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从上一讲对人造金刚石和立方氮化硼磨料物理机械性能的介绍中,我们可以看出这两种超硬磨料的优异性能。金刚石从硬度、强度、导热系数、热膨胀系数和研磨能力各方面均优于立方氮化硼和其他磨料。但由于金刚石是碳的同素异形体,当温度较高时(700℃以上)易与铁族金属产生化学作用而形成碳化物,造成严重的化学磨损,影响加工效果。所以,金刚石磨具通常不宜用来磨削钢铁材料,但适于加工硬脆材料,如硬质合金、陶瓷、玻
From the introduction to the physical and mechanical properties of synthetic diamond and cubic boron nitride abrasives, we can see the superior performance of these two super-hard abrasives. Diamond is superior to cubic boron nitride and other abrasives in terms of hardness, strength, thermal conductivity, coefficient of thermal expansion and grinding ability. However, since diamond is an allotrope of carbon, when the temperature is high (above 700 ° C), it easily forms chemical carbides with iron group metals, causing serious chemical abrasion and affecting the processing effect. Therefore, diamond grinding tools are usually not suitable for grinding steel materials, but suitable for processing hard and brittle materials, such as cemented carbide, ceramic, glass