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Powder metallurgy of raney nickel.
O'Hare-SA; O'Brien-WL; Worthington-RB; Mauser-JE
Albany OR: U.S. Department of the Interior, Bureau of Mines, RI 8182, 1976 Jan; :1-12
Powder metallurgy processing of commercial raney nickel powders was examined. The typical angular particle shape, in conjunction with aluminum present in a eutectic phase, facilitated interlocking leading to excellent green strength after compaction. Density and porosity as influenced by the compacting pressure were studied over the range of 37.5 to 207 meganewton per square meter (mn/m2). Sintering in an inert atmosphere from 575 deg to 850 deg C caused a volume increase which is attributed to a solid-state reaction between al and Ni2Al3 phases. The reaction is 3Al + Ni2Al3->2NiAl3. A thermal pretreatment of 70 hours at 700 deg C was required to prevent this reaction from occurring during sintering. Density and porosity as a function of compacting pressure and sintering temperature were determined after a thermal pretreatment of the powder.
Metallurgical-processes; Metallurgy; Metals; Mineral-processing
IH; Report of Investigations
NTIS Accession No.
Albany OR: U.S. Department of the Interior, Bureau of Mines, RI 8182
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