GB2231885A - Protective carbide coatings for carbon elements - Google Patents

Protective carbide coatings for carbon elements Download PDF

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Publication number
GB2231885A
GB2231885A GB8911882A GB8911882A GB2231885A GB 2231885 A GB2231885 A GB 2231885A GB 8911882 A GB8911882 A GB 8911882A GB 8911882 A GB8911882 A GB 8911882A GB 2231885 A GB2231885 A GB 2231885A
Authority
GB
United Kingdom
Prior art keywords
carbide
carbon
heating
protective
powder
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Withdrawn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
GB8911882A
Other versions
GB8911882D0 (en
Inventor
Ian Higgins
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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 UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB8911882A priority Critical patent/GB2231885A/en
Publication of GB8911882D0 publication Critical patent/GB8911882D0/en
Publication of GB2231885A publication Critical patent/GB2231885A/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5053—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials non-oxide ceramics
    • C04B41/5057—Carbides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5053—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials non-oxide ceramics
    • C04B41/5057—Carbides
    • C04B41/5059—Silicon carbide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • C04B41/87—Ceramics

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Resistance Heating (AREA)

Abstract

A method of coating a carbon element with a protective layer comprises forming a carbide layer on the surface of the element, the carbide layer being formed by painting the carbon element with, for example, a suspension of a powder of a non-metallic element or a refractory metal followed by heating. The powder may be silicon or boron nitride which form silicon carbide or boron carbide respectively or tungsten which yields tungsten carbide on heating. In particular carbon furnace elements such as electrodes are so treated to improve their corrosion resistance.

Description

Protective Coatings for Carbon Elements The present invention concerns protective coatings for carbon elements. In particular, the invention concerns corrosion resistant coatings for carbon furnace elements in order to prolong the working life of such elements.
According to one aspect of the present invention a method of coating a carbon element with a protective layer comprises forming a carbide layer on the surface of the carbon element.
Preferably the carbide layer comprises a carbide of a non-metallic element such as silicon carbide or boron carbide. Conveniently, the carbide layer is formed by covering, as by painting, the carbon element with a thick aqueous slip or suspension of the non-metallic element followed by heating, for example, in a furnace or oven under normal operating conditions. Alternatively, the coated elements can be baked in vacuum at a temperature which can be in the region of 1650it with a heating time of about two hours. The slip or suspension preferably includes carboxymethyl cellulose as a dispersant and conveniently the slip or suspension comprises 4 parts carboxymethyl cellulose powder to 96 parts water by weight. The powder of the non-metallic element is added to form a thick slip or suspension.The powder can be silicon or boron nitride which form silicon carbide or boron carbide respectively when heated under the above conditions. However, this is not exhaustive of possible powders suitable for the formation of the protective carbide layer. For example, at higher temperatures the protective layer can be formed from a refractory metal slip such as tungsten which yields tungsten carbide at elevated heating.
In one particular application, the carbon elements to be protected can be electrodes for heating a muffle furnace. Such a furnace employs a nitrogen atmosphere and tests with carbon electrodes coated with a protective layer of non-metallic carbide and identical electrodes without such a layer indicate that the coated electrodes are less prone to corrosion and have an enhanced working life. The coatings also provide protection in furnaces where silica-containing refractory bricks are used, that is where there is a significant silicon monoxide partial pressure in addition to nitrogen.
Nonumber

Claims (3)

  1. Claims 1. A method of coating a carbon element with a protective layer which comprises forming a carbide layer on the surface of the carbon element.
  2. 2. A method as claimed in Claim 1 which comprises coating the carbon element with a carbide of a non-metallic element such as silicon carbide or boron carbide.
  3. 3. A method of coating a carbon element with a protective layer as claimed in Claim 1 or Claim 2 and substantially as herein described.
GB8911882A 1989-05-24 1989-05-24 Protective carbide coatings for carbon elements Withdrawn GB2231885A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8911882A GB2231885A (en) 1989-05-24 1989-05-24 Protective carbide coatings for carbon elements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8911882A GB2231885A (en) 1989-05-24 1989-05-24 Protective carbide coatings for carbon elements

Publications (2)

Publication Number Publication Date
GB8911882D0 GB8911882D0 (en) 1989-07-12
GB2231885A true GB2231885A (en) 1990-11-28

Family

ID=10657248

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8911882A Withdrawn GB2231885A (en) 1989-05-24 1989-05-24 Protective carbide coatings for carbon elements

Country Status (1)

Country Link
GB (1) GB2231885A (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788893A (en) * 1968-03-21 1974-01-29 Gen Electric Coated filaments
US3811927A (en) * 1971-03-10 1974-05-21 Great Lakes Carbon Corp Process for vapor deposition on glassy-carbon substrate
GB1417134A (en) * 1972-11-20 1975-12-10 Nippon Oil Seal Ind Co Ltd Production of shaped silicon carbide articles
US4045597A (en) * 1972-03-01 1977-08-30 Avco Corporation Process for modifying amorphous carbon filaments
EP0176055A1 (en) * 1984-09-24 1986-04-02 Air Products And Chemicals, Inc. Oxidation resistant carbon body and method for making same
US4591514A (en) * 1982-09-10 1986-05-27 Air Products And Chemicals, Inc. Method for making self-protecting carbon bodies
US4702784A (en) * 1982-06-15 1987-10-27 Kernforschungsanlage Julich Gesellschaft Mit Beschrnakter Haftung Process for production of a tungsten carbide-activated electrode
EP0294047A1 (en) * 1987-05-14 1988-12-07 Dow Corning Corporation Minimizing carbon content of semiconductor materials
US4871587A (en) * 1982-06-22 1989-10-03 Harry Levin Process for coating an object with silicon carbide

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788893A (en) * 1968-03-21 1974-01-29 Gen Electric Coated filaments
US3811927A (en) * 1971-03-10 1974-05-21 Great Lakes Carbon Corp Process for vapor deposition on glassy-carbon substrate
US4045597A (en) * 1972-03-01 1977-08-30 Avco Corporation Process for modifying amorphous carbon filaments
GB1417134A (en) * 1972-11-20 1975-12-10 Nippon Oil Seal Ind Co Ltd Production of shaped silicon carbide articles
US4702784A (en) * 1982-06-15 1987-10-27 Kernforschungsanlage Julich Gesellschaft Mit Beschrnakter Haftung Process for production of a tungsten carbide-activated electrode
US4871587A (en) * 1982-06-22 1989-10-03 Harry Levin Process for coating an object with silicon carbide
US4591514A (en) * 1982-09-10 1986-05-27 Air Products And Chemicals, Inc. Method for making self-protecting carbon bodies
EP0176055A1 (en) * 1984-09-24 1986-04-02 Air Products And Chemicals, Inc. Oxidation resistant carbon body and method for making same
EP0294047A1 (en) * 1987-05-14 1988-12-07 Dow Corning Corporation Minimizing carbon content of semiconductor materials

Also Published As

Publication number Publication date
GB8911882D0 (en) 1989-07-12

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)