An electroless Ni-Zr-P composite film and a Ni-Nb-P composite film were plated and their heat-treating behaviors were investigated. The addition of 20 g dm-3 of metallic powder resulted in a composite film that contained 21.2 weight percent (w/o) of Zr, [13.8 atom percent (a/o)], or 4.8 w/o of Nb, (2.9 a/o), respectively. Both metallic powders were dispersed uniformly throughout the films. The metallic Ni formed by the crystallization of the Ni-P matrix diffused into the metallic powders, and the amorphous Ni-Zr and Ni-Nb phases were formed by heat-treatment at 500° or 300°C. Some parts of the amorphous Ni-ZR phases and the metallic Ni phases combined to form intermetallic compounds by heat-treatment at 600°C. The nickel-rich parts of the amorphous Ni-Nb phase were converted into a metastable Ni-Nb phase (η phase) or a Ni-Nb solid solution by heat-treatment at 700°C. The longer heating time at 400°C increased the amount of the Ni-Zr amorphouse phase: however, it decreased the reactivity of the amorphous Ni-Zr phase. The same heat-treatment of 400°C did not give the considerable change on the amorphous Ni-Nb phase.
|Number of pages||5|
|Journal||Journal of the Electrochemical Society|
|Publication status||Published - 1989 Apr|
ASJC Scopus subject areas
- Surfaces, Coatings and Films
- Surfaces and Interfaces