CN101613103A - Fire the method for silicon carbide reaction-sintered with carbon tube furnace - Google Patents
Fire the method for silicon carbide reaction-sintered with carbon tube furnace Download PDFInfo
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- CN101613103A CN101613103A CN200910017328A CN200910017328A CN101613103A CN 101613103 A CN101613103 A CN 101613103A CN 200910017328 A CN200910017328 A CN 200910017328A CN 200910017328 A CN200910017328 A CN 200910017328A CN 101613103 A CN101613103 A CN 101613103A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The invention discloses a kind of method of firing silicon carbide reaction-sintered with carbon tube furnace, in sintering procedure, in burner hearth, feed nitrogen and waste gas is discharged from the waste gas outlet that is positioned at opening for feed and discharge port from preheating area segments and cooled region section respectively, make the nitrogen pressure in the burner hearth keep constant.Be formed for the nitrogen curtain of atmosphere inside and outside the isolated burner hearth by blowing device.Nitrogen inlet and nitrogen outlet by independent setting feed nitrogen in the heating chamber of the high-temperature area section of burner hearth, and make the nitrogen pressure in the heating chamber keep constant.The invention has the advantages that to greatly reduce that it is oxidized to make that product is difficult for, and has improved yield rate to vacuum requirements; Because product lowers the temperature without blowing out, realize electricity saving and energy saving, power consumption is original 3/4ths; Because carbon tube furnace two ends and atmosphere are connected, an endfeed one brings out material, has realized working continuously, and whole sintering procedure was reduced to 6 to 10 hours by original 2 to 3 days, had shortened the production cycle of product greatly.
Description
Technical field
The present invention relates to a kind of method for cooking of silicon carbide reaction-sintered product, relate in particular to a kind of method of firing silicon carbide reaction-sintered with carbon tube furnace.
Background technology
At present, the silicon carbide reaction-sintered goods still are a kind of new high-tech product, and the international country that can produce this product also is not a lot.When firing the silicon carbide reaction-sintered product, be to use vacuum induction furnace at present both at home and abroad always, vacuum tightness requires under the state less than 10Pa in the body of heater in sintering procedure, adopt the magneticinduction electrically heated, rise to 1700 ℃ from normal temperature and fire, the whole process of firing needs 7-10 hour, by the blowing out cooling temperature is cooled to 100 ℃ from 1700 ℃ again, thereby finish firing of whole prod, 2 to the 3 day time of the whole process need that a stove product is finished.Its technical process is fair long complicated, and power consumption is big, and efficient is low, and in sintering procedure, because silicon carbide products is very easily oxidized, it must be vacuumized continuously with the two-stage vacuum pump, and is very strict to vacuum requirements, makes that the yield rate of product is low.
Summary of the invention
Technical problem to be solved by this invention is: a kind of method of firing silicon carbide reaction-sintered with carbon tube furnace is provided, this method not only can continuous firing silicon carbide reaction-sintered product, improves production efficiency the reduction of erection time, and can improve yield rate, obviously cut down the consumption of energy.
For solving the problems of the technologies described above, technical scheme of the present invention is: the method for firing silicon carbide reaction-sintered with carbon tube furnace, described carbon tube furnace comprises horizontally disposed body of heater, be provided with burner hearth in the described body of heater, described burner hearth is divided into preheating area segments, high-temperature area section and cooled region section from the opening for feed to the discharge port, described high-temperature area section comprises the protection charcoal pipe that is positioned at inner work charcoal pipe and is positioned at the outside, form heating chamber between described work charcoal pipe and the protection charcoal pipe, heating charcoal pipe is arranged in the described heating chamber; In sintering procedure, in burner hearth, feed nitrogen and waste gas is discharged from the waste gas outlet that is positioned at opening for feed and discharge port from preheating area segments and cooled region section respectively, make the nitrogen pressure in the burner hearth keep constant.
Wherein, at the opening for feed and the discharge port place of burner hearth blowing device is set respectively, in sintering procedure, is formed for the nitrogen curtain of atmosphere inside and outside the isolated burner hearth by blowing device.
Wherein, nitrogen inlet and nitrogen outlet by independent setting feed nitrogen in the heating chamber of the high-temperature area section of burner hearth, and make the nitrogen pressure in the heating chamber keep constant.
Wherein, be provided with auxiliary nitrogen inlet, when the maintenance temperature tube, in burner hearth, feed nitrogen and make the nitrogen pressure in the burner hearth keep constant by described auxiliary nitrogen inlet at the temperature tube place of described burner hearth.
Wherein, be equipped with under meter and variable valve on described each bar nitrogen path.
After having adopted technique scheme, the invention has the beneficial effects as follows: because in sintering procedure, in burner hearth, feed nitrogen and waste gas is discharged from the waste gas outlet that is positioned at opening for feed and discharge port from preheating area segments and cooled region section respectively, make the nitrogen pressure in the burner hearth keep constant, thereby under normal pressure or slight positive pressure state, protective reaction sintered silicon carbon product is not oxidized, has improved yield rate; Because carbon tube furnace one endfeed one brings out material, two ends are connected with atmosphere respectively, thereby realized working continuously, improved production efficiency, the whole process of firing was reduced to 6 to 10 hours by original 2 to 3 days, had shortened firing the cycle of product greatly, lowered the temperature without blowing out owing to product simultaneously, realized economize on electricity consumption reduction, the power consumption consumption is original 3/4ths.
