Chemistry: electrical and wave energy – Processes and products
Patent
1988-06-08
1990-04-24
Nguyen, Nam X.
Chemistry: electrical and wave energy
Processes and products
204 381, 20419215, 427250, 4272557, 4274431, 4274197, C25D 500, C23C 1600
Patent
active
049197738
ABSTRACT:
Erosion resistance is imparted to a metallic substrate without an attendant loss of fatigue life in the substrate in one embodiment by applying to the substrate a first ductile layer comprising a metal from Group VI to Group VIII elements as well as the noble metal group of elements, and a second hard erosion-resistant layer applied on the first layer comprising a boride, carbide, nitride or oxide of a metal selected from Group III to Group VI elements, the first layer capable of retaining substrate integrity and preventing diffusion of material from the second layer into the substrate. Another embodiment defines another layer of a substantially pure metal from Group III to Group VI between the first and second layers. Still another embodiment defines that in the second layer the content of either the carbide, nitride, boride or oxide is graded, i.e. the concentration of either the carbide, nitride, boride or oxide is greatest (higher) toward the top surface of the second layer, and decreases toward the bonding surface between the second and first layer.
REFERENCES:
patent: 3743551 (1973-07-01), Sanderson
patent: 3774703 (1973-11-01), Sanderson
patent: 3802078 (1974-04-01), Denes
patent: 4209375 (1980-06-01), Gates et al.
patent: 4619865 (1986-10-01), Keem et al.
Maissel et al., "Handbook of Thin Film Technology", McGraw-Hill Book Co., 1970, pp. 4-17 to 4-19.
Avco Corporation
Nguyen Nam X.
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