C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/157, 75/4
C22C 1/08 (2006.01) B22F 3/14 (2006.01) B22F 5/00 (2006.01) B23H 1/04 (2006.01)
Patent
CA 1090166
ABSTRACT OF THE DISCLOSURE The porous material adapted for making a tool-electrode therefrom features a porosity up to 15 - 25 per cent of its volume, a pore size within 10 to 40 microns and ?? oxygen con- tent up to 0.1 wt.%. The method proposed for producing such a material resides in hot compression moulding of a powdery elec- trode material. The powdery material is first heated in a com- pression mould to a temperature equalling 0.3 to 0.5 that of the melting temperature while pumping a gaseous reducing agent therethrough at a pressure of 1.2 - 1.8 atm, whereupon the powdery material is held for some lapse of time at that temper- ature, while continuing to feed said reducing gas in a quantity exceeding the stoichiometric one. Next, the powdery material is heated to a temperature equal to 0.6 to 0.9 that of the melt- ing temperature, and a pressure is applied thereto to obtain the required porosity of the material being prepared.
259169
Levit Maxim L.
Padalko Oleg V.
Voinov Nikolai V.
Experimentalny Nauchno-Issledovatelsky Institut Metallorezhuschi
Swabey Ogilvy Renault
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