金刚石工具用铜基预合金粉末的制备及性能研究
发布时间：2018-07-24 08:02
【摘要】：课题采用共沉淀法制备预合金粉末,以CuCl_2·2H_2O、FeCl_2·4H_2O、SnCl_2·2H_2O、NiCl_2·6H_2O为原料,草酸为沉淀剂,制备出所需铜基预合金粉末。重点研究了不同的工艺过程对预合金粉末的粒度和以及粉末收得率的影响,分析了煅烧温度、还原温度、还原时间对预合金粉末的粒度和形貌的影响;采用万能材料试验机、数显密度计、洛氏硬度计等检测设备,探讨了不同制备方法制备出的预合金粉末对样条力学性能的影响及不同铜含量对锯片性能的应用研究。研究表明:当加料方式设为并加,pH值设定为5,陈化时间确定为40min,反应过程温度为50℃,反应溶液浓度的为1.0mol/L,此工艺条件下,制备出粉体的粒度最细,且收得率最高;前驱体表面光滑,形貌多为棒状,形状不规则,大部分为多面体,平均粒度2~5μm;衍射峰宽化,说明该情况下粉体的晶粒细小;当煅烧温度在500℃时,粒度细小,为2μm左右;在形貌上仍与前驱体粉末保持一致;使用氢气还原后,得到的粉体颗粒细小,粒度在2~3μm之间,且颗粒之间相互交织;制备出的预合金粉末各元素的比例与投料时加入的原料的比例相差不大。当烧结工艺参数选取为820℃、5min、4MPa时,材料性能最佳,可作为最优工艺参数组合;分别研究了单质混合粉、雾化法和共沉淀法制备三种粉体制备样条在不同温度下的力学性能,其结果表明:共沉淀法的粉体制备样条抗弯强度最高为1155.2MPa,比雾化法粉体制备样条的最大抗折强度值(1021.2MPa)提高了11.6%,比单质混合粉体制备样条的最大抗折强度值(882.5MPa)提高了23.6%;共沉淀法的粉体制备样条硬度最高为112.5,比雾化法粉体制备样条的最大硬度值(106.9)提高了5.03%,比单质混合粉体制备样条的最大硬度值(90.85)提高了19.24%;共沉淀法的粉体制备样条密度最高为7.83 g/cm3,比雾化法粉体制备样条的最大密度值(7.67g/cm3)提高了2.04%,比单质混合粉体制备样条的最大密度值(7.63 g/cm3)提高了3%。当制备出的锯片切割相同长度的花岗岩后,发现当铜含量为50%时,锯片的失重是最小为1.16g,磨耗比也最低为9.67g/m~2,此时,锯片有最优的性能,锋利度也高。
[Abstract]:The prealloyed powder was prepared by coprecipitation method. Using CuCl_2 _ 2H _ 2O-FeCl _ 2 / S _ 2H _ 2O _ 2H _ 2O _ 2H _ 2O _ 2H _ 2O _ 2 / NiCl _ 2 6H_2O as raw material and oxalic acid as precipitant, the copper base prealloyed powder was prepared. The effects of different technological processes on the particle size and recovery rate of prealloyed powder were studied, and the effects of calcination temperature and reduction time on the particle size and morphology of prealloyed powder were analyzed. The influence of prealloyed powder prepared by different preparation methods on the mechanical properties of spline and the application of different copper content to the performance of saw blade were studied. The results showed that when the feeding mode was set as pH 5, the aging time was 40 min, the reaction temperature was 50 鈩，
本文编号：2140741
[Abstract]:The prealloyed powder was prepared by coprecipitation method. Using CuCl_2 _ 2H _ 2O-FeCl _ 2 / S _ 2H _ 2O _ 2H _ 2O _ 2H _ 2O _ 2H _ 2O _ 2 / NiCl _ 2 6H_2O as raw material and oxalic acid as precipitant, the copper base prealloyed powder was prepared. The effects of different technological processes on the particle size and recovery rate of prealloyed powder were studied, and the effects of calcination temperature and reduction time on the particle size and morphology of prealloyed powder were analyzed. The influence of prealloyed powder prepared by different preparation methods on the mechanical properties of spline and the application of different copper content to the performance of saw blade were studied. The results showed that when the feeding mode was set as pH 5, the aging time was 40 min, the reaction temperature was 50 鈩，
本文编号：2140741
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