AA7075铝合金表面激光熔覆Zr基复合涂层的组织与磨损行为

Microstrucmre and wear behaviour of laser cladding Zr-based composite coatings on AA7075 aluminum alloy

为了提高铝合金的磨损性能,采用激光熔覆技术在AA7075铝合金表面熔覆了Zr-Cu-Ni-Al-TiC复合粉末,制备出Zr基复合涂层。采用SEM和XRD技术研究了熔覆层的组织；采用干滑动磨损方法评价了涂层的耐磨性。研究结果表明：熔覆层组织主要由非晶和金属间化合物组成。在非晶相和金属间化合物复合作用下,熔覆层表现出优异的耐磨性,尤其是随着熔覆层中TiC含量的增加,耐磨性得到显著的提高。

To improve the wear property of aluminum alloy, wear - resistant Zr - based composite coatings can be fabricated on AA7075 aluminum alloy by laser cladding using mixed powders Zr - Cu - Ni - Al - TiC. The microstructure of the coatings was characterized by scanning electron microscopy （SEM） and X - ray diffraction （ XBD ）. The wear resistance of the coatings was evaluated under dry sliding wear test condition at room temperature. Owing to recombination action of amorphous and intermetallic compounds, the coatings exhibited excellent wear resistance, especially for the increase of TiC.