摘要
以F220、F500、F600这3种粒度的磨料级绿SiC混合粉为原料制成预制件,然后将其分别在500、1 100和1 200℃煅烧后无压熔渗液态铝合金制备SiC体积分数为62%~64%的铝基复合材料SiCp/Al;研究预制件煅烧温度对SiCp/Al复合材料结构和性能的影响。结果表明：不同温度下煅烧的SiC预制件渗铝后,都能获得结构均匀致密的复合材料;高温煅烧使SiC颗粒氧化形成骨架,导致强度从305 MPa降至285~245 MPa;SiC颗粒表面氧化转变成的SiO2薄膜增加复合材料中的陶瓷含量,使复合材料的热膨胀系数进一步降低;当SiC预制件中SiO2薄膜质量分数达到3.7%~6.7%时,SiCp/Al复合材料界面热阻增大4~6倍,复合材料热导率从184 W/（m.℃）降至139~127 W/（m.℃）。
The SiC performs were prepared by green SiC powder containing three kinds of particle size of F220,F500 and F600,and by aluminum matrix composites reinforced by SiC powder（volume fraction of 62%-64%） were produced by the pressureless infiltration of liquid aluminum alloy into the SiC performs which were calcined at 500,1 100 and 1 200 ℃,respectively.The effects of calcination temperature on the structure and properties of SiCp/Al composites were investigated.The results show that SiCp/Al composites are all uniform and impact as SiC preforms calcined at different temperatures.When sintered at high temperature,SiC particles are oxidized to form skeleton which leads the bending strength of SiCp/Al composites decreasing from 305 MPa to 285-245 MPa.The SiO2 film transformed from SiC by oxidation promotes the ceramic content in the composites,which results in further decrease of the thermal expansion coefficient of SiCp/Al composites.The interface thermal resistance of SiCp/Al composites increases by 4-6 times due to 3.7%-6.7%（mass ratio） SiO2 film in the SiC preforms,and the thermal conductivity of SiCp/Al composites decreases from 184 W/（m·℃） to 139-127 W/（m·℃）.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2011年第8期1869-1874,共6页
The Chinese Journal of Nonferrous Metals
基金
安徽省自然科学基金资助项目(090414187)
