Mechanically Alloyed and Spark Plasma Sintered Aluminium/Precious Metal Oxide Composite Materials

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Air-atomised pure aluminium powder with additions of 10 at.% of AgO, PtO2 or PdO was mechanically alloyed (MAed) by using a vibrational ball mill, and MAed powders were consolidated into bulk materials by a spark plasma sintering (SPS) process. Mechano-chemical reactions among pure Al, precious metal oxide and stearic acid, added as a process control agent, during the mechanical alloying (MA) process and subsequent heat treatments were investigated by X-ray diffraction. The mechanical properties of MAed powders obtained under various heat treatment conditions and those of the SPS materials were evaluated by hardness tests. Mechano-chemical reactions occurred in Al/precious metal oxide composite powders during 36 ks of the MA process to form AlAg2, Pt and Al3Pd2 for the Al-AgO, Al-PtO2 and Al-PdO systems, respectively. Further solid-state reactions in MAed powders have been observed after heating at 373 K to 873 K for 7.2 ks. The hardness of MAed powders initially increased significantly after heating at 373 K and then generally decreased with increasing heating temperatures. The full density was obtained for the SPS materials under the conditions of an applied pressure of 49 MPa at 873 K for 3.6 ks. All the SPS materials exhibited hardness values of over 200 HV in the as-fabricated state.

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Periodical:

Materials Science Forum (Volumes 638-642)

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Edited by:

T. Chandra, N. Wanderka, W. Reimers , M. Ionescu

Pages:

1824-1829

Citation:

M. Kubota and P. Cizek, "Mechanically Alloyed and Spark Plasma Sintered Aluminium/Precious Metal Oxide Composite Materials ", Materials Science Forum, Vols. 638-642, pp. 1824-1829, 2010

Online since:

January 2010

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$38.00

[1] L. Lu, M. O. Lai: Mechanical Alloying, Kluwer Academic Publishers, New York (1998).

[2] B. S. Murty, R. Ranganathan: International Material Reviews Vol. 43 (1998), P. 101.

[3] C. Suryanarayana: Progress in Materials Science Vol. 46 (2001), P. 1.

[4] D. G. Kim, J. Kaneko, M. Sugamata: Materials Transactions, JIM Vol. 36 (1995), P. 305.

[5] L. Blaz, J. Kaneko, M. Sugamata, R. Kamei: Materials Science and Engineering A, A349 (2003), P. 111.

[6] P. G. McCormick: Material Transactions, JIM Vol. 36 (1995), P. 161.

[7] M. Tokita: Materials Science Forum Vol. 308- 311 (1998), P. 83.

[8] M. Omori: Materials Science and Engineering A, A287(2000), P. 183.

[9] M. Kubota, J. Kaneko, M. Sugamata: Journal of Metastable and Nanocrystalline Materials Vol. 24 (2005), P. 279.

[10] M. Kubota: Journal of Alloys and Compounds Vol. 434 - 435 (2007), P. 294.

[11] M. Kubota, P. Cizek, W. M. Rainforth: Composite Science and Technology Vol. 68 (2008), P. 888.

[12] M. Kubota, J. Kaneko, M. Sugamata: Materials Science and Engineering A, A475 (2008).

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