PRODUCTION OF METAL PRODUCTS FROM THEIR ORES BY REDUCTION AND SINTERING

摘要

1300558 Production of sintered metal strip NATIONAL RESEARCH DEVELOPMENT CORP 8 April 1970 [15 April 1969 15 Oct 1969] 19172/69 and 50688/69 Heading C7D Sintered metal strip is formed from "green" strip of a reducible metal compound which is sufficiently self supporting to be passed through a furnace for reduction of the compound and sintering of the metal. The compound may be an oxide or chloride of Fe, Cu or Ni which may be bound with a cellulose derivative, phenol formaldehyde, thermosetting resins, heavy oils, FeCl 3 optionally with water or an organic liquid. The green strip may be flash sintered in a reducing atmosphere to form a surface supporting layer or preferably a layer of metal powder 3-20% of the total strip thickness is distributed over the surface of the green strip prior to flash sintering. Alloying additions e.g. Ni as oxide, Fe-Mn, fibres and C may be added to a slurry of the powder compound and binder and the strip may be formed by extruding or rolling. For rolling, the Fe 3 O 4 or Fe 2 O 3 slurry is deposited on a steel band 1a coated with a releasing agent, dried at 3 and a layer of Fe powder is applied at 4. After drying and polymerising the resin binder at 5 the strip is stripped from the band and hot rolled at 7, flash sintered at 10 at 1100‹C in H 2 and finally reduced and sintered at 100-1200‹C in 14. Prior to hot rolling at 20 a layer of Fe on another metal may be placed on the strip to form a composite strip.