TiO2添加量对SiC多孔陶瓷物相组成及性能的影响
Influence of TiO2 addition on phase composition and properties of porous SiC ceramics
邓承继 1贺锋 2梁一鸣 2李季 2高超 2慕孟2
作者信息
- 1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室 湖北武汉 430081
- 2. 军事科学院国防工程研究院 北京 100039
- 折叠
摘要
为制备同时具有高气孔率和高强度的硅结合SiC多孔陶瓷,以α-SiC粉、单质Si粉及TiO2粉为主要原料,在氩气气氛下经1 400 ℃保温3 h制备SiC多孔陶瓷,探究TiO2添加量(加入质量分数分别为0、2％、4％、8％)对材料物相组成、显微形貌、孔径分布及主要物理性能的影响.结果表明:随TiO2添加量的增加,单质Si的衍射峰逐渐消失,材料中检测到Ti3O5及TiSi2物相,伴随着新相的生成,SiC颗粒间结合更加紧密,其显气孔率及平均孔径减小,力学性能显著提升.当TiO2添加量为8％(w)时,材料具有优异的综合性能,其显气孔率、常温抗折强度及平均孔径分别为33.6％、29.6 MPa和0.27 μm.
Abstract
To achieve high porosity and strength,porous SiC ceramics were fabricated by utilizing α-SiC powder,Si powder and TiO2 powder as starting materials and firing at 1 400 ℃ for 3 h in an argon atmos-phere.The influence of the TiO2 addition(0,2％,4％and 8％,by mass)on the phase composition,micro-morphology,pore size distribution and main physical properties of the materials was studied.The results show that as the TiO2 addition increases,the diffraction peak of Si gradually diminishes,while Ti3O5 and TiSi2 are detected in the materials.With the formation of these new phases,SiC particles are bonded more tightly,resulting in reduced apparent porosity and average pore size along with significantly improved me-chanical properties.When the TiO2 addition is 8％,exceptional comprehensive properties of the material are achieved in terms of the apparent porosity of 33.6％,cold modulus of rupture of 29.6 MPa and average pore size of 0.27 μm.
关键词
多孔SiC陶瓷/TiO2/孔径分布/物相组成/力学性能Key words
porous silicon carbide ceramics/titanium dioxide/pore size distribution/phase composition/me-chanical properties引用本文复制引用
基金项目
军内装备综合研究项目(JK20202A050023)
出版年
2024
NETL
NSTL
万方数据