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通过对ZL114A熔体在不同特性涂层表面的润湿角和对应铸件表面粗糙度的测量,利用润湿性模型分析了涂层中骨料材料自由能和粒度对铸件表面粗糙度的影响。结果表明,涂层表面材料自由能越低,铝合金熔体在涂层表面上润湿性越差,铸件表面粗糙度(Ra)值越低。铝合金熔体与表面自由能低的滑石粉涂层之间的润湿性随滑石粉粒度的逐渐减小呈先减小后增大的趋势,对应铸件试样表面粗糙度呈先减小后增大趋势。滑石粉粒度为43μm时,涂层和铝合金熔体间润湿角达到155°,铸件表面粗糙度(Ra)值为0.5847μm。
The influence of the free energy and particle size of the aggregate material on the surface roughness of the castings was analyzed by the wettability model by measuring the wetting angle of the ZL114A melt and the surface roughness of the corresponding castings. The results show that the lower the free energy of the coating surface material, the poorer the wettability of the aluminum alloy melt on the coating surface, the lower the surface roughness (Ra) value of the casting. The wettability between the melt of aluminum alloy and the talc coating with low surface free energy decreases with the decreasing of talc particle size first and then increases. The surface roughness of the corresponding casting sample first decreases Increase the trend. When the talc particle size is 43μm, the wetting angle between the coating and the aluminum alloy melt reaches 155 °, and the surface roughness (Ra) of the casting is 0.5847μm.