ZHANG Liqiang¹, LIN Shili¹, CHEN Zhaoke², ZHOU Feng¹

(1.College of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha 410004, China;2.State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)

Abstract：Camellia oleifera shell, silica powder and phenolic resin were adopted as raw materials to prepare camellia oleifera shell-based SiC ceramics by hot-press forming and high temperature in-situ reaction sintering process.Thermogravimetric-differential scanning calorimetry(TG-DSC)analysis was applied to study the cracking behavior of camellia oil shell powder and phenolic resin.X-ray diffractometer, scanning electron microscope three-point bending method and Archimedes drainage method were used to characterize phase composition and microstructure of the SiC ceramics, and analyse compressive strength and porosity of the SiC ceramics, based on the above results to study the effect of Si content on phase composition, microstructure, compressive strength and porosity of SiC ceramics.Experimental results show that the camellia oleifera shell-based SiC ceramics are composed of the main crystalline phase β-SiC and free Si and have a well pore structure where the pore is honeycomb and uniform in size.The camellia oleifera shell-based SiC ceramics have high porosity(>50%)and good compressive strength(12～18 MPa).With the increasing of Si content, the porosity and the compressive strength of the camellia oleifera shell-based SiC ceramics increase first and then decrease.These results indicates that the camellia oleifera shell-based SiC ceramics has a promising development in the fields of hot gas filtration.

Keywords：SiC ceramics; camellia oleifera shell; compressive strength; porosity; microstructure

Received：2022-09-14，Revised：2022-10-25,Online：2023-01-31 16:18。

Funding Project：长沙市自然科学基金项目，编号：kq2202288。

First Author：张立强(1978—)，男，教授，博士，硕士生导师，研究方向为材料的成型与应用。E-mail: 21384881@qq.com。

Corresponding Author：陈招科(1979—)，男，研究员，博士，博士生导师，研究方向为超高温陶瓷基复合材料。E-mail: 18390625464@163.com。