摘要
为解决多孔透气材料力学强度与透气性能两者之间的矛盾,以纯铝酸钙水泥为钙源,在刚玉质多孔材料中原位生成六铝酸钙相,研究了六铝酸钙生成量对多孔材料显微结构、物相组成及物理性能的影响。结果表明:在1700℃保温3 h处理后,添加纯铝酸钙水泥的试样中均有板状片六铝酸钙生成。当纯铝酸钙水泥添加量(质量分数)不超过3%时,六铝酸钙的原位生成不仅提高了多孔材料的常温耐压强度和高温抗折强度(1400℃保温0.5 h),还能改善材料的透气性能;继续增加纯铝酸钙水泥的加入量,多孔材料的上述性能降低。当纯铝酸钙水泥添加量(质量分数)为3%时,试样常温耐压强度为33.6 MPa,高温抗折强度为6.2 MPa,达西渗流系数及非达西渗流系数分别为2.54×10^-10 m^2和1.46×10^-6 m。
To balance the contradiction of mechanical strength and air permeability of porous corundum materials,the calcium hexaluminate was in-situ synthesized in the porous materials by using pure calcium aluminate cement as the calcium source.The effects of in-situ synthesized calcium hexaluminate on the microstructure,phase composition,and mechanical properties of the porous corundum materials were investigated.The results show that,the plate-like calcium hexaluminate particles can be in-situ synthesized in the specimens added with pure calcium aluminate cement after treated at 1700℃for 3 h.When the mass fraction of pure calcium aluminate cement is no more than 3%,the in-situ synthesized calcium hexaluminate not only improves the cold compressive strength and the high-temperature bending strength(1400℃×0.5 h)of the porous material,but also improves the air permeability of specimens.With further increase of pure calcium aluminate cement additions,the above properties of the specimens turn to a reversed trend.The cold compressive strength of specimen added with 3%pure calcium aluminate cement by mass is 33.6 MPa,the highest high-temperature bending strength is 6.2 MPa,and the Darcian permeability and non-Darcian permeability constant are 2.54×10^-10 m^2 and 1.46×10^-6 m,respectively.
作者
熊鑫
王周福
王玺堂
刘浩
马妍
XIONG Xin;WANG Zhou-fu;WANG Xi-tang;LIU Hao;MA Yan(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2019年第6期410-415,421,共7页
Powder Metallurgy Technology
基金
国家自然科学基金资助项目(51474166,51672195)
国家重点研发计划资助项目(2017YFB0310701)
关键词
多孔材料
原位生成
六铝酸钙
力学强度
透气性能
porous materials
in-situ synthesis
calcium hexaluminate
mechanical strength
air permeability
