GB393283A - Improvements in or relating to non-metallic resistors and methods of making them - Google Patents
Improvements in or relating to non-metallic resistors and methods of making themInfo
- Publication number
- GB393283A GB393283A GB33139/31A GB3313931A GB393283A GB 393283 A GB393283 A GB 393283A GB 33139/31 A GB33139/31 A GB 33139/31A GB 3313931 A GB3313931 A GB 3313931A GB 393283 A GB393283 A GB 393283A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silicon carbide
- resistors
- carbon
- per cent
- acid
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 abstract 6
- 229910010271 silicon carbide Inorganic materials 0.000 abstract 5
- 229910052799 carbon Inorganic materials 0.000 abstract 4
- 239000004115 Sodium Silicate Substances 0.000 abstract 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract 3
- 239000002253 acid Substances 0.000 abstract 3
- 239000003513 alkali Substances 0.000 abstract 3
- 239000000377 silicon dioxide Substances 0.000 abstract 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 abstract 3
- 229910052911 sodium silicate Inorganic materials 0.000 abstract 3
- 239000011230 binding agent Substances 0.000 abstract 2
- 229910002804 graphite Inorganic materials 0.000 abstract 2
- 239000010439 graphite Substances 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 1
- 230000001427 coherent effect Effects 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 239000006233 lamp black Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 238000000746 purification Methods 0.000 abstract 1
- 238000001953 recrystallisation Methods 0.000 abstract 1
- 239000004576 sand Substances 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000002002 slurry Substances 0.000 abstract 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
- 238000009834 vaporization Methods 0.000 abstract 1
- 230000008016 vaporization Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- 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
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
- H01C7/022—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient mainly consisting of non-metallic substances
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/148—Silicon, e.g. silicon carbide, magnesium silicide, heating transistors or diodes
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Ceramic Products (AREA)
- Apparatuses And Processes For Manufacturing Resistors (AREA)
- Non-Adjustable Resistors (AREA)
Abstract
<PICT:0393283/III/1> A silicon carbide resistor is made of grains having a silicon carbide content of 99 per cent or greater. In order to purify the grain, crude lump silicon carbide is crushed and treated with an acid, such as sulphuric acid, to remove surface impurities. For further purification, the grain may be treated with a solution of sodium hydroxide or other alkali. In an example, 32,5 per cent of 120-mesh silicon carbide, acid and alkali washed, is mixed with 65 per cent of 280-mesh silicon carbide powder, acid and alkali washed, and 2,5 per cent of lamp-black. The grain is mixed with a temporary binder such as sodium silicate, moulded, and given a preliminary baking at 600 DEG C. The resistors are then removed from the mould and dipped in a slip or slurry containing fine sand, carbon, and water. The coated resistors 4 are placed in a furnace consisting of a refractory bottom 1 covered to a depth of about two inches with a mixture 3 of fine silica and carbon in the proportion of three parts of silica to one part of carbon. The resistors 4 are placed end to end between electrodes 2, and joined by means of graphite blocks 5 and a paste of graphite, silicon, and sodium silicate. The resistors are then covered with a further layer of silica and carbon mixture and current is passed between the electrodes 2, a temperature of about 2000 DEG C. or 2200 DEG C. being attained. The sodium silicate employed as a temporary binder is decomposed, and vaporization of the silicon carbide takes place, causing recrystallization which binds the particles together into a strong coherent mass.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US501020A US1914939A (en) | 1930-12-09 | 1930-12-09 | Nonmetallic resistor and method of making the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB393283A true GB393283A (en) | 1933-05-30 |
Family
ID=23991823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33139/31A Expired GB393283A (en) | 1930-12-09 | 1931-11-30 | Improvements in or relating to non-metallic resistors and methods of making them |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1914939A (en) |
| DE (1) | DE619504C (en) |
| GB (1) | GB393283A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE764658C (en) * | 1940-06-13 | 1953-02-09 | Hartmetallwerkzeugfabrik Meuts | Heating wire resistant to corrosion in the air in the heat |
| US2529144A (en) * | 1945-03-29 | 1950-11-07 | Gen Electric | Resistance material |
| US2470153A (en) * | 1945-05-25 | 1949-05-17 | Control Instr Co Inc | Resistor and method of making same |
| US2913695A (en) * | 1955-07-11 | 1959-11-17 | Kanthal Ab | Electric resistance heating elements |
-
1930
- 1930-12-09 US US501020A patent/US1914939A/en not_active Expired - Lifetime
-
1931
- 1931-10-21 DE DEG80911D patent/DE619504C/en not_active Expired
- 1931-11-30 GB GB33139/31A patent/GB393283A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US1914939A (en) | 1933-06-20 |
| DE619504C (en) | 1935-10-02 |
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