Abstract
Research was done on carbon fiber surface treatment techniques on boundary-bonding state and properties of short carbon fiber reinforced phenol formaldehyde (PF) resin/graphite composite. By gas-phase oxidative surface treatment (GPOST)、gas-phase and liquid-phase oxidative surface treatment (GLPOST), carbon fiber and PF resin /graphite matrix is on weak boundary bonding state. The exerted outside stress can not be effectively transmitted, the composite strength is lower than that of PF resin/graphite matrix; By thick nitric acid liquid-phase oxidative surface treatment (TNALPOST) which the nitric acid has high density, fiber and matrix is on relatively weak boundary bonding state, the exerted outside stress can be effectively transmitted and composite strength can be raised on some degree. With carbon fiber content by TNALPOST 3.wt%~ 4.wt% and PF resin content 15.wt%, the composite can meet both the mechanical strength and electrical conductivity requirement on carbon filler/polymer bipolar plate by USA Department of Energy.
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