AZ91合金发动机缸体表面熔覆与涂层性能研究

发布时间：2018-06-26 02:35

本文选题：AZ合金 + 表面改性　；参考：《特种铸造及有色合金》2016年04期

【摘要】：对AZ91镁合金发动机缸体进行了表面等离子熔覆改性处理,对比分析了AZ91合金基材、TiB_2-Al_2O_3和3种不同比例的Al与TiB_2-Al_2O_3复合改性层的显微组织和物相组成,并对改性层的硬度、耐磨性和耐腐蚀性能进行了研究。结果表明,随着距离改性层表面距离的增加,显微硬度呈现逐渐降低的趋势,但改性层的显微硬度都高于AZ91合金基体,而TiB_2-Al_2O_3改性层的显微硬度最高。随着熔覆材料中Al含量的增加,改性层显微硬度逐渐降低;随着磨损时间延长,基材与不同改性层的磨损质量损失都逐渐增加。3种不同配比的Al与TiB_2-Al_2O_3复合改性层中w(Al)∶w(TiB_2-Al_2O_3)=1∶2改性层的耐磨性能最好;经过等离子熔覆复合改性处理后的发动机缸体的耐腐蚀性能有所提高,其中,w(Al)∶w(TiB_2-Al_2O_3)=1∶2时改性层的耐腐蚀性能最好。
[Abstract]:The surface plasma cladding modification of AZ91 magnesium alloy engine cylinder block was carried out. The microstructure and phase composition of the AZ91 alloy base material TiB _ 2-Al _ 2O _ 3 and three different proportions of Al and TiB _ 2-Al _ 2O _ 3 modified layer were compared and analyzed, and the hardness of the modified layer was also analyzed. Wear resistance and corrosion resistance were studied. The results show that the microhardness of the modified layer decreases gradually with the increase of the distance from the surface of the modified layer, but the microhardness of the modified layer is higher than that of the AZ91 alloy matrix. With the increase of Al content in the cladding material, the microhardness of the modified layer decreases gradually, and the wear time increases, The wear quality loss of the base material and the different modified layers increased gradually. 3 kinds of Al and TiB _ 2-Al _ 2O _ 3 composite modified layers with different ratios had the best wear resistance in the w (Al): W (TiB _ 2-Al _ 2O _ 3) / 1: 2 modified layer; The corrosion resistance of the engine cylinder treated by plasma cladding has been improved, and the corrosion resistance of the modified layer is the best when the modified layer is w / (Al) / w (TiB / S _ 2-Al _ 2O _ 3) / 1: 2.
【作者单位】：柳州职业技术学院汽车工程系;桂林电子科技大学;
【基金】：柳州职业技术学院科技创新计划资助项目(2015KJCX-018)
【分类号】：TG178;TK406

【相似文献】