EP0000661A1 - Making silicon carbide and silicon carbide so made - Google Patents

Making silicon carbide and silicon carbide so made Download PDF

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Publication number
EP0000661A1
EP0000661A1 EP78300197A EP78300197A EP0000661A1 EP 0000661 A1 EP0000661 A1 EP 0000661A1 EP 78300197 A EP78300197 A EP 78300197A EP 78300197 A EP78300197 A EP 78300197A EP 0000661 A1 EP0000661 A1 EP 0000661A1
Authority
EP
European Patent Office
Prior art keywords
silicon carbide
carbonaceous material
making
making silicon
atmospheres
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.)
Withdrawn
Application number
EP78300197A
Other languages
German (de)
English (en)
French (fr)
Inventor
Paul Grieveson
Roger John Pomfret
John Taylor
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Publication of EP0000661A1 publication Critical patent/EP0000661A1/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/90—Carbides
    • C01B32/914—Carbides of single elements
    • C01B32/956—Silicon carbide
    • C01B32/963—Preparation from compounds containing silicon
    • C01B32/97—Preparation from SiO or SiO2

Definitions

  • This invention is about making silicon carbide.
  • silicon carbide is made by heating a powdered mixture of high-grade silica sand and high-grade carbon such as anthracite or petroleum coke. Temperatures of 2000 - 2500 C have to be sustained for a day or more, and the yield is far short of 100%. We tentatively believe that gaseous silicon species, on contacting a carbon particle, form silicon carbide which thus soon envelopes the particle. Further conversion of that particle must then depend on solid-state diffusion through its silicon-carbide envelope, hence the slow reaction and high temperatures required.
  • high-grade silica sand and high-grade carbon such as anthracite or petroleum coke.
  • the invention is making silicon carbide by heating a mixture of silica with a carbonaceous material at from 1350°C to 1550 0 C under a partial pressure of carbon monoxide, measured in atmospheres, not exceeding ten raised to the power (8.6 - 15600/T) where T is the temperature in degrees Kelvin, the carbonaceous material being such that a specimen thereof loses (by oxidation) at least 40mg/cm 2 /sec of carbon in excess carbon dioxide at 1 atmosphere pressure at 1450 C.
  • the silicon carbide so made is in the form of fine particles of ⁇ -phase, which has a cubic crystal structure.
  • a preferred temperature range having regard to such factors as today's technical capabilities, relative costs and interest rates, is from 1400°C to 1500°C, and a most preferred range is from 1420°C to 1480°C, with an optimum at around 1450°C, where complete reaction may typically take some 40 minutes (compared with 10 minutes at. 1500°C, and a few hours for an incomplete reaction at 1350 C).
  • the maximum partial pressure of carbon monoxide which can be used according to the invention is as follows:
  • the carbonaceous material may for example be coal (including for example lignite), rice husks (which have a negative cost at present, inasmuch as contractors are paid to dump them), and coconut charcoal.
  • the carbonaceous material must not be any of the following (for example): petroleum coke without additions, high-grade anthracite, and spectroscopically pure graphite without additions; the reactivity of these is too low.
  • Electrode graphite is a borderline material, which it is on the whole preferred to eschew.
  • the carbonaceous material must have a reactivity of at least 40mg/cm /sec on the basis explained above, and the reactivities of coconut charcoal and spectroscopically pure graphite are 70 and 3mg/cm 2 /sec respectively on the same basis.
  • the silicon carbide made according to the invention may be exploited, for instance, as a raw material in the refractories and abrasives industries.
  • the crucible charge then contained cubic ⁇ -silicon carbide of.good purity in fine powder form, and contained no silica (cristobalite) according to X-ray diffraction investigations; in other words, all the silicon had been converted.
  • the furnace was evacuated and then heated to 1450°C and its bed was fluidised with excess pure carbon dioxide at 1 atmosphere.
  • the Buffalo Nuts began to oxidise according to the reaction C + CO 2 ⁇ 2CO, and after a set time the heating and gas were stopped.
  • the weight loss of the Buffalo Nuts was found to be 80mg/cm 2 /sec.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Carbon And Carbon Compounds (AREA)
EP78300197A 1977-07-27 1978-07-25 Making silicon carbide and silicon carbide so made Withdrawn EP0000661A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3158377 1977-07-27
GB3158377 1977-07-27

Publications (1)

Publication Number Publication Date
EP0000661A1 true EP0000661A1 (en) 1979-02-07

Family

ID=10325295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300197A Withdrawn EP0000661A1 (en) 1977-07-27 1978-07-25 Making silicon carbide and silicon carbide so made

Country Status (4)

