Title: Process for the preparation of a composite cubic boron nitride layer abrasive body

Abstract: Cubic boron nitride (CBN) crystals of graded particle size are chemically cleaned and disposed in a protective metal cup together with a mass of substrate source material and a concentration of metal for providing an alloy for infusing and wetting the walls of capillary-size voids. The CBN content is increased in density to greater than 70% by volume and placed within a semi-isostatic system of finely-divided powder. Pressure in the range of from about 20,000 to about 100,000 psi is applied semi-isostatically to the system and thereby to the metal cup and its contents. Heat and pressure are then simultaneously applied to the semi-isostatic system. Liquefied infusing and wetting alloy enters the interstices between the CBN crystals to bond them together. The entire system is cooled and the strong composite body of metal-bonded CBN directly bonded to a substrate is recovered therefrom.

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Inventors: Lee, Minyoung (Schenectady, NY, US)

Application Number: 515867
Filing Date: 1974-10-18
Publication_date: 1976-09-28
Assignee: General Electric Company (Schenectady, NY)
Primary Class(es): 51/307 51/308, 51/309
Other Classes:
US Patent Ref:

3407445	Oct, 1968	Strong	51/307.
3469976	Sep, 1969	Iler	264/65.
3743489	Jul, 1973	Wentorf et al.	51/307.
3767371	Oct, 1973	Wentorf et al.	51/307.
3850591	Nov, 1974	Wentorf et al.	51/307.

Other Refs:
Primary Examiner: Arnold, Donald J.
Assistant Examiner:
Attorney: Binkowski; Jane M., Cohen; Joseph T., Squillaro; Jerome C.