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| Fabrication and properties of W-Cu functionally graded materials by tape calendaring method |
| SHEN Xiao1,2，CHENG Ji-gui1,2，LI Jian-feng1,2，CHEN Wen-chao1,2，WEI Chen-long1,2，LUO Lai-ma1,2，WU Yu-cheng1,2 |
1. School of Materials Science and Engineering， Hefei University of Technology， Hefei 230009， China
2. Engineering Research Center of Powder Metallurgy of Anhui Province， Hefei 230009， China |
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Abstract With tungsten powder and electrolytic copper powder as raw materials and PVB as the binder， W-Cu green tapes with different Cu contents (W-25%Cu， W-50%Cu， W-75%Cu， mass percent) were prepared by a tape calendaring method. Green W-Cu graded tapes were obtained by laminating the three W-Cu tapes together， and were subsequently sintered in H2 atmosphere to form W-Cu graded samples. Influence of the binder content on the green tapes was investigated. The formability， microstructure and physical properties were also investigated to evaluate the effect of processing conditions on the sintered W-Cu graded samples. The results indicate that W-Cu composite materials with layered structures can be successfully fabricated by a process based on tape calendaring and lamination. The binder content has an obvious effect on the density and properties of the W-Cu graded materials， and the green tapes with 6% (mass percent) binder show better formability and lower porosity. The W-Cu composite materials with layered structures sintered at 1 150 ℃ have a relative density of 93.11%. The resultant W-Cu graded materials have excellent physical and mechanical properties.
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Received: 10 December 2015
Published: 15 December 2016
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2016, Vol. 26 
