摘要
自润滑铝基复合材料有着密度小、比强度高、导电导热性好、热膨胀系数低、价格便宜等诸多优点。因此在航空航天、国防军工以及诸多民用领域都有着广阔的应用前景。在对Al-MnS复合材料的研究过程中,发现MnS与铝基体的界面存在润湿性较差的问题。因此,为了解决MnS颗粒与铝基体之间的界面结合问题,基于Mg元素在铝基体中具有较高的固溶度,在Al-MnS复合材料中加入Mg元素,采用粉末冶金方法制备Al-Mg-MnS复合材料。讨论了不同Mg元素含量对复合材料微观组织、力电性能、摩擦磨损性能的影响,并对润滑机理进行分析。结果表明:烧结过程中,Mg元素能显著改善复合材料的界面结合强度,进一步提高了复合材料的耐磨性能;当Mg元素含量为5%时复合材料的综合性能最优,抗拉强度为338 MPa,延伸率为10.9%;少量Mg元素的加入并不影响材料的导电率,可以获得综合性能优异的Al-Mg-MnS复合材料。
Self-lubricating aluminum matrix composites have many advantages such as low density,high specific strength,good electrical and thermal conductivity,low thermal expansion coefficient and low cost.Therefore,they have broad application prospects in aerospace,national defense and many civilian fields.In the process of the study of aluminum-manganese sulfide composites,it was found that the interface between manganese sulfide and aluminum matrix had poor wettability.Therefore,in order to solve the interface bonding problem between the manganese sulfide particles and the aluminum matrix,the factor that Mg has a high solid solubility in the aluminum matrix was considered.Mg was added to the aluminum-manganese sulfide composite,then Al-Mg-MnS composites were prepared using powder metallurgy.The effects of different Mg contents on the microstructure,electro-mechanical properties,friction and wear properties of the composites were discussed,and then the lubrication mechanism was analyzed.The results show that during the sintering process,magnesium significantly improve the interfacial bonding strength of the composites and improve the wear resistance of the composites;When the content of Mg is 5%,the composite exhibits the best comprehensive properties,with a tensile strength of 338 MPa and an elongation of 10.9%;The addition of a small amount of magnesium does not affect the conductivity of the material,and Al-Mg-MnS composites with excellent comprehensive properties can be obtained.
作者
李杨
郑贺矾
郭家豪
陈存广
刘新华
LI Yang;ZHENG Hefan;GUO Jiahao;CHEN Cunguang;LIU Xinhua(Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Shunde Innovation School,University of Science and Technology Beijing,Foshan 528399,China;Key Laboratory for Advanced Materials Processing(MOE),University of Science and Technology Beijing,Beijing 100083,China)
出处
《有色金属工程》
CAS
北大核心
2024年第11期14-23,共10页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(52271020,92266301,92066205)。
关键词
铝基自润滑复合材料
微观结构
摩擦磨损
self-lubricating aluminum matrix composites
microstructure
friction and wear
