒间呈直接结合而晶界相呈孤岛状分布.

AlN ceramics were fabricated by hot-pressing of AlN powders added with Y2O3-B2O3-CaF2 and YF3-B-CaF2 as sintering aids. The AlN ceramics sintered at 1750 degrees C and 35 MPa for 2 h have the relative density of 98.8% and high thermal conductivity of 95W/(m.K). In the AlN ceramics, the grains were sintered with residue pores at grain boundaries. The AlN ceramics were further heat treated which increased the thermal conductivity to 133 W/(m.K). This was due to that the heat-treatment provided pure AlN crys...