CN1099680C - Filler for electrothermal elements - Google Patents
Filler for electrothermal elements Download PDFInfo
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- CN1099680C CN1099680C CN99117053A CN99117053A CN1099680C CN 1099680 C CN1099680 C CN 1099680C CN 99117053 A CN99117053 A CN 99117053A CN 99117053 A CN99117053 A CN 99117053A CN 1099680 C CN1099680 C CN 1099680C
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- filler
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- electrothermal elements
- caf
- tio
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention provides filler for electrothermal elements, which is characterized in that the main components of the filler are prepared according to different melting temperatures; after the main components are melted by an electroslag melting method, the main components are formed and remolded and are crushed and ground into powder. Because the filler for electrothermal elements of the present invention has favorable insulating property, the filler has the advantages of safety and stability, and can replace magnesite sand as the traditional filler, and the filler is favorable for the development of electric appliances which use the electrothermal elements.
Description
The present invention relates to a kind of inserts, particularly filler for electrothermal elements.
From electric heating element (more than 100 volts) research and development so far, the basic composition of electric heating element is by shell, heating wire, stem, separate material such as magnesia combine, and magnesia in the effect of electric 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 electric heating product or industrial instrumentation electric heating equipment, by international EIC standard or China's home electrical heater product requirement, first requirement is exactly to have stable fail safe, and even to this day, the electrothermal tube product is as very important in an electric heating appliance element, the performance index of its leading work electric heating appliance, and the inserts in the electrothermal tube---magnesia, because hot electrical strength instability, the hot variation of physical property is violent, the combination property that causes electrothermal tube: hot expansion is serious, hot insulation descends, hot withstand voltage decline, the timeliness electrical power descends, and the insulation of timeliness cold conditions descends the withstand voltage decline of timeliness cold conditions.Direct result: the heater element bombing, split the pipe phenomenon and often take place, safety factor 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 heater element again, thus at present at home, the heater element inserts that uses in the world main material---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 the key component fluorite (CaF of its mixing
2), aluminium powder (Al
2O
3), titanium dioxide (TiO
2), calcium oxide (CaO) fills a prescription by the different of smelting temperature with silica, its three kinds of prescriptions are: (by weight percentage)
Low form (≤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 silica needed before batch mixes through preliminary 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
Silica: at＞750 ℃ of baking ovens, constant temperature 0.2-0.5 hour
A little refines to the molten condition 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 inserts 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 inserts 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 silica is according to condition pretreated respectively, get key component CaF by middle warm type prescription
2595 grams, Al
2O
3325 grams, TiO
240 grams, SiO
217 grams, CaO4 gram and accessory constituent total 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, energized, look current current/voltage value control speed governing assembly and make it fusing, when being in molten condition 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 condition into grooving, for accelerating cooling rate, grooving should be designed to axial symmetrical water-cooled cube, the fully cooling back demoulding, cooled bar fragmentation is after grinder 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, hydroscopicity is than being 30-33%, corrosivity is zero, and cold conditions insulate than being 1.22～1.36 times, and hot linear 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 inserts magnesia, help using the development of the electrical equipment of electric heating element.
Claims (5)
1, a kind of filler for electrothermal elements is characterized in that the key component fluorite CaF of its mixing
2, aluminium powder Al
2O
3, titanium dioxide TiO
2, calcium oxide CaO fills a prescription by the different of smelting temperature with silica, three kinds of prescriptions by weight percentage are:
≤ 600 ℃ low form: 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
≤ 840 ℃ middle warm type: 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
≤ 1200 ℃ high temperature modification: 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 silica needed before batch mixes through preliminary 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
Silica: at＞750 ℃ of baking ovens, constant temperature 0.2-0.5 hour
A little refines to the molten condition 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 inserts 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 the low-pressure type of the high-pressure type of 10KV or 6600V, once-through type and 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 inserts 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 CN1262300A (en) | 2000-08-09 |
| CN1099680C true 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) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068236A (en) * | 1991-06-22 | 1993-01-20 | 西安交通大学 | Temperature automatically controlled heating cable |
| CN2188838Y (en) * | 1994-03-26 | 1995-02-01 | 于欣海 | Anti-burning electric heating hose |
| EP0641845A1 (en) * | 1993-09-03 | 1995-03-08 | Les Peintures Techniques Renaudin | Fluid or pasty conductive material |
-
1999
- 1999-08-31 CN CN99117053A patent/CN1099680C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068236A (en) * | 1991-06-22 | 1993-01-20 | 西安交通大学 | Temperature automatically controlled heating cable |
| EP0641845A1 (en) * | 1993-09-03 | 1995-03-08 | Les Peintures Techniques Renaudin | Fluid or pasty conductive material |
| CN2188838Y (en) * | 1994-03-26 | 1995-02-01 | 于欣海 | Anti-burning electric heating hose |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1262300A (en) | 2000-08-09 |
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|---|---|---|---|
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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 |