CN1480429A - Face coated carborundum heating unit - Google Patents
Face coated carborundum heating unit Download PDFInfo
- Publication number
- CN1480429A CN1480429A CNA021368341A CN02136834A CN1480429A CN 1480429 A CN1480429 A CN 1480429A CN A021368341 A CNA021368341 A CN A021368341A CN 02136834 A CN02136834 A CN 02136834A CN 1480429 A CN1480429 A CN 1480429A
- Authority
- CN
- China
- Prior art keywords
- silicon carbide
- silicon
- carbide heater
- coating
- top coat
- 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.)
- Granted
Links
Landscapes
- Resistance Heating (AREA)
Abstract
A heat-generating silicon carbide body with coated surface layer features that the surface of original heat-generating silicon carbide body, which can be easily corroded by corrosive gas, is coated by the mixture of silicon nitride and SiO2 to increase its anticorrosion power.
Description
Technical field
The present invention relates to a kind of silicon carbide heater of top coat, relate in particular to and a kind ofly can improve its silicon carbide heater of the top coat in the work-ing life in the nitrogen atmosphere particularly in corrosive environment.
Background technology
The silicon carbide heater that uses in industrial furnace claims globars again, but its surface coating.Usually silicon carbide heater is all by the recrystallize manufactured.And additives such as adding sintering bonding agent can be avoided sneaking into of impurity, so can produce the purity height, have the heating element of stable physical property such as the low resistance opering characteristic of electric apparatus, and are used widely.
The re-crystallized silicon carbide heating element is to add that by carborundum powder the organic bond mixing moulding impels the combination of silicon carbide whisker intergranular afterwards through the high temperature recrystallize more than 2100 degrees centigrade, form new tissue.Crystal grain and the intercrystalline junction of containing silicon carbide in this neoblastic structure, the size of this junction, how much its physical strength and the opering characteristic of electric apparatus not being exerted an influence of quantity, but influence its chemical weather resistance, that is to say to have considerable dominating role in work-ing life for heating element.Because the junction of this silicon carbide whisker intergranular for other position erosion resistance a little less than, when being corroded property of heating element gas corrodes, this junction will at first suffer erosion and deterioration, thus the long-term stability that influences this heating element is used.If silicon carbide heater is placed nitrogen atmosphere, when using under the high temperature more than 1400 degrees centigrade, silicon carbide will react and generate silicon nitride, thereby the surface of silicon carbide heater is decomposed, and impedance increases and shortened its work-ing life greatly.
Summary of the invention
The objective of the invention is to propose a kind of silicon carbide heater of top coat, by covering the coating of the mixture that one deck is made up of silicon nitride and silicon-dioxide on the surface of this heating element, improve its work-ing life in nitrogen environment, thereby be provided at the silicon carbide heater of same stable top coat in work-ing life in the nitrogen environment.
The present invention is achieved in that
A kind of silicon carbide heater of top coat comprises the coating on silicon carbide heater and surface thereof, and this top coat is that the silicon nitride of 80%-95% and silicon-dioxide that weight percent is 20%-5% are formed by weight percent.After this silicon nitride and colloidal silica etc. mix, pulverize and stir, be sprayed on formed muddy mixture on the heating portion surface of described silicon carbide heater with gunite, after treating this silicon carbide heater complete drying, it is energized to surface temperature reaches after 1350 several years and in air, kept about 5 minutes, make it coating is sintered in heating portion surface by self heating.
The present invention can keep less impedance increment rate under long conduction time, can long-term stability use under special corrosive environment, has brought very big benefit to industrial sector.
Embodiment
The present invention is described in further detail below in conjunction with embodiment.
When independent coating silicon nitride, can not guarantee all pores are covered, increased silicon-dioxide so the present invention is directed to this point filling remaining pore, thereby all pores can both coatedly be sealed.And increased bonding strength because the existence of silicon-dioxide makes between silicon carbide heater itself and coated material, improved molten putting forth effort, can avoid peeling off phenomenon fully, thereby produced the silicon carbide heater of band coating with work-ing life steady in a long-term.
