Ti/TiH<sub>2</sub>注射成形的催化脱脂及烧结工艺

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摘要为解决钛的加工难题和降低加工成本,利用价格低廉的TiH₂粉与球形Ti粉混合,得到不同质量配比的Ti/TiH₂复合Ti粉,与聚甲醛基黏结剂混炼后研究金属注射成形的催化脱脂以及烧结工艺。在催化脱脂工艺研究中,通过对比4组注射坯在不同脱脂温度和时间下的脱脂率,确定最佳催化脱脂温度为120 ℃,脱脂时间为5 h。在该条件下,4组注射坯脱脂率都超过85%,达到预期催化脱脂目标。在烧结工艺研究中,通过研究了4组脱脂坯在不同烧结温度下的收缩率、致密度和抗拉强度,确定最佳的烧结温度为1 250 ℃。在1 250 ℃、2 h真空烧结的条件下,随复合钛粉中TiH₂比例增加,烧结试样综合力学性能下降。其中Ti和TiH₂质量配比为4:1的烧结样品综合力学性能较好,抗拉强度为649 MPa、硬度为241 HV,伸长率为6.9%,且TiH₂粉可以有效降低成本,具有很好的工业化应用前景,对钛和钛合金的广泛应用具有重要意义。

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	姚尹城
	邱耀弘
	肖志瑜

关键词 ：金属注射成形, 钛, 氢化钛, 催化脱脂, 烧结

Abstract：In order to solve the problem of titanium processing and reduce the processing cost, cheap TiH₂ powders were mixed with spherical titanium powders with different mass proportions to form Ti/TiH₂ composite titanium powders, which were mixed with polyoxymethylene-based binder for catalytic debiuding and sintering process of metal injection molding. In the research of catalytic debinding process, by comparing the debinding rate of the four groups of injection blanks at different debinding temperatures and time, it was determined that the optimal catalytic debinding temperature was 120 ℃ and the best debinding time was 5 hours. Under these conditions, the debinding rate of the four groups of injection blanks all exceeded 85%, reaching the expected catalytic debinding target. In the sintering process research, the shrinkage, density and tensile strength of the four groups of debinding blanks at different sintering temperatures were studied, and the optimal sintering temperature was 1 250 ℃. Under the sintering condition of 1 250 ℃ for 2 h, with the increase of the proportion of TiH₂, the comprehensive mechanical properties of the sintered samples decrease. The sintered sample with Ti and TiH₂ mass proportions of 4:1 has good comprehensive mechanical properties, with a tensile strength of 649 MPa, a hardness of 241 HV, and an elongation of 6.9%. The TiH₂ powder can effectively reduce costs, and has a good industrial application prospect. It is of great significance to the wide application of titanium and titanium alloys.

Key words： metal injection molding titanium titanium hydride catalytic debinding sintering

收稿日期: 2021-04-14 出版日期: 2021-09-26

ZTFLH:

TF124.5

基金资助:广东省科技项目(2014B010129003)

通讯作者: 肖志瑜,教授,博士。电话：020-87110099;E-mail: zhyxiao@scut.edu.cn

引用本文:

姚尹城, 邱耀弘, 肖志瑜. Ti/TiH₂注射成形的催化脱脂及烧结工艺[J]. 粉末冶金材料科学与工程, 2021, 26(4): 355-362.
YAO Yincheng, QIU Yaohong, XIAO Zhiyu. Catalytic debinding and sintering process of metal injection molding used by Ti/TiH₂. Materials Science and Engineering of Powder Metallurgy, 2021, 26(4): 355-362.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I4/355

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