| 摘要 |
1,267,992. Cemented chromium carbide. GENERAL ELECTRIC CO. April 25, 1969 [May 1, 1968], No.21258/69. Headings C7A and C7D. A hard cemented carbide alloy consists, by weight, of Ni (up to 1/3 rd replaceable by Mo or W) 1-35% The alloy may be made by (1) mixing chronium carbide powder, Ni powder and a source of P, the latter for example being in the form of Ni-P alloy, ammonium phosphate, or a P anhydride (in the case of the compounds, combined oxygen is expelled by reduction or dissociation before sintering), (2) ball milling in e.g. acetone, (3) drying in a protective atmosphere e.g. hydrogen (4) adding paraffin, (5) pressing e.g. at 15 tsi (6) heating at 450‹C. in e.g. hydrogen, and (7) sintering in e.g. vacuo at 1200‹-1300‹C. |
