Tungsten-based sintered material having high strength and high hardness, and hot press mold used for optical glass lenses
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United States of America Patent
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Nov 10, 2009
Grant Date -
Jul 26, 2007
app pub date -
Jul 13, 2004
filing date -
Mar 5, 2004
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Abstract
having the largest particle diameter of 5 μm or less are distributed at boundaries of the W phases; and the largest particle diameter of the W phase is 30 μm or less. The first tungsten-based sintered material is preferably used for a hot press mold for optical glass lenses.
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