EP0115745A1
Expired / Lapsed
EP
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Refractory metal borides, carbides and nitrides, and composites containing them
Assignee: Moltech Invent SA
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Filing: 1983-12-23
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Granted: —
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Expires: 2003-12-23
Abstract
Abstract Refractory metal borides, carbides, nitrides and mixtures thereof of the Group IVb, Vb and Vlb metals are produced from a glass or microcrystalline gel formed from organo-metallic precursors. Typically Ti0<sub>2</sub>.<sub>B203</sub> glass is produced by hydrolysis of titanium butoxide and trimethyl borate, followed by gelling/ drying. The glass may have carbon inclusions or may be mixed with carbon or aluminum powder or a mixture thereof, and reacted. In the case of aluminothermic and carboaluminother- mic reduction, there is a residual aluminum-containing phase in the product. Composites can also be produced by including inert materials in the reaction mixture.
Inventors
- 👤 Ajit Yeshwant Sane
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 06:45
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/5607; C04B35/5611; C01; C01B; C01B21/00; C01B21/06; C01B32/00; C01B32/90; C01B35/00; C01B35/02; C01B35/04; C04B35/58; C04B35/58007; C04B35/58014; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/622; C04B35/64; C04B35/65; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C01B21/0615; C01B21/0617; C01B21/062; C01B21/076; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
79 words
A method of producing a Group IVb, Vb or VIb metal boride, carbide, nitride or mixtures thereof by chemical reaction of an oxide of the Group IVb, Vb or VIb metal with an appropriate reagent or reagents, characterized in that the Group IVb, VB or VIb metal oxide(s) used in the reaction is a glass or microcrystalline gel having a grain size up to 200 A, produced by hydrolysis of an organic solution of the metal followed by drying/gelling.
Claim 2
Independent Claim
79 words
A method of producing a Group IVb, Vb or VIb metal boride, carbide, nitride or mixtures thereof by chemical reaction of an oxide of the Group IVb, Vb or VIb metal with an appropriate reagent or reagents, characterized in that the Group IVb, VB or VIb metal oxide(s) used in the reaction is a glass or microcrystalline gel having a grain size up to 200 A, produced by hydrolysis of an organic solution of the metal followed by drying/gelling.
Claim 3
Dependent Claim
52 words
The method of claim 1, in which a carbide, nitride or a mixture of carbide and nitride of the Group IVb, Vb or VIb metal(s) is produced by intimately mixing carbon or a carbon precursor in the glass or gel and carrying out the reaction under vacuum, an inert atmosphere or nitrogen.
Claim 4
Dependent Claim
70 words
The method of claim 1, in which a boride or a mixture of boride with carbide and/or nitride of the Group IVb, Vb or VIb metal(s) is produced from a glass or microcrystalline gel formed of the Group IVb, Vb or VIb metal oxide and boron oxide, produced by coprecipitation of the oxides from a solution of organic compounds of the metal and of boron by hydrolysis followed by drying/gelling.
Claim 5
Dependent Claim
27 words
The method of claim 3, in which the glass or gel contains the metal oxide and boron oxide in the exact molar ratio to form the boride.
Claim 6
Dependent Claim
22 words
The method of claim 3 or 4, in which carbon or a carbon precursor is intimately mixed in the glass or gel.
Claim 7
Dependent Claim
44 words
The method of claim 5, in which boride of the Group IVb, Vb or VIb metal is formed as a powder or as a friable body which is ground to a powder, and the boride powder is then compacted and sintered into a body.
Claim 8
Dependent Claim
30 words
The method of claim 5, in which boride of the Group IVb, Vb or VIb metal is formed as a self-sustaining porous body by controlled heating of the reaction mixture.
Claim 9
Dependent Claim
39 words
The method of claim 5, in which a composite is formed between the boride of the Group IVb, Vb or VIb metal and an inert material included in the reaction mixture or to which the reaction mixture is applied.
Claim 10
Dependent Claim
52 words
The method of claim 3 or 4, in which a composite material of a boride or a mixture of boride with carbide and/or nitride of the Group IVb, Vb or VIb metal(s) and an aluminum-containing phase is produced by reacting the glass or gel with aluminum, an aluminum compound or mixtures thereof.
Claim 11
Dependent Claim
36 words
The method of claim 9, in which finely divided powder of aluminum or aluminum mixed with aluminum nitride is mixed in the glass or gel or is mixed with a powder of the glass or gel.
Claim 12
Dependent Claim
19 words
The method of claim 10, in which the aluminum is substantially fully converted to aluminum oxide, nitride and/or oxynitride.
Claim 13
Dependent Claim
18 words
The method of claim 10, in which there is excess unreacted aluminum at the end of the reaction.
Claim 14
Dependent Claim
19 words
The method of claim 12, in which the excess aluminum is subsequently reacted with nitrogen to form aluminum nitride.
Claim 15
Independent Claim
51 words
The method of any one of claims 9 to 13, in which the amount of the Group IVb, Vb or VIb metal boride and/or of the aluminum-containing phase in the composite material is adjusted by including a quantity of the boride and/or of an aluminum compound in the starting reaction mixture.
Claim 16
Independent Claim
18 words
The method of any one of claims 9 to 14, in which the reaction mixture further comprises carbon.
Claim 17
Dependent Claim
16 words
The method of claim 9 or 15, in which the reaction mixture further comprises aluminum nitride.
Claim 18
Independent Claim
26 words
The method of any one of claims 9 to 16, in which the composite material is formed as or is compacted into a porous self-sustaining body.
Claim 19
Dependent Claim
52 words
A method of producing a body of a composite material of a Group IVb, Vb or VIb metal boride, an aluminum compound and aluminum, characterized by producing a porous composite body of the boride and the aluminum compound by the method of claim 9 and infiltrating the porous body with molten aluminum.
Claim 20
Dependent Claim
63 words
A component of an electrolytic aluminum production cell which in use is normally contacted with molten aluminum and/or cryolite or which may accidentally be contacted with molten aluminum and/or cryolite, characterized in that it has a surface and/or an inner portion containing a Group IVb, Vb or VIb metal boride, nitride, carbide or mixtures thereof produced by the method of any preceding claim.
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