GB860499A - Methods of making cubic boron nitride - Google Patents

Methods of making cubic boron nitride

Info

Publication number
GB860499A
GB860499A GB273958A GB273958A GB860499A GB 860499 A GB860499 A GB 860499A GB 273958 A GB273958 A GB 273958A GB 273958 A GB273958 A GB 273958A GB 860499 A GB860499 A GB 860499A
Authority
GB
United Kingdom
Prior art keywords
nitride
magnesium
boron nitride
cubic boron
tin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB273958A
Inventor
Robert Henry Wentorf Jr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to GB273958A priority Critical patent/GB860499A/en
Publication of GB860499A publication Critical patent/GB860499A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/583—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on boron nitride
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/583—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on boron nitride
    • C04B35/5831—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on boron nitride based on cubic boron nitrides or Wurtzitic boron nitrides, including crystal structure transformation of powder

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Ceramic Products (AREA)

Abstract

<PICT:0860499/III/1> <PICT:0860499/III/2> Cubic boron nitride is produced by subjecting hexagonal boron nitride to an elevated temperature and pressure in the presence of a catalyst comprising an alkali metal, alkaline earth metal, lead, antimony, tin or a nitride of one of the foregoing metals. Three parts of hexagonal boron nitride are mixed with one part (by volume) of the catalyst and the mixture is pressed and heated in a carbon or tantalum tube 33 between dies 22 of an hydraulic press, with electric current flowing through conductive parts 22, 38, 32 and the tube 33. With magnesium as the catalyst the conversion is effected with temperatures of 1300 DEG to 2100 DEG C. and pressures of 69,000 to 95,000 atmospheres applied for three minutes. The conversion is also described as being effected with sodium, potassium, lithium, barium, calcium, lead, antimony, tin, magnesium nitride, lithium nitride, magnesium nitride and tin, magnesium nitride and magnesium and with magnesium nitride and sodium at similar pressures and temperatures, higher pressures being necessary for higher temperatures. Larger crystals of cubic boron nitride, including octahedral fragments 300 microns on edge, are obtained from the mixture comprising boron nitride, magnesium nitride and sodium than from other mixtures. In a further example a magnesium wire in boron nitride is used. The cubic boron nitride is very hard and may be used to tip cutting tools, Fig. 5, to which it is secured with silver/copper solder and titanium hydride, or to form the abrasive portion of p grinding-wheels or even to grind diamonds. Specifications 829,990 and 830,210 are referred to.
GB273958A 1958-01-27 1958-01-27 Methods of making cubic boron nitride Expired GB860499A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB273958A GB860499A (en) 1958-01-27 1958-01-27 Methods of making cubic boron nitride

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB273958A GB860499A (en) 1958-01-27 1958-01-27 Methods of making cubic boron nitride

Publications (1)

Publication Number Publication Date
GB860499A true GB860499A (en) 1961-02-08

Family

ID=9744963

Family Applications (1)

Application Number Title Priority Date Filing Date
GB273958A Expired GB860499A (en) 1958-01-27 1958-01-27 Methods of making cubic boron nitride

Country Status (1)

Country Link
GB (1) GB860499A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1169902B (en) * 1961-05-19 1964-05-14 Gen Electric Process for the production of electrically conductive cubic boron nitride
DE1170381B (en) * 1961-07-10 1964-05-21 Gen Electric Process for the production of electrically conductive cubic boron nitride
US3192015A (en) * 1963-04-01 1965-06-29 Gen Electric Growth of large cubic form of boron nitride crystals
US3212852A (en) * 1962-07-30 1965-10-19 Gen Electric Method for converting hexagonal boron nitride to a new structure
US3212851A (en) * 1962-05-02 1965-10-19 Gen Electric Boron nitride having a new structure
DE2531339A1 (en) * 1974-07-29 1976-02-12 De Beers Ind Diamond METHOD OF MANUFACTURING CUBIC BORNITRIDS
FR2597087A1 (en) * 1986-04-15 1987-10-16 Centre Nat Rech Scient USE AS A FLOW IN THE PREPARATION OF CUBIC BORON NITRIDE OF A FLUORONITRIDE AND PROCESS FOR THE PREPARATION OF CUBIC BORON NITRIDE USING SUCH A FLOW

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1169902B (en) * 1961-05-19 1964-05-14 Gen Electric Process for the production of electrically conductive cubic boron nitride
DE1170381B (en) * 1961-07-10 1964-05-21 Gen Electric Process for the production of electrically conductive cubic boron nitride
US3212851A (en) * 1962-05-02 1965-10-19 Gen Electric Boron nitride having a new structure
US3212852A (en) * 1962-07-30 1965-10-19 Gen Electric Method for converting hexagonal boron nitride to a new structure
US3192015A (en) * 1963-04-01 1965-06-29 Gen Electric Growth of large cubic form of boron nitride crystals
DE2531339A1 (en) * 1974-07-29 1976-02-12 De Beers Ind Diamond METHOD OF MANUFACTURING CUBIC BORNITRIDS
FR2597087A1 (en) * 1986-04-15 1987-10-16 Centre Nat Rech Scient USE AS A FLOW IN THE PREPARATION OF CUBIC BORON NITRIDE OF A FLUORONITRIDE AND PROCESS FOR THE PREPARATION OF CUBIC BORON NITRIDE USING SUCH A FLOW
US4810479A (en) * 1986-04-15 1989-03-07 Centre National De La Recherche Scientifique (Cnrs) Preparation of cubic boron nitride using as a flux a fluoronitride

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