Country Link
EP (1) EP0000661A1 (it)
JP (1) JPS5425300A (it)
IT (1) IT1107474B (it)
NO (1) NO782569L (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4283375A (en) * 1980-01-28 1981-08-11 Great Lakes Carbon Corporation Production of SiC whiskers
US5190737A (en) * 1989-01-11 1993-03-02 The Dow Chemical Company High yield manufacturing process for silicon carbide
EP0543751A1 (fr) * 1991-11-21 1993-05-26 PECHINEY RECHERCHE (Groupement d'Intérêt Economique régi par l'Ordonnance du 23 Septembre 1967) Immeuble Balzac Procédé de fabrication de carbures métalliques à grande surface spécifique sous balayage de gaz inerte à pression atmosphérique
US5340417A (en) * 1989-01-11 1994-08-23 The Dow Chemical Company Process for preparing silicon carbide by carbothermal reduction
WO2023060294A1 (de) 2021-10-15 2023-04-20 Ebner Industrieofenbau Gmbh Industrieofenanlage

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0682286B2 (ja) * 1985-10-28 1994-10-19 株式会社神戸製鋼所 ロボツト制御装置
DE4030954C2 (de) * 1990-09-29 1994-08-04 Danfoss As Verfahren zur Steuerung der Bewegung eines hydraulisch bewegbaren Arbeitsgeräts und Bahnsteuereinrichtung zur Durchführung des Verfahrens
EP2470473B1 (en) * 2009-08-26 2017-12-20 LG Innotek Co., Ltd. Method for manufacturing silicon carbide pulverulent body

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU138238A1 (ru) * 1960-01-29 1960-11-30 Е.А. Вуколов Способ получени карбида кремни
AT260170B (de) * 1964-10-14 1968-02-12 Du Pont Verfahren zur Herstellung von Siliziumkarbid
GB1105882A (en) * 1965-03-10 1968-03-13 Corning Glass Works Manufacture of silicon carbide fibres
DE1567593A1 (de) * 1965-04-27 1969-10-09 Ionics Herstellung von Siliciumcarbid geringer Korngroesse
DE2052507A1 (de) * 1970-10-26 1972-05-10 Sued Chemie Ag Verfahren zur Herstellung von Aktivkohle
US3754076A (en) * 1970-10-30 1973-08-21 Univ Utah Production of silicon carbide from rice hulls

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU138238A1 (ru) * 1960-01-29 1960-11-30 Е.А. Вуколов Способ получени карбида кремни
AT260170B (de) * 1964-10-14 1968-02-12 Du Pont Verfahren zur Herstellung von Siliziumkarbid
GB1105882A (en) * 1965-03-10 1968-03-13 Corning Glass Works Manufacture of silicon carbide fibres
DE1567593A1 (de) * 1965-04-27 1969-10-09 Ionics Herstellung von Siliciumcarbid geringer Korngroesse
DE2052507A1 (de) * 1970-10-26 1972-05-10 Sued Chemie Ag Verfahren zur Herstellung von Aktivkohle
US3754076A (en) * 1970-10-30 1973-08-21 Univ Utah Production of silicon carbide from rice hulls

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4283375A (en) * 1980-01-28 1981-08-11 Great Lakes Carbon Corporation Production of SiC whiskers
US5190737A (en) * 1989-01-11 1993-03-02 The Dow Chemical Company High yield manufacturing process for silicon carbide
US5340417A (en) * 1989-01-11 1994-08-23 The Dow Chemical Company Process for preparing silicon carbide by carbothermal reduction
EP0543751A1 (fr) * 1991-11-21 1993-05-26 PECHINEY RECHERCHE (Groupement d'Intérêt Economique régi par l'Ordonnance du 23 Septembre 1967) Immeuble Balzac Procédé de fabrication de carbures métalliques à grande surface spécifique sous balayage de gaz inerte à pression atmosphérique
AU651256B2 (en) * 1991-11-21 1994-07-14 Centre National De La Recherche Scientifique Process for the production of metal carbides having a large specific surface under atmospheric pressure inert gas scavenging
WO2023060294A1 (de) 2021-10-15 2023-04-20 Ebner Industrieofenbau Gmbh Industrieofenanlage

Also Published As

Publication number Publication date
JPS5425300A (en) 1979-02-26
IT1107474B (it) 1985-11-25
NO782569L (no) 1979-01-30
IT7850447A0 (it) 1978-07-24

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): BE CH DE FR GB NL SE

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn
RIN1 Information on inventor provided before grant (corrected)

Inventor name: POMFRET, ROGER JOHN

Inventor name: GRIEVESON, PAUL

Inventor name: TAYLOR, JOHN