US4024675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing aggregated abrasive grains
Assignee: Individual
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Filing: 1975-12-08
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Granted: 1977-05-24
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Expires: 1995-12-08
Abstract
Abstract A method of producing aggregated abrasive grains for cutting tools and the like, comprising sintering a mixture of abrasive material powders and metal or alloy powders together with 5 to 10% by weight of the metal powders of an adhesion-active agent, to obtain a cake which is subsequently crushed. The sintering takes place in a loose state so that the cake has a porous structure which by crushing forms aggregated abrasive grains which break along the voids.
Inventors
- 👤 Jury Vladimirovich Naidich
- 👤 Irina Alexandrovna Lavrinenko
- 👤 Vladimir Afanasievich Kondratsky
- 👤 Jury Nikolaevich Semenov
- 👤 Boris Mikhailovich Emelyanov
- 👤 Leonid Pinkhusovich Kogosov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:01
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1418
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
In a method of producing aggregated abrasive grains in which a mixture of abrasive powders and metal powders is sintered to produce a cake which is crushed to form the abrasive grains, the improvement comprising the steps of: adding an adhesion-active agent to the mixture, the agent being selected from the group consisting of titanium, zirconium, chromium, vanadium and silicon; maintaining the mixture in a loose bulk state during the sintering step; and effecting the sintering at a temperature of between 800 and 1200° C., sufficient to melt the metal powders, so that the produced cake is porous; wherein the abrasive powders are selected from the group consisting of diamond, cubic boron-nitride, boron-carbide, silicon-carbide and aluminum-oxide powders; the metal powders being selected from the group consisting of copper, tin, nickel, cobalt, iron, silver, and alloys thereof; the ratio of the abrasive powders to the metal powders being between 4:1 and 1:1.5 by weight; and the adhesion-active agent being added to and present in an amount between 5 and 10% by weight of the metal powders.
Claim 2
Dependent Claim
175 words
In a method of producing aggregated abrasive grains in which a mixture of abrasive powders and metal powders is sintered to produce a cake which is crushed to form the abrasive grains, the improvement comprising the steps of: adding an adhesion-active agent to the mixture, the agent being selected from the group consisting of titanium, zirconium, chromium, vanadium and silicon; maintaining the mixture in a loose bulk state during the sintering step; and effecting the sintering at a temperature of between 800 and 1200° C., sufficient to melt the metal powders, so that the produced cake is porous; wherein the abrasive powders are selected from the group consisting of diamond, cubic boron-nitride, boron-carbide, silicon-carbide and aluminum-oxide powders; the metal powders being selected from the group consisting of copper, tin, nickel, cobalt, iron, silver, and alloys thereof; the ratio of the abrasive powders to the metal powders being between 4:1 and 1:1.5 by weight; and the adhesion-active agent being added to and present in an amount between 5 and 10% by weight of the metal powders.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |