元素粉末 meaning in Chinese
elemental powder
Examples
- Because the main raw material tic reduced the reaction - liberated heat , the evaporation of al / si , which was considered to be responsible for tic impurity in product , was decreased
以tic代替元素粉末为原料，可以减小元素粉末反应时的大量放热，减小产物al si的挥发，从而减少产物中tic的含量。 - The results indicate that arc melting is a good method to produce nb - si system intermetallics due to its simpler technics , lower cost and compact products . however , powder metallurgy is found to be not suitable to produce the nb - si system intermetallics due to its coarse and loose products resulting from the poor molding property of nb and si mixed powders . optical floating zone technology , which is used to fabricate nb - si intermetallic composites for the first time , is also found to be a good way to produce nb - si system intermetallics because of its compact products and good property despite of its relatively high cost
结果表明，电弧熔炼方法制备得到的nb - si系金属间化合物比较致密，且制备工艺简单，经济实用，是一种合适的nb - si系金属间化合物制备方法；由于nb 、 si元素粉末的成型性很差，用粉末冶金方法(热压烧结和冷等静压)制备的nb - si系金属间化合物表面粗糙、致密度低，且成本较高，不宜用于制备nb - si系金属间化合物；首次用光学悬浮单晶生长技术制备的nb - si系金属间化合物复合材料致密度很高，尽管成本稍高，但由于性能最佳，也是一种合适的nb - si系金属间化合物制备方法。 - In this work , using elemental powders as starting reactant materials several carbide powders such as wc , sic , tic , zrc and corresponding alloys had been fabricated by ball - milling technique . x - ray diffraction ( xrd ) , scanning electron microscopy ( sem ) , transmission electron microscopy ( tem ) and other measurement techniques had been used to monitor the structural changes of powders after some ball milling time and the properties of the cemented tungsten carbides . and the mechanism for the formation of matal carbides by ma has also been discussed
本文主要对机械合金化( ma )技术在碳化物制备中的应用进行了研究，利用高能球磨，以元素粉末为原料，制备出wc 、 sic 、 tic 、 zrc的粉体以及wc基硬质复合材料，并利用x射线衍射、扫描电镜、透射电镜等方法分析和研究了球磨过程粉体的变化以及烧结后硬质合金的性能，对机械合金化制备碳化物的有关机理进行了研究和探索。