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材料研究学报  2009, Vol. 23 Issue (4): 363-368    
  研究论文 本期目录 | 过刊浏览 |
超细Mo--30Cu复合粉末的烧结行为
范景莲;  陈玉柏;  韩勇;  成会朝;  田家敏
中南大学粉末冶金国家重点实验室  长沙 410083
Preparation and sintering behavior of ultra--fine Mo--30Cu composite powders
FAN Jinglian ; CHEN Yubo;  HAN Yong;   CHENG Huichao;  TIAN Jiamin
State Key Laboratory of Powder Metallurgy; Central South University; Changsha 410083
引用本文:

范景莲 陈玉柏 韩勇 成会朝 田家敏. 超细Mo--30Cu复合粉末的烧结行为[J]. 材料研究学报, 2009, 23(4): 363-368.
. Preparation and sintering behavior of ultra--fine Mo--30Cu composite powders[J]. Chin J Mater Res, 2009, 23(4): 363-368.

全文: PDF(1144 KB)  
摘要: 

采用溶胶--喷雾干燥--煅烧--氢还原方法制备了晶粒尺寸为17--30 nm的超细Mo--30Cu复合粉末, 在制备过程中经历了一系列的相转变,  由喷雾干燥复合盐前驱体Cu 7.6 O 8(NO3 )+(NH 4) 2(Mo 4O 13)+(NH 4)6(Mo7O24)(H2O)4 +Cu4Mo5O17+CuMoO4 在450℃煅烧后转变为CuMoO 4+MoO 3复合氧化物, 在300℃低温还原转变为MoO 2+ Cu2 O + Cu三相, 再在700℃高温还原完全转变为Mo+Cu两相复合粉末. 该粉末在1050--1200℃烧结时从亚稳态Mo(Cu)固溶体逐渐转变为Mo和Cu相, 在1050℃烧结后得到致密度为99.7\%的细晶合金.合金的最大抗拉强度可达755 MPa, 最大延伸率可达15.8%.

关键词 金属材料Mo--Cu超细粉末烧结行为力学性能显微组织    
Abstract

Ultra–fine Mo–30Cu composite powders with the diameter of 17–30 nm were fabricated by sol–spray drying calcination and subsequent hydrogen reduction process. A series of phase transition occured during the preparation process of the composite powders, composite oxides of CuMoO4 and MoO3 were obtained after the compound–precursor Cu7.6O8 (NO3)+(NH4)2 (Mo4O13)+(NH4)6(Mo7O24)(H2O)4+ Cu4 Mo5O17+CuMoO4 were calcined, and then changed into MoO 2+Cu2O+Cu after reduction at 300 ℃, and at last transformed into Mo+Cu composite powders after reduction at 700℃. Densification behavior during sintering, mechanical property and microstructure of the alloy were investigated. The metastable Mo(Cu) solid solution gradually changed into Mo and Cu during the green compact sintering in temperature range of 1050℃ to 1200℃. The fine grained alloy whose relative density can be up to 99.7% was achieved after Mo–30Cu composites sintered at 1050℃ for 60 min in H2 atmosphere. The maximum tensile strength and elongation rate of the alloy are 755 MPa and 15.8%, respectively.

收稿日期: 2007-07-18     
ZTFLH: 

TG146

 
基金资助:

国家自然科学基金50874122和国家自然科学基金创新群体基金50721003项目资助.

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