US3918931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution-precipitation process for manufacturing cubic boron nitride abrasive tools
Assignee: General Electric Co
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Filing: 1973-12-17
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Granted: 1975-11-11
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Expires: 1993-12-17
Abstract
Abstract Hexagonal boron nitride (HBN) is converted to cubic boron nitride (CBN) within a transition metal alloy solvent system containing a small percentage of aluminum. Precipitous drops in the conversion of HBN to CBN occur as the ratio of the weight of HBN to the weight of metal in the initial mixture increases beyond some maximum yield ratio that may be routinely determined for each alloy. An abrasive body is produced in which the binder for the CBN grains is the metal alloy solvent itself, e.g., a superalloy.
Inventors
- 👤 Vries Robert C De
- 👤 James F Fleischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:21
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B24D3/08; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
209 words
THE METHOD OF PREPARING CUBIC BORON NITRIDE ABRASIVE TOOLS COMPRISING THE STEPS OF A. MIXING HBN POWDER WITH A POWDERED METALLIC PHASE TO PRODUCE A HOMOGENEOUS MIXTURE, THE ATOMIC CONTENT OF SAID METALLIC PHASE CONSISTING ESSENTIALLY OF ALUMINUM ATOMS, ATOMS OF A METAL SELECTED FROM THE GROUP CONSISTING OF CHORMIUM AND MANGANESE, AND ATOMS OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT AND NICKEL, THE WEIGHT PER CENT OF HBN IN SAID MIXTURE,BEING IN THE RANGE OF FROM ABOUT 10 TO ABOUT 50 WEIGHT PERCENT, B. PRESSING SAAID MIXTURE INTO SOME PREDETERMINED SHAPE, C. SIMULTANEOUSLY SUBJECTING SAID MIXTURE TO AN OPERATING TEMPERATURE AND OPERATING PRESSURE WITHIN THE STABILITY REGION OF CBN DEFINED BY THE USE OF THE CONSITITUENTS OF PHASE AND THEREBY FORMING AMELT OF THE CONSTITUENTS OF THE METALLIC PHASE, THE PERIOD OF TIME OF SIMULTANEOUS TEMPERATURE AND PRESSURE APPLICATION BEING SUFFICIENT TO PERMIT DISSOLUTION OF ALL OF THE HBN IN THE METALLIC PHASE MELT AND THE PRECIPATION OF CBN CRYSTALS THEREFROM, D. COOLING THE RESULTING CBN/ALLOY SYSTEM TO ABOUT ROOM TEMPERATURE WHILE MAINTAINING THE OPERATING PRESSURE, E. REDUCING THE PRESSURE TO ATMOSPHERIC PRESSURE AND F. RECOVERING THE PRESHAPED ABRASIVE BODY CONSISTING ESSENTIALLY OF CBN CRYSTALS DISTRIBUTED IN A TRANSITION METALALUMINUM ALLOY MATRIX.
Claim 2
Independent Claim
209 words
THE METHOD OF PREPARING CUBIC BORON NITRIDE ABRASIVE TOOLS COMPRISING THE STEPS OF A. MIXING HBN POWDER WITH A POWDERED METALLIC PHASE TO PRODUCE A HOMOGENEOUS MIXTURE, THE ATOMIC CONTENT OF SAID METALLIC PHASE CONSISTING ESSENTIALLY OF ALUMINUM ATOMS, ATOMS OF A METAL SELECTED FROM THE GROUP CONSISTING OF CHORMIUM AND MANGANESE, AND ATOMS OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT AND NICKEL, THE WEIGHT PER CENT OF HBN IN SAID MIXTURE,BEING IN THE RANGE OF FROM ABOUT 10 TO ABOUT 50 WEIGHT PERCENT, B. PRESSING SAAID MIXTURE INTO SOME PREDETERMINED SHAPE, C. SIMULTANEOUSLY SUBJECTING SAID MIXTURE TO AN OPERATING TEMPERATURE AND OPERATING PRESSURE WITHIN THE STABILITY REGION OF CBN DEFINED BY THE USE OF THE CONSITITUENTS OF PHASE AND THEREBY FORMING AMELT OF THE CONSTITUENTS OF THE METALLIC PHASE, THE PERIOD OF TIME OF SIMULTANEOUS TEMPERATURE AND PRESSURE APPLICATION BEING SUFFICIENT TO PERMIT DISSOLUTION OF ALL OF THE HBN IN THE METALLIC PHASE MELT AND THE PRECIPATION OF CBN CRYSTALS THEREFROM, D. COOLING THE RESULTING CBN/ALLOY SYSTEM TO ABOUT ROOM TEMPERATURE WHILE MAINTAINING THE OPERATING PRESSURE, E. REDUCING THE PRESSURE TO ATMOSPHERIC PRESSURE AND F. RECOVERING THE PRESHAPED ABRASIVE BODY CONSISTING ESSENTIALLY OF CBN CRYSTALS DISTRIBUTED IN A TRANSITION METALALUMINUM ALLOY MATRIX.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the metallic phase consists of iron, nickel, chromium and aluminum.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein the mixture contains from about 10 to about 22 weight percent HBN.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the metallic phase consists of nickel, chromium and aluminum.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein the metallic phase consists of iron, manganese and aluminum.
Claim 7
Dependent Claim
18 words
The method of claim 5 wherein the mixture contains from about 15 to about 36 weight percent HBN.
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein the metallic phase consists of nickel, manganese and aluminum.
Claim 9
Dependent Claim
18 words
The method of claim 7 wherein the mixture contains from about 16 to about 42 weight percent HBN.
Claim 10
Dependent Claim
32 words
The method of claim 1 wherein the metallic phase consists of iron-nickel-chromium -aluminum alloy containing 46 weight percent iron, 32 weight percent nickel, 21 weight percent chromium and 1.0 weight percent aluminum.
Claim 11
Dependent Claim
14 words
The method of claim 9 wherein the mixture contains about 42 weight percent HBN.
Claim 12
Dependent Claim
11 words
The method of claim 1 wherein the predetermined shape is annular.
Claim 13
Dependent Claim
10 words
The preshaped abrasive body prepared by the process of claim
Claim 14
Dependent Claim
11 words
The preshaped abrasive body produced by the process of claim 10.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |