使用自行设计的WC颗粒增强镍基合金粉末, 在煤矿用刮板运输机中部槽上成功制备了Ni50＋WC激光熔覆层, 并对其裂纹敏感性和耐磨损性能进行了测试分析。研究表明, 当合金粉末组成为35% Ni50＋65% WC时, 熔覆层表面及截面组织均不存在明显裂纹, 其开裂敏感性仅为5 mm/cm2; 摩擦磨损实验中, 磨损1 h时熔覆层的磨损失重仅为0.1 mg, 分别是1# 粉末70% Ni50＋30% WC熔覆层与Fe90熔覆层的1/2和1/6。工业应用表明, 相比于传统熔覆材料, 使用35% Ni50＋65% WC粉末制备出的熔覆层耐磨性能更优异、使用寿命更长久。

A kind of WC particle reinforced Ni-based alloy powder for laser cladding was self-designed and the Ni50＋WC laser cladding layer was successfully prepared in the middle chute of the coal scraper conveyor, and the crack sensitivity and wear resistance were tested and analyzed. The results show that when the alloy powder composition is 35% Ni50＋65% WC, there are no obvious cracks on the surface and cross-section of the cladding layer, and the cracking sensitivity is only 5 mm/cm2. In the friction and wear experiments, the wear loss of the cladding layer is only 0.1 mg at 1 h, which is one-half and one-sixth of that of the cladding layer of 1# powder 70% Ni50＋30% WC and Fe90 cladding layer, respectively. Industrial applications show that compared with conventional cladding materials, using 35% Ni50＋65% WC powder can prepare cladding layer with superior wear resistance and longer service life.