GB1470949A - Method of making a duo-density silicon nitride article - Google Patents

Method of making a duo-density silicon nitride article

Info

Publication number
GB1470949A
GB1470949A GB912176A GB912176A GB1470949A GB 1470949 A GB1470949 A GB 1470949A GB 912176 A GB912176 A GB 912176A GB 912176 A GB912176 A GB 912176A GB 1470949 A GB1470949 A GB 1470949A
Authority
GB
United Kingdom
Prior art keywords
blade ring
silicon nitride
die
bonding surface
rotor
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
GB912176A
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.)
Ford Motor Co Ltd
Ford Motor Co
Original Assignee
Ford Motor Co Ltd
Ford Motor Co
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 Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Motor Co Ltd
Publication of GB1470949A publication Critical patent/GB1470949A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/34—Rotor-blade aggregates of unitary construction, e.g. formed of sheet laminae
    • 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
    • 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
    • C04B35/593—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 pressure sintering

Abstract

1470949 Silicon nitride gas turbine rotor FORD MOTOR CO Ltd 8 March 1976 [25 April 1975] 09121/76 Heading F1T [Also in Divisions B5 and C1] A silicon nitride rotor for a gas turbine engine having a hub of density greater than the blades is manufactured by making a blade ring 10 of silicon particles in a forming operation, nitriding the blade ring to convert it to substantially pure silicon nitride; coating all but a bonding surface 16 of the blade ring with a release agent, boron nitride specified, and then encapsulating all but the bonding surface of the blade ring with silicon nitride 18, 20 to form a die member; placing the die member in a pressing die structure 22 so that the bonding surface of the blade ring forms a portion of the surface of a die volume formed by the pressing die structure; filling the die volume with a mixture 42 of from 94 to 99.5 wt. per cent silicon nitride particles and from 6.0 to 0.5 wt. per cent of a densification aid, magnesium oxide specified; compacting the mixture under the simultaneous application of heat and pressure to at least 98% of theoretical density thereby forming the hub 44 bonded to the blade ring along the blade ring's bonding surface; and removing the pressed structure from the die and the encapsulant from the blade ring to obtain the complete rotor. The first element may be made by either a slip casting operation or by an injection moulding process.
GB912176A 1975-04-25 1976-03-08 Method of making a duo-density silicon nitride article Expired GB1470949A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US57189775A 1975-04-25 1975-04-25

Publications (1)

Publication Number Publication Date
GB1470949A true GB1470949A (en) 1977-04-21

Family

ID=24285500

Family Applications (1)

Application Number Title Priority Date Filing Date
GB912176A Expired GB1470949A (en) 1975-04-25 1976-03-08 Method of making a duo-density silicon nitride article

Country Status (4)

Country Link
JP (1) JPS51129899A (en)
CA (1) CA1079935A (en)
DE (1) DE2617336C2 (en)
GB (1) GB1470949A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005007326A2 (en) 2003-07-11 2005-01-27 Mtu Aero Engines Gmbh Method for making gas turbine elements and corresponding element

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4127684A (en) * 1977-12-23 1978-11-28 Ford Motor Company Crack protection method
DE3337025A1 (en) * 1983-10-12 1985-05-02 Feldmühle AG, 4000 Düsseldorf METHOD FOR PRODUCING A SILICON NITRIDE COMPONENT
SE456322B (en) * 1986-03-04 1988-09-26 Asea Stal Ab SET FOR MANUFACTURE OF METAL PRODUCTS THROUGH HEATISOSTAT COMPRESSION OF POWDER USING CORE

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB779474A (en) * 1954-07-29 1957-07-24 Union Carbide Ltd Method of preparing silicon nitride articles by slip casting
DE2135648A1 (en) * 1971-07-16 1973-01-25 Lucas Industries Ltd Silicon nitride - assembly of two blocks

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005007326A2 (en) 2003-07-11 2005-01-27 Mtu Aero Engines Gmbh Method for making gas turbine elements and corresponding element
WO2005007326A3 (en) * 2003-07-11 2005-06-16 Mtu Aero Engines Gmbh Method for making gas turbine elements and corresponding element

Also Published As

Publication number Publication date
DE2617336C2 (en) 1983-04-14
JPS51129899A (en) 1976-11-11
CA1079935A (en) 1980-06-24
DE2617336A1 (en) 1976-11-04

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee