摘要
利用电流直加热动态热压烧结工艺,分别制备了增强颗粒体积含量从5%到15%,尺寸从3μm到45μm的SiCp/Fe复合材料,研究了粒子含量与尺寸对复合材料硬度、强度、延伸率和耐磨性能的影响.研究表明:增强颗粒的体积含量从5%提高到10%,可以明显提高材料的性能;随着增强颗粒含量进一步提高,颗粒团聚将导致材料性能降低;增大颗粒尺寸,可以改善复合材料中的粒子分布均匀性,提高材料性能;但当粒子尺寸大于临界尺寸时,较低的粒子强度将使复合材料性能降低.增强颗粒含量为10%,尺寸为13μm的SiC颗粒强化的铁基复合材料,可获得高达949 MPa的屈服强度和501HV5的硬度.
SiCp/Fe composites with SiC volume fractions from 5% to 15% and different particle sizes from 3 μm to 45 μm respectively were manufactured by the specimen current heating dynamic hot press sintering,and their effects on the properties such as Vickers hardness,strength,elongation and wear resistance were investigated.It is shown that the properties are improved significantly as the volume fraction is increased from 5% to 10% but are deteriorated as the fraction is further increased to 15% because of production of agglomeration of the SiC particles.SiC particle distribution can be improved with large particle size,so that the composite properties become better by increasing the size to 13 μm.However,the properties go down as the particle size is further increased to above the critical value because large SiC particles have low strength themselves.The SiCp/Fe composites with particle volume fraction of 10% and size of 13 μm can demonstrate a remarkably yield stress of 949 MPa and Vickers hardness of 501HV5.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2011年第1期47-51,57,共6页
Materials Science and Technology
基金
国家自然科学基金资助项目(5077102850471024)
