颗粒包覆对Al_2O_3/青铜复合材料界面结合模式及性能的影响

Influence of Metallic Coatings of Al_2O_3 Particles on the InterfaceStructural Models and Properties of Al_2O_3Bronze Composite

采用化学镀的方法在Ａｌ２Ｏ３颗粒表面包覆镍或铜，研究了颗粒包覆对Ａｌ２Ｏ３／青铜复合材料界面结合模式及性能的影响。ＸＲＤ结果表明，包镍后，复合材料的界面有化学反应发生，生成Ｎｉ２Ａｌ３相，复合材料的界面结合强度因此而增加；包铜后，复合材料的界面无化学反应发生，但因机械锁合作用加强，也使复合材料的界面结合加强。颗粒包覆使复合材料的界面结合模式改善。研究表明，Ａｌ２Ｏ３颗粒表面包覆镍或铜对复合材料的致密度和力学性能（硬度。

Al_2O_3 particles were coated with nickel or copper by means of electroless plating technique in this study The influence of metallic coatings of Al_2O_3 particles on the interface structural models and properties of Al_2O_3bronze composite was studied XRD results indicated that a intermetallic compound Ni2Al3 existed at the interface of the nickelcoated Al2O3bronze composite due to a chemical reaction, thus increasing the interfacial bonding strength Coppercoated Al2O3bronze composite, without chemical reaction, also exhibited some increased interfacial bonding strength due to a tighter interlocking between matrix and coated reinforcement Furthermore, composite with coated particles had better interfacial structure than that had uncoated ones Results showed metallic coatings on the surface of Al2O3 particles could greatly affect the density, hardness, tensile strength and wear resistance of the composite