Structure and phase transformation behaviour of electroless Ni-P composite coatings

Journal Article · Thu Apr 13 00:00:00 EDT 2006 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2005.09.024· OSTI ID:20891669

Balaraju, J N ^[1]; Seshadri, S K ^[2]

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1. Surface Engineering Division, National Aerospace Laboratory, Bangalore 560017 (India)
2. Department of Metallurgical Engineering, Indian Institute of Technology Madras, Chennai 600036 (India)

This paper addresses the structural characteristics and phase transformation behaviour of plain electroless Ni-P coating and electroless Ni-P-Si{sub 3}N{sub 4}, Ni-P-CeO{sub 2} and Ni-P-TiO{sub 2} composite coatings. The X-ray diffraction patterns of electroless Ni-P-Si{sub 3}N{sub 4}, Ni-P-CeO{sub 2} and Ni-P-TiO{sub 2} composite coatings are very similar to that of plain electroless Ni-P coating, both in as plated and heat-treated conditions. Selected area electron diffraction (SAED) patterns obtained on the Ni-P matrix of Ni-P-Si{sub 3}N{sub 4}, Ni-P-CeO{sub 2} and Ni-P-TiO{sub 2} composite coatings exhibit diffuse ring patterns resembling the one obtained for plain electroless Ni-P coating. Phase transformation behaviour studied by differential scanning calorimetry (DSC) indicates that the variation in crystallization temperature and the energy evolved during crystallization of plain electroless Ni-P coating and electroless Ni-P-Si{sub 3}N{sub 4}, Ni-P-CeO{sub 2} and Ni-P-TiO{sub 2} composite coatings is not significant. The study concludes that incorporation of Si{sub 3}N{sub 4}, CeO{sub 2} and TiO{sub 2} particles in the Ni-P matrix does not have any influence on the structure and phase transformation behaviour of electroless Ni-P coatings.

• OSTI ID: 20891669
• Journal Information: Materials Research Bulletin, Vol. 41, Issue 4; Other Information: DOI: 10.1016/j.materresbull.2005.09.024; PII: S0025-5408(05)00370-3; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALORIMETRY
CERIUM OXIDES
CHEMICAL PREPARATION
COATINGS
CRYSTAL STRUCTURE
CRYSTALLIZATION
ELECTRON DIFFRACTION
HEAT TREATMENTS
MATRICES
NICKEL
POTASSIUM
RINGS
SILICON NITRIDES
TITANIUM OXIDES
X-RAY DIFFRACTION