US4288248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature resistant abrasive compact and method for making same
Assignee: General Electric Co
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Filing: 1978-11-13
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Granted: 1981-09-08
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Expires: 1998-11-13
Abstract
Abstract In one embodiment, a compact for tools, such as cutting, drilling and shaping tools, consists essentially of self-bonded abrasive particles. The bonded particles define a substantially continuous interconnected network of pores, dispersed throughout the compact. The method for making such a compact comprises the steps of bonding a mass of abrasive particles, aided by a sintering aid material, under high temperatures and pressures (HP/HT) to form an abrasive body comprised of said particles in a self-bonded form and said material infiltrated throughout the body. The body is then treated to remove substantially all infiltrated material, thereby to produce a compact consisting essentially of the self-bonded abrasive particles. In another embodiment, a composite compact which is made in a similar manner to the first embodiment consists essentially of a layer of self-bonded abrasive particle and a substrate layer (preferably of cemented carbide) bonded to the abrasive particle layer.
Inventors
- 👤 Harold P. Bovenkerk
- 👤 Paul D. Gigl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:40
CPC Classifications
B; B24; B24D; B24D18/00; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B24D3/00; B24D3/008; B24D3/02; B24D3/04; B24D3/06; B24D3/10; C; C22; C22C; C22C26/00; C23; C23F; C23F1/00; C23F1/02; C23F1/10; C23F1/14; C23F1/16; C23F1/28; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/0645; B01J2203/065; B01J2203/0655; B01J2203/066; B01J2203/0675; B01J2203/0685
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
A method of making a tool component comprising: a. placing within a reaction cell a mass of abrasive particles selected from the group consisting of diamond and cubic boron nitride and a mass of sintering aid material for said abrasive particle mass; b. simultaneously subjecting said cell and the contents to temperatures in the range of 1200° C. and to 2000° C. and pressures in excess of 40 kilobars; c. ceasing the input of heat to said cell; d. removing from said cell an abrasive body formed by steps (a) to (c), said body comprising said particles in a self-bonded form and said material infiltrated throughout the particles the improvement comprising: removing substantially all said material infiltrated in said body by contacting said body with a first hot medium comprising nitric acid and hydrofluoric acid and then a second hot medium comprising hydrochloric acid and nitric acid.
Claim 2
Independent Claim
147 words
A method of making a tool component comprising: a. placing within a reaction cell a mass of abrasive particles selected from the group consisting of diamond and cubic boron nitride and a mass of sintering aid material for said abrasive particle mass; b. simultaneously subjecting said cell and the contents to temperatures in the range of 1200° C. and to 2000° C. and pressures in excess of 40 kilobars; c. ceasing the input of heat to said cell; d. removing from said cell an abrasive body formed by steps (a) to (c), said body comprising said particles in a self-bonded form and said material infiltrated throughout the particles the improvement comprising: removing substantially all said material infiltrated in said body by contacting said body with a first hot medium comprising nitric acid and hydrofluoric acid and then a second hot medium comprising hydrochloric acid and nitric acid.
Claim 3
Dependent Claim
75 words
The process of claim 1 wherein said particles are diamond and said material is selected from the group consisting of (1) a catalytic metal in elemental form, selected from the group consisting of group VIII metals Cr, Mn, Ta; (2) a mixture of alloyable metals of the catalytic metal(s) and non-catalytic metal(s); (3) an alloy of at least two of said catalytic metals; and (4) an alloy of the catalytic metal, (5) and non-catalytic metal(s).
Claim 4
Dependent Claim
45 words
The process of claim 1 wherein said particles are boron nitride and said material is selected from the group consisting of Co; alloys of Co; and alloys of Al and an alloying metal selected from the group consisting of Ni, Mn, Fe, V and Cr.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein said first medium is 1 HF:1 HNO 3 .
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein said second medium is 3 HCl:1 HNO 3 .
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein said second medium is 3 HCL:1 HNO 3 .
References Cited (Backward Citations)
US3663191A
Cited
US3745623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |