| 摘要 |
A porous electrode for a fuel cell is made by dusting nickel powder of a particle size of 65 to 75 microns into a dish-shaped plate and sintering without pressure at a temperature between 1325 DEG C. and 1350 DEG C. for an hour in hydrogen or a mixture of hydrogen and nitrogen. A second layer having finer pores is then produced on the first layer by painting on it a suspension in alcohol of nickel powder having a particle size of 4 to 5 microns and sintering at 1000 DEG C. for half an hour. In an alternative method of making the first layer, nickel particles of size 7 to 9 microns or 4 to 5 microns are mixed with ammonium bicarbonate of 100-240 mesh in the proportion of 1 part by weight of the bicarbonate to 3 to 5 parts of nickel. The mixture is pressed at 4,000 lbs. per square inch and then sintered at 1000 DEG C. to 1150 DEG C. for half an hour to 3 hours. The Provisional Specification describes modifications of the sintering processes in one of which the temperature at which the coarser nickel particles of 65 to 75 microns are sintered is reduced to 1150 DEG C. by sintering in an atmosphere of hydrogen and nitrogen which has been passed through hydrochloric acid. |
