用于干气密封的热压烧结SiC/YAlO复合陶瓷的微观结构与性能

Microstructure and Properties of Hot Pressing Sintered SiC/YAlO Composite Ceramics for Dry Gas Seals.

作者信息

Zou Chang, Ou Yangxin, Zhou Weiliang, Li Zhiqiang, Zheng Pu, Guo Xingzhong

机构信息

School of Materials Science and Engineering, Zhejiang University, Hangzhou 310058, China.

ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou 311200, China.

出版信息

Materials (Basel). 2024 Mar 3;17(5):1182. doi: 10.3390/ma17051182.

DOI:10.3390/ma17051182

PMID:38473653

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10935328/

Abstract

Silicon carbide (SiC) ceramics with high bending strength were prepared by hot pressing sintering (HPS) with yttrium aluminum garnet (YAlO, YAG) as sintering additive, and the effects of YAG content and sintering temperature on the sintering behavior, microstructure and mechanical properties of SiC ceramics were investigated in detail. The uniform distribution of YAG to form a liquid phase and the driving force provided by hot pressing sintering decrease the sintering temperature, improve the densification of SiC ceramics, and refine the crystal size. By means of suitable sintering conditions with the additional amount of YAG of 5 wt%, the sintering temperature of 1950 °C and a pressure of 30 MPa, the resultant SiC/YAG composite ceramics possesses high sintering and mechanical properties with the relative density of 98.53%, the bending strength of 675 MPa, the Vickers hardness of up to 17.92 GPa, and the elastic modulus of 386 GPa. The as-prepared SiC/YAG composite ceramics are promisingly used as the dry gas seal materials in the centrifugal compressors.

摘要

以钇铝石榴石（YAlO，YAG）为烧结添加剂，通过热压烧结（HPS）制备了具有高抗弯强度的碳化硅（SiC）陶瓷，并详细研究了YAG含量和烧结温度对SiC陶瓷烧结行为、微观结构和力学性能的影响。YAG均匀分布形成液相以及热压烧结提供的驱动力降低了烧结温度，提高了SiC陶瓷的致密化程度，并细化了晶粒尺寸。通过合适的烧结条件，即YAG添加量为5 wt%、烧结温度为1950 °C、压力为30 MPa，所得的SiC/YAG复合陶瓷具有高烧结性能和力学性能，相对密度为98.53%，抗弯强度为675 MPa，维氏硬度高达17.92 GPa，弹性模量为386 GPa。所制备的SiC/YAG复合陶瓷有望用作离心压缩机中的干气密封材料。