On characterisation of wire-arc-plasma-sprayed Ni on alumina substrate
- Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)
- Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)
A study was carried out on metal-ceramic bonding produced by the technique of wire-arc-plasma spraying of Ni on Al{sub 2}O{sub 3} substrate. The Ni layer and the Ni/Al{sub 2}O{sub 3} interface were characterised using optical and electro-optic techniques. The plasma-deposited Ni layer shows a uniform lamellar microstructure throughout the cross-section. The metal-ceramic interface was found to be well bonded with no pores, flaws or cracks in the as-sprayed condition. The optical metallography and concentration profiles established with the help of an electron probe microanalyser confirmed the absence of any intermediate phase at the interface. An annealing treatment at 1273 K for 24 h on the plasma-coated samples did not result in formation of any intermetallic compound or spinel at the Ni/Al{sub 2}O{sub 3} interface. This indicates that the oxygen picked up by Ni during the spraying operation is less than the threshold value required to form the spinel NiAl{sub 2}O{sub 4}.
- OSTI ID:
- 20748762
- Journal Information:
- Materials Characterization, Vol. 55, Issue 2; Other Information: DOI: 10.1016/j.matchar.2005.04.001; PII: S1044-5803(05)00106-3; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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