材料期刊网，材料期刊，材料类期刊，材料期刊投稿

本文采用示差扫描量热法(DSC)和X射线衍射技术(XRD)研究了由纯金属与硼的元素粉末制备TiAl+TiB_2复合材料的合成过程研究结果表明:在Ti-Al-B系中,由于Ti-Al间的放热反应使TiB_2在700℃以下便可合成;所得到的复合材料经重溶后,TiB_2粒子的相对量、形态和尺寸均没有明显的变化,显示出了良好的热稳定性;TiB_2粒子的存在对TiAl铸态合金有非常明显的细化晶粒作用

关键词: TiAl合金 , TiB_2 , composite , thermal stability

点焊电极表面电火花沉积TiB_2涂层的特征

罗成 , 熊翔 , 董仕节 , 罗平

材料热处理学报

在CuCrZr电极表面通过电火花振动沉积制备了TiB_2功能涂层,测试了功能涂层的显微形貌、物相、硬度以及界面元素分布.试验表明,TiB_2涂层电极具有典型的电火花涂层结构,存在明显的元素互扩散,表明功能层与基体之间为冶金结合.但TiB_2涂层结构不致密,存在裂纹和孔洞,硬度较低.随着电火花电容和电压的增加.涂层的硬度降低.元素扩散和涂层氧化的加剧,是导致涂层硬度降低的主要原因.由于基体Cu的气化、脆性剥落和熔敷棒的切削作用,沉积TiB_2后基体质量反而降低.高电压下电火花沉积以及预涂敷Ni,都会导致基体质量降低更多.

关键词: 点焊电极 , TiB_2 , 显微结构 , 电火花沉积 , 性能 , 功能涂层

SYNTHESIS OF TiAl+TiB_2 COMPOSITE AND-ITS THERMAL STABILITY

QU Xuanhui HUANC Baiyun LEI Changming CHEN Shiqi Central South University of Technology , Changsha , China professor , Powder Metallurgy Research Institute , Central South University of Technology , Changsha 410083 , China

金属学报(英文版)

Synthesis process of a TiAl+TiB_2 composite from the elemental powders was studied by means of differential scanning calorimetry and X-ray diffractometry.TiB_2 particles may form in TiAl matrix at temperature even below 700℃ owing to the exothermic reactions between Ti and Al powders.TiB_2 particles are very thermally stable,and they almost did not change in their relative amount,morphology and size after the synthesized composite was remelted.In addition,the existence of TiB_2 particles has obvious refining effect in the as-cast microstructure of TiAl-base alloys.

关键词: TiAl alloy , null , null , null