热压制备TiC,/SiC复合材料的微观结构及力学性能

打开文本图片集

中图分类号：TB383 文献标志码：A 文章编号：1673-3851（2025）11-0743-10

引文格式：，等，热压制备 TiCx /SiC复合材料的微观结构及力学性能[J]．浙江理工大学学报（自然科学），2025，53（6）：743-752.

Reference Format：LU Liuming， DONG Qi，CHEN Yunfu，et al. Microstructure and mechanical properties of TiC /SiC composites prepared by hot pressing[J]. Journal of Zhejiang Sci-Tech University，2025，53（6）：743-752.

Microstructure and mechanical properties of TiCx/SiC composites prepared by hot pressing

LU Liuming1 ，DONG Qi2 ，CHEN Yunfu1 ，LI Haolin1 （1. School of Materials Science & Engineering， Zhejiang Sci-Tech University，Hangzhou 31OO18，China; 2. College of Education， Zhejiang University of Technology，Hangzhou 310ol4，China）

Abstract： To enhance the strength and toughness of SiC ceramics，the ternary-layered Ti3AlC2 ceramic particles，used as the precursor，were mixed with SiC powder to in-situ introduce a second-phase ceramic reinforcement TiCx featuring a special structure， size，and interface wetting by hot pressing sintering. This work mainly focuses on exploring the effects of sintering temperatures （ranging from 1550°C to 1950 ∘C ） on the density，phases，microstructures and mechanical behavior of as-synthesized composites，aiming to optimize preparation processes and screen TiCx /SiC composites with optimal microstructure and mechanical performance. The results show that the sample obtained at 1850° exhibits the bestperforming mechanical behavior，with its flexural strength，fracture toughness，and Vickers hardness reaching up to 575.67MPa ， 8.83MPa.m1/2 and 28.59GPa ， respectively. The sintering mechanism and toughening mechanisms of the composites are closely related to various factors， including the decomposition behavior of the unique structure of Ti3AlC2 at different temperatures， the dispersion of in-situ generated TiCx ，as well as the diffusion， transformation，and escape of elemental Al. The study has reference and guiding significance for improving the solid-phase sintering methods of ceramics and their composites and broadening the engineering applications of SiC materials.

Key words： SiC ceramics; in situ TiCx ； sintering temperature; mechanical properties; sintering mechanism

0 引言

碳化硅（SiC）是最具代表性的先进陶瓷材料之一，具有高强度、高硬度、抗氧化、耐腐蚀和耐高温等诸多特性，在耐磨轴承、硬质切削、刹车制动等关键部件，以及航空航天、核能工程等高精尖领域具有广阔的应用前景[1-4]。（剩余15897字）