Effect of heat-treatment on properties of electroless-deposited nickel-molybdenum-phosphorus alloy films

Journal Article · Tue Mar 01 00:00:00 EST 1988 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2095730· OSTI ID:6896212

Koiwa, I; Usuda, M; Yamada, K; Osaka, T

The film properties and the heat change properties of new electroless plated Ni-Mo-P alloy films, which were deposited from a newly developed simpler bath with direct addition of Na/sub 2/MoO/sub 4/, were investigated as a basis for developing new functional thin film. Both amorphous and crystallized Ni-Mo-P alloy films were prepared by simply controlling the Na/sub 2/-MoO/sub 4/ concentration in the baths. The maximum molybdenum content of 14.9 atom percent (22.3 weight percent) was attained at a Na/sub 2/MoO/sub 4/ concentration of 0.020 mol dm /sup -3/, and the films having high resistivity and high thermal stability were obtained. The formation of solid solution between Ni matrix and codeposited Mo was indicated on the basis of comparison with bulk Ni-Mo alloy. The amorphous Ni-Mo-P alloy film had much better thermal stability than did the amorphous Ni-P alloy film. In the case of crystallized Ni-Mo-P alloy film, the small grain size of electroless Ni-Mo-P alloy film was maintained even after heat-treatment up to 400/sup 0/C. The crystallization process of the amorphous and crystallized Ni-Mo-P alloy films by heat-treatment was quite different from that of an ordinary electroless Ni-P alloy film. Three structural changes resulting from heat-treatment were observed in electroless Ni-Mo-P alloy films, namely, The formation of Ni/sub 3/P, the crystallization of Ni-Mo alloy, and the transformation of Ni-Mo alloy. A schematic model of Ni-Mo-P alloy films composed of two phases or zones, namely, the Ni-Mo and Ni-Mo-P, was proposed to explain the heat change properties of Ni-Mo-P alloy films.

• Research Organization: Dept. of Applied Chemistry, School of Science and Engineering, Waseda Univ., Okubo, Shinjuku-ku, Tokyo 160 (JP)
• OSTI ID: 6896212
• Journal Information: J. Electrochem. Soc.; (United States), Vol. 135:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MOLYBDENUM ALLOYS
TEMPERATURE EFFECTS
NICKEL ALLOYS
DEPOSITION
FABRICATION
HEAT TREATMENTS
HIGH TEMPERATURE
MATHEMATICAL MODELS
MOLYBDENUM OXIDES
PHOSPHORUS
PROCESS SOLUTIONS
SODIUM OXIDES
STRUCTURAL CHEMICAL ANALYSIS
THERMODYNAMIC PROPERTIES
THIN FILMS
ALKALI METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
DISPERSIONS
ELEMENTS
FILMS
MIXTURES
MOLYBDENUM COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SODIUM COMPOUNDS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
360104* - Metals & Alloys- Physical Properties
360101 - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies