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FR2256900A1 - Polycrystalline diamond prodn. from diamond powder - at very high temp. and press. using diamond grains of different size and additives - Google Patents

Polycrystalline diamond prodn. from diamond powder - at very high temp. and press. using diamond grains of different size and additives

Info

Publication number
FR2256900A1
FR2256900A1 FR7400471A FR7400471A FR2256900A1 FR 2256900 A1 FR2256900 A1 FR 2256900A1 FR 7400471 A FR7400471 A FR 7400471A FR 7400471 A FR7400471 A FR 7400471A FR 2256900 A1 FR2256900 A1 FR 2256900A1
Authority
FR
France
Prior art keywords
diamond
pref
different size
prodn
additives
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.)
Granted
Application number
FR7400471A
Other languages
French (fr)
Other versions
FR2256900B1 (en
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.)
INST TUGOPLAVKIKH METALLOV
Original Assignee
INST TUGOPLAVKIKH METALLOV
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 INST TUGOPLAVKIKH METALLOV filed Critical INST TUGOPLAVKIKH METALLOV
Priority to FR7400471A priority Critical patent/FR2256900A1/en
Publication of FR2256900A1 publication Critical patent/FR2256900A1/en
Application granted granted Critical
Publication of FR2256900B1 publication Critical patent/FR2256900B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • B01J2203/062—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
    • B01J2203/065—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
    • B01J2203/0685—Crystal sintering

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

Polycrystalline diamond prodn. by applying high pressure to diamond powder at high temps. is improved in that the temp. is 2700-3700 degrees C (pref. 3100-3700 degrees C) and the pressure is equal to that at which graphite is converted into diamond, i.e. 120,000-170,000 atm. Alkaline earth cpds. can be added. Diamond grains of different size are mixed together. The application of higher press. and temp. compared with the known methods of producing polycrystalline diamonds improves the mechanical strength of the products, which are suitable for use in drilling tools. The wearing resistance is increased by the alkaline earth additions and by the use of diamond grains having different size. The pref. additives are fluorspar, limestone, chalk and talc; they are pref. applied in layers below and above the diamond powder layer. Pref. two diamond powder fractions are used having the size of 0.1-2.0 mu and 5-60 mu respectively; these fractions are used in a weight ratio of 20-80:80-20, pref. 50:50.
FR7400471A 1974-01-07 1974-01-07 Polycrystalline diamond prodn. from diamond powder - at very high temp. and press. using diamond grains of different size and additives Granted FR2256900A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7400471A FR2256900A1 (en) 1974-01-07 1974-01-07 Polycrystalline diamond prodn. from diamond powder - at very high temp. and press. using diamond grains of different size and additives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7400471A FR2256900A1 (en) 1974-01-07 1974-01-07 Polycrystalline diamond prodn. from diamond powder - at very high temp. and press. using diamond grains of different size and additives

Publications (2)

Publication Number Publication Date
FR2256900A1 true FR2256900A1 (en) 1975-08-01
FR2256900B1 FR2256900B1 (en) 1978-03-31

Family

ID=9133178

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7400471A Granted FR2256900A1 (en) 1974-01-07 1974-01-07 Polycrystalline diamond prodn. from diamond powder - at very high temp. and press. using diamond grains of different size and additives

Country Status (1)

Country Link
FR (1) FR2256900A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998046344A1 (en) * 1997-04-17 1998-10-22 De Beers Industrial Diamond Division (Proprietary) Limited Sintering process for diamond and diamond growth

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998046344A1 (en) * 1997-04-17 1998-10-22 De Beers Industrial Diamond Division (Proprietary) Limited Sintering process for diamond and diamond growth
US6270548B1 (en) 1997-04-17 2001-08-07 James Wilbert Campbell Sintering process for diamond and diamond growth

Also Published As

Publication number Publication date
FR2256900B1 (en) 1978-03-31

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Legal Events

Date Code Title Description
ST Notification of lapse