GB396088A - Improvements in or relating to the manufacture of silicon carbide bodies - Google Patents
Improvements in or relating to the manufacture of silicon carbide bodiesInfo
- Publication number
- GB396088A GB396088A GB130332A GB130332A GB396088A GB 396088 A GB396088 A GB 396088A GB 130332 A GB130332 A GB 130332A GB 130332 A GB130332 A GB 130332A GB 396088 A GB396088 A GB 396088A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rod
- crucible
- silicon
- heated
- junction
- 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
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
- C04B35/56—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 carbides or oxycarbides
- C04B35/565—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 carbides or oxycarbides based on silicon carbide
- C04B35/573—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 carbides or oxycarbides based on silicon carbide obtained by reaction sintering or recrystallisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Resistance Heating (AREA)
- Apparatuses And Processes For Manufacturing Resistors (AREA)
Abstract
<PICT:0396088/III/1> In order to increase the conductivity of the terminal portions of a silicon carbide resistor to facilitate making contact therewith, these portions are impregnated with silicon or a metal. A crucible 2, preferably a carbon block, is adapted to be heated almost instantaneously to a very high temperature by passing a heavy current therethrough. The electrodes 3 between which the block 2 is placed may be of graphite so that they are of lower resistance than the block. The end of the silicon carbide rod 4 is positioned in the crucible, the rod preferably being preheated, and its end is surrounded with a predetermined quantity of silicon, silicon alloy, or other impregnating material such as aluminium, nickel, iron, cobalt, chromium, or mixtures of two or more of these metals in the solid state. The temperature is raised very rapidly, the silicon being absorbed into the rod almost simultaneously and the excess metal being removed from the crucible by vaporization. The crucible and the end of the rod are still further heated for a short interval, e.g. from 5 to 30 seconds to about 2500 DEG to 2,800 DEG C. in order to produce a further decrease of resistance of the impregnated portion of the rod. The entire heating period may be from one to five minutes and should not greatly exceed ten minutes. The rapid heating may alternatively be effected by inserting a removable crucible into a previously-heated high temperature furnace, or high-frequency induction may be employed. From 2 to 20 per cent of aluminium may be added to the silicon to increase the strength of the junction between the rod and the impregnated end. The strength of this junction may be increased by using a deep crucible so that the rod becomes heated for some considerable distance. The impregnating material then rises to a greater height in the central part of the rod than near the outer surface, giving a conical junction between the treated and untreated part of the rod. Specification 239,216, [Class 37, Electricity, Measuring &c.], is referred to. Reference has been directed by the Comptroller to Specification 365,081 (as open to inspection under Sect. 91 of the Acts), [Group XXXVI].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB130332A GB396088A (en) | 1932-01-15 | 1932-01-15 | Improvements in or relating to the manufacture of silicon carbide bodies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB130332A GB396088A (en) | 1932-01-15 | 1932-01-15 | Improvements in or relating to the manufacture of silicon carbide bodies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB396088A true GB396088A (en) | 1933-07-17 |
Family
ID=9719633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB130332A Expired GB396088A (en) | 1932-01-15 | 1932-01-15 | Improvements in or relating to the manufacture of silicon carbide bodies |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB396088A (en) |
-
1932
- 1932-01-15 GB GB130332A patent/GB396088A/en not_active Expired
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