【摘要】：課題采用共沉淀法制備預(yù)合金粉末,以CuCl_2·2H_2O、FeCl_2·4H_2O、SnCl_2·2H_2O、NiCl_2·6H_2O為原料,草酸為沉淀劑,制備出所需銅基預(yù)合金粉末。重點(diǎn)研究了不同的工藝過(guò)程對(duì)預(yù)合金粉末的粒度和以及粉末收得率的影響,分析了煅燒溫度、還原溫度、還原時(shí)間對(duì)預(yù)合金粉末的粒度和形貌的影響;采用萬(wàn)能材料試驗(yàn)機(jī)、數(shù)顯密度計(jì)、洛氏硬度計(jì)等檢測(cè)設(shè)備,探討了不同制備方法制備出的預(yù)合金粉末對(duì)樣條力學(xué)性能的影響及不同銅含量對(duì)鋸片性能的應(yīng)用研究。研究表明:當(dāng)加料方式設(shè)為并加,pH值設(shè)定為5,陳化時(shí)間確定為40min,反應(yīng)過(guò)程溫度為50℃,反應(yīng)溶液濃度的為1.0mol/L,此工藝條件下,制備出粉體的粒度最細(xì),且收得率最高;前驅(qū)體表面光滑,形貌多為棒狀,形狀不規(guī)則,大部分為多面體,平均粒度2~5μm;衍射峰寬化,說(shuō)明該情況下粉體的晶粒細(xì)小;當(dāng)煅燒溫度在500℃時(shí),粒度細(xì)小,為2μm左右;在形貌上仍與前驅(qū)體粉末保持一致;使用氫氣還原后,得到的粉體顆粒細(xì)小,粒度在2~3μm之間,且顆粒之間相互交織;制備出的預(yù)合金粉末各元素的比例與投料時(shí)加入的原料的比例相差不大。當(dāng)燒結(jié)工藝參數(shù)選取為820℃、5min、4MPa時(shí),材料性能最佳,可作為最優(yōu)工藝參數(shù)組合;分別研究了單質(zhì)混合粉、霧化法和共沉淀法制備三種粉體制備樣條在不同溫度下的力學(xué)性能,其結(jié)果表明:共沉淀法的粉體制備樣條抗彎強(qiáng)度最高為1155.2MPa,比霧化法粉體制備樣條的最大抗折強(qiáng)度值(1021.2MPa)提高了11.6%,比單質(zhì)混合粉體制備樣條的最大抗折強(qiáng)度值(882.5MPa)提高了23.6%;共沉淀法的粉體制備樣條硬度最高為112.5,比霧化法粉體制備樣條的最大硬度值(106.9)提高了5.03%,比單質(zhì)混合粉體制備樣條的最大硬度值(90.85)提高了19.24%;共沉淀法的粉體制備樣條密度最高為7.83 g/cm3,比霧化法粉體制備樣條的最大密度值(7.67g/cm3)提高了2.04%,比單質(zhì)混合粉體制備樣條的最大密度值(7.63 g/cm3)提高了3%。當(dāng)制備出的鋸片切割相同長(zhǎng)度的花崗巖后,發(fā)現(xiàn)當(dāng)銅含量為50%時(shí),鋸片的失重是最小為1.16g,磨耗比也最低為9.67g/m~2,此時(shí),鋸片有最優(yōu)的性能,鋒利度也高。
[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，

本文編號(hào)：2140741