| 摘要 |
PURPOSE:To provide a fuel cell electrode material which has a greatly enhance strength and long life and does not undergo cracks or the like under the influence of heat, by making a nickel powder with short nickel fibers. CONSTITUTION:A nickel powder 1 and short nickel fibers 2 of 20-30mum in diameter and 2-20 in aspect ratio (L/D) each are mixed with each other and sintered together to constitute a fuel cell electrode material. Although the diameter of each grain of the nickel powder 1 is selected in terms of the properties (pore diameter and porosity ratio) of the electrode material, it is preferable that the diameter is 0.5-50mum. If the diameter of each of the short fibers 2 were less than 2mum, an electrolyte would not sufficiently enter into the material and the reinforcement thereof would not be enough. If the aspect ratio were less than 2, the nickel fibers 2 would become almost powdery to make it difficult to attain a porosity ratio required for the electrode material and would not perform a reinforcing function. If the aspect ratio were more than 20, it would be difficult to uniformly disperse the nickel fibers 2 and it would be likely to make the strength of the electrode material nonuniform. |
