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The physical and mechanical properties of Cu/Al2O3 composite synthesized by internal oxidation

Soleimanpour, A. M ; Sharif University of Technology

1866 Viewed
  1. Type of Document: Article
  2. Abstract:
  3. The internal Oxidation introduces a practical method for producing copper matrix composites reinforced by alumina particles. The mechanical and physical properties of alumina reinforced copper composites and alloy specimens were investigated. This experiment involves casting of Cu-Al alloys with 0.37, 1, 2 and 3 weight percent of aluminium in non-oxidizing atmosphere with pure oxygen free copper. The composite specimens produced after internal oxidation process at 950°C for 10 hours in sealed alumina crucible. The microstructures of composite specimens were studied after internal oxidation using SEM and AFM. The hardness and electrical resistivity tests were measured. The wear properties of Cu-Al and Cu/Al2O3 specimens were investigated by dry sliding pin-on-disk wear test according to ASTM G99-95a standard. The selected load for wear test was 40 N. The sliding speed was 0.5 m/s and sliding distances were 500, 1000 and 1500 m. The worn surfaces of specimens were examined to identify wear mechanisms. The results show that the hardness and wear properties of the composite specimens improved remarkably after internal oxidation, and the composite specimens show lower electrical resistivity compared to alloy specimens. The volume fraction of the composite had a straight relationship by wear resistance. Higher distances cause increase of volume loss. The main wear mechanisms of composite specimens were oxidative, delamination and abrasive wear
  4. Keywords:
  5. Cu/Al2O3 ; Abrasive wears ; AFM ; Alumina crucible ; Alumina particles ; Composite specimens ; Copper composites ; Copper matrix composite ; Cu-Al alloys ; Cu/Al2O3 ; Dry sliding ; Electrical resistivity ; Mechanical and physical properties ; Oxidizing atmosphere ; Physical and mechanical properties ; Pin-on-disk wear test ; Practical method ; Pure oxygen ; SEM ; Sliding distances ; Sliding speed ; Volume loss ; Wear ; Wear mechanisms ; Wear properties ; Wear test ; Weight percent ; Worn surface ; Alloys ; Alumina ; Copper ; Copper alloys ; Electric conductivity ; Hardness ; Mechanical properties ; Metallic matrix composites ; Oxygen ; Particle reinforced composites ; Tribology ; Wear of materials ; Wear resistance ; Internal oxidation
  6. Source: Materials Science and Technology Conference and Exhibition 2009, MS and T'09, 25 October 2009 through 29 October 2009, Pittsburgh, PA ; Volume 3 , 2009 , Pages 1806-1815 ; 9781615676361 (ISBN)
  7. URL: https://www.asminternational.org/home/-/journal_content/56/10192/CP2009MST1806/PUBLICATION