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Alumina - copper eutectic bond strength: Contribution of preoxidation, cuprous oxides particles, and pores

Ghasemi, H ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. Publisher: 2009
  3. Abstract:
  4. The influences of cupric oxide layer thickness, cuprous oxide particles, and pores on mechanical properties and microstructure of alumina-copper eutectic bond have been investigated. The furnace atmosphere in the first stage was argon gas with 2 × 10-6 atm oxygen partial pressure. In the second stage, the furnace atmosphere was same as the first stage unless that in cooling between 900-1000 °C, the hydrogen gas was purged in furnace atmosphere. Finally, in the last stage a vacuum furnace with 5 × 10 -8 atm pressure was chosen for bonding procedure. Peel strength of first stage specimens shows that cupric oxide layer with 320 ± 25 nm thick generates the maximum peel strength (13.1 ± 0.3 kg/cm) in joint interface. In the second stage, by using the hydrogen gas, a joint interface free of any cuprous oxide particle was established. In this case, engrossingly the joint strength has increased to 17.1 ± 0.2 kg/cm. Finally, the bonding process in vacuum furnace indicates that the furnace gas does not have considerable effect on joint interface pores. Furthermore, bonding process in vacuum furnace reduces the peel strength of joint due to formation of more pores. Thorough study of pores formation is presented. © Institute of Materials Engineering Australasia Ltd
  5. Keywords:
  6. Alumina-copper ; Argon gas ; Bonding procedure ; Bonding process ; Cupric oxide ; Cuprous oxide ; Furnace atmosphere ; Hydrogen gas ; Joint interfaces ; Joint strength ; Last stage ; Oxygen partial pressure ; Peel strength ; Preoxidation ; Properties and microstructures ; Alumina ; Argon ; Bond strength (materials) ; Bonding ; Copper ; Copper oxides ; Eutectics ; Furnaces ; Hydrogen ; Internet protocols ; Mechanical properties ; Phase interfaces ; Solar control films ; Surface treatment ; Vacuum ; Vacuum furnaces
  7. Source: 16th International Federation for Heat Treatment and Surface Engineering Congress, Brisbane, QLD, 30 October 2007 through 2 November 2007 ; Volume 32 , 2007 , Pages 90-97 ; 08832900 (ISSN)
  8. URL: http://scientiairanica.sharif.edu/article_3214.html