Phase separated composite materials

Details Phase separated composite materials Phase separated composite materials

1990-11-15

1992-10-27

Hunt, Brooks H.

Wheel substitutes for land vehicles

Stepper type

505731, 505816, 20419215, 20419224, 428548, 428551, 428553, 428558, 428559, 428554, H01B 1202, H01L 2700, C23C 1434, B22F 704

Patent

active

051589338

ABSTRACT:
A method of forming a phase-separated composite material which utilizes sputtering in a thermal gradient at relatively high sputtering pressures generally above about 0.1 Torr sufficient to produce nanoscale particles which are embedded in a continuous phase matrix produced by normal sputtering. This method avoids the alloying and/or compound formation which prevents preparation of phase-separated composites by conventional co-sputtering, and the invention thus enables particulate composites to be formed from entirely new classes of materials. Microhardness testing shows that the phase-separated composites produced by the present invention have an increased hardness compared to the pure matrix material.

REFERENCES:
patent: 3655544 (1972-04-01), Rairden, III
patent: 4349425 (1982-09-01), Miyake et al.
patent: 4484995 (1984-11-01), Pirich et al.
patent: 4496450 (1986-01-01), Hitotsuyanagi et al.
Holtz, et al., Enhanced magnetic anisotropy at the percolation threshold of Fe-SiO.sub.2 composite thin films, Dec. 19, 1989, pp. 943-945.
Chow, et al., Alternative approach to nanocomposite syntheis by sputtering, Appl. Phys. Lett., vol. 56, No. 19 Feb. 27, 1990, pp. 1953-1955.
Granqvist et al., "Ultrafine Metal Particles", J. Appl. Phys., vol. 47, No. 5 pp. 2200-2219 (1976).

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