Patent ID: 8993917
Filing Date: 2015-03-31
Classification: B22F,B23H

Abstract:
1. A fabrication method of fabricating a porous electrode for spark surface modification employable for use of electric discharge energy to make a spark surface modification, the fabrication method comprising: a first fabrication step of filling a forming die with a powder of electrode material; a second fabrication step, following completion of the first fabrication step, of compressing the powder of electrode material filled in the forming die, to form a porous powder compact; a third fabrication step, following completion of the second fabrication step, of having the powder compact set in place in a chamber of a heat-treating furnace, and the chamber supplied with mixed gas containing inert gas as principal component and hydrogen gas; and a fourth fabrication step, following completion of the third fabrication step making the heated gas heated by a heater in the heat-treating furnace circulate in the chamber to generate the convection flows, heating the powder compact with the convection flows of the heated gas, and thereby sintering the electrode material of the powder compact by making the heated gas pass through the powder compact, wherein the fourth fabrication step comprises: evaporating wax mixed in the powder compact for removal of the wax; and blowing the heated gas toward the powder compact sufficiently for the heated gas to penetrate the powder compact, thereby heating the inside of the powder compact.