Effect of processing on toughness index of diamond grains during vacuum brazing
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摘要: 为减轻钎焊单层金刚石工具中的磨料热损伤,从钎焊金刚石的热损伤机理出发,提出4种热损伤控制方案,并进行试验验证。通过SEM观察和磨料冲击韧性测试对各方案的可行性进行分析。结果表明:降低炉内氧含量的工艺对常温冲击韧性TI值提升效果不明显;降低钎料触媒元素比例和使用Ti-Ni复合镀层金刚石,TI值相比原工艺最多可分别增加15%和20%以上;铜基钎料对金刚石热损伤最小,钎焊后磨料冲击韧性可达原料值的91.5%。Abstract: To reduce the thermal damage when brazing diamond, four solutions are proposed and tested according to the thermal damage mechanism of diamonds.SEM observation and toughness index test are used to analyze those solutions.Resultsshow that reducing oxygen content in the stove has limited effect on improving toughness index (TI) values of diamond, while reducing content of catalyst and coating diamond with Ti-Ni composite layers would increase TI, compared with that of the original process, by more than 15% and 20% separately.It is found that Cu-based solder causes the smallest thermal damage to diamond, whose toughness index remains 91.5% of the original state.
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Key words:
- diamond tools /
- catalyst element /
- oxygen content /
- solder type
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