| 摘要 |
PROBLEM TO BE SOLVED: To improve gas insulating performance, toughness, and strength by providing a conductive gas insulating layer on a conductive layer conductive formed by binding and solidifying fibers with a synthetic resin. SOLUTION: Preferably, a separator has a three-layered structure sandwiching a conductive gas insulating layer (layer B) with conductive layers (layers A). A pitch type carbon fiber superior in the corrosion resistance and conductivity is preferable for the conductive fiber forming the layers A and above all, opened carbon fibers with curved shape is preferable from the viewpoint of the uniformity of the entanglement. A polyphenylene sulfide resin is preferable for the synthetic resin for binding the conductive fiber in the layer A from the viewpoint of corrosion resistance and heat resistance. The content of the conductive fiber in the layer A is preferably 20-80 wt.%. And expansion graphite sheet is preferable for the layer B from the viewpoint of the cost and the resistance to the fuel gas. Preferably, the thickness ratio of the layer A to the layer B is set to the thickness of the layer A/the thickness of the layer B =90/10-20/80. |
