Stiffly bonded thin abrasive wheel
First Claim
1. An abrasive wheel comprising an abrasive disk consisting essentially of about 2.5-50 vol. % abrasive grains and a complemental amount to total 100 vol. % of a sintered bond of a component consisting essentially of nickel and tin, and a stiffness enhancing metal selected from the group consisting of molybdenum, rhenium, tungsten and a mixture of at least two of said stiffness enhancing metals.
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Accused Products
Abstract
A straight, thin, monolithic abrasive wheel formed of hard and rigid abrasive grains and a sintered metal bond including a stiffness enhancing metal component exhibits superior stiffness. The metals can be selected from among many sinterable metal compositions. Blends of nickel and tin are preferred. The stiffness enhancing metal is a metal capable of providing substantially increased rigidity to the bond without significantly increasing bond hardness. Molybdenum, rhenium, tungsten and blends of these are favored. The sintered bond is generally formed from powders. A diamond abrasive, nickel/tin/molybdenum sintered bond abrasive wheel is preferred. Such a wheel is useful for abrading operations in the electronics industry, such as cutting silicon wafers and alumina-titanium carbide pucks. The stiffness of the novel abrasive wheels is higher than conventional straight monolithic wheels and therefore improved cutting precision and less chipping can be attained without increase of wheel thickness and concomitant increased kerf loss.
46 Citations
46 Claims
- 1. An abrasive wheel comprising an abrasive disk consisting essentially of about 2.5-50 vol. % abrasive grains and a complemental amount to total 100 vol. % of a sintered bond of a component consisting essentially of nickel and tin, and a stiffness enhancing metal selected from the group consisting of molybdenum, rhenium, tungsten and a mixture of at least two of said stiffness enhancing metals.
- 18. A method of cutting a work piece comprising the step of contacting the work piece with at least one abrasive wheel comprising an abrasive disk consisting essentially of about 2.5-50 vol. % abrasive grains and a complemental amount to total 100 vol. % of a sintered bond of a component consisting essentially of nickel and tin, and a stiffness enhancing metal selected from the group consisting of molybdenum, rhenium, tungsten and a mixture of at least two of said-stiffness enhancing metals.
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25. A method of making an abrasive tool comprising the steps of
(a) providing particulate ingredients comprising (1) abrasive grains; - and
(2) a bond composition consisting essentially of nickel powder, tin powder and a stiffness enhancing metal powder selected from the group consisting of molybdenum, rhenium, tungsten and a mixture of at least two of said stiffness enhancing metal powders; (b) mixing the particulate ingredients to form a uniform composition; (c) placing the uniform composition into a mold; (d) compressing the mold to a pressure in the range of about 345-690 MPa for a duration effective to form a molded article; (e) heating the molded article to a temperature in the range of about 1050-1200°
C. for a duration effective to sinter the bond composition; and(f) cooling the molded article to form the abrasive tool. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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- 40. A composition for a sintered bond of a monolithic abrasive wheel consisting essentially of nickel and tin, and a stiffness enhancing metal selected from the group consisting of molybdenum, rhenium, tungsten and a mixture of at least two of them, in which the sintered bond has an elastic modulus of at least about 130 GPa and a Rockwell B hardness less than about 105.
Specification