Abrasive particles with metallurgically bonded metal coatings
First Claim
1. A composite abrasive particle comprising:
- an abrasive core particle;
a metallic deposit metallurgically bonded to said abrasive core particle, said metallic deposit being selected from the group consisting of rhenium, ruthenium, osmium, and mixtures and alloys thereof.
1 Assignment
0 Petitions
Accused Products
Abstract
An abrasive composite particle comprising a cubic abrasive core particle encapsulated within a deposit of hexagonal metallurgical bond forming material comprising at least about 50 volume percent rhenium, ruthenium, osmium or mixtures thereof. The metallurgical bonds serve to retain the core particle in a matrix/binder very strongly. Metallurgical bonds are formed by the encapsulating material taking into solution, at the interface with the cubic abrasive core particle, some element or compound from the abrasive particle such as, for example, carbon or cubic boron nitride, from the core particle. Chemical bonds are not formed between the abrasive particle and the deposit. Suitable abrasive core particles include diamond, cubic carbides, cubic borides, cubic nitrides, cubic oxides, and the like. Conventional fabrication procedures such as chemical vapor deposition are employed to form the metallurgical bond forming deposit on the core particle. The composite abrasive particles are useful in forming articles according to conventional powdered metal processing operations. The articles so formed are useful for their hardness as well as their abrasiveness.
37 Citations
34 Claims
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1. A composite abrasive particle comprising:
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an abrasive core particle;
a metallic deposit metallurgically bonded to said abrasive core particle, said metallic deposit being selected from the group consisting of rhenium, ruthenium, osmium, and mixtures and alloys thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A composite abrasive particle comprising:
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an abrasive core particle;
a first metallic deposit metallurgically bonded to said abrasive core particle, said first metallic deposit comprising at least 50 volume percent of hexagonal refractory metal selected from the group consisting of rhenium, ruthenium, osmium, and mixtures thereof. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A method of forming a composite abrasive particle that comprises a core abrasive particle and a metallic deposit metallurgically bonded to said core abrasive particle, said method comprising:
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selecting a cubic abrasive core particle;
cleaning a surface of said abrasive core particle;
forming a metallic deposit on said clean surface to form a two-phase composite particle, said metallic deposit being selected from the group consisting of rhenium, ruthenium, osmium, and mixtures and alloys thereof;
heating said two-phase composite particle at a temperature sufficient to promote the formation of a metallurgical bond between the phases of said two-phase composite particle;
cooling said two-phase composite particle at a rate sufficient to maintain said metallurgical bond. - View Dependent Claims (23, 24)
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25. A multi-grain shaped article comprising a plurality of composite abrasive particles embedded in a matrix/binder, wherein the said composite abrasive particles comprise:
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an abrasive core particle;
a first metallic deposit metallurgically bonded to said abrasive core particle, said first metallic deposit comprising at least 50 volume percent of metal selected from the group consisting of rhenium, ruthenium, osmium, and mixtures thereof. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. A process of forming a shaped article comprising a plurality of composite abrasive particles, said process comprising:
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selecting an abrasive core particle having a clean surface;
forming a metallic deposit on said clean surface to form a two-phase composite particle, said metallic deposit being selected from the group consisting of rhenium, ruthenium, osmium, and mixtures and alloys thereof;
heating said two-phase composite particle at a temperature sufficient to promote the formation of a metallurgical bond between the phases of said two-phase composite particle;
cooling said two-phase composite particle at a rate sufficient to maintain said metallurgical bond; and
forming a plurality of said two-phase composite particles into a shaped article. - View Dependent Claims (33, 34)
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Specification