Porous material for making tool-electrode and method of producing same
US4115623A · kind A · utility
Inventors
Key dates
| Filing date | Aug 25, 1976 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Aug 25, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12153
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.