Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1976-08-25
1978-09-19
Hunt, Brooks H.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
29 2517, 75211, 75221, 75222, 75226, B22F 300
Patent
active
041156234
ABSTRACT:
The porous material adapted for making a tool-electrode therefrom features the porosity up to 15 - 25 percent of its volume, pore size within 10 to 40 microns and oxygen content up to 0.1 wt.%.
The method proposed for producing such a material resides in hot compression moulding of a powdery electrode material. The powdery material is first heated in a compression mould to a temperature equaling 0.3 to 0.5 of the melting temperature in degrees centigrade 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 temperature, while continuing to feed said reducing gas in a quantity exceeding the stoichiometric one. Next the powdery material is heated to a temperature in degrees centigrade equal to 0.6 to 0.9 of the melting temperature, and a pressure is applied thereto to obtain the required porosity of the material being prepared.
REFERENCES:
patent: 2789901 (1957-04-01), Shipe et al.
patent: 3638293 (1972-02-01), Peterson
patent: 3980445 (1976-09-01), Aleshin et al.
Levit Maxim Lvovich
Padalko Oleg Vadimovich
Voinov Nikolai Vasilievich
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