Manufacturing Processes and Properties of Copper—Graphite Composites Produced by High Frequency Induction Heating Sintering

Abstract

In the present article, a study was made of copper/graphite powders and sintered compacts for industrial applications. The sintering behavior and mechanical properties of copper/graphite composite produced by high frequency induction heated sintering (HFIHS) as a novel sintering technique were studied. HFIHS allows very quick densification to near theoretical density of the composite. The copper was modified by addition of 2.5—15 wt.% graphite. A high dense product (97%) could be obtained within 3 min under simultaneous application of 60 MPa pressure. The wear testing was carried out using a pin-on-ring tribometer. The wear resistance increases with increasing the addition of graphite. The weight loss increases with both sliding distance and applied load. Metallographic investigation was carried out using both optical and scanning electron microscopy. For comparison, parallel compacts of pure copper were made under the same consolidation processing applied for copper—graphite composites.

Keywords

copper/graphite HFIHS sintering mechanical properties wear.

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References

Orumwense, F.F.O. , Okorie, B.A. , Okeakpu, E.O. , Obiora, E.N. and Onyeji, L.I. (2001). Sintered Copper—Graphite Powder Compacts for Industrial Applications. Powder Metallurgy , 44(1): 62—66.

Champion, Y. , Bernard, F. , Guigue-Millot, N. and Perriat, P. (2003). Sintering of Copper Nanopowders Under Hydrogen: an In Situ X-ray Diffraction Analysis. Materials Science and Engineering A, 360(1—2): 258—263.

Kestursatya, M. , Kim, J.K. and Rohatgi, P.K. (2003). Wear Performance of Copper—Graphite composite and a Leaded Copper Alloy. Materials Science and Engineering A, 339(1—2): 150—158.

Garcıa-Márquez, J.M. , Antón, N. , Jimenez, A. , Madrid, M. , Martinez, M.A. and Bas J.A. (2003). Viability Study and Mechanical Characterisation of Copper—Graphite Electrical Contacts Produced by Adhesive Joining. Journal of Materials Processing Technology , 143—144: 290—293.

Kovacik, J. and Bielekt, J. (1996). Electrical Conductivity of Cu/Graphite Composite Material as a Function of Structural Characteristics. Scripta Matmialia, 35(2): 151—156.

Orth, J.E. and Wheat, H.G. (1997). Corrosion Behavior of High Energy—High Rate Consolidated Graphite/Copper Metal Matrix Composites in Chloride Media. Applied Composite Materials, 4(5): 305—320.

Dewidar, M.M. and Lim, J.K. (2006). Effect of Graphite Addition and Processing Parameters on the Properties of Copper by High Frequency Induction Heated Sintering Process . Proceedings of ICMAT, International Conference For Mechanical and Automotive Technologies, South Korea, April 26—28: 261—266.

Moustafa, S.F. , El-Badry, S.A. , Sanad, A.M. and Kieback, B. (2002). Friction and Wear of Copper—Graphite Composites Made with Cu-Coated and Uncoated Graphite Powders. Wear, 253(7—8): 699—710.

Kim, H.C. , Shon, I.J. , Yoon, J.K. , Lee, S.K. and Munir, Z.A. (2006). Rapid Sintering of Ultrafine WC—Ni cermets . International Journal of Refractory Metals and Hard Materials , 24(3): 427—431.

10.

Khalil, A.K. and Kim S.W. (2006). Effect of Processing Parameters on the Mechanical and Microstructural Behavior of Ultra-Fine Al2O3—(ZrO 218%Mol Y2O3) Bioceramic, Densified By High-Frequency Induction Heat Sintering. Applied ceramic technology, 3(4): 322—330.

11.

Oh, D.Y. , Kim, H.C. , Yoon, J.K. and Shon, I.J. (2005). Simultaneous Synthesis and Consolidation Process of Ultra-fine WSi2—SiC and Its Mechanical Properties. Journal of Alloys and Compounds, 386(1—2): 270—275.

12.

Kim, H.C. , Oh, D.Y. and Shon, I.J. (2004). Sintering of Nanophase WC—15 vol.% Co hard metals by rapid sintering process. International Journal of Refractory & Hard Materials, 22(4—5): 197—203.

13.

Kim, H.C. , Oh, D.Y. , Jiang, G. and Shon, I.J. (2004). Synthesis of WC and Dense WC—5 vol.% Co hard materials by high-frequency induction heated combustion. Materials Science and Engineering A, 368(1—2): 10—17.

14.

Kim, H.C. , Shon, I.J. , Yoon, J.K. and Doh, J.M. (2006). Comparison of Sintering Behavior and Mechanical Properties Between WC—8Co and WC—8Ni Hard Materials Produced by High-frequency Induction Heating Sintering, Metals and Materials , 12(2): 141—146.

15.

Fleischer, J. , Masuzawa, T. , Schmidt, J. and Knoll, M. (2004). New Applications for Micro-EDM. Journal of Materials Processing Technology, 149(1): 246—249.

16.

Tam, C.Y. and Shek, C.H. (2004). Abrasive Wear of Cu60Zr30Ti 10 Bulk Metallic Glass. Materials Science and Engineering A, 384(1—2): 138—142.

17.

Lee, Y.Z. and Kim, B.J. (1999). The Influence of the Boundary Lubricating Conditions of Three Different Fluids on the Plastic Fatigue Related Mechanisms of Wear and Scuffing, Wear, 232(1): 116—121.