Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1989-08-14
1990-10-23
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
419 11, 419 19, 419 23, 419 32, 419 36, 419 38, 419 54, 419 57, 75243, C22C 2912
Patent
active
049649078
ABSTRACT:
A process is provided for the production of a sintered body. The process includes the following consecutive steps: (i) mixing and kneading one or more metal powders and/or one or more alloy powder with a binder into a compound, said metal and alloy powders having an average particle size not greater than 30 .mu.m, (ii) injection-molding the compound into a green body; (iii) debinding the green body to form a debound body; and (iv) subjecting the debound body to first-stage sintering at 1,050.degree.-1,250.degree. C. in a reducing or reduced-pressure atmosphere and then to second-stage sintering at a temperature in a range of 1,100.degree.-1,400.degree. C. which is higher than that of the first-stage sintering. This process can provide sintered Ti bodies and sintered magnetic bodies of the Fe-Si type, which have a density ratio of at least 95%.
REFERENCES:
patent: 4478790 (1984-10-01), Huther et al.
patent: 4721599 (1988-01-01), Nakamura
Abstract of Papers, Spring Meeting of Japan Society of Power and Powder Metallurgy, 1988 (pp. 126-127).
Sintering Behavior, Mechanical and Magnetic Properties of Sintered Fe-Si Materials, The International Journal of Power Metallurgy & Powder Technology, vol. 20, No. 4, 1984, American Powder Metallurgy Institute.
Kiyota Yoshisato
Ohta Junichi
Ohtsubo Hiroshi
Takajo Shigeaki
Bhat Nina
Kawasaki Steel Corp.
Lechert Jr. Stephen J.
Miller Austin R.
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