US3874856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous composite of abrasive particles in a pyrolytic carbon matrix and the method of making it
Assignee: Goodrich Corp
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Filing: 1973-02-26
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Granted: 1975-04-01
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Expires: 1993-02-26
Abstract
Abstract A composite product and method of producing same, having abrasive or refractory particles held together by a binder in which the composite product is treated to form the binder into a porous skeletal network and subsequently expose to the presence of a carbonaceous gas at temperatures from approximately 1,900* to approximately 2,300*F., which at least partly replaces it with a pyrolytic carbon matrix, the product having porosity controlled by the amount of pyrolytic deposition.
Inventors
- 👤 Donald H Leeds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; B; B24; B24D; B24D18/00; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B24D3/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
104 words
THE METHOD OF MAKING A POROUS COMPOSITE PRODUCT COMPRISING THE STEPS OF: A. FORMING A GREEN PRODUCT COMPRISING SPACED ABRASIVE PARTICLES AND A METAL GRAPHITIZATION CATALYST HELD TOGETHER BY A BINDER; B. PYROLYZING SAID BINDER SO AS TO FORM A SKELETAL NET WORK C. MAINTAINING SAID SKELETAL NETWORK IN THE PRESENCE OF A CARBONACEOUS GAS, AT A TEMPERATURE OF BETWEEN APROXIMATELY 1,900*F, AND APPROXIMATELY 2,300*F. TO FORM A PYRLYTIC CARBON MATRIX TO HOLD SAID PARTICLES IN PLACE IN THE POROUS COMPOSITE PRODUCT; AND D. HEAT TREATING THE PRODUCT THUS FORMED OVER THE TEMPERATURE RANGE FROM 2,375*F. TO 3,100*F. TO GRAPHITIZE SAID PYROLYTIC CARBON MATRIX.
Claim 2
Independent Claim
104 words
THE METHOD OF MAKING A POROUS COMPOSITE PRODUCT COMPRISING THE STEPS OF: A. FORMING A GREEN PRODUCT COMPRISING SPACED ABRASIVE PARTICLES AND A METAL GRAPHITIZATION CATALYST HELD TOGETHER BY A BINDER; B. PYROLYZING SAID BINDER SO AS TO FORM A SKELETAL NET WORK C. MAINTAINING SAID SKELETAL NETWORK IN THE PRESENCE OF A CARBONACEOUS GAS, AT A TEMPERATURE OF BETWEEN APROXIMATELY 1,900*F, AND APPROXIMATELY 2,300*F. TO FORM A PYRLYTIC CARBON MATRIX TO HOLD SAID PARTICLES IN PLACE IN THE POROUS COMPOSITE PRODUCT; AND D. HEAT TREATING THE PRODUCT THUS FORMED OVER THE TEMPERATURE RANGE FROM 2,375*F. TO 3,100*F. TO GRAPHITIZE SAID PYROLYTIC CARBON MATRIX.
Claim 3
Dependent Claim
63 words
A method as defined in claim 1 in which said graphitization catalyst comprises ferro silicon containing 15 to 35 weight percent silicon in a particle size of 25 to 125 microns and in which said product is heat treated for from 2 to 20 hours to cause the pyrolytic carbon to graphitize and decrease electrical resistivity and increase thermal conductivity of the product.
Claim 4
Dependent Claim
48 words
A method as defined in claim 1 in which said abrasive particles are composed of alumina and silicon carbide particles in mesh sizes from approximately 2 mesh to approximately 600 mesh and comprising a weight percent from 48 to 85% of the constituents in the final composite product.
Claim 5
Dependent Claim
40 words
A method as defined in claim 1 in which said abrasive particles are selected from a group consisting of alumina, silicon carbide, diamond, garnet, silica, spinel, zircon, ruby alumina, boron alumina, fused alumina, cubic boron nitride, alumina-zirconia and aluminachromia compositions.
Claim 6
Dependent Claim
42 words
A method as defined in claim 1 in which said binder is an organic binder selected from a group consisting of urea formaldehyde, epoxy and phenolic resins, furfural alcohol, monosaccharides, disaccharides, starches, dextrin, ligneous liquors, ethyl silicates and albumen, and polysaccharides gums.
Claim 7
Dependent Claim
15 words
A method as defined in claim 5 in which said organic binder includes vitreous material.
Claim 8
Dependent Claim
33 words
A porous composite product comprising a multiplicity of spaced abrasive particles and a metal graphitization catalyst held together by a pyrolyzed binder and a coating of graphitized pyrolytic carbon which surrounds each particle.
Claim 9
Dependent Claim
33 words
A porous composite product comprising a multiplicity of spaced abrasive particles and a metal graphitization catalyst held together by a pyrolyzed binder and a coating of graphitized pyrolytic carbon which surrounds each particle.
Claim 10
Dependent Claim
49 words
A porous composite product as defined in claim 7 in which said abrasive particles are composed of alumina and silicon carbide particles comprising a composition from 48 to 85 weight percent and in which said graphitization catalyst is ferro silicon comprising a composition of up to 30 weight percent.
Claim 11
Dependent Claim
15 words
A porous composite product as defined in claim 7 in which said binder is inorganic.
Claim 12
Dependent Claim
17 words
A porous composite product as defined in claim 7 where said spaced abrasive particles are refractory particles.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |