CN1262300A - Filler for electrothermal elements - Google Patents
Filler for electrothermal elements Download PDFInfo
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- CN1262300A CN1262300A CN 99117053 CN99117053A CN1262300A CN 1262300 A CN1262300 A CN 1262300A CN 99117053 CN99117053 CN 99117053 CN 99117053 A CN99117053 A CN 99117053A CN 1262300 A CN1262300 A CN 1262300A
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- filler
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- caf
- tio
- cao
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Abstract
A filler for electrothermal elements features that its components are chosen according to smelting temp. It is prepared through electroslag smelting, shaping, demoulding, crushing and grinding into powder. Its advantages are high electric insulation, safety and stability.
Description
The present invention relates to a kind of stopping composition, particularly filler for electrothermal elements.
From electrical heating element (more than 100 volts) research and development so far, the essentially consist of electrical heating element is by shell, heating wire, stem, separate material such as magnesia combine, and magnesia in the effect of electrical heating element is: the heat that the heating wire energising is produced conducts to shell through intermediate magnesia, shell distributes heat energy to medium, magnesia is as an intermediate, it is except that playing the heat conduction function, to will insulate between heating wire and the shell, no matter family expenses electrically heated product or industrial instrumentation electrical heating device, by international EIC standard or China's home electrical heater product requirement, first requirement is exactly to have stable security, and even to this day, the electrothermal tube product is as very important in an electric heating apparatus element, the performance index of its leading work electric heating apparatus, and the stopping composition in the electrothermal tube---magnesia, because hot electrical strength instability, the hot variation of physicals is violent, the over-all properties that causes electrothermal tube: hot expansion is serious, hot insulation descends, hot withstand voltage decline, the timeliness electric power descends, and the insulation of timeliness cold conditions descends the withstand voltage decline of timeliness cold conditions.Direct result: the Heating element bombing, split the pipe phenomenon and often take place, safety factors descends; It is bad that hot electric property becomes, and causes leaky to take place, and is again a unsafe factor; Timeliness descends and causes that electrothermal efficiency is low; The timeliness electric property descends and to cause the inefficacy of Heating element again, thus at present at home, the Heating element stopping composition that uses in the world main raw---magnesia has not satisfied the Modern Industry Products performance demands.
Purpose of the present invention is intended to overcome the deficiencies in the prior art and a kind of good insulation preformance, the filler for electrothermal elements of safety and stability is provided.
The object of the present invention is achieved like this:
A kind of filler for electrothermal elements is characterized in that its blended main ingredient fluorite (CaF
2), aluminium powder (Al
2O
3), titanium dioxide (TiO
2), calcium oxide (CaO) fills a prescription by the different of smelting temperature with silicon oxide, its three kinds of prescriptions are: (by weight percentage)
Low temperature modification (≤600 ℃) CaF
2: Al
2O
3: TiO
2: SiO
2: CaO=(63-65): (28-30): (2.6-2.8): (1.8-2.0): (0.1-0.2)
Middle warm type (≤840 ℃) CaF
2: Al
2O
3: TiO
2: SiO
2: CaO=(57-60): (31-33.5): (3.8-4.2): (1.6-1.8): (0.1-0.5)
High temperature modification (≤1200 ℃) CaF
2: Al
2O
3: TiO
2: SiO
2: CaO=(51-54): (37-39.5): (4.2-4.5): (1.3-1.5): (0.1-0.5)
Wherein, fluorite, aluminium powder and silicon oxide needed before batch mixes through pre-treatment:
Fluorite: be crushed to about 10 orders ℃ constant temperature 0.5-1 hour more earlier through baking oven＞600
Aluminium powder: at＞750 ℃ of baking ovens, constant temperature 0.2-0.3 hour
Silicon oxide: at＞750 ℃ of baking ovens, constant temperature 0.2-0.5 hour
A little refines to the molten state that produces arc light with electroslag melting process with compound earlier, progressively drop into compound, repeatedly circulation adds to 75% o'clock of furnace capacity and stops to smelt, pour the material of molten state into grooving, the fully cooling back demoulding becomes the bar crushing grinding behind the demoulding 40-120 purpose powder shape to be stopping composition of the present invention again.
---described electroslag smelting can be and be loaded with polar form, had a year no polar form, nothing is loaded with polar form, no-load does not have polar form, lining type and crystal type are arranged.
---the power supply of described electroslag smelting can be high-pressure type (10KV or 6600V), once-through type and low-pressure type (420-430V).
---the furnace run of described electroslag smelting can be continuous casting type and converter type.
---the accessory constituent of described stopping composition comprises ZrO, MgO and the magnesium zirconate mixture of trace.
