| 摘要 |
Block fuel element for high temperature reactors are produced by hot molding of a granulated graphite material consisting of natural graphite powder, synthetic graphite powder, phenolformaldehyde binder resin and stearic acid as a lubricant together with fissile and fertile coated fuel particles to a hexagonal block shape with cooling channels for helium gas and subsequent heat treatment of the molded block to a max. temperature of about 2000 DEG C. In order to displace the air from the die, an organic compound (air displacement agent) e.g., hydrocarbon, alcohol, phenol, aldehyde, ketone ether of amine is built into the granulated graphite material having a very low vapor pressure at room temperature which increases to about 760 Torr at molding temperature of about 180 DEG C and condensed into a liquid phase while the forming pressure is applied.
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