Oxygen variation in titanium powder and metal injection molding  

作　　者：Junping Shen Chang Liu Muhammad Dilawer Hayat Jianan Chen Hanqing Tian Fusheng Xin Gang Chen Fei Yang Mingli Qin Xuanhui Qu 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China [2]School of Engineering,The University of Waikato,Hamilton 3216,New Zealand [3]Institute of Materials Intelligent Technology,Liaoning Academy of Materials,Shenyang 110004,China [4]Beijing Laboratory of Metallic Materials and Processing for Modern Transportation,Beijing 100083,China [5]Ningbo Titan Advanced Materials Technology Co.,Ltd.,Ningbo 315012,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第12期2706-2713,共8页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2021 YFB3701900);the National Natural Science Foundation Program of China(No.51971036);the Open Research Fund of State Key Laboratory of Mesoscience and Engineering(No.MESO-23-D07).

摘　　要：The control of oxygen is paramount in achieving high-performance titanium(Ti)parts by powder metallurgy such as metal in-jection molding(MIM).In this study,we purposely selected the Ti and Ti-6Al-4V powders as the reference materials since these two are the most representative Ti materials in the industry.Herein,hydride-dehydride(HDH)Ti powders were pre-oxidized to examine the ef-fect of oxygen variation on the characteristics of oxide layer on the particle surface and its resultant color feature.The results indicate that the thickness and Ti oxide level(Ti^(0)→Ti^(4+))of the oxide layer on the HDH Ti powders increased as the oxygen content increased,lead-ing to the transition of color appearance from grey,brown to blue.This work aids in the powder feedstock selection at the initial stage in powder metallurgy.In addition,the development of oxygen content was comprehensively studied during the MIM process using the gas-atomized(GA)Ti-6Al-4V powders.Particularly,the oxygen variation in the form of oxide layer,the change of oxygen content in the powders,and the relevant parts were investigated during the processes of kneading,injection,debinding,and sintering.The oxygen vari-ation was mainly concentrated in the sintering stage,and the content increased with the increase of sintering temperature.The variation of oxygen content during the MIM process demonstrates the crucial role of powder feedstock and sintering stage in controlling oxygen con-tent.This work provides a piece of valuable information on oxygen detecting,control,and manipulation for the powder and processing in the industry of Ti and its alloys by powder metallurgy.

关 键 词：titanium alloys OXYGEN metal injection molding powder metallurgy 

分 类 号：TF124[冶金工程—粉末冶金]