DUPLEX TREATMENT OF MOLDS FOR DIE-CASTING
This invention pertains to duplex treatment of steel alloy molds, whereby the first step is surface hardening of the mold surface by a suitable nitriding process, followed by a second step of Physical Vapor Deposition (PVD) process yielding a hard coating product with a particular design. The invent...
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Main Author | |
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Format | Patent |
Language | English |
Published |
01.08.2016
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Subjects | |
Online Access | Get full text |
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Summary: | This invention pertains to duplex treatment of steel alloy molds, whereby the first step is surface hardening of the mold surface by a suitable nitriding process, followed by a second step of Physical Vapor Deposition (PVD) process yielding a hard coating product with a particular design. The invention covers 1) the process of preparing or conditioning the as-received mold surface for duplex treatment, 2) the process of plasma nitriding with parameters that yield a nitride surface zone compatible with the subsequent PVD coating process, and 3) the composite product which comprises of a plasma nitride zone underlying the PVD coating with a certain compositional and microstructural architecture. A significant extension of mold life and performance in the manufacture of aluminum die-cast components is obtained by this invention. |
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Bibliography: | Application Number: PH12014000383 |