GB983911A - Improvements in or relating to the manufacture of bodies comprising silicon carbide and/or a high melting transition metal silicide - Google Patents

Improvements in or relating to the manufacture of bodies comprising silicon carbide and/or a high melting transition metal silicide

Info

Publication number
GB983911A
GB983911A GB794661A GB794661A GB983911A GB 983911 A GB983911 A GB 983911A GB 794661 A GB794661 A GB 794661A GB 794661 A GB794661 A GB 794661A GB 983911 A GB983911 A GB 983911A
Authority
GB
United Kingdom
Prior art keywords
phosphoric acid
fixing agent
melting
transition metal
metal silicide
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
GB794661A
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.)
Siemens Plania Werke AG
Original Assignee
Siemens Plania Werke AG
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 claimed from DES67418A external-priority patent/DE1176545B/en
Priority claimed from DE1960S0067912 external-priority patent/DE1246509B/en
Application filed by Siemens Plania Werke AG filed Critical Siemens Plania Werke AG
Publication of GB983911A publication Critical patent/GB983911A/en
Expired legal-status Critical Current

Links

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
    • C04B41/5076—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 with masses bonded by inorganic cements
    • C04B41/5092—Phosphate cements
    • 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
    • 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
    • C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Catalysts (AREA)
  • Fuel Cell (AREA)
  • Laminated Bodies (AREA)

Abstract

The resistance of a body of silicon carbide and/or a high-melting transition metal silicide oxidative decomposition is increased by depositing in and/or on the body phosphoric acid and/or a phosphate. The high-melting transition metal silicide is from a metal of Groups IVB, VB or VIB of the Periodic Table (Handbook of Chemistry and Physics, 44th Edn., page 448) and has a melting-point above 1000 DEG C., e.g. molybdenum or titanium silicide. The impregnation with phosphoric acid may take place in vacuo, and preferably at least two impregnations take place, the body being heated after each impregnation. A fixing agent may also be used with the phosphoric acid, this being to prevent evaporation of the phosphoric acid when heated either by forming an impervious coating on the body, or by reacting with the phosphoric acid to form a heat-stable coating. The fixing agent may be a high-melting oxide, or a compound which is converted on heating in air to a high-melting oxide, e.g. alumina, aluminum hydroxide, zirconium oxide, zirconium silicate, silicon dioxide, silica gel, polyethyl silicate, aluminium phosphate, borax, titanium silicide, or a synthetic resin may be used, e.g. that formed from furfuryl alcohol and phosphoric acid at 80 DEG C. The fixing agent may also be used in conjunction with a bonding agent, i.e. an adhesive substance to prevent the fixing agent and protective coating formed from being detached from the body. The bonding agent may be polyvinyl acetate, polyvinyl alcohol, dextrin, or nitrocellulose. The impregnations with the various materials may be in any order or all together.ALSO:The resistance of a body of silicon carbide and/or a high-melting transition metal silicide to oxidative decomposition is increased by depositing in and/or on the body phosphoric acid and/or a phosphate. The high-melting transition metal silicide is from a metal of Group IVb, Vb or VIb of the Periodic Table (Handbook of Chemistry and Physics, 44th Edn., page 448) and has a melting point above 1000 DEG C., e.g. molybdenum or titanium silicide. The impregnation with phosphoric acid may take place in vacuo, and preferably at least two impregnations take place, the body being heated after each impregnation. A fixing agent may also be used with the phosphoric acid, this being to prevent evaporation of the phosphoric acid when heated either by forming an impervious coating on the body, or by reacting with the phosphoric acid to form a heat-stable coating. The fixing agent may be a high melting oxide, e.g. alumina, aluminium hydroxide, zirconium oxide, zirconium silicate, silicon dioxide, silica gel, polyethyl silicate, aluminium phosphate, borax, titanium silicide, or a synthetic resin may be used, e.g. that formed from furfuryl alcohol and phosphoric acid at 80 DEG C. The fixing agent may also be used in conjunction with a bonding agent, i.e. an adhesive substance, to prevent the fixing agent and protective coating formed from being detached from the body. The bonding agent may be polyvinyl acetate, polyvinyl alcohol, dextrin, or nitrocellulose. The impregnations with the various materials may be in any order or all together.
GB794661A 1960-03-04 1961-03-03 Improvements in or relating to the manufacture of bodies comprising silicon carbide and/or a high melting transition metal silicide Expired GB983911A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DES67418A DE1176545B (en) 1960-03-04 1960-03-04 Process for protecting a body containing molybdenum silicide from oxidative decay
DE1960S0067912 DE1246509B (en) 1960-04-04 1960-04-04 Method for reducing the thermal aging of a heating conductor consisting essentially of silicon carbide

Publications (1)

Publication Number Publication Date
GB983911A true GB983911A (en) 1965-02-17

Family

ID=25996002

Family Applications (1)

Application Number Title Priority Date Filing Date
GB794661A Expired GB983911A (en) 1960-03-04 1961-03-03 Improvements in or relating to the manufacture of bodies comprising silicon carbide and/or a high melting transition metal silicide

Country Status (1)

Country Link
GB (1) GB983911A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206572A (en) * 1987-06-26 1989-01-11 Tokai Carbon Kk Surface coated silicon carbide whiskers
WO1997042135A1 (en) * 1996-05-02 1997-11-13 Alliedsignal Inc. Improved oxidation protection for carbon/carbon composites and graphites
US5962135A (en) * 1997-04-09 1999-10-05 Alliedsignal Inc. Carbon/carbon friction material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206572A (en) * 1987-06-26 1989-01-11 Tokai Carbon Kk Surface coated silicon carbide whiskers
GB2206572B (en) * 1987-06-26 1991-07-31 Tokai Carbon Kk Surface-coated sic whiskers, processes for preparing the same, ceramic reinforced with the same, and process for preparing said reinforced ceramic
WO1997042135A1 (en) * 1996-05-02 1997-11-13 Alliedsignal Inc. Improved oxidation protection for carbon/carbon composites and graphites
US5962135A (en) * 1997-04-09 1999-10-05 Alliedsignal Inc. Carbon/carbon friction material

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