粉末冶金技术2026，Vol.44Issue(3)：305-312,381,9.DOI:10.19591/j.cnki.cn11-1974/tf.2025090002
"氢气脱氧预烧结+放电等离子烧结"两步法制备低氧高致密超细晶钼
Preparation of low-oxygen and high-density ultrafine-grained molybdenum with two-step method of hydrogen deoxidation pre-sintering and spark plasma sintering
严平 1王红阳 2张国华 3周新文 1刘宏亮1
作者信息
- 1. 金堆城钼业股份有限公司,西安 710077
- 2. 金堆城钼业股份有限公司,西安 710077||北京科技大学绿色低碳钢铁冶金全国重点实验室,北京 100083
- 3. 北京科技大学绿色低碳钢铁冶金全国重点实验室,北京 100083
- 折叠
摘要
Abstract
High-density ultrafine-grained molybdenum was prepared using ultrafine molybdenum powder(0.40 μm)with the two-stage sintering method of hydrogen deoxidation pre-sintering and spark plasma sintering(SPS).It is found that by pre-sintering at 1000℃in hydrogen for 2 hours,the mass fraction of oxygen in ultrafine molybdenum powder decreased from 0.237％to 0.066％.After pre-sintering,a large number of sintering necks are formed,but the grain size does not significantly increase.Then,the pre-sintered samples sintered by SPS at 1200℃ under 50 MPa for 10 min undergo the densification sintering and the relative density reaches 99.2％.Due to the relatively low sintering temperature(1200℃),the average grain size is 0.88 μm,the growth of grain size is not significant.Benefiting from the low oxygen content,high relative density,and small grain size,the Vickers hardness and bending strength of the Mo samples are HV 300 and 523 MPa,respectively.However,reducing the SPS sintering temperature to 1100℃ may result in the insufficient sintering with the relative density being only 91.3％,and the Vickers hardness and bending strength dropping to HV 215 and 343 MPa,respectively.Increasing the SPS sintering temperature to 1300℃ may caused the grain size to increase significantly to 6.95 μm,and the Vickers hardness and bending strength decreases to HV 197 and 467 MPa,respectively.关键词
预烧结/放电等离子烧结/纯钼/细晶/硬度/抗弯强度Key words
pre-sintering/spark plasma sintering/pure molybdenum/fine grain/hardness/bending strength分类
矿业与冶金引用本文复制引用
严平,王红阳,张国华,周新文,刘宏亮.."氢气脱氧预烧结+放电等离子烧结"两步法制备低氧高致密超细晶钼[J].粉末冶金技术,2026,44(3):305-312,381,9.
