球磨对制备钨钛封垫的原料粉末的影响  

Raw Material Powder by Ball-Milling in Preparation of W-Ti Gasket

作　　者：金钟铃[1] 林涛[1] 邵慧萍[1] 何新波[1] 毕延[2] 徐济安[2] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《稀有金属》2016年第7期679-686,共8页Chinese Journal of Rare Metals

基　　金：广东省产学研相结合项目(2014B090901003);中国工程物理研究院压缩科学中心及冲击波与爆轰物理重点实验室课题(YK2015-0602003)资助

摘　　要：通过粉末冶金方法制备适合于高压封垫材料的W-Ti合金,其中选择W以及Ti或TiH_2为原始粉末,采用行星球磨机球磨,然后经成形和真空烧结得到最终W-Ti合金。利用激光粒度仪、X射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪(EDS)等手段,研究W-Ti和W-TiH_2体系在球磨过程中粉末的形貌、粒度、粒度分布、合金化程度及其对合金组织的影响。结果表明,两个体系混合粉末球磨12.0 h后,W-TiH_2混合粉末的中位径达到1.31μm,约为W-Ti混合粉末的中位径(13.01μm)的10%,因为细小而硬的W粉颗粒促进粗而脆的TiH_2粉末的破碎,使整体粉末粒度变细,呈等轴颗粒状,但对粗而软的Ti粉的破碎没有作用,反而嵌在片状Ti粉上使整体粒度变粗;W-TiH_2混合粉末球磨12.0 h后,中位径由原始的10.87μm急剧降低到1.31μm,再延长球磨时间中位径变化缓慢;随着球磨时间延长到22.0 h,W-TiH_2混合粉末中TiH_2分解与W形成Ti_xW_(1-x)固溶体,同时TiH_2粉与Ti_xW_(1-x)固溶体向纳米级细化,烧结后更容易得到均匀细小的合金组织。The W-Ti alloy, a new gasket material for high pressure cell, was prepared by planetary ball-milling W, Ti or TiH2 pow- ders, compacting and vacuum sintering. The effect of ball milling on powder morphology, particle size, particle size distribution and al- loy microstructure was studied with W-Ti and W-TiH2 powders by laser particle size analyzer, X-ray diffractometer （XRD）, scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. The results showed that the median diameter of the W-TiH2 mixed powder was about 1.31 μm after ball-milling for 12.0 h, which was only 10% of that of W-Ti milled powder （ 13.01 μm）. Dur- ing ball-milling process, fine and hard W particles promoted crushing of coarse and crisp TiH2 powder particles, which reduced the particle size and made particles equiaxed shape. For coarse and soft Ti particles, however, W particles were embedded in the Ti parti- cles which made the particle size larger. After 12.0 h of ball-milling, the median diameter of W-TiH2 mixed powder reduced from 10. 87 to 1.31 μm. As the ball-milling time extended, the median diameter of W-TiH2 powder decreased slowly. Mechanical alloying of W-TiH2 mixed powder started when the ball milling time was 22.0 h. The TiH2 in W-TiH2 mixture powder decomposed, which formed TixW1-x solid solution with W, while Till2 powder and TixW1-x solid solution were converted into nanocrystalline, which made it easier to obtain fine and homogeneous alloy microstructure after sintering.

关 键 词：钨钛合金 球磨 粒度分布 粒度 高压封垫 

分 类 号：TG146[一般工业技术—材料科学与工程]