Manufacture of separator with grooves for fuel cell

Abstract

Abstract PURPOSE:To obtain a separator with grooves for fuel cell whose expansion graphite filling ability to ribs is high and non-permeability is good by stacking expansion graphite sheets prepared by press-molding expansion graphite having different expansion rates, and press-molding them. CONSTITUTION:A high-expansion graphite sheet is preferably prepared by continuously press-molding expansion graphite having an expansion rate of 100- 500 times with a roller. A low-expansion graphite sheet is preferably prepared by continuously press-molding expansion graphite having an expansion rate of 5- 50 times with a roler. To mold a separtor, low expansion sheets 2 are arranged on both sides of a high-expansion graphite sheet 1, or after low-expansion sheets are arranged on both sides of a high-expansion graphite sheet, high-expansion graphite sheets are arranged outside the low-expansion sheets. These stacked expansion graphite sheets are placed into a die and pressed at a pressure of 150-600kg/cm<2> with a punch having grooves to mold a separator with grooves.

Inventors

• 👤 Atsushi Fujita
• 👤 淳 藤田
• 👤 Kazuo Yamada
• 👤 和夫 山田
• 👤 Yoshihiro Kikuchi
• 👤 菊池　好洋

Bibliographic Details