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首页> 外文期刊>International Journal of Refractory Metals & Hard Materials >Sintering parameters and wear performances of vitrified bond diamond grinding wheels
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Sintering parameters and wear performances of vitrified bond diamond grinding wheels

机译：陶瓷结合剂金刚石砂轮的烧结参数和磨损性能

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摘要

A glass matrix was chosen to bond diamond grits into vitrified bond diamond grinding wheels. The processing variables included the variation of volume percentages of pore-forming polymer beads, sintering atmosphere, sintering temperature, and sintering time. Thermal mechanical analysis was carried out to identify the shrinking behavior of the composite during sintering, showing that the shrinkage of the composite became significant at temperatures higher than the glass transition temperature of the glass bonding matrix (around 520-600 deg C). Raman spectra were used to identify the influence of sintering atmosphere on the diamond grits. Results indicated that air atmosphere was required for clean burnout of the pore-forming polymer beads, while an inert atmosphere such as nitrogen was necessary for the high temperature sintering, in order to avoid the oxidation and graphitization of the diamond grits. In the range of the sintering temperature and isothermal holding time investigated in this study, sintering temperature had a greater influence on the wheel's grinding performance than isothermal holding time. The bond hardness and shrinkage percentage closely maintained linear relationships with the isothermal holding time at a sintering temperature of 700 deg C. A highest grinding ratio was achieved when the diamond wheels were sintered at 700 deg C for 120 min.
机译：选择玻璃基质将金刚石砂粒粘结到玻璃化的粘结金刚石砂轮中。加工变量包括成孔聚合物珠粒的体积百分比，烧结气氛，烧结温度和烧结时间的变化。进行热力学分析以鉴定复合物在烧结期间的收缩行为，表明在高于玻璃粘结基质的玻璃化转变温度（约520-600℃）的温度下，复合物的收缩变得显着。拉曼光谱用于鉴定烧结气氛对金刚石砂粒的影响。结果表明，为清洁烧蚀成孔聚合物珠粒需要空气气氛，而高温烧结则需要惰性气氛如氮气，以避免金刚石砂粒的氧化和石墨化。在本研究中研究的烧结温度和等温保持时间范围内，烧结温度比等温保持时间对砂轮的磨削性能影响更大。在700℃的烧结温度下，粘结硬度和收缩率与等温保持时间紧密地保持线性关系。当金刚石砂轮在700℃烧结120分钟时，可获得最高的磨削比。

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