GB936174A - Metal coating of refractory oxide particles - Google Patents

Metal coating of refractory oxide particles

Info

Publication number
GB936174A
GB936174A GB10026/62A GB1002662A GB936174A GB 936174 A GB936174 A GB 936174A GB 10026/62 A GB10026/62 A GB 10026/62A GB 1002662 A GB1002662 A GB 1002662A GB 936174 A GB936174 A GB 936174A
Authority
GB
United Kingdom
Prior art keywords
particles
coating
metal compound
metal
fluidized
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
GB10026/62A
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 Beryllia Corp
Original Assignee
National Beryllia Corp
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 Beryllia Corp filed Critical National Beryllia Corp
Publication of GB936174A publication Critical patent/GB936174A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/28—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from gaseous metal compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/18—Non-metallic particles coated with metal
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/442—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using fluidised bed process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Inorganic Fibers (AREA)

Abstract

A process for coating particles of refractory oxides, particularly beryllia and alumina or blends thereof with metal by forming a fluidized suspension of the oxide particles with hydrogen, heating the fluidized particles and introducing a current of decomposable gaseous metal compound into the fluidized suspension, the temperature of the fluidized particles being at least that temperature at which the metal compound decomposes under the reducing conditions obtaining, whereby the metal compound decomposes on contact with said heated particles to deposit metal in situ on the particles and substantially completely coats the particles in said metal. The gaseous metal compound may be tungsten hexafluoride, WF6, or it may be molybdenum hexafluoride or tantalum pentafluoride. The oxide particles may be in the form of powder or fibres; when the particles are in powder form a suitable size is - 100 to + 325 mesh and when in fibre form the cross-sectional diameter should be 100-1000 microns. Coating thicknesses may be from 1-20 microns and the proportion of H2/WF6 in the gaseous flow on a volume basis, is about 10 or more. The Specification also refers to the coating of BeO and Al2O3 by chromium. A coating temperature of 600 DEG C. is quoted.
GB10026/62A 1961-04-21 1962-03-15 Metal coating of refractory oxide particles Expired GB936174A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10461861A 1961-04-21 1961-04-21

Publications (1)

Publication Number Publication Date
GB936174A true GB936174A (en) 1963-09-04

Family

ID=22301438

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10026/62A Expired GB936174A (en) 1961-04-21 1962-03-15 Metal coating of refractory oxide particles

Country Status (1)

Country Link
GB (1) GB936174A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343979A (en) * 1965-10-22 1967-09-26 Jr Charles E Hamrin Method for depositing a tungsten-rhenium metal alloy on a substrate
US4360565A (en) * 1977-09-28 1982-11-23 Phillips Petroleum Company Iron-containing refractory balls for retorting oil shale
US4371481A (en) 1979-02-06 1983-02-01 Phillips Petroleum Company Iron-containing refractory balls for retorting oil shale
US4402886A (en) 1980-11-24 1983-09-06 Phillips Petroleum Company Tron-containing refractory balls for retorting oil shale
US4421701A (en) 1980-11-24 1983-12-20 Phillips Petroleum Company Process for preparing iron-containing refractory balls for retorting oil shale
US4438161A (en) 1980-11-24 1984-03-20 Phillips Petroleum Company Iron-containing refractory balls for retorting oil shale

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343979A (en) * 1965-10-22 1967-09-26 Jr Charles E Hamrin Method for depositing a tungsten-rhenium metal alloy on a substrate
US4360565A (en) * 1977-09-28 1982-11-23 Phillips Petroleum Company Iron-containing refractory balls for retorting oil shale
US4371481A (en) 1979-02-06 1983-02-01 Phillips Petroleum Company Iron-containing refractory balls for retorting oil shale
US4402886A (en) 1980-11-24 1983-09-06 Phillips Petroleum Company Tron-containing refractory balls for retorting oil shale
US4421701A (en) 1980-11-24 1983-12-20 Phillips Petroleum Company Process for preparing iron-containing refractory balls for retorting oil shale
US4438161A (en) 1980-11-24 1984-03-20 Phillips Petroleum Company Iron-containing refractory balls for retorting oil shale

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