| 摘要 |
1,237,934. Gas diffusion electrodes. BATTELLE-INSTITUT e.V. 13 Sept., 1968 [16 Sept., 1967], No. 43638/68. Heading H1B. Gas diffusion electrodes are made by forming a first layer of powder containing a powdered, porous carbon, a powdered pore forming agent, and a powdered thermoplastic resin, forming in contact therewith a second, thin layer of thermoplastic resin powder which contains no powdered carbon, placing in contact with the second layer a porous sheet of P.T.F.E. heating the superimposed layers to a temperature above the melting point of the resin(s) thereby to fuse the resin particles in the first and second layers and to bond the compact so formed to the P.T.F.E. sheet, and removing the poreformer. The first layer may be compacted by pressing before the formation of the second layer which may optionally contain a pore-former and the P.T.F.E. sheet may be formed in situ by forming a third layer consisting of P.T.F.E. particles on said second layer before the heating operation. The thermoplast may be polyethylene, P.T.F.E., or polytrifluorchloroethylene. The pore-former may be a water-soluble salt removable by leaching, or it may be volatile or decomposable by heat to gaseous products and removable by heating. |
