Patent US4751099A successfully refreshed from Google Patents.
Patent EP0071036A2 successfully refreshed from Google Patents.
EP0071036A2
Expired / Lapsed
EP
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Process for making diamond and cubic boron nitride compacts
Assignee: General Electric Co
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Filing: 1982-07-02
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Granted: —
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Expires: 2002-07-02
Abstract
Abstract The improved process for making diamond and cubic boron nitride compacts comprises embedding within the mass of abrasive crystals (18) at least one partition strip (20) subdividing the abrasive crystal mass (18), which partition strip (20) is characterized by maintaining segregation between the separate portions of the abrasive crystal mass during step A and being sufficiently pliable no to resist the compaction of the abrasive crystal masses; subjecting a mass of abrasive crystals (18) selected from the group consisting of diamond, cubic boron nitride and mixtures thereof, which mass is in contact with a source of catalyst/ solvent for recrystallization of the abrasive crystals, to conditions of temperature, pressures and time which result in a compact having intercrystal bonding between adjacent crystal grains; recovering the compact produced; and removing substantially all of the metallic phase from the compact of step B.
Inventors
- 👤 Paul Donald Gigl
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 17:03
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/5676; B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/0645; B01J2203/065; B01J2203/0655; B01J2203/066; B01J2203/0675; B01J2203/0685
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
3 words
I claim :
Claim 2
Dependent Claim
148 words
In a process for preparing a compact which comprises A. subjecting a mass of abrasive crystals (18) selected from the group consisting of diamond, cubic boron nitride and mixtures thereof, which mass is in contact with a source of catalyst/ solvent for recrystallization of the abrasive crystals, to conditions of temperature, pressure and time which result in a compact having intercrystal bonding between adjacent crystal grains ; and B. recovering the compact produced ; and C. removing substantially all of the metallic phase from the compact of step B ; the improvement which comprises embedding within the mass of abrasive crystals (18) at least one partition strip (20) subdividing the abrasive crystal mass (18), which partition strip (20) is characterized by maintaining segregation between the separate portions of the abrasive crystal mass during step A and being sufficiently pliable not to resist the compaction of the abrasive masses.
Claim 3
Dependent Claim
16 words
The improved process as recited in claim 1, wherein step C is accomplished by acid treatment.
Claim 4
Dependent Claim
40 words
The improved process as recited in claim 2 wherein the acid treatment comprises contacting the compact from step B first with a hot mixture of nitric and hydrofluoric acids and secondly with a hot mixture of hydrochloric and nitric acids.
Claim 5
Dependent Claim
48 words
The improved process as recited in claim 1 wherein the mass of abrasive crystals and the catalyst/solvent source have been placed within a protective shield metal enclosure (11, 12) which is disposed within the reaction zone (10) of a high pressure/high temperature apparatus for carrying out step A.
Claim 6
Dependent Claim
62 words
In a process for preparing a compact which comprises : A. subjecting a mass of abrasive crystals (18) selected from the group consisting of diamond, cubic boron nitride and mixtures thereof, which mass is in contact with a source of catalyst/ solvent for recrystallization of the abrasive crystals, to conditions of temperature, pressure and time which result in a compact ; and
Claim 7
Dependent Claim
69 words
B. recovering the compact produced ; the improvement which comprises embedding within the mass of abrasive crystals (18) at least two partition strips (20) extending through the shortest dimention of the abrasive crystal mass which partition strips (20) are characterized by maintaining segregation between the separate portions of the abrasive crystal mass during step A and being sufficiently pliable not to resist the compaction of the abrasive crystal mass.
Claim 8
Dependent Claim
43 words
The improved process as recited in claim 5 wherein the mass of abrasive crystals and the catalyst/solvent source have been placed within a protective shield metal enclosure (11, 12) which is disposed within the reaction zone (10) of a high pressure/high temperature apparatus.
