近球形TC4钛合金粉末注射成形  

Injection Molding of TC4 Titanium Alloy Using Quasi-Spherical Powders

作　　者：田汉清 陈刚 刘畅 魏敬浩 韩龙晓 秦明礼 曲选辉 TIAN Hanqing;CHEN Gang;LIU Chang;WEI Jinghao;HAN Longxiao;QIN Mingli;QU Xuanhui(Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Material and Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学新材料技术研究院北京材料基因工程高精尖创新中心,北京100083

出　　处：《航空制造技术》2024年第5期110-115,共6页Aeronautical Manufacturing Technology

基　　金：国家重点研发计划(2021YFB3701900);国家自然科学基金(51971036);山东省重点研发计划(2019JZZY010327)。

摘　　要：以低成本的氢化脱氢(HDH)TC4钛合金粉末为原料,通过气流磨(Jet-milled,JMed)技术对粉末进行整形改性,并进行了注射成形工艺研究。其中,分别以HDH、JMed HDH和气雾化球形(GA)3种粉末为原料,研究并对比了不同粉末原料注射成形的喂料极限装载量、烧结致密度、杂质含量、显微组织及力学性能等。结果表明,经气流磨处理后的JMed粉末形貌呈近球形,其球形度较未处理原始HDH粉末得到了显著提高,其喂料极限装载量(体积分数)较未处理原始HDH粉末提高了6%,在1300℃烧结2 h后,JMed粉末烧结件的致密度为98.3%,高于原始HDH粉末烧结件的致密度(95.3%),且与GA粉末烧结件的致密度(98.4%)相当;JMed粉末烧结件的室温抗拉强度为904.2 MPa,屈服强度为809.1 MPa,与GA粉末烧结件强度相当,断裂延伸率8.14%,显著优于原始HDH粉末烧结件。本研究制备的近球形HDH TC4粉末在注射成形领域展现出良好的应用前景。Injection molding of the TC4 titanium alloy was investigated using the low-cost hydrogenation-dehydrogenation(HDH)powders modified by jet-milled(JMed)as the raw material.Three types of powders,including HDH,jet-milled(JMed)HDH and gas-atomized(GA),were compared in terms of maximum loading capacity,sintered density,impurity content,microstructure,and mechanical properties.Results showed that the particle sphericity of the JMed powder was significantly improved and thus enhanced the maximum loading capacity(volume fraction)by 6%,and exhibited higher sintering densification,as compared to the original HDH powders.After sintering at 1300℃for 2 h,the density of the sintered parts using the JMed powders is 98.3%,higher than that using the original HDH powders(95.3%),while equivalent to that using the GA powders(98.4%).The room temperature mechanical properties of the sintered parts using the JMed powders showed the tensile strength of 904.2 MPa,yield strength of 809.1 MPa,elongation of 8.14%respectively,much better than those using the original HDH powders.Furthermore,the strength of the sintered parts using the JMed powders demonstrated equivalent performance to that using the GA powders,indicating the quasi-spherical TC4 powders exhibiting a great potential for engineering applications.

关 键 词：粉末注射成形 钛合金 烧结 粉体改性 显微组织 力学性能 

分 类 号：TF124.39[冶金工程—粉末冶金]