摘要
采用粉末冶金工艺制备车制动用30%SiCp/6082Al(体积分数)复合材料,研究了烧结温度对复合材料显微组织与性能的影响。结果表明:30%SiCp/6082Al复合材料基体中分布着均匀的SiC颗粒,Si含量随烧结温度升高而增大,烧结后复合材料中形成了Si、Mg2Si、SiO2等多种反应产物。随烧结温度增加,复合材料的密度先增大后减小,700℃烧结后复合材料的抗弯强度最大,为364 MPa。650℃烧结得到的复合材料断面区域存在许多形状各异的微小气孔,大部分SiC颗粒表现为解理断裂特征;随烧结温度逐渐升高,孔隙数量不断降低并逐渐转化为更均匀的球形结构,SiC颗粒基本都出现了解理断裂。
The 30%SiCp/6082 Al(volume percent)composite for vehicle braking was prepared by powder metallurgy technology.The effect of sintering temperature on the microstructure and properties of the composite was studied.The results show that uniform SiC particles are distributed in the matrix of 30%SiCp/6082 Al composite material,and the Si content increases with the increase of sintering temperature.After sintering,various reaction products such as Si,Mg2Si,SiO2,etc.are formed in the composite material.With the increase of sintering temperature,the density of the composite material increases firstly and then decreases.After sintering at 700℃,the bending strength of the composite material reaches the highest value of 364 MPa.There are many tiny pores with different shapes in the cross-sectional area of the composites sintered at 650℃,and most SiC particles show cleavage fracture characteristics.As the sintering temperature increases,the number of pores decreases and gradually changes into a more uniform spherical structure,and nearly all SiC particles show cleavage fracture characteristics.
作者
邱翠榕
QIU Cui-rong(Automotive Engineering Institute,Wuhan Vocational College of Software and Engineering,Wuhan 430205,China)
出处
《粉末冶金工业》
CAS
北大核心
2019年第4期38-41,共4页
Powder Metallurgy Industry
基金
2015湖北省职业教育学会项目(ZJGB201543)
