Molding tool and method

Details Molding tool and method Molding tool and method

1984-04-06

1986-05-20

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

6537411, 6537413, 249134, 264219, 427 34, B29C 3300, B29C 4142

Patent

active

045900310

ABSTRACT:
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 have a high gloss and can also be used as a decorative coating.
The coating can be made by sputtering boron and carbon onto a substrate. A bias voltage may be applied to the substrate during sputtering.
In accordance with one embodiment, the disordered boron and carbon coating is of a composition B.sub.x C.sub.1-x where x is from about 0.60 to about 0.90.
In accordance with another embodiment, an improved molding tool is provided that includes a disordered carbon coating on at least a portion of the working surface of the molding tool. The coating provides improved release characteristics, longer tool life and results in molded articles having smoother finishes and improved detail.

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