Improved moulding tool and method

Outil pour mouler et procédé

Formwerkzeug und Verfahren


A coating and method of depositing it is provided. The wear resistant coating comprises a thin layer of disordered boron and carbon applied to a substrate. The coating has good adherence and provides good resistance to wear so that it is useful as a tool coating. In a more specific embodiment, the coating is disordered boron carbide. The coating can be made by sputtering boron and carbon onto a substrate. A bias voltage may be applied to the substrate during sputtering. The disordered boron and carbon coating can have a composition B x C 1-x where x is from about 0.60 to about 0.90. An improved molding tool (10) is provided that includes a disordered carbon coating on at least a portion of the working surface of the molding tool (10). The coating provides im- . proved release characteristics, longer tool life and results in molded articles having smoother finishes and improved detail.




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Patent Citations (4)

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    DE-3234931-A1April 14, 1983Energy Conversion Devices IncUeberzugsmasse und beschichtungsverfahren
    EP-0136161-A1April 03, 1985Ovonic Synthetic Materials Company, Inc.Disordered coating and method
    GB-1435045-AMay 12, 1976Hughes Tool CoWear resistant boronized surfaces and boronizing methods
    JP-S5415481-AFebruary 05, 1979Seiko Epson CorpExterior parts for portable watch

NO-Patent Citations (1)

    PATENTS ABSTRACTS OF JAPAN, unexamined applications, C field, vol. 3, no. 43, April 13, 1979 THE PATENT OFFICE JAPANESE GOVERNMENT page 55 c 42 & JP-A-54-15 481 (suwa seikosha k.k.)

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