摘要
以某型国产汽车发动机为研究对象，设计了用于其缸体的新型铸铝铝基SiC复合材料配方，并分析了制备工艺对复合材料性能的影响规律。结果表明：当搅拌温度为730 ℃，SiC添加量为17.5%时，所制备的样品性能较佳，其抗拉强度为352 MPa，屈服强度334 MPa，断裂延伸率为0.52%，维氏硬度为1 724.8 N/mm2，线性磨损量为0.016 mm，导热系数为121 W/(m·K)。搅拌温度对复合材料强度影响显著，SiC添加量对复合材料断裂延伸率、维氏硬度值、耐磨性以及导热性能影响较大。物相组成分析结果表明，最佳样品的相组成为Al，SiC以及Si相，显微结构显示铝合金基体材料呈连续网状分布，这种显微结构有利于复合材料的力学性能提高，其良好的综合性能更适合于复杂载荷下的缸体材料。
Abstract
Based on a domestic automobile engine, a new aluminum matrix SiC composite was designed and the influence of preparation technology on the properties of composite was analyzed. The results show that 730 ℃ stirring temperature and 17.5% SiC content can obtain the best sample. The tensile strength of sample is 352 MPa, the yield strength is 334 MPa, the fracture elongation is 0.52%, the Vickers hardness is 1 724.8 N/mm2, the linear wearing capacity is 0.016 mm, and the thermal conductivity is 121 W/(m·K). The stirring temperature has a significant effect on the strength of composite, and the addition of SiC has a great effect on the fracture elongation, Vickers hardness, wear resistance and thermal conductivity. The analysis results of phase composition show that the optimal phase composition of sample is Al, SiC and Si. The microstructure shows that the aluminum alloy matrix material is distributed in a continuous network, which is beneficial to improve the mechanical properties of composite. The material has good comprehensive properties and is more suitable for cylinder block material under complex loads.
关键词
汽车发动机 /
气缸体 /
复合材料 /
力学性能 /
微观结构
Key words
automobile engine /
cylinder block /
compound material /
mechanical property /
microstructure
冯松，祖润青.
发动机缸体用铝基SiC复合材料的制备及性能研究[J]. 车用发动机. 2022, 0(6): 47-50 https://doi.org/10.3969/j.issn.1001-2222.2022.06.008
FENG Song，ZU Runqing.
Preparation and Property of Aluminum Matrix SiC Composite for Engine Cylinder Block[J]. Vehicle Engine. 2022, 0(6): 47-50 https://doi.org/10.3969/j.issn.1001-2222.2022.06.008
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