【摘要】 将NiCrBSi粉末、碳化钨粉末及粘结剂按比例混合后,通过研磨、球磨和辊压制备出柔性镍基碳化钨金属布。柔性金属布被裁剪成适当尺寸,包覆于Q235低碳钢表面,并借助真空钎焊技术制备了镍基碳化钨耐磨涂层。研究了不同碳化钨含量（30%～70%,质量分数）对剪切强度、涂层硬度和耐磨性的影响。结果表明:碳化钨含量从30%提高至70%时,涂层的剪切强度从486.6 MPa显著下降至8 MPa。由于碳化钨含量为60%和70%的镍基碳化钨涂层与钢基体之间的冶金结合力太低,无实际应用价值,因此分析碳化钨含量从30%提升到50%的镍基碳化钨涂层硬度及耐磨性。碳化钨含量从30%提升到50%时,涂层硬质层的平均硬度从817HV₁₀提高至929HV₁₀,其硬度是基体的6～8倍,这说明碳化钨颗粒作为硬质相能显著提升涂层的硬度。此外,摩擦系数从0.5降低至0.44,摩擦磨损损失量则从0.005 2 g减少到0.002 4 g,表明碳化钨的加入有效提高了涂层的耐磨性,它在磨损中起到了显著的支撑和抗磨作用。因此,当碳化钨含量为50%时,涂层的硬度和耐磨性达到最佳,同时剪切强度仍能保持较高水平。本研究结果为耐磨涂层设计的优化和工业应用提供了重要参考依据。更多还原

【Abstract】 The NiCrBSi powder,tungsten carbide powder and binder were proportionally mixed to prepare a flexible nickel-based tungsten carbide metal cloth through grinding,ball milling,and roll pressing.The flexible metal cloth was cut to appropriate dimensions and coated onto Q235 lowcarbon steel surfaces,followed by vacuum brazing technology to fabricate nickel-based tungsten carbide wear-resistant coatings.The effects of different tungsten carbide contents（30% to 70%,mass fraction） on shear strength,coating hardness,and wear resistance were investigated.Results show that as the tungsten carbide content increases from 30% to 70%,the coating’ s shear strength significantly decreases from 486.6 MPa to 8 MPa.Due to the insufficient metallurgical bonding strength between steel substrates and nickel-based tungsten carbide coatings with 60% and70% WC（rendering them impractical for applications）,the hardness and wear resistance of coatings with 30% to 50% WC were analyzed here.When the WC content increases from 30% to 50%,the average hardness of the coating’s hard phase layer increases from 817HV₁₀ to 929HV₁₀,representing 6—8 times that of the substrate.This demonstrates that tungsten carbide particles significantly enhance coating hardness as a hard phase.Additionally,the friction coefficient decreases from 0.5 to 0.44,while wear loss reduces from 0.005 2 g to 0.002 4 g,indicating that tungsten carbide effectively improved wear resistance by providing substantial load-bearing and anti-wear effects during abrasion.Therefore,the coating achieved optimal hardness and wear resistance with 50% WC content while maintaining relatively high shear strength.The findings provide critical insights for optimizing wear-resistant coating design and industrial applications.更多还原