摘要
利用XRD、SEM和EDX对石墨表面钛金属化微观组织进行了分析研究。结果表明,微观组织依次为内层(石墨)、过渡层(620μm)、致密层(40μm)及外层(α-Ti),XRD及EDX分析证实了致密层的物相为碳化钛,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层与致密层界面处发现微裂纹,可能是因热膨胀系数差异大而产生的热应力所致,可通过缓冷方式来减小热应力。在致密层与过渡层界面处却未发现,主要因为Ti与石墨发生界面反应,形成碳化钛。
The microstructure of surface Ti-metallized graphite was analyzed by XRD, SEM and EDX. The results show that the surface Ti-metallized graphite consists of interior layer (graphite), transition layer (620μm), dense layer (40μm) and exterior layer (Ti). XRD and EDX results show titanium carbide phase in the dense layer. SEM analyses confirm that good bonding exist between the interfaces. The short micro-structural crack between titanium and dense layer was found due to the large difference in the coefficient of thermal expansion. The crack can be eliminated by furnace cooling, instead of air cooling. It was not found between dense layer and transition layer because of titanium carbide deformed by the Ti-C reaction.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2005年第12期89-92,共4页
Transactions of The China Welding Institution
关键词
石墨
钛
金属化
微观组织
graphite
titanium
metallization
microstructure