Claim 9
Dependent Claim
32 words
The improved process as recited in claim 6 wherein the reaction zone (10) is cylindrical in shape, and the partition strips (20) are oriented parallel to the axis of the reaction zone.
Claim 10
Dependent Claim
43 words
The process as recited in claim 5 which further comprises removing the exposed parts of the partition strips (20) from the compacts recovered in step B in order to produce multiple, free standing polycrystalline abrasive crystal zones on the surface of the compact.
Claim 11
Dependent Claim
25 words
The process as recited in claim 5 which further comprises disposing the mass of abrasive crystals in step A in contact with a metal carbide.
Claim 12
Dependent Claim
24 words
The improved process of claim 9 wherein the metal carbide is selected from the group consisting of tantalum carbide, titanium carbide, and tungsten carbide.
Claim 13
Dependent Claim
16 words
The improved process of claim 9 wherein the partition strips are extended into the metal carbide.
Claim 14
Dependent Claim
48 words
The improved process as recited in claims 1 or 5 wherein the partition strip (20) is not a catalyst/solvent for the abrasive crystals and wherein its melting point, under the conditions of the HP/HT process, is at least slightly higher than that of the catalyst/solvent of step A.
Claim 15
Dependent Claim
42 words
The improved process as recited in claim 12 wherein the partition strips (20) are made of a material selected from the group consisting of a Group III B, IV B, V B, VI B, VII B, and VIII metals and their alloys.
Claim 16
Dependent Claim
35 words
The improved process as recited in claim 12 wherein the partition strips (20) are made of a material selected from the group consisting of molybdenum, nickel-copper alloys, stainless steel, tantalum, titanium, iron, nickel and zirconium.
Claim 17
Dependent Claim
23 words
The improved process of claim 14 wherein the partition strip material is selected from the group consisting of nickel, iron and their alloys.
Claim 18
Dependent Claim
18 words
The improved process as recited in claims 1 or 5 wherein the partition strips (20) describe closed shapes.
Claim 19
Dependent Claim
26 words
The improved process as recited in claim 16 wherein the closed shaped are selected from the group consisting of circles, triangles, rectangles, squares, and star shapes.
Claim 20
Dependent Claim
22 words
The improved process as recited in claim 17 wherein the partition strips (20) comprise a plurality of shapes joined in a bundle.
Claim 21
Dependent Claim
75 words
An improved compact of a polycrystalline mass (18) comprising : (a) polycrystalline abrasive grains selected from the group consisting of diamond, cubic boron nitride, and mixtures thereof ; and (b) a catalyst/solvent, said abrasive crystal grains, in random orientation, being directly bonded to adjacent crystal grains in said mass thereof by intercrystal bonding ; wherein the improvement comprises at least two partition strips (20), embedded within the polycrystalline mass and extending through its shortest dimension.
Claim 22
Dependent Claim
26 words
The improved compact of claim 19 wherein the partition strips (20) are made of a material selected from the group consisting of iron, nickel and cobalt.
Claim 23
Dependent Claim
30 words
The improved compact of claim 20 from which the exposed partition strips (20) have been removed to produce multiple free standing polycrystalline abrasive zones on the face of the compact.
Claim 24
Dependent Claim
29 words
The improved compact as recited in claim 19 which is a composite compact of said polycrystalline mass of crystal grains adjacent and bonded to a cemented metal carbide mass.
Claim 25
Dependent Claim
20 words
The improved composite compact of claim 22 in which the partition strips (20) extend into the cemented metal carbide mass.
Claim 26
Dependent Claim
91 words
In a process for preparing a compact which comprises : A. subjecting a raw material selected from the group consisting of graphite, hexagonal boron nitride, and wurtzite boron nitride to conditions of pressure, temperature and time which result in a compact ; and B. recovering the compact produced ; the improvement which comprises embedding within the raw material at least one partition strip (20) characterized by maintaining segregation between the separated portions of the raw material during step A and being sufficiently pliable no to resist compaction of the raw material.
References Cited (Backward Citations)
No citation records indexed.
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