Research on vacuum brazing of W-coated diamond with Ni-based filler alloy
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摘要: 为减轻镍基钎料真空钎焊金刚石接头的热损伤与残余应力,采用镀钨金刚石磨粒代替常规金刚石磨粒并将其钎焊到1045钢基体上,对钎焊镀钨金刚石接头的连接性能、热损伤程度及残余应力进行深入研究与分析。结果表明:镍基钎料对镀钨金刚石磨粒展现出良好的润湿性,与钎焊常规金刚石接头相比,钎焊镀钨金刚石接头在结合界面处的裂纹数量及尺寸明显减小。常规金刚石表面生成了致密有序的板条状Cr3C2层,而镀钨金刚石表面则形成了向钎料中生长的无序粒状Cr3C2层。在镀层的隔离保护作用下,钎焊后的镀钨金刚石磨粒表面的石墨化程度更低,力学性能更优异。同时,镀钨金刚石表面更薄、形貌更合理的Cr3C2层有效地缓解了镀钨金刚石接头内部的残余应力,其最大残余压应力相较于常规金刚石的降低9.43%。Abstract: In order to alleviate the thermal damage and residual stresses of brazed diamond joints with Ni-based filler, W-coated diamond grains were used instead of conventional diamond grains and brazed onto 1045 steel substrates. The bonding interface properties, thermal damage and residual stresses of brazed W-coated diamond joints were investigated and studied. The results showed that the Ni-based filler exhibited good wettability to the W-coated diamond grains, and that the number and size of cracks at the bond interface of brazed W-coated diamond joints were significantly reduced compared with those of brazed conventional diamond joints. A dense and orderly Cr3C2 layer was generated on the surface of conventional diamond, while the disordered granular Cr3C2 growing into the filler alloy was formed on the surface of W-coated diamonds. With the isolation and protection of the coating, the brazed W-coated diamond grain surface has lower graphitization and better mechanical properties. At the same time, the thinner and more reasonable morphology of Cr3C2 layer on the surface of W-coated diamond effectively relieves the residual stress, and its maximum residual compressive stress is reduced by 9.43% compared with that of conventional diamond.
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Key words:
- brazing /
- W-coated diamond /
- bonding interfacial /
- thermal damage /
- residual stress
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表 1 镍基合金钎料成分
Table 1. Components of Ni-based filler
成分 质量分数ω1 / % 镍 (Ni) 83 铬 (Cr) 7 铁 (Fe) 4 硅 (Si) 3 硼 (B) 3 表 2 化合物的EDS分析结果
Table 2. EDS analysis results of compounds
点 元素质量分数 ω2 / % 可能相 镍
(Ni)铬
(Cr)碳
(C)硅
(Si)A 1.1 83.4 14.6 0.9 Cr3C2 B 1.3 85.2 12.8 0.7 Cr3C2 -
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