| 摘要 |
PURPOSE:To prevent weakening of a nickel sintered body caused by corrosion by an acidic solution and improve battery performance by passing a heated sintered substrate through a mixed gas containing oxygen and forming an acid resistant nickel oxide layer on the sintered substrate. CONSTITUTION:A sintered substrate (porosity is 80%) obtained by sintering carbonyl nickel powder by a usual method is passed through a mixed gas of oxygen and nitrogen (the volume ratio is 1:1) for about five minutes when its temperature is high (about 600-700 deg.C) immediately after sintering to form an acid resistant nickel oxide layer on its surface. The temperature inside the sintered substrate is uniform immediately after sintering, and a nickel oxide layer is formed uniformly in the surface and the inside of the sintered substrate. Consequently, weakening of the nickel sintered body caused by corrosion by an acidic solution is prevented, and battery performance is improved. |
