Preparation and Performance of Gradient WC Reinforced NiCrBSi Alloy Coating Based on Flexible Metallic Cloth Technique
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摘要: 采用折叠辊压技术制备NiCrBSi合金粉和WC合金粉体积比i分别为1∶1，2∶1，5∶1，10∶1，20∶1的WC合金增强NiCrBSi合金柔性金属布，将i为20∶1的金属布置于316L不锈钢基体上，再叠放一层其他体积比的金属布，采用真空钎焊制备得到4种梯度WC增强NiCrBSi合金涂层，研究了涂层中WC颗粒的分布以及涂层的耐磨性和拉伸性能。结果表明：当金属布厚度在0.5 mm、钎焊保温时间为10 min时成功制得梯度涂层，随着上层金属布中i的增大，涂层中WC颗粒分布的梯度斜率降低；梯度涂层明显提高了基体的耐磨性，且随着梯度斜率的增加，涂层的耐磨性逐渐增强，抗拉强度降低，在拉伸过程中，梯度斜率较大的涂层中会产生多条贯穿裂纹。
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关键词:
- 梯度 /
- WC增强NiCrBSi合金 /
- 钎焊 /
- 摩擦磨损 /
- 金属布
Abstract: WC-reinforced NiCrBSi alloy flexible metal cloth containing NiCrBSi alloy powder and WC alloy powder with volume ratios i of 1:1, 2:1, 5:1, 10:1 and 20:1 was prepared by the folding roller press technique. The metal cloth with i equal to 20:1 was placed on a 316L stainless steel substrate, and stacked with another layer of metal cloth with other i values, and then four gradient WC reinforced NiCrBSi alloy coatings were obtained by vacuum brazing. The distribution of WC particles in the coatings and the wear resistance and tensile properties of the coatings were studied. The results show that the gradient coatings were prepared successfully by controlling the thickness of metal cloth at 0.5 mm and brazing holding time of 10 min. The gradient slope characterizing the distribution of WC particles in coatings decreased with increasing i in the upper metal cloth. The gradient coatings improved the wear resistance of the substrate obviously. The wear resistance of the coating increased while the tensile strength decreased with increasing gradient slope. During the tensile process, multiple penetration cracks were produced in the coating with a relatively large gradient slope.-
Keywords:
- gradient /
- WC-reinforced NiCrBSi alloy /
- brazing /
- friction and wear /
- metal cloth
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