摘要
以Si粉、活性炭、预氧化的SiC颗粒为原料,于埋炭条件下经1500℃保温3h烧制后,制备出了原位自生SiC晶须复合SiC耐磨材料,并研究了SiC晶须对原料预氧化SiC耐磨材料性能的影响,并分析了这些性能和显微结构间的关系。结果表明,原位自生SiC晶须可提高SiC耐磨材料的致密度和力学性能,并在Si粉和活性炭共同添加量为12 wt.%时改善效果较佳,对应试样的抗冲击强度和硬度分别为29.91 kJ·m^(-2)和98(HRB),磨耗比为4.49。这是因为原位自生的SiC晶须充填在SiC颗粒间的孔隙中,形成了均匀的网络结构,且其伴生的SiO_(2)和SiC原料预氧化的产物SiO_(2),均可与α-Al_(2)O_(3)添加剂反应生成莫来石,增强了晶须与基体间的结合力。当SiC耐磨材料受到外力作用时,这些与基体结合较好的SiC晶须,可通过拔出、裂纹的偏转和桥联等途径改善SiC耐磨材料的力学性能。
In-situ self-generated SiC whisker reinforced SiC wear-resistant composite materials were prepared by using Si powder and activated carbon as SiC whisker precursor and pre-oxidized SiC particles as raw materials,which were sintered under charcoal-buried conditions at 1500℃for 3 h.Effect of the SiC whiskers on properties of the pre-oxidized SiC wear resistant materials was studied,while the relationship between properties and microstructure was analyzed.With the incorporation of the in-situ self-generated SiC whiskers,densification and mechanical properties of the SiC wear resistant materials were improved.It is found that the improvement effect is maximized when the addition of Si powder and activated carbon is 12 wt.%.Correspondingly,impact strength,hardness and wear ratio of the sample are 29.91 kJ·m^(−2),98(HRB)and 4.49,respectively.The in-situ self-generated SiC whiskers fill the pores between SiC particles,forming a uniform and dense network structure.SiO_(2)from the associated and pre-oxidized SiC raw materials reacted withα-Al_(2)O_(3)to produce mullite,which enhanced the binding force between the whiskers and matrixes.When the SiC wear-resistant materials were subjected to external forces,SiC whiskers with good bonding with the matrix resulted in enhanced mechanical properties through extraction,crack deflection and bridging connection.
作者
郭会师
赵志强
李文凤
高朝阳
贾晓东
刘应凡
陈凤华
桂阳海
GUO Huishi;ZHAO Zhiqiang;LI Wenfeng;GAO Chaoyang;JIA Xiaodong;LIU Yingfan;CHEN Fenghua;GUI Yanghai(School of Material and Chemical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450001,Henan,China;School of Material Science and Engineering,Henan University of Technology,Zhengzhou 450001,Henan,China)
出处
《陶瓷学报》
CAS
北大核心
2024年第2期332-337,共6页
Journal of Ceramics
基金
国家自然科学基金(51802290)
河南省重点科技攻关项目(232102231046,232102231051,232102240070,222102240058)
河南工业大学青年骨干教师培育计划项目(21421211)。
关键词
SIC晶须
预氧化
原位自生
SiC耐磨材料
力学性能
显微结构
SiC whiskers
pre-oxidation
in-situ self-generated
SiC wear resistant material
mechanical properties
microstructure
