Mg matrix encapsulation materials possess the advantage of low density and high electromagnetic shielding,while the excessively high coefficient of thermal expansion limits their usage.As a new type of substrate material,AlN exhibits a higher thermal conductivity and a lower coefficient of thermal expansion(CTE)than those of magnesium alloys,which can be used as a reinforcement phase to improve the thermophysical properties of magnesium alloy.AlN/ZC55 composites were prepared by stirring casting method,and the influence of AlN content on thermophysical proper-ties of composites was explored.The results indicate that AlN particles can significantly reduce the CTE and slightly weaken the heat dissipation performance of composite.With 20%of AlN particles addition,the thermal conductivity reaches 126.2 W/(m·K)while CTE is 1.983×10-5 K-1.
关键词
镁基复合材料/热导率/热膨胀系数/AlN
Key words
Magnesium Matrix Composites/Thermal Conductivity/Coefficient of Thermal Expansion/AlN
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