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US 5,626,909 AGranted
Fabrication of brazable in air tool inserts
AssigneeGeneral Electric Company
InventorCharles D. Iacovangelo
Life of this patent
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Abstract
Tool inserts are produced that can be brazed in air at temperatures as low as 700.degree. C. The tool compact, such as a polycrystalline diamond compact or a cubic boron nitride compact, has a multilayer coating comprising a metal bonding layer and a protective layer. Once coated with the bonding layer and the protective layer, the tool insert can be air brazed to a tool support in a manufacturing environment using a standard braze without a vacuum furnace or special atmosphere. A method for manufacturing the tool insert is also disclosed.
Claims12
A method for manufacturing a tool insert comprising the steps of:
- a. depositing a metal bonding layer on a tool compact of cubic boron nitride,
- b. depositing a protective layer on the metal bonding layer to form a multilayer coated tool insert,
- c. heating the metal bonding layer at a temperature and for a time sufficient to form a metal carbide or nitride at the interface between the metal bonding layer and the tool compact to provide adhesion of the metal bonding layer to the tool compact,
- d. heating the protective layer to provide adhesion of the protective layer to the metal bonding layer, either simultaneously or sequentially with Step c.
1 more element
Dependencies are inferred from the claim text.