US4722762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making shaped bodies of silicon carbide or of graphite or graphite-like material with a silicon carbide surface
Assignee: Forschungszentrum Jülich
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Filing: 1983-11-16
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Granted: 1988-02-02
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Expires: 2003-11-16
Abstract
Abstract A method of making shaped bodies of silicon carbide, of graphite coated with silicon carbide or of a graphite-like material with a silicon carbide surface wherein a graphitic body is assembled from preformed parts in the desired shape and is immersed, under a chemically inert atmosphere, in a silicon melt and after penetration of the melt into gaps between abutting surfaces of the body and after reaction of the silicon with the graphite or the graphite-like material to form silicon carbide at the junctions, the body is removed from the melt and is cooled in a chemically inert atmosphere.
Inventors
- 👤 Hartmut Luhleich
- 👤 Francisco Dias
- 👤 Ashok K. Gupta
- 👤 Erno Gyarmati
- 👤 Marian Kampel
- 👤 Rudolf Munzer
- 👤 Aristides Naoumidis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:39
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/001; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; C04B37/003; C04B37/005; F; F28; F28F; F28F21/00; F28F21/02; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/08; C04B2237/083; C04B2237/16; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/363; C04B2237/365; C04B2237/50; C04B2237/60; C04B2237/61; C04B2237/76; C04B2237/80; C04B2237/86; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31536
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
A method of producing a silicon carbide body having homogeneously interconnected parts, comprising the steps of: (a) forming an assembly of shaped carbon parts such that junctions are formed between abutting surfaces of said parts, said parts having a density of 0.6 to 1.3 g/cm 3 , a porosity of 30 to 70% and an air permeability of 1 to 8 cm 3 /min.; (b) immersing said assembly in liquid silicon under a chemically inert atmosphere for a period sufficient at least to enable penetration of liquid silicon into each of said parts throughout the thickness thereof and into said junction and for a period sufficient at least to enable reaction between the penetrating silicon and the carbon of said carbon parts to form a homogeneous silicon carbide structure at each of said junctions and through said parts; (c) removing said assembly following step (b) from said liquid silicon; and (d) cooling the assembly removed from the liquid silicon under an inert atmosphere.
Claim 2
Independent Claim
163 words
A method of producing a silicon carbide body having homogeneously interconnected parts, comprising the steps of: (a) forming an assembly of shaped carbon parts such that junctions are formed between abutting surfaces of said parts, said parts having a density of 0.6 to 1.3 g/cm 3 , a porosity of 30 to 70% and an air permeability of 1 to 8 cm 3 /min.; (b) immersing said assembly in liquid silicon under a chemically inert atmosphere for a period sufficient at least to enable penetration of liquid silicon into each of said parts throughout the thickness thereof and into said junction and for a period sufficient at least to enable reaction between the penetrating silicon and the carbon of said carbon parts to form a homogeneous silicon carbide structure at each of said junctions and through said parts; (c) removing said assembly following step (b) from said liquid silicon; and (d) cooling the assembly removed from the liquid silicon under an inert atmosphere.
Claim 3
Independent Claim
205 words
A method of producing a silicon carbide body having homogeneously interconnected parts, comprising the steps of: (a) forming an assembly of shaped carbon parts such that junctions are formed between abutting surfaces of said parts, and parts having a density of 0.6 to 1.3 g/cm 3 , a porosity of 30 to 70% and an air permeability of 1 to 8 cm 3 /min.; (b) immersing said assembly in liquid silicon under a chemically inert atmosphere for a period sufficient at least to enable penetration of liquid silicon into each of said parts throughout the thickness thereof and into said junction and for a period sufficient at least to enable reaction between the penetrating silicon and the carbon of said graphite parts to form a homogeneous silicon carbide structure at each of said junctions and through said parts; (c) removing said assembly following step (b) from said liquid silicon; (d) cooling the assembly removed from the liquid silicon under an inert atmosphere; and (e) removing excess silicon from said assembly prior to the cooling thereof by heating said assembly following step (c) to a temperature of at most 2000° C. and sufficient to vaporize adherent adherent elemental silicon in vacuum or in an inert atmosphere.
Claim 4
Independent Claim
205 words
A method of producing a silicon carbide body having homogeneously interconnected parts, comprising the steps of: (a) forming an assembly of shaped carbon parts such that junctions are formed between abutting surfaces of said parts, and parts having a density of 0.6 to 1.3 g/cm 3 , a porosity of 30 to 70% and an air permeability of 1 to 8 cm 3 /min.; (b) immersing said assembly in liquid silicon under a chemically inert atmosphere for a period sufficient at least to enable penetration of liquid silicon into each of said parts throughout the thickness thereof and into said junction and for a period sufficient at least to enable reaction between the penetrating silicon and the carbon of said graphite parts to form a homogeneous silicon carbide structure at each of said junctions and through said parts; (c) removing said assembly following step (b) from said liquid silicon; (d) cooling the assembly removed from the liquid silicon under an inert atmosphere; and (e) removing excess silicon from said assembly prior to the cooling thereof by heating said assembly following step (c) to a temperature of at most 2000° C. and sufficient to vaporize adherent adherent elemental silicon in vacuum or in an inert atmosphere.
Claim 5
Independent Claim
187 words
A method of producing a silicon carbide body having homogeneously interconnected parts, comprising the steps of: (a) forming an assembly of shaped carbon parts such that junctions are formed between abutting surfaces of said parts, said parts having a density of 0.6 to 1.3 g/cm 3 , a porosity of 30 to 70% and an air permeability of 1 to 8 cm 3 /min.; (b) immersing said assembly in liquid silicon under a chemically inert atmosphere for a period sufficient at least to enable pernetration of liquid silicon into each of said parts throughout the thickness thereof and into said junction and for a period sufficient at least to enable reaction between the penetrating silicon and the carbon of said carbon parts to form a homogeneous silicon carbide structure at each of said junctions and through said parts; (c) removing said assembly following step (b) from said liquid silicon; (d) cooling the assembly removed from the liquid silicon under an inert atmosphere; and (e) eliminating excess silicon adherent to said assembly by immersing said assembly following step (d) in a solution in which elemental silicon is soluble.
Claim 6
Independent Claim
187 words
A method of producing a silicon carbide body having homogeneously interconnected parts, comprising the steps of: (a) forming an assembly of shaped carbon parts such that junctions are formed between abutting surfaces of said parts, said parts having a density of 0.6 to 1.3 g/cm 3 , a porosity of 30 to 70% and an air permeability of 1 to 8 cm 3 /min.; (b) immersing said assembly in liquid silicon under a chemically inert atmosphere for a period sufficient at least to enable pernetration of liquid silicon into each of said parts throughout the thickness thereof and into said junction and for a period sufficient at least to enable reaction between the penetrating silicon and the carbon of said carbon parts to form a homogeneous silicon carbide structure at each of said junctions and through said parts; (c) removing said assembly following step (b) from said liquid silicon; (d) cooling the assembly removed from the liquid silicon under an inert atmosphere; and (e) eliminating excess silicon adherent to said assembly by immersing said assembly following step (d) in a solution in which elemental silicon is soluble.
Claim 7
Dependent Claim
24 words
The method defined in claim 1, claim 2 or claim 3 wherein said parts have a density of 0.8 to 1.2 c/cm 3 .
Claim 8
Dependent Claim
55 words
The method defined in claims 1, 2 or claim 3 wherein said parts are formed by the steps of: (a 1 ) coating carbonaceous particles with a binder; (a 2 ) shaping the binder-coated carbonaceous particles to the shape of one of said carbon parts; and (a 3 ) coking the shaped particles and binder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |