非晶Ni基钎料感应钎焊金刚石微粉及其加工性能的研究
发布时间：2018-11-20 20:08
【摘要】：晶态Ni基钎料开始熔化温度高、熔化温度区间宽,钎焊时金刚石微粉易产生热损伤。非晶Ni基钎料开始熔化温度低、熔化温度区间窄,能够减轻金刚石微粉的热损伤;而且,非晶Ni基钎料对金刚石润湿能力强,适用于短时钎焊,较短的钎焊时间可进一步减轻金刚石微粉的热损伤。因此,如果用非晶Ni基钎料和感应钎焊这种短时加热方式进行金刚石微粉的钎焊,就可以制作出性能优良的钎焊金刚石微粉工具。本课题以钎焊金刚石微粉磨头的制作为例进行了原理性论证工作,获得了以下具有创新意义的结论:(1)所用非晶Ni基钎料的热分析发现,非晶钎料熔化温度大约在913.8~994.2℃,相比于晶态钎料,非晶钎料熔化起始温度降低约20℃,熔化温度区间缩短约30℃。(2)通过钎料对金刚石和钢基体的润湿研究表明,在同等条件下,高温液态钎料在180目砂纸处理的钢基体上铺展面积最大,非晶钎料对基体的润湿强于晶态钎料,有利于保持钎料层的均匀性和增强钎料与基体的结合力;非晶钎料对金刚石的润湿比晶态钎料好,有利于提高钎料对金刚石的把持强度。(3)对钎焊后的金刚石微粉磨头理化分析表明,钎料与基体之间具有良好的冶金结合,金刚石钎焊面有Cr-C化合物生成,增强了钎料对金刚石磨粒的把持强度;非晶钎料磨头钎料层中的金刚石微粉分布更加均匀,提高了磨头的使用寿命。(4)磨削试验显示,在同等条件下,磨削150min后,非晶钎料磨头材料去除率是晶态钎料磨头的3倍多,非晶钎料磨头磨削弧区温度比晶态钎料磨头约低40℃;对失效磨头再修整,非晶钎料磨头材料去除率恢复到磨头初始状态的85%,而晶态钎料磨头再修整效果不明显。通过在钎料选用和加热方式结合上的创新性尝试,优化了金刚石微粉的钎焊工艺,为超硬磨料钎焊工具的工业化生产提供了理论和试验依据。
[Abstract]:The melting temperature of crystalline Ni based solder is high and the melting temperature range is wide. The melting temperature of amorphous Ni based solder is low and the melting temperature range is narrow, which can reduce the thermal damage of diamond powder. Moreover, the amorphous Ni filler metal has strong wetting ability to diamond, which is suitable for short time brazing, and the shorter brazing time can further reduce the thermal damage of diamond powder. Therefore, if we use amorphous Ni solder and induction brazing to braze diamond powder, we can produce fine brazing diamond powder tool. Taking the fabrication of brazed diamond micro-powder grinding head as an example, the paper has carried on the principle demonstration work, has obtained the following innovative conclusion: (1) the thermal analysis of the amorphous Ni filler metal found, The melting temperature of amorphous solder is about 913.89994.2 鈩，
本文编号：2345875
[Abstract]:The melting temperature of crystalline Ni based solder is high and the melting temperature range is wide. The melting temperature of amorphous Ni based solder is low and the melting temperature range is narrow, which can reduce the thermal damage of diamond powder. Moreover, the amorphous Ni filler metal has strong wetting ability to diamond, which is suitable for short time brazing, and the shorter brazing time can further reduce the thermal damage of diamond powder. Therefore, if we use amorphous Ni solder and induction brazing to braze diamond powder, we can produce fine brazing diamond powder tool. Taking the fabrication of brazed diamond micro-powder grinding head as an example, the paper has carried on the principle demonstration work, has obtained the following innovative conclusion: (1) the thermal analysis of the amorphous Ni filler metal found, The melting temperature of amorphous solder is about 913.89994.2 鈩，
本文编号：2345875
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