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Evaluation of ceramic/ceramic joint interface prepared via brazing

Ghazi Daryani, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. Recent investigations show that ceramic/ceramic joints have high potential for applications in industry. Cost and difficulty in manufacturing complex components, either in one step or by joining of ceramic-metal and ceramic-ceramic, have inhibited more widespread use. It is important to know how to join components without problems and to understand the role of the interface as the main factor controlling the properties in these joints. The purpose of this paper was to investigate the joining of two ceramics with metal fillers (SiC to SiC and Al2O3 to Al2O3) and to investigate the interface of SiC/SiC and Al2O3/Al 2O3 with the same metal interlayer (Ag-Cu-Ti) and the effects on the properties. The results showed that the optimum joining of Al2O3/Al2O3 and SiC/SiC was obtained by applying a metal layer of Ag-Cu as well as an active metal of Ti-6Al-4V. The second filler was used to increase the wet ability and improve strength. Microscopic investigations revealed penetration and activation of elements from the interface to the bulk of ceramic body and that this was the major reaction in the joints. Both joints showed the deepest penetration of Ti atoms from interface into the ceramics. According to the XRD results, TiC and Ti 5Si3 were the most important phases in the SiC/SiC interface and TiO and V2O5 in the Al2O 3/Al2O3 interface. The strength of both joints increased until an optimum time and temperature condition was reached and diminished after that by forming of other phases which inhibited the formation of a stronger interface. The optimum time and temperature were suggested to be 900°C and 90 min for SiC/SiC and 900°C and 60 min for Al 2O3/Al2O3
  4. Keywords:
  5. Ceramic/ceramic joints ; EDAX ; Interface ; SEM ; Ceramic bodies ; High potential ; Joint interfaces ; Manufacturing complex ; Metal interlayers ; Strength ; Temperature conditions ; XRD ; Ceramic materials ; Energy dispersive spectroscopy ; Fillers ; Interfaces (materials) ; Joining ; Metals ; Phase interfaces ; Scanning electron microscopy ; Silicon carbide ; Silver ; Silver alloys ; Surfaces ; Aluminum
  6. Source: Materials Forum, 18 October 2011 through 20 October 2011 ; Volume 35 , October , 2011 , Pages 20-30 ; 08832900 (ISSN) ; 9781876855369 (ISBN)
  7. URL: http://konference.tanger.cz/data/metal2011/sbornik/lists/papers/786.pdf