工程科学学报2017，Vol.39Issue(2)：238-243,6.DOI:10.13374/j.issn2095-9389.2017.02.011
超声外场对SiCp/7085复合材料颗粒微观团聚与界面结合的作用机理
Mechanism of ultrasonic field on the particle micro-agglomeration and interfacial bonding of SiCp/7085 composites
摘要
Abstract
SiCp/7085 composites with 10% particle volume fraction was prepared by a semi-solid mixture- mechanical stirring-ultrasound vibrations method. The particle distribution and interface bonding were studied through optical microscopy ( OM) , scanning electron microscopy ( SEM) and X-ray diffraction ( XRD) , and the effect of ultrasonic field on the particle agglomeration and interfa-cial bonding of the composites was studied emphatically. The experimental results indicate that the effect of mechanical stirring on the agglomeration and interfacial bonding of 400 mesh particles is not significant. Under ultrasonic field, the coating of particles agglomer-ation can be effectively get rid of by instantaneous high pressure and temperature and micro jet induced by cavitation. That ultrasonic gets rid of the oxide film on the particle surface, removes the gas layer and makes magnesium in melt contact with particles directly is a very important factor in improving wettability between melt and particles. Finally, the MgAl2O4 strengthening phase is formed at the interface and a better interface bonding is got.关键词
颗粒增强复合材料/超声外场/铝合金/碳化硅/颗粒团聚/界面Key words
particle reinforced composites/ultrasonic field/aluminum alloys/silicon carbide/particle agglomeration/interface分类
矿业与冶金引用本文复制引用
王坤,张立华,黎正华,蒋文,李畅梓..超声外场对SiCp/7085复合材料颗粒微观团聚与界面结合的作用机理[J].工程科学学报,2017,39(2):238-243,6.基金项目
国家自然科学基金资助项目(51475480, 51575539) （51475480, 51575539）
中南大学研究生自主创新资助项目(2016zzts308) （2016zzts308）
