Abrasive tool having film-covered CBN grits bonded by brazing to a substrate

• US 5,389,118 A
• Filed: 11/17/1993
• Issued: 02/14/1995
• Est. Priority Date: 11/20/1992
• Status: Expired due to Fees

• Current Assignee: CSEM Centre Suisse D'Electronique et de Microtechnique SA
• Original Assignee: CSEM Centre Suisse d'Electronique et de Microtechnique SA Recherche et Développement
• Inventors: Chattopadhyay, Ajay K., Hinterman, Hans E.
• Primary Examiner(s): Bell, Mark L.
• Assistant Examiner(s): JONES, DEBORAH D
• Application Number:
  US08/153,626
• Time in Patent Office: 454 Days
• Field of Search: 51/293, 51/295, 51/308, 51/309, 51/307, 427/212, 427/215, 427/217
• US Class Current: 51/295
• CPC Class Codes: B24D 3/06 metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
• CPC Class Codes: C23C 16/325 Silicon carbide
• CPC Class Codes: C23C 16/4417 Methods specially adapted for coating powder

Abstract

The invention concerns in one aspect a CBN abrasive tool comprising a metal, ceramic or cemented carbide substrate and a single layer of CBN grits bonded to said substrate by a brazing alloy, characterized in that the surface chemistry of said CBN grits is modified by depositing thereon a film of silicon carbide. The invention also concerns, in another aspect, a method of manufacturing a CBN abrasive tool comprising the steps of providing a metal, ceramic or cemented carbide substrate; providing a plurality of CBN grits; depositing a film of silicon carbide on said CBN grits; and, bonding the carbide film-coated CBN grits to said substrate by a brazing alloy.

Claims

1. A CBN abrasive tool comprising a metal, ceramic or cemented carbide substrate and a single layer of CBN grits bonded to said substrate by a brazing alloy, wherein the surface chemistry of said CBN grits is modified by depositing thereon a film of silicon carbide.

2. A CBN abrasive tool according to claim 1, wherein said film is deposited on said CBN grits by chemical vapor deposition.

3. A CBN abrasive tool according to either of claims 1 or 2, wherein said film is deposited on said CBN grits at a temperature of 1200°

C. or less.

4. A CBN abrasive tool according to claims 1 or 2 wherein said brazing alloy is a Ni or Co based alloy containing at least one of the transition elements Ti, Zr, Hf, V, Nb, Ta, Cr, Mo or W.

5. A CBN abrasive tool according to claim 3, wherein said brazing alloy is a Ni or Co based alloy containing at least one of the transition elements Ti, Zr, Hf, V, Nb, Ta, Cr, Mo or W.