Plastic article or earthenware shaping or treating: apparatus – Press forming apparatus having opposed press members
Patent
1990-02-28
1991-06-18
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Press forming apparatus having opposed press members
249135, 264 5, 425408, B30B 1102
Patent
active
050245597
ABSTRACT:
An apparatus for forming a pellet is disclosed that includes at least one punch that is reciprocably movable through an opening in a die for compressing a granular material, such as uranium dioxide, into a pellet such as the fuel pellets used in the fuel assemblies that generate power in nuclear reactors. The punch is advantageously formed from an alloy consisting essentially of tungsten carbide having a grain size of less than one micron which is embedded in a matrix of cobalt which constitutes between 16.5 and 17.5% by weight of the alloy. The alloy is preferably hot isostatically pressed to achieve zero porosity and a density of approximately 14.0 gm/cc.sup.3. Additionally, essentially pure ingredients are preferably used to avoid interfaces in the resulting alloy which could provide situs for chipping. The resulting alloy has a Rockwell scale A hardness of 89.0, and results in a punch which, even when chamfered around its edges, is capable of producing a large number of uranium dioxide fuel pellets without chipping.
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Mitsubishi Carbide Cat. No. 5110, p. 5.
Matney, Jr. William J.
Westinghouse Electric Corp.
Woo Jay H.
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