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COMPOSITE COMPACT COMPONENTS FABRICATED WITH HIGH TEMPERATURE BRAZING FILLER METAL AND METHOD FOR MAKING SAME

IP.com Disclosure Number: IPCOM000010036D
Publication Date: 2002-Oct-10
Document File: 1 page(s) / 22K

Publishing Venue

The IP.com Prior Art Database

Abstract

An improved fabrication technique to bond cemented carbide supported abrasive compacts (including polycrystalline diamond and/or cubic boron nitride) to cemented carbide with a filler metal which has a liquidus temperature substantially higher than the degradation temperature of the abrasive in the compact

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COMPOSITE COMPACT COMPONENTS FABRICATED WITH HIGH TEMPERATURE BRAZING FILLER METAL AND METHOD FOR MAKING SAME

Conventional methods for bonding cemented carbide supported abrasive (including polycrystalline diamond and/or cubic boron nitride) compacts to a cemented carbide substrate for machine tool fabrication purposes include brazing filler metals with liquidus temperatures less than 700 C. These alloys with a melting point below the degradation temperature of the compact abrasive suffer from having low strength and often fail at the braze joint in high strength applications.

We have found an improved fabrication technique to bond cemented carbide supported abrasive compacts (including polycrystalline diamond and/or cubic boron nitride) to cemented carbide with a filler metal which has a liquidus temperature substantially higher than the degradation temperature of the abrasive in the compact

As described in US4319707, a heat sink provided with coolant flow maintains the temperature of the compact abrasive below its degradation temperature while the braze metal is melted using localized heating by means of an induction coil connected to a radio frequency generator.� � The improved technique employs a braze metal having a composition selected from the followings:

A)  Pd: 20-80%, Cr: 2-13%, B: 1-4%, Ni: balance (as described in US4772294),

B)   B) Au: 18-39.5%, Ni: 3.5-14.5%, Pd: 2.5-10.5%, Mn: 7.5-9.0%, Cu: balance (as described in US4527998).