At the silicon nitride powder below 50 microns 270 gram, the mixed machine that stirs that molten silicon 150 grams that are about 30 grams with the silicon-dioxide solid content are put into porcelain system carries out about one hour pulverizing and stirring with granularity in the present invention.It is 20 millimeters that formed slimy mixture is sprayed on external diameter with gunite, and 30 millimeters of heating ministers are on the heating portion surface of the silicon carbide heater that total length is 800 millimeters.After treating this silicon carbide heater complete drying, in air, kept about 5 minutes after it is energized to surface temperature and reaches 1350 degrees centigrade, make it coating is sintered in heating portion surface, thereby form the silicon carbide heater of top coat by self heating.This invention is by prolonging its work-ing life for the silicon carbide heater top coat, keep the technology in its common work-ing life when particularly using in corrosive atmospheres such as nitrogen atmosphere.
For carrying out the investigation of top coat effect, four coated silicon carbide heaters are installed in one wide 300 meters high 100 meters dark 200 meters the electric stove, and this electric stove is set to nitrogen environment, and (flow is 5 liters/minute; Dew point is-30 degrees centigrade, and temperature is set to 1450 degrees centigrade in the stove, and the heating element surface load is 6 watts/square centimeter, makes the heating element non-stop run.In order to compare, as shown in table 1, listed file names with the product that does not have coating with trial target identical conditions of the present invention; Only in the product of silicon nitride comprising coating and the coating dioxide-containing silica than Duoing the impedance increment rate of 30% product among the present invention with respect to the measured value of conduction time.
| Conduction time (hour) | ????300 | ????600 | ????900 | ??1200 |
| Impedance increment rate (%) | ||||
| The present invention | ????6 | ????6 | ????7 | ??8 |
| Thing coating product | ????30 | Fusing | ????- | ??- |
| Only by silicon nitride coating | ????10 | ????22 | ????29 | ??45 |
| Silicon nitride 70%, silicon-dioxide 30% coating | ????14 | ????32 | ????55 | ??- |
As seen, uncoated product has only just fused through 600 hours from chart; In the coating only the product of silicon nitride comprising and coated material ratio be silicon nitride 70%, the product of silicon-dioxide 30% is all with coating shedding, the trend that the impedance increment rate increases gradually.Experiment product of the present invention is compared with other example then to have stable coating and forms, even in that to reach under conduction time of 1200 hours its impedance increment rate still less.
Claims (2)
1, a kind of silicon carbide heater of top coat comprises the coating on silicon carbide heater and surface thereof it is characterized in that described top coat is that the silicon nitride of 80%-95% and silicon-dioxide that weight percent is 20%-5% are formed by weight percent.
2, the silicon carbide heater of a kind of top coat as claimed in claim 1, it is characterized in that, after described silicon nitride and silicon-dioxide etc. mix, pulverize and stir, be sprayed on formed muddy mixture on the heating portion surface of described silicon carbide heater with gunite, after treating this silicon carbide heater complete drying, it is energized to surface temperature reaches 1350 degree backs and in air, kept about 5 minutes, make it coating is sintered in heating portion surface by self heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02136834.1A CN1280238C (en) | 2002-09-05 | 2002-09-05 | Face coated carborundum heating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02136834.1A CN1280238C (en) | 2002-09-05 | 2002-09-05 | Face coated carborundum heating unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1480429A true CN1480429A (en) | 2004-03-10 |
| CN1280238C CN1280238C (en) | 2006-10-18 |
Family
ID=34146700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02136834.1A Expired - Lifetime CN1280238C (en) | 2002-09-05 | 2002-09-05 | Face coated carborundum heating unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1280238C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102491783A (en) * | 2011-11-21 | 2012-06-13 | 西北工业大学 | Repairing method of carbon ceramic brake-disc coating |
