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US5538528A Glass optical element press-molding die having a tantalum containing alloy surface layer 失效
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Glass optical element press-molding die having a tantalum containing
alloy surface layer
摘要:
A die for press-molding a glass optical element which includes a base material having a surface to press-mold glass and a tantalum(Ta)-containing alloy thin layer on the surface, the base material being heat-resistant and strong enough to withstand press-molding.
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