Compositions: coating or plastic – Coating or plastic compositions – Tractive or friction surface
Patent
1993-07-29
1996-01-23
Bonner, C. Melissa
Compositions: coating or plastic
Coating or plastic compositions
Tractive or friction surface
75503, 75504, 75505, 75235, 75234, C09K 314, C22B 518
Patent
active
054862299
ABSTRACT:
A raw material for producing ferrite dust for friction elements and a method of producing reduced ferrite dust, capable of using, as the raw material, various collected sludge and dust which are by-products obtained at iron factories. The sludge has solid components consisting essentially of 35 to 50% total Fe, no more than 2% metallic Fe, 1.0 to 8.0% SiO.sub.2, 0.3 to 2.5% MgO, 1.0 to 6.0% CaO, 1.0 to 5.0% Al.sub.2 O.sub.3, 20 to 40% fixed carbon, and 0.1 to 1.0% ZnO, said sludge having a grain size of 20 to 250 mesh, an apparent specific gravity of 1.2 to 2.0 g/cc, a real specific gravity of 3.3 to 4.3 g/cc, and a porosity of 40 to 65%. The collected dust consists essentially of 50 to 85% true Fe, 20 to 55% FeO, 30 to 55% Fe.sub.3 O.sub.4, 2 to 12% CaO, 1 to 5% SiO.sub.2, 1 to 3% MgO, 1 to 3% MnO, and no more than 1% fixed carbon, 50 to 85% total Fe, 2 to 12% CaO, 1 to 5% SiO.sub.2, 1 to 3% MgO, 1-3% MnO, and no more than 1% fixed carbon. The sludge is treated under reduction conditions of a reduction gas charge rate of 8 to 20 Nl/min., a reduction temperature of 1,000.degree. to 1,200.degree. C., a reduction time of 20 to 60 minutes and a reduction gas-to-solid material ratio of 0.5 to 2.5 and then annealed at an annealing temperature of 650.degree. to 800.degree. C.
REFERENCES:
patent: 3015553 (1962-01-01), Johnson
patent: 3067493 (1962-12-01), Sampson
patent: 3101527 (1963-08-01), Weinman et al.
patent: 3191278 (1965-06-01), Kendall et al.
patent: 3361557 (1968-01-01), Babcock et al.
patent: 3434998 (1969-03-01), Aldrich et al.
patent: 3437458 (1969-04-01), Volker et al.
patent: 3494774 (1970-02-01), Bray
patent: 3663497 (1972-05-01), Ninomiya et al.
patent: 3751241 (1978-08-01), Sloughfy et al.
patent: 4051097 (1977-09-01), Aldrich
patent: 4182437 (1980-01-01), Roberts et al.
patent: 4280935 (1981-07-01), Ogiwara
patent: 4438004 (1984-03-01), Myers
patent: 5196620 (1993-03-01), Gustin et al.
Bonner C. Melissa
Kumsan Material Co., Ltd.
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