h-BN/YSZ复合陶瓷材料的制备和导热性能研究

Preparation and Thermal Performance of h-BN/YSZ Composites

以放电等离子体烧结工艺(SPS)制备出较为致密的h-BN/YSZ复合陶瓷,通过改变烧结工艺参数控制h-BN在YSZ基体中形成不同程度的取向分布,利用X射线衍射(XRD)表征了样品的织构,并通过扫描电镜(SEM)观察到相符合的微观结构。测量样品从室温到1000℃的热导率,探究其取向程度与热导率之间的关系。结果表明,掺杂了15%h-BN(质量分数)的YSZ陶瓷材料热导率在1000℃下约为4.5~6.0 W·m-1·K-1,且层片状的h-BN第二相越是趋于平行于样品表面分布,样品的热导率值就越低。

The h-BN and YSZ double phase ceramics were prepared by spark plasma sintering. Through controlling different parameters of SPS, we got different degrees of texture of h-BN in the YSZ matrix. Besides, the thermal conductivity was tested by a laser flash method, and then the thermal conductivity was obtained, which turns out to be 4.5~6.0 W·m^(-1)·K^(-1) at 1000 °C. Through comparison, we finally found that the more h-BN paralleled to the surface, the lower thermal conductivity will be obtained.