| CN102515846A (en) * | 2011-11-23 | 2012-06-27 | 陕西科技大学 | Preparation method of carbon/carbon (C/C) composite material zirconium silicate-silica-zirconium oxide self-healing external coating |
| CN102515851A (en) * | 2011-12-26 | 2012-06-27 | 天津大学 | Preparation method for silicon-nitride-based coating on surface of porous ceramic |
| CN107224813A (en) * | 2016-03-24 | 2017-10-03 | 日本碍子株式会社 | Amplifier case |
| CN108840686A (en) * | 2018-08-27 | 2018-11-20 | 淄博德瑞兹电热元件有限公司 | A kind of Elema silicon nitride coating and its preparation process |
| CN109081707A (en) * | 2018-08-28 | 2018-12-25 | 辽阳宏图碳化物有限公司 | A kind of manufacture craft of Elema heating part coating |
-
2002
- 2002-09-05 CN CN02136834.1A patent/CN1280238C/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102491783A (en) * | 2011-11-21 | 2012-06-13 | 西北工业大学 | Repairing method of carbon ceramic brake-disc coating |
| CN102515846A (en) * | 2011-11-23 | 2012-06-27 | 陕西科技大学 | Preparation method of carbon/carbon (C/C) composite material zirconium silicate-silica-zirconium oxide self-healing external coating |
| CN102515846B (en) * | 2011-11-23 | 2013-10-09 | 陕西科技大学 | Preparation method of carbon/carbon (C/C) composite material zirconium silicate-silica-zirconium oxide self-healing external coating |
| CN102515851A (en) * | 2011-12-26 | 2012-06-27 | 天津大学 | Preparation method for silicon-nitride-based coating on surface of porous ceramic |
| CN102515851B (en) * | 2011-12-26 | 2013-04-03 | 天津大学 | Preparation method for silicon-nitride-based coating on surface of porous ceramic |
| CN107224813A (en) * | 2016-03-24 | 2017-10-03 | 日本碍子株式会社 | Amplifier case |
| CN108840686A (en) * | 2018-08-27 | 2018-11-20 | 淄博德瑞兹电热元件有限公司 | A kind of Elema silicon nitride coating and its preparation process |
| CN109081707A (en) * | 2018-08-28 | 2018-12-25 | 辽阳宏图碳化物有限公司 | A kind of manufacture craft of Elema heating part coating |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1280238C (en) | 2006-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU751978B2 (en) | Non-linear resistance with varistor behaviour and method for the production thereof | |
| US4931413A (en) | Glass ceramic precursor compositions containing titanium diboride | |
| CN113643869B (en) | High-stability resistor paste for thick-film resistor | |
| CN1280238C (en) | Face coated carborundum heating unit | |
| CN105236941A (en) | Aluminum oxide anti-static ceramic material and preparation method thereof | |
| CN112645699B (en) | Whisker and MAX phase toughened rare earth silicate material and preparation method thereof | |
| CN107892576A (en) | Silicon carbide ceramics and preparation method thereof and fin and its application | |
| CN104530966A (en) | Graphene-doped high-temperature-resistant organic anticorrosive paint and preparation method thereof | |
| CN109942294A (en) | A kind of rare earth samarium tantalate ceramics of different stoichiometric ratios and preparation method thereof of anti-low melting point oxide corrosion | |
| CN108863393A (en) | A kind of preparation method of high thermal conductivity and high-intensitive aluminium nitride ceramics | |
| US20030000938A1 (en) | Ceramic heater, and ceramic heater resistor paste | |
| US6699522B2 (en) | Inorganic insulation coating material | |
| CN108558389A (en) | A kind of Novel piezoresistor piece resistive formation slurry and preparation method thereof | |
| Alamdari et al. | High energy ball milled nanocrystalline ZnO varistors | |
| CN109136488B (en) | Energy-saving high-temperature radiation spray coating for silicon steel annealing furnace and preparation method and application thereof | |
| CN106747404A (en) | A kind of new ZnO pressure-sensitive ceramic materials without Bi, Pr, V and preparation method thereof | |
| CN1219831C (en) | Silicon carbide heater of surface coating | |
| CN114133237A (en) | Manufacturing method of zero-power ceramic wafer of PTC heater | |
| US5382385A (en) | Sintered varistor material with small particle size | |
| JP2003313078A (en) | Aluminum nitride sintered compact and electrostatic chuck using the same | |
| CN111992707A (en) | Building heat-insulation metal foam and preparation method thereof | |
| CN107903041B (en) | Casket-like bowl and preparation method thereof | |
| CN1170291C (en) | High power heat-sensitive ceramics material and its preparation method | |
| JP2002201074A (en) | Silicon nitride sintered compact and method of manufacturing it | |
| CN114835486B (en) | Conductive ceramic material and preparation method thereof, and conductive ceramic body and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20061018 |
|
| CX01 | Expiry of patent term |