초록 ▼

A method of continuously manufacturing strips which include at least one thin porous conductive layer, said strips being intended in particular to form electrodes for fuel cells, in which method one stage in the manufacture of said layer includes passing powdered material to form it between the roll

A method of continuously manufacturing strips which include at least one thin porous conductive layer, said strips being intended in particular to form electrodes for fuel cells, in which method one stage in the manufacture of said layer includes passing powdered material to form it between the rolls of a calender. The method, said material is prepared by mixing an aqueous dispersion of carbon powder, which is possibly coated with a catalyst, with an emulsion of binder; precipitating the binder on the powder; drying and dry crushing the precipitate then wetting the powder while crushing is continued, with a liquid intended to prevent the grains from adhering to the rolls of the calender while lubricating said grains material thus obtained, being free from any pore-forming product, is calendered without using any support.

대표청구항 ▼

A method of making a porous strip for use in an electrode of a fuel cell, the method comprising: (a) mixing a balanced pH degassed aqueous dispersion of carbon powder with a balanced pH emulsion of a binder at a temperature below that at which spontaneous precipitation will occur; (b) precipitating

A method of making a porous strip for use in an electrode of a fuel cell, the method comprising: (a) mixing a balanced pH degassed aqueous dispersion of carbon powder with a balanced pH emulsion of a binder at a temperature below that at which spontaneous precipitation will occur; (b) precipitating the binder onto the carbon powder grains; (c) drying the precipitate of binder-coated carbon grains; (d) crushing the dried precipitate; (e) wetting the precipitate before the completion of step (g) with a lubricating liquid to provide a wetted powder of binder-coated carbon grains moistened sufficiently to prevent adherence of the powder to the rolls of a calender; (f) feeding the wetted powder, without support, into a calender; and (g) calendering the wetted powder into a self-supporting thin porous strip.