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Chin J Mater Res  2009, Vol. 23 Issue (4): 363-368    DOI:
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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
Cite this article: 

FAN Jinglian CHEN Yubo HAN Yong CHENG Huichao TIAN Jiamin. Preparation and sintering behavior of ultra--fine Mo--30Cu composite powders. Chin J Mater Res, 2009, 23(4): 363-368.

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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.

Received:  18 July 2007     
ZTFLH: 

TG146

 
Fund: 

Supported by National Natural Science Foundation of China No.50874122 and No.50721003.

URL: 

https://www.cjmr.org/EN/     OR     https://www.cjmr.org/EN/Y2009/V23/I4/363

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