Ni基非晶钎料炉中钎焊金刚石微粉及其加工性能的研究
发布时间：2018-10-24 12:49
【摘要】：晶态Ni基钎料固相线温度高,炉中钎焊制作钎焊微粉金刚石工具耗时长,处于高温环境中的金刚石磨粒极易产生热损伤,导致金刚石磨粒磨削性能下降。为了减少磨粒表面热损伤,同时提高钎料对金刚石磨粒的润湿性,增强金刚石与Ni基钎料之间的结合力,采用非晶Ni基钎料炉中加热制作钎焊微粉金刚石工具,旨在提高钎焊金刚石微粉工具的加工性能。本研究以炉中加热制作钎焊金刚石微粉磨头为例进行原理性论证工作,完成了以下具有创新意义的结论:(1)Ni基钎料热分析曲线显示晶态Ni基钎料熔化温度区间大约为933℃~1044℃,非晶Ni基钎料的熔化温度区间大约为913℃~993℃,其熔化温度区间更窄,熔化速度更快,可以有效减少金刚石磨粒的热损伤。(2)45钢基体粗糙度对Ni基钎料与基体之间的润湿性影响研究表明,随基体粗糙度的增加,非晶Ni基钎料在45钢基体上的润湿面积先升高后降低,晶态钎料则先减少后增加再减少,二者同时在基体粗糙度Ra为0.5μm时润湿面积最大。非晶Ni基钎料的润湿面积随着钎焊温度的升高呈现出先升高后降低的变化趋势,当钎焊温度为950℃时,润湿面积最大为4.9cm2。(3)非晶钎料金刚石磨头磨削工程陶瓷和ZL102铝合金时的材料去除率分别为晶态钎料金刚石磨头的1.26倍和1.3倍,磨削加工225min后,磨削弧区温度比晶态钎料金刚石磨头分别低59℃和70℃。(4)分别对已经磨削加工工程陶瓷和ZL102铝合金300min后的非晶钎料钎焊金刚石磨头进行SiC油石修锐,修锐后的非晶钎料金刚石磨头的工程陶瓷材料去除率相比于未修锐前提高了59%,ZL102铝合金的材料去除率提高了65%。非晶Ni基钎料的使用降低了微粉金刚石钎焊温度,优化了炉中钎焊金刚石工艺,提高了炉中钎焊金刚石微粉工具的磨削性能,对炉中钎焊金刚石微粉工具的广泛使用提供了理论和试验依据。
[Abstract]:Because of the high temperature of solid phase line of crystalline Ni solder and the time consuming of brazing diamond tools in furnace, diamond abrasive particles in high temperature environment are prone to thermal damage, which leads to the degradation of grinding performance of diamond grains. In order to reduce the surface thermal damage of abrasive particles, improve the wettability of brazing materials to diamond abrasive particles, and enhance the bonding force between diamond and Ni base solder, the brazing micro-powder diamond tools were made by heating in amorphous Ni base brazing furnace. The purpose of this paper is to improve the machining performance of brazing diamond powder tools. In this study, the principle of brazing diamond micro-powder grinding head by heating in furnace was studied, and the following innovative conclusions were achieved: (1) the melting temperature range of crystalline Ni based brazing filler metal was about 933 鈩，
本文编号：2291468
[Abstract]:Because of the high temperature of solid phase line of crystalline Ni solder and the time consuming of brazing diamond tools in furnace, diamond abrasive particles in high temperature environment are prone to thermal damage, which leads to the degradation of grinding performance of diamond grains. In order to reduce the surface thermal damage of abrasive particles, improve the wettability of brazing materials to diamond abrasive particles, and enhance the bonding force between diamond and Ni base solder, the brazing micro-powder diamond tools were made by heating in amorphous Ni base brazing furnace. The purpose of this paper is to improve the machining performance of brazing diamond powder tools. In this study, the principle of brazing diamond micro-powder grinding head by heating in furnace was studied, and the following innovative conclusions were achieved: (1) the melting temperature range of crystalline Ni based brazing filler metal was about 933 鈩，
本文编号：2291468
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