Reaction of titanium investment castings made by Zr(CH3COO)2-Y2O3 shell  

作　　者：Xin Guo Ya-Meng Wei Zhi-Gang Lu 

机构地区：[1]Department of Mechanical Engineering, Tsinghua University,Beijing 100084, China [2]Academy of Opto-Electronics, Chinese Academy of Sciences,Beijing 100094, China [3]State Key Laboratory of Tribology, Tsinghua University,Beijing 100084, China

出　　处：《Rare Metals》2017年第6期465-471,共7页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.50875144)

摘　　要：The forming process and mechanism of the reaction of Ti-6Al-4V investment casting made by Zr（CH3COO）2-Y2O3 shell in vacuum casting was studied.Statistic was manipulated to study the distributions and types of the reaction layers. The morphology and composition of the reaction layers were tested using field emission scanning electron microscopy（FESEM） combined with energy-dispersive spectroscopy（EDS）. Phase of the reaction layers was characterized by X-ray diffraction（XRD）.Composition of the shell reaction zone was measured by X-ray fluorescence（XRF） method. The results suggest the reaction contains oxidation and element evaporation, and the melt reacts little with the shell but mainly with the remnant gas. The reaction layers contain three types due to different forming stages： the titanium oxidation film, the concretion film and the shell reaction zone. The interfacial temperature and pressure affect the reaction mechanism and degree, leading to three types of concretion films that differ in thickness, content and color.The forming process and mechanism of the reaction of Ti-6Al-4V investment casting made by Zr（CH3COO）2-Y2O3 shell in vacuum casting was studied.Statistic was manipulated to study the distributions and types of the reaction layers. The morphology and composition of the reaction layers were tested using field emission scanning electron microscopy（FESEM） combined with energy-dispersive spectroscopy（EDS）. Phase of the reaction layers was characterized by X-ray diffraction（XRD）.Composition of the shell reaction zone was measured by X-ray fluorescence（XRF） method. The results suggest the reaction contains oxidation and element evaporation, and the melt reacts little with the shell but mainly with the remnant gas. The reaction layers contain three types due to different forming stages： the titanium oxidation film, the concretion film and the shell reaction zone. The interfacial temperature and pressure affect the reaction mechanism and degree, leading to three types of concretion films that differ in thickness, content and color.

关 键 词：Titanium alloy Investment casting REACTION Oxidation Element evaporation 

分 类 号：TG292[金属学及工艺—铸造] O643.12[理学—物理化学]