堆焊工艺制备金属间化合物复合材料的组织和性能

Microstructure and properties of intermetallic composites fabricated by surdfacing

摘要: 以WC,NiAl,NiB和Ni粉末等混合球磨、烧结制备复合材料焊条,在球磨过程中,WC颗粒被破碎,NiAl,NiB和Ni反应生成金属间化合物Ni₃Al。用氩弧焊将这种复合材料焊条堆焊在1Cr25Ni20Si2不锈钢的表面,形成5mm厚的金属间化合物耐磨复合材料。堆焊过程中,部分WC溶解,析出新碳化物M₂C,Ni₃Al转变成新金属间化合物Ni₃(AlTi)C。这种复合材料的耐磨性可达45钢的3倍以上。

Abstract: Composite welding rods were fabricated by milling and sintering mixtures of WC,NiAl,NiB and Ni powders.In milling,WC particles were broken,and NiAl,NiB and Ni powders reacted to form intermetallic compounds.WC/intermeatllic composite wear resistant coatings (5mm in thickness) were made using this kind of welding rods on the surfaces of 1Cr25Ni20Si2 steel.Partial WC particles dissolved to precipitate new carbide W₂C,and the matrix Ni₃Al transformed one new intermetallic compound Ni₃(AlTi) C.The wear resistance of this composites was 3 times that of 45 steel.