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TiO_(2)粉为主要原料,在氩气气氛下经1400℃保温3 h制备SiC多孔陶瓷,探究TiO_(2)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TiO_(2)添加量的增加,单质Si的衍射峰逐渐消失,材料中检测到Ti_(3)O_(5)及TiSi_(2)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TiO_(2)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0.27μm。
To achieve high porosity and strength,porous SiC ceramics were fabricated by utilizingα-SiC powder,Si powder and TiO_(2)powder as starting materials and firing at 1400℃for 3 h in an argon atmosphere.The influence of the TiO_(2)addition(0,2%,4%and 8%,by mass)on the phase composition,micromorphology,pore size distribution and main physical properties of the materials was studied.The results show that as the TiO_(2)addition increases,the diffraction peak of Si gradually diminishes,while Ti 3O 5 and TiSi 2 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 mechanical properties.When the TiO_(2)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 0.27μm.
作者
邓承继
贺锋
梁一鸣
李季
高超
慕孟
Deng Chengji;He Feng;Liang Yiming;Li Ji;Gao Chao;Mu Meng(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;不详)
出处
《耐火材料》
CAS
北大核心
2024年第2期93-98,共6页
Refractories
基金
军内装备综合研究项目(JK20202A050023)资助
关键词
多孔SiC陶瓷
TiO_(2)
孔径分布
物相组成
力学性能
porous silicon carbide ceramics
titanium dioxide
pore size distribution
phase composition
mechanical properties
