Coating processes – Coating by vapor – gas – or smoke – Carbon or carbide coating
Patent
1994-09-22
1996-06-25
Bell, Janyce
Coating processes
Coating by vapor, gas, or smoke
Carbon or carbide coating
4272554, 4272557, 4273722, 427379, 427399, 427404, C23C 1600
Patent
active
055298052
ABSTRACT:
A diamond article, for example, a sheet-form diamond tool insert brazable in air. The diamond sheet has a dual layer coating, a chromium bonding layer and a protective braze compatible overcoat, such as a Ni overcoat. The interface between the Cr layer and the diamond substrate includes sufficient metal carbide component to provide adhesion. Once coated with the Cr layer and the protective overcoat, the dual-coated diamond insert may be air brazed to a tool substrate in a manufacturing environment using a standard braze without a vacuum furnace or special atmosphere. A method for manufacturing the diamond insert comprises the steps of depositing a chromium metal layer on a diamond substrate, depositing a substantially non-oxidizable protective layer on the metal layer and heating the dual-coated diamond article at a temperature for a sufficient time. The diamond insert is coated and heat treated in an oxygen- and nitrogen-free atmosphere to create metal carbide at the diamond-coating interface.
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Iacovangelo Charles D.
Jerabek Elihu C.
Bell Janyce
General Electric Company
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