On the Mechanical Properties of Cooper–Al2O3 Cermets of a Low Reinforcing Level, Processed by Powder Metallurgy

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There is investigated the influence of Al2O3 content on the density and mechanical properties of Cu-Al2O3 (2.0 ÷ 10.0 [vol.%] Al2O3) cermets processed by classical routes of powder metallurgy. The obtained results show that the cermets relative density remains quite constant, at a value of over 95 [%], up to a content of ~4 [vol.%] Al2O3. Together with reinforcing effect of the hard Al2O3 particles, proved by the apparition of an elastic zone on the Stress-Strain curve of tensile test, determine a notable increasing of ultimate tensile strength (UTS) and hardness with a small variation of elongation. Over about 4÷5 [vol.%] Al2O3, a decrease in UTS and also in toughness, proved by the Fracture energy decreasing, occurs. Consequently, from the considered points of view, is not recommended to adopt higher reinforcing levels. For electrical applications, the relative density of the processed cermets can be further increased with 3 ÷ 4 [%] by die cold repressing.

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Periodical:

Edited by:

Ionel Chicinaş and Traian Canta

Pages:

131-134

Citation:

L. N. Mîtcă and R. L. Orban, "On the Mechanical Properties of Cooper–Al2O3 Cermets of a Low Reinforcing Level, Processed by Powder Metallurgy", Advanced Materials Research, Vol. 23, pp. 131-134, 2007

Online since:

October 2007

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$38.00

[1] Report of Task Group B Cermets, ASTM Comm. C-21, In ASM Handbook, Vol. 7, (1998), p.798.

[2] Van Schoick, E.C., E d., Ceramic Glossary, Ed. The Ceramic Society, Columbus, OH, (1963).

[3] M. Besterci, K. Sülleiová and P. Kulu: Engineering, Estonian Acad. of Sc., Vol. 9/4 (2003), p.246.

[4] K. Sato, K. Maeda, I. Tanaka, T. Ohnishi, T. Takayama, U.S. Patent 7, 056, 598 (2006).

[5] POMETON SPA, Metal Powders and Granules, Product Catalog, Venice, Italy (2005).

[6] Information on http: /www. goodfellow. com.

[7] R. M. German: Powder Metallurgy and Particulate Materials Processing, MPIF Ed. (2005). Fig. 4. Stress-Strain curves for the processed cermet with 6 [vol. %] Al2O3.

[5] [10] [15] [20] [25] [30] 0246810 Al2O3 content, [vol. %] Fracture energy, Fe [J].

[10] [20] [30] [40] [50] [60] [70] Hardness, HRG Fracture energy Hardness Fig. 5. Fracture energy and harness plot vs. Al2O3 content of the processed cermets.