GB779474A - Method of preparing silicon nitride articles by slip casting - Google Patents

Method of preparing silicon nitride articles by slip casting

Info

Publication number
GB779474A
GB779474A GB20228/55A GB2022855A GB779474A GB 779474 A GB779474 A GB 779474A GB 20228/55 A GB20228/55 A GB 20228/55A GB 2022855 A GB2022855 A GB 2022855A GB 779474 A GB779474 A GB 779474A
Authority
GB
United Kingdom
Prior art keywords
silicon
per cent
slip
suspension
particle size
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
GB20228/55A
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.)
Dow Wilton Ltd
Original Assignee
Union Carbide Ltd
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 Union Carbide Ltd filed Critical Union Carbide Ltd
Publication of GB779474A publication Critical patent/GB779474A/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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
    • C04B35/591—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride obtained by reaction sintering
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
    • C22C32/0068—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only nitrides

Abstract

Articles are cast from silicon or silicon nitride or a mixture of both by a method in which a suspension of the powdered substance is formed in a suitable medium. e.g. water, a peptizing agent is added to adjust the pH of the slip to between 7,5 and 10, the slip is poured into a mould and the cast article is removed therefrom. The article is then nitrided by heating it in nitrogen, preferably at a temperature of 1175 DEG C. followed by 1300 DEG C. Silicon must be comminuted to a particle size of not more than 5 microns, 3 microns being a preferable maximum, and should be commercially pure (97 per cent), and the specific gravity of the aqueous suspension should be as high as possible, i.e. the silicon content should be 60 per cent to 70 per cent by weight. The peptizing agent renders the slip sufficiently fluid for pouring and may be added either before or after the powder is introduced into the suspension medium, the quantity ranging from 0,01 per cent to 1 per cent by weight of the medium. Suitable peptizing agents to give the above pH range are monoethanolamine, sodium hexametaphosphate and sodium pyrophosphate. The particle size for silicon nitride is 100-325 mesh. For bonding purposes a minimum of 1 per cent silicon, of 5 or less micron particle size, should be added to the suspension. Three examples, specifying proportions of ingredients by weight, are given of making castings from slip of silicon or silicon metal.
GB20228/55A 1954-07-29 1955-07-13 Method of preparing silicon nitride articles by slip casting Expired GB779474A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US779474XA 1954-07-29 1954-07-29

Publications (1)

Publication Number Publication Date
GB779474A true GB779474A (en) 1957-07-24

Family

ID=22140957

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20228/55A Expired GB779474A (en) 1954-07-29 1955-07-13 Method of preparing silicon nitride articles by slip casting

Country Status (1)

Country Link
GB (1) GB779474A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854189A (en) * 1973-12-20 1974-12-17 Ford Motor Co Method of making a bonded silicon nitride article having portions of different density
DE2617336A1 (en) * 1975-04-25 1976-11-04 Ford Werke Ag METHOD OF MANUFACTURING A SILICON NITRITE PRODUCT WITH TWO DIFFERENT DENSITY
US4217320A (en) * 1976-12-22 1980-08-12 Ford Motor Company Slip cast article manufacturing method
US4268466A (en) * 1977-03-25 1981-05-19 Ford Motor Company Method of forming a slip cast article of cellular construction
US4471060A (en) * 1983-07-08 1984-09-11 Ford Motor Company Method of forming a relatively stable slip of silicon metal particles and yttrium containing particles
US4943401A (en) * 1987-12-21 1990-07-24 Eaton Corporation Process for making silicon nitride articles
US5079198A (en) * 1990-07-24 1992-01-07 Eaton Corporation Ceramic phase in sintered silicon nitride containing cerium, aluminum, and iron
US5160719A (en) * 1990-07-24 1992-11-03 Eaton Corporation Process for nitriding silicon containing materials
US5164138A (en) * 1982-09-30 1992-11-17 Heliotronic Forschungs- Und Entwicklungsgesellschaft Fur Solarzellen-Grundstoffe Mbh Material comprising silicon and process for its manufacture
US5252248A (en) * 1990-07-24 1993-10-12 Eaton Corporation Process for preparing a base nitridable silicon-containing material
WO1995008519A2 (en) * 1993-09-17 1995-03-30 Saint Gobain/Norton Industrial Ceramics Corporation Coarse reaction bonded silicon nitride
US6007789A (en) * 1992-11-03 1999-12-28 Eaton Corporation Method of nitriding silicon

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854189A (en) * 1973-12-20 1974-12-17 Ford Motor Co Method of making a bonded silicon nitride article having portions of different density
DE2617336A1 (en) * 1975-04-25 1976-11-04 Ford Werke Ag METHOD OF MANUFACTURING A SILICON NITRITE PRODUCT WITH TWO DIFFERENT DENSITY
US4217320A (en) * 1976-12-22 1980-08-12 Ford Motor Company Slip cast article manufacturing method
US4268466A (en) * 1977-03-25 1981-05-19 Ford Motor Company Method of forming a slip cast article of cellular construction
US5164138A (en) * 1982-09-30 1992-11-17 Heliotronic Forschungs- Und Entwicklungsgesellschaft Fur Solarzellen-Grundstoffe Mbh Material comprising silicon and process for its manufacture
US4471060A (en) * 1983-07-08 1984-09-11 Ford Motor Company Method of forming a relatively stable slip of silicon metal particles and yttrium containing particles
US4943401A (en) * 1987-12-21 1990-07-24 Eaton Corporation Process for making silicon nitride articles
US5079198A (en) * 1990-07-24 1992-01-07 Eaton Corporation Ceramic phase in sintered silicon nitride containing cerium, aluminum, and iron
US5160719A (en) * 1990-07-24 1992-11-03 Eaton Corporation Process for nitriding silicon containing materials
US5252248A (en) * 1990-07-24 1993-10-12 Eaton Corporation Process for preparing a base nitridable silicon-containing material
US6007789A (en) * 1992-11-03 1999-12-28 Eaton Corporation Method of nitriding silicon
WO1995008519A2 (en) * 1993-09-17 1995-03-30 Saint Gobain/Norton Industrial Ceramics Corporation Coarse reaction bonded silicon nitride
WO1995008519A3 (en) * 1993-09-17 1995-05-04 Saint Gobain Norton Ind Cerami Coarse reaction bonded silicon nitride

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