Metal injection moulding of non-spherical titanium powders: Processing, microstructure and mechanical properties
Metal injection moulding of non-spherical titanium powders: Processing, microstructure and mechanical properties
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DOI：
10.1016/j.jmapro.2017.12.004
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发表时间：
2018-01-01
影响因子：
6.2
通讯作者：
Qian, M.
中科院分区：
文献类型：
--
作者：
Dehghan-Manshadi, A.;StJohn, D.;Qian, M.
通过一系列实验室规模的注射成型研究，确定了使用平均粒径为 45 pm 的廉价非球形氢化物-二氢化物 (HDH) 粉末进行钛金属注射成型 (MIM) 的关键工艺参数。热脱脂和烧结过程中 1.0 K/min 的缓慢加热速率导致样品的变形可忽略不计或有限，并且在所有方向上的收缩几乎均匀。 1250℃烧结120min被认为是HDH Ti MIM的合适条件，所生产的样品相对密度为96.5%，沿长度方向均匀收缩率为13.9%，沿厚度方向均匀收缩率为14.7%。烧结态样品的拉伸强度为 395 MPa，伸长率为 12.5%。良好的拉伸伸长率表明，HDH 钛粉的 MIM 可以应对最初廉价的 HDH Ti 粉末中相对较高的氧含量，以及 MIM 循环过程中不可避免的氧含量进一步增加。 (C) 2017 年制造工程师协会。由爱思唯尔有限公司出版。保留所有权利。
The critical processing parameters for metal injection moulding (MIM) of titanium using inexpensive non-spherical hydride-dehydride (HDH) powders with an average particle size of 45 pm were established through a series of laboratory scale injection moulding investigations. A slow heating rate of 1.0 K/min during thermal de-binding and sintering resulted in samples with negligible or limited distortion and nearly uniform shrinkage in all directions. Sintering at 1250 degrees C for 120 min was identified to be a suitable condition for MIM of HDH Ti, which produced samples with a relative density of 96.5%, uniform shrinkage of 13.9% along the length direction and 14.7% along the thickness direction. The as-sintered samples achieved a tensile strength of 395 MPa and elongation of 12.5%. The promising tensile elongation indicates that MIM of HDH titanium powder can cope with the relatively high oxygen level in the initial inexpensive HDH Ti powder as well as the unavoidable further increase in oxygen level during the MIM cycle. (C) 2017 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.