The invention will be further described below by embodiment:
During enforcement, earlier that fluorite, aluminium powder and silicon oxide is according to condition pretreated respectively, get main ingredient CaF by middle warm type prescription
2595 grams, Al
2O
3325 grams, TiO
240 grams, SiO
217 grams, CaO4 gram and accessory constituent gross weight are 1 kilogram and enter the melting program after mixing, in crucible, put into the compound that a little prepares, insert electrode through the F.F. mechanism action, when electrode contacts with compound, connect power supply, look current current/voltage value control speed governing assembly and make it fusing, when being in molten state fully, mixture in the crucible furnace (is advisable) according to producing arc light, progressively drop into compound, repeatedly circulation reaches at 75% o'clock to the crucible furnace melt and stops to smelt, move through switching mechanism, pour the material of molten state into grooving, for accelerating speed of cooling, grooving should be designed to axial symmetrical water-cooled cubes, the fully cooling back demoulding, cooled bar fragmentation is after shredder grinds to form powder, and the abrasive grains diameter is 40～120 orders, is filler for electrothermal elements of the present invention.
Filler for electrothermal elements proportion ratio of the present invention is 1.02～1.08 times (natural packing ratios), cold conditions is withstand voltage, and ratio is 1.31～1.38 times, color is grey/cream colour, rate of moisture absorption is than being 30-33%, corrodibility is zero, and cold conditions insulate than being 1.22～1.36 times, and hot polar expansion ratio is 0.15～0.2, the heat conduction amount ratio is 1.39～1.41 times, and toxicity is zero.
Filler for electrothermal elements good insulation preformance of the present invention, safety and stability will substitute traditional stopping composition magnesia, help using the development of the electrical equipment of electrical heating element.
Claims (5)
1, a kind of filler for electrothermal elements is characterized in that its blended main ingredient fluorite (CaF
2), aluminium powder (Al
2O
3), titanium dioxide (TiO
2), calcium oxide (CaO) fills a prescription by the different of smelting temperature with silicon oxide, its three kinds of prescriptions are: (by weight percentage)
Low temperature modification (≤600 ℃) CaF
2: Al
2O
3: TiO
2: SiO
2: CaO=(63-65): (28-30): (2.6-2.8): (1.8-2.0): (0.1-0.2)
Middle warm type (≤840 ℃) CaF
2: Al
2O
3: TiO
2: SiO
2: CaO=(57-60): (31-33.5): (3.8-4.2): (1.6-1.8): (0.1-0.5)
High temperature modification (≤1200 ℃) CaF
2: Al
2O
3: TiO
2: SiO
2: CaO=(51-54): (37-39.5): (4.2-4.5): (1.3-15): (0.1-0.5)
Wherein, fluorite, aluminium powder and silicon oxide needed before batch mixes through pre-treatment:
Fluorite: be crushed to about 10 orders ℃ constant temperature 0.5-1 hour more earlier through baking oven＞600
Aluminium powder: at＞750 ℃ of baking ovens, constant temperature 0.2-0.3 hour
Silicon oxide: at＞750 ℃ of baking ovens, constant temperature 0.2-0.5 hour
A little refines to the molten state that produces arc light with electroslag melting process with compound earlier, progressively drop into compound, repeatedly circulation adds to 75% o'clock of furnace capacity and stops to smelt, pour the material of molten state into grooving, the fully cooling back demoulding becomes the bar crushing grinding behind the demoulding 40-120 purpose powder shape to be stopping composition of the present invention again.
2, filler for electrothermal elements according to claim 1, it is characterized in that electroslag smelting can be loaded with polar form, have carry a no polar form, nothing is loaded with polar form, no-load does not have polar form, lining type and crystal type are arranged.
3, filler for electrothermal elements according to claim 1 is characterized in that the power supply of electroslag smelting can be high-pressure type (10KV or 6600V), once-through type and low-pressure type (420-430V).
4, filler for electrothermal elements according to claim 1 is characterized in that the furnace run of electroslag smelting can be continuous casting type and converter type.
5, filler for electrothermal elements according to claim 1 is characterized in that the accessory constituent of stopping composition comprises micro-ZrO, MgO and magnesium zirconate mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99117053A CN1099680C (en) | 1999-08-31 | 1999-08-31 | Filler for electrothermal elements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99117053A CN1099680C (en) | 1999-08-31 | 1999-08-31 | Filler for electrothermal elements |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1262300A true CN1262300A (en) | 2000-08-09 |
| CN1099680C CN1099680C (en) | 2003-01-22 |
Family
ID=5279700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99117053A Expired - Fee Related CN1099680C (en) | 1999-08-31 | 1999-08-31 | Filler for electrothermal elements |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1099680C (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1022213C (en) * | 1991-06-22 | 1993-09-22 | 西安交通大学 | Automatic temp. controlling heating cable |
| FR2709589B1 (en) * | 1993-09-03 | 1996-08-14 | Renaudin Peintures Tech | Electrically conductive fluid or pasty material. |
| CN2188838Y (en) * | 1994-03-26 | 1995-02-01 | 于欣海 | Anti-burning electric heating hose |
-
1999
- 1999-08-31 CN CN99117053A patent/CN1099680C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1099680C (en) | 2003-01-22 |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |