GB984194A - Improvements in or relating to the production of diamonds - Google Patents

Improvements in or relating to the production of diamonds

Info

Publication number
GB984194A
GB984194A GB19178/61A GB1917861A GB984194A GB 984194 A GB984194 A GB 984194A GB 19178/61 A GB19178/61 A GB 19178/61A GB 1917861 A GB1917861 A GB 1917861A GB 984194 A GB984194 A GB 984194A
Authority
GB
United Kingdom
Prior art keywords
aluminium
diamonds
graphite
boron
tube
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
GB19178/61A
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
Publication of GB984194A publication Critical patent/GB984194A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
    • B01J3/062—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies characterised by the composition of the materials to be processed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2203/00—Processes utilising sub- or super atmospheric pressure
    • B01J2203/06—High pressure synthesis
    • B01J2203/0605—Composition of the material to be processed
    • B01J2203/061—Graphite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2203/00—Processes utilising sub- or super atmospheric pressure
    • B01J2203/06—High pressure synthesis
    • B01J2203/0605—Composition of the material to be processed
    • B01J2203/0625—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2203/00—Processes utilising sub- or super atmospheric pressure
    • B01J2203/06—High pressure synthesis
    • B01J2203/065—Composition of the material produced
    • B01J2203/0655—Diamond
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2203/00—Processes utilising sub- or super atmospheric pressure
    • B01J2203/06—High pressure synthesis
    • B01J2203/0675—Structural or physico-chemical features of the materials processed
    • B01J2203/068—Crystal growth

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

<PICT:0984194/C1/1> Synthetic diamonds containing boron and/or aluminium are produced by reacting under conditions of high pressure and temperature, e.g. above 50,000 atmospheres and above 1200 DEG C., a non-diamond carbonaceous material; a metal catalyst consisting of one or more of the metals of Group VIII of the Periodic Table, chromium, manganese, or tantalum; and boron and/or aluminium, or a material which decomposes or reacts under the reaction conditions to provide at least one of these elements. The boron is preferably present in the reaction mixture in an amount not exceeding 20% by weight of the graphite and the aluminium in an amount not exceeding 25% by weight of the graphite. The diamonds produced are electrically conductive and may be coloured. Their resistivity at room temperature is from 104 to 107 ohm cm. for diamonds containing boron and 105 to 2.107 ohm cm. for diamonds containing aluminium. The colour for diamonds containing boron varies from light blue to deep purple and the aluminium containing diamonds are white. The apparatus and technique used may be that disclosed in Specifications 830,743 and 830,210, or the pressure vessel in these may be replaced by the vessel illustrated in the Figure which comprises a pyrophyllite cylinder 51 of about 5/32 of an inch wall thickness and 3/4 of an inch outside diameter. Concentrically within this is the graphite heating tube 52, and a further cylinder 53 of alumina. The graphite charge, containing also boron and aluminium, is placed in metal catalyst tube 55 which is then positioned centrally within cylinder 53. Plugs of alumina 56 and 561 (not shown) fit in the ends of the tube 52 to enclose the graphite charge and the catalyst. Suitable end discs 57 are provided to convey the current to tube 52. This type of reaction vessel provides an indirect heating of the sample via the graphite tube.
GB19178/61A 1960-06-16 1961-05-26 Improvements in or relating to the production of diamonds Expired GB984194A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3659560A 1960-06-16 1960-06-16

Publications (1)

Publication Number Publication Date
GB984194A true GB984194A (en) 1965-02-24

Family

ID=21889486

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19178/61A Expired GB984194A (en) 1960-06-16 1961-05-26 Improvements in or relating to the production of diamonds

Country Status (9)

Country Link
JP (1) JPS389552B1 (en)
BE (1) BE605036A (en)
CH (1) CH427760A (en)
DE (1) DE1159405B (en)
DK (1) DK115319B (en)
GB (1) GB984194A (en)
LU (1) LU40261A1 (en)
NL (2) NL266073A (en)
SE (1) SE303738B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6692714B2 (en) 1997-10-17 2004-02-17 Suresh Shankarappa Vagarali High pressure/high temperature production of colorless and fancy-colored diamonds
US8961920B1 (en) 2011-04-26 2015-02-24 Us Synthetic Corporation Methods of altering the color of a diamond by irradiation and high-pressure/high-temperature processing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6129900A (en) * 1991-02-15 2000-10-10 Sumitomo Electric Industries, Ltd. Process for the synthesis of diamond

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6692714B2 (en) 1997-10-17 2004-02-17 Suresh Shankarappa Vagarali High pressure/high temperature production of colorless and fancy-colored diamonds
US7323156B2 (en) 1997-10-17 2008-01-29 Bellataire International, Llc High pressure/high temperature production of colorless and fancy-colored diamonds
US8961920B1 (en) 2011-04-26 2015-02-24 Us Synthetic Corporation Methods of altering the color of a diamond by irradiation and high-pressure/high-temperature processing
US10370252B1 (en) 2011-04-26 2019-08-06 Us Synthetic Corporation Methods of altering the color of a diamond by irradiation and high-pressure/high-temperature processing

Also Published As

Publication number Publication date
SE303738B (en) 1968-09-09
DE1159405B (en) 1963-12-19
BE605036A (en) 1961-10-02
LU40261A1 (en) 1961-08-14
DK115319B (en) 1969-09-29
NL131685C (en)
CH427760A (en) 1967-01-15
NL266073A (en)
JPS389552B1 (en) 1963-06-19

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