钛粉烧结工艺参数控制研究  

Experimental Study on Sintering Parameters Control of Titanium Powder

作　　者：张报清[1,2] 孙应 李亚东 李永佳[1,3] 沈波涛 ZHANG Bao-qing;SUN Ying;LI Ya-dong;LI Yong-jia;SHEN Bo-tao(Kunming Metallurgy College,Kunming 650033,Yunnan,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Kunming Key Laboratory of Comprehensive Utilization of Rare and Precious Metals,Kunming 650033,Yunnan,China;Zhejiang Huayou Cobalt Co Ltd,Jiaxing 314500,Zhejiang,China)

机构地区：[1]昆明冶金高等专科学校,云南昆明650033 [2]昆明理工大学冶金与能源工程学院,云南昆明650093 [3]昆明市稀散及贵金属资源综合利用重点实验室,云南昆明650033 [4]浙江华友钴业股份有限公司,浙江嘉兴314500

出　　处：《矿冶工程》2022年第4期134-138,共5页Mining and Metallurgical Engineering

基　　金：云南省教育厅科学研究基金(2022J1032,2020J0766);昆明冶金高等专科学校科研基金(2021XJZK04,Xxrcxm201901)。

摘　　要：为得到适宜的钛粉烧结工艺参数,从而制备出全致密高性能的钛粉末冶金件,研究了烧结温度、保温时间和升温速率对烧结坯收缩率和相对密度的影响。结果表明:烧结试样的收缩率及相对密度随烧结温度、保温时间升高而增大,随升温速率减小而增大。提高烧结温度可以降低烧结坯孔隙率、减少残余孔隙尺寸,但可能导致材料力学性能下降;保温时间达到4 h后,孔隙逐步扩散、长大和湮灭,大孔隙消失;较低升温速率有利于组织内部缺陷消失、内应力释放和气孔消除。综合考虑烧结效率、烧结炉温度极限、烧结组织控制、烧结试样收缩率、烧结试样相对密度和节约能源等因素,选择烧结温度1200℃、保温时间4 h、升温速率5℃/min。The effects of sintering temperature, holding time and heating rate on shrinkage and relative density of sintered billet were studied to get appropriate sintering parameters for preparing fully dense titanium powder metallurgy parts with high performance. The results show that the shrinkage and relative density of the sintered sample increase with the rise of the sintering temperature and the extension of holding time, and with the decreasing of heating rate. Increasing the sintering temperature can reduce the porosity of the sintered billet and the residual void size, but it may also lead to degradation of the mechanical properties of the material. After the holding time is extended to 4 h, the voids gradually spread, grow and annihilate, and large voids disappear. A lower heating rate is beneficial to elimination of internal defects, release of internal stress and elimination of pores. With sintering efficiency, the temperature limit of sintering furnace, sintered structure control, the shrinkage rate and relative density of sample, as well as energy conservation taken into a comprehensive consideration, it is finally decided that an appropriate sintering temperature is set at 1 200 ℃, holding time is 4 h, and an appropriate heating rate is set at 5 ℃/min.

关 键 词：钛粉 TiH_(2) 冷等静压 烧结 相对密度 孔隙率 

分 类 号：TF125[冶金工程—粉末冶金]