激光熔覆微-纳米碳化钨复合涂层结构与性能研究

以微米和纳米级晶粒Co包碳化钨为增强相,自熔合金粉末Ni60B为粘结剂,采用激光熔覆的方法在45钢表面制备出微-纳米碳化钨增强Ni基合金复合涂层.采用扫描电镜、X射线衍射等手段对粉末和涂层的相结构、显微组织等进行了分析观察,采用显微硬度计分析了涂层表面硬度随成分的变化规律和截面硬度的分布曲线.结果表明,纳米碳化钨粉末的添加有助于改善涂层的熔覆性能和提高涂层的表面硬度.

Microstructure and Microhardness of Laser Cladding Nickel Alloy- Matrix Composite Coating Reinforced with Micro Nano Tungsten Carbide

Nickel alloy-matrix composite coatings reinforced with micro - nano tungsten carbide were prepared on the surface of AISI1045 steel using laser cladding. The micro-structure and phase composition of the composite coatings wereanalyzed by means of scanning electron microscopy and X-ray diffraction. The surface and sectional microhardness of the composite coatings was measured using a microhardness tester. It was found that the surface microhardness of the composite coatings increased with increasing content of nano-sized WC. At the same time, the introduction of nano - sized WC contributed to greatly improving the cladding performance of the Ni alloy - matrix composite coating as well.