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。
Following the u . s . department of the treasurys announcement , the ma has today issued new directions to require the manager to take steps commensurate with the latest development , including maintaining adequate liquidity and making other necessary arrangements to protect the interests of dac s depositors and customers including securities customers 在美国财政部的公布后，金融管理专员今天已向经理人发出新的指示，要求其采取与最新发展相应的措施，其中包括确保维持足够流动资金及作出其他所需安排，以保障汇业信贷有限公司存户及客户包括证券客户的利益。
Being fine , homogeneous and free of melting , the powder prepared by mechanical alloying has applied to develop scattering strengthen - material , magnetic material , high - temperature material , superconductivity material , amorphous , and non - equilibrium material , compound material etc . as a high - tech technology to prepare alloying powder , ma has become a more and more important method for preparing new materials 机械合金化法制备的粉末晶粒细小、成分均匀，且能避免熔化过程，已用于开发研制弥散强化材料、磁性材料、高温材料、超导材料、非晶、准晶、纳米晶等各种状态的非平衡材料、复合材料、轻金属高比强材料、储氢材料、过饱和固溶体等。作为制备合金粉末的非平衡高新技术，越来越成为一种制备新材料的重要方法。
