GB377239A - An improved process for producing diamonds - Google Patents

An improved process for producing diamonds

Info

Publication number
GB377239A
GB377239A GB201831A GB201831A GB377239A GB 377239 A GB377239 A GB 377239A GB 201831 A GB201831 A GB 201831A GB 201831 A GB201831 A GB 201831A GB 377239 A GB377239 A GB 377239A
Authority
GB
United Kingdom
Prior art keywords
carbon
pressure
melt
atmospheres
dioxide
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
GB201831A
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.)
MAURICE ESTERHAZY
WILLIAM FRANCIS HEVESY
Original Assignee
MAURICE ESTERHAZY
WILLIAM FRANCIS HEVESY
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
Priority to AT377239X priority Critical
Application filed by MAURICE ESTERHAZY, WILLIAM FRANCIS HEVESY filed Critical MAURICE ESTERHAZY
Publication of GB377239A publication Critical patent/GB377239A/en
Application status is Expired legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/06Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
    • B01J3/062Processes 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2203/00Processes utilising sub- or super atmospheric pressure
    • B01J2203/06High pressure synthesis
    • B01J2203/0605Composition of the material to be processed
    • B01J2203/061Graphite
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2203/00Processes utilising sub- or super atmospheric pressure
    • B01J2203/06High pressure synthesis
    • B01J2203/065Composition of the material produced
    • B01J2203/0655Diamond
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2203/00Processes utilising sub- or super atmospheric pressure
    • B01J2203/06High pressure synthesis
    • B01J2203/0675Structural or physico-chemical features of the materials processed
    • B01J2203/068Crystal growth

Abstract

<PICT:0377239/III/1> Diamonds are produced artificially from melts capable of yielding carbon in a free condition by subjecting the melt to increases and decreases of pressure, the decreases in pressure being made more rapidly than the increases. Amorphous carbon, e.g. graphite, is added to the melt, which may be of iron, nickel, cobalt, silver or silicates, together with a carbon compound, e.g. solid carbon dioxide or liquid carbon monoxide, also supplied during the operation. The final temperature attained is about 1000 DEG C. and the pressure may vary from 500 atmospheres to a final pressure of 15000 atmospheres. The melt is preferably composed of materials which act catalytically and easily dissolve the carbon compounds, e.g. iron, nickel, cobalt and their oxides. In an example, a melt consisting of 60 to 90 per cent of iron filings, 25 to 5 of blast furnace slag, and 15 to 5 of amorphous carbon is placed in a chamber 5 in a steel block 1 together with 30 per cent of solid carbon dioxide. Secured to the upper block 1 by insulated bolts 8 and separated therefrom by an insulating layer 4 is a lower steel block 2, a tubular passage 10 for carbon monoxide or dioxide being provided therein. Pressure is furnished by a hydraulic ram 3 provided with packing 9 and also by the gas supplied. Heating is effected by the resistance of the blocks 1, 2 to current supplied by leads 6, 7. In operation, the melt is liquefied by heating to about 1000 DEG C. and a pressure of 5000 atmospheres is applied, some of the carbon and the carbon dioxide dissolved giving rise to the production of carbon monoxide. Pressure is now increased to 15000 atmospheres over a period of 90 seconds during which time carbon monoxide is converted to carbon and dioxide. After a further period of 10 to 20 seconds, the heating and pressure are simultaneously interrupted, the sudden release of pressure which is effected serving to prevent carbon in the diamond form reverting to the amorphous form. This procedure is repeated three or four times.
GB201831A 1930-01-21 1931-01-21 An improved process for producing diamonds Expired GB377239A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT377239X 1930-01-21

Publications (1)

Publication Number Publication Date
GB377239A true GB377239A (en) 1932-07-21

Family

ID=3673069

Family Applications (1)

Application Number Title Priority Date Filing Date
GB201831A Expired GB377239A (en) 1930-01-21 1931-01-21 An improved process for producing diamonds

Country Status (1)

Country Link
GB (1) GB377239A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2947609A (en) * 1958-01-06 1960-08-02 Gen Electric Diamond synthesis
US2947608A (en) * 1955-08-29 1960-08-02 Gen Electric Diamond synthesis
US2947611A (en) * 1958-01-06 1960-08-02 Gen Electric Diamond synthesis
US2996763A (en) * 1956-01-31 1961-08-22 Gen Electric Diamond material
US3030187A (en) * 1958-07-23 1962-04-17 Union Carbide Corp Synthesis of diamond
US3030188A (en) * 1958-07-23 1962-04-17 Union Carbide Corp Synthesis of diamond

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2947608A (en) * 1955-08-29 1960-08-02 Gen Electric Diamond synthesis
US2996763A (en) * 1956-01-31 1961-08-22 Gen Electric Diamond material
US2947609A (en) * 1958-01-06 1960-08-02 Gen Electric Diamond synthesis
US2947611A (en) * 1958-01-06 1960-08-02 Gen Electric Diamond synthesis
US3030187A (en) * 1958-07-23 1962-04-17 Union Carbide Corp Synthesis of diamond
US3030188A (en) * 1958-07-23 1962-04-17 Union Carbide Corp Synthesis of diamond

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