摘要
利用XRD,SEM和EDX对石墨表面钛金属化界面的物相、微观组织及成分进行了分析。结果表明,金属化石墨微观组织呈层状结构,依次为内层(石墨)、过渡层、致密层及外层(Ti),其中过渡层厚约为720μm,致密层厚约为40μm。XRD及EDX分析证实了致密层物相为碳化钛,SEM分析证实了致密层与过渡层及Ti层结合牢固。但还发现在Ti层与致密层界面处存在短微裂纹,在致密层与过渡层界面处未有发现,原因主要是材料间的热膨胀系数差异产生热应力所致。并且还对石墨表面金属化机理进行了探讨。研究表明,其机理是通过金属Ti与石墨发生界面反应生成碳化钛来实现。
In this paper, the microstructure and composition of Graphite/Titanium interface were examined by XRD, SEM and EDX. It showed that the Ti-metallized graphite consisted orderly of an interior layer （graphite）, a transition layer, a dense layer and an exterior layer （Ti）. The width of transition layer was measured to be 720 μm, while the width of dense layer is 40 μm approximately. The phase of dense layer is examined to be titanium carbide by XRD and EDX. Good bonding is obtained between the dense layer and the transition layer or the Ti layer. Some short micro-structural cracks between the titanium and dense layer were found, while it was not found between the dense layer and transition layer due to the pronounced difference in the coefficient of thermal expansion （CTE）. And the mechanism of Ti-metallization on graphite was also discussed. It was indicated that the graphite surface was Ti-metallized due to the formation of TiC during the interface reaction between Ti and graphite.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2006年第7期1085-1088,共4页
Rare Metal Materials and Engineering
关键词
石墨
组织
金属化
机理
graphite
microstructure, metallization, mechanism