Owing to be provided with blowing device respectively at the opening for feed and the discharge port place of burner hearth, in sintering procedure, be formed for the nitrogen curtain of atmosphere inside and outside the isolated burner hearth by blowing device, enter burner hearth, help strengthening the nitrogen atmosphere in the burner hearth thereby reduced outside air greatly.
Because in sintering procedure; nitrogen inlet and nitrogen outlet by independent setting feed nitrogen in the heating chamber of the high-temperature area section of burner hearth; and make the nitrogen pressure in the heating chamber keep constant; thereby reduced the oxidation of air, improved equipment reliability of operation and work-ing life high-temperature area section work charcoal pipe, protection charcoal pipe and heating charcoal pipe.
Owing to be provided with auxiliary nitrogen inlet at the temperature tube place of described burner hearth, when the maintenance temperature tube, in burner hearth, feed nitrogen and make the nitrogen pressure in the burner hearth keep constant by described auxiliary nitrogen inlet, thereby when temperature tube breaks down, realize not shutdown maintenance.
Embodiment
A kind of method of firing the silicon carbide reaction-sintered product, this method is implemented in carbon tube furnace.
Described carbon tube furnace comprises horizontally disposed body of heater; be provided with burner hearth in the described body of heater; described burner hearth is divided into preheating area segments, high-temperature area section and cooled region section from the opening for feed to the discharge port; described high-temperature area section comprises the protection charcoal pipe that is positioned at inner work charcoal pipe and is positioned at the outside; form heating chamber between described work charcoal pipe and the protection charcoal pipe, heating charcoal pipe is arranged in the described heating chamber.Under the promotion of feed appliance, the blank of firing the silicon carbide reaction-sintered product enters then from discharge hole for discharge from the opening for feed of burner hearth,, compares not what too big variation with regard to this point with common carbon tube furnace.Innovative point of the present invention is, in sintering procedure, feeds nitrogen and waste gas is discharged from the waste gas outlet that is positioned at opening for feed and discharge port in burner hearth from preheating area segments and cooled region section respectively, makes the nitrogen pressure in the burner hearth keep constant.
And, at the opening for feed and the discharge port place of burner hearth blowing device is set respectively, in sintering procedure, be formed for the nitrogen curtain of atmosphere inside and outside the isolated burner hearth by blowing device.
And, in the heating chamber of the high-temperature area section of burner hearth, feed nitrogen by the nitrogen inlet and the nitrogen outlet of independent setting, and make the nitrogen pressure in the heating chamber keep constant.
And, be provided with auxiliary nitrogen inlet at the temperature tube place of described burner hearth, when the maintenance temperature tube, in burner hearth, feed nitrogen and make the nitrogen pressure in the burner hearth keep constant by described auxiliary nitrogen inlet.
On each above-mentioned bar nitrogen path, be equipped with under meter and variable valve.
Principle of work of the present invention is: under normal pressure or slight positive pressure state, the blank of silicon carbide reaction-sintered product under the promotion of feed appliance, is successively finished sintering procedure through preheating area segments, high-temperature area section and cooled region section under protection of nitrogen gas atmosphere.In the whole process of firing, nitrogen feeds burner hearth by preheating area segments and cooled region section, and the protection product can be not oxidized.Nitrogen should feed endlessly, and waste gas is discharged from the waste gas outlet that is positioned at opening for feed and discharge port, makes by variable valve that the concentration of nitrogen remains constant in the body of heater.In order to protect work charcoal pipe, protection charcoal pipe and heating charcoal pipe, also be provided with independently nitrogen inlet and nitrogen outlet in the high-temperature area section specially.An end is that opening for feed one end is a discharge port because the two ends, two ends of carbon tube furnace directly communicate with atmosphere, so just can realize working continuously.In each sintering procedure, the preheating area segments is to adopt to be provided with automatic, manual temperature controlling function, it is list-directed to have the intelligent temperature controller of setting functions such as best pid value, temperature compensation from motion tracking, the high-temperature zone is then selected the control automatically of far infrared rays temperature control instrument, the temperature of each warm area of control that like this can be stricter for use.And on the mode of heating, set different type of heating, product is controlled temperature according to firing required heating curve fully according to the needs that each warm area is obstructed.The finished product under 300 ℃ of-2000 ℃ of temperature, under nitrogen protection, are continuously fired silicon carbide products in carbon tube furnace.The whole process of firing needs 6-10 hour.By the cooling water jacket of cooling zone the silicon carbide products cooling that sinters is finished the making processes of whole prod at last.
The invention has the advantages that the requirement that greatly reduces vacuum, so that product is difficult for is oxidized, carry High yield rate; Because product lowers the temperature without blowing out, realize electricity saving and energy saving, power consumption be original four/ Three; Because carbon shirt-circuiting furnace two ends and atmosphere are connected, an endfeed one brings out material, thereby has realized working continuously, Improved output, the whole process of firing was down to 6 to 10 hours by original 2 to 3 days, greatly contracting Lacked firing the cycle of product.
Claims (5)
1. fire the method for silicon carbide reaction-sintered with carbon tube furnace, described carbon tube furnace comprises horizontally disposed body of heater, be provided with burner hearth in the described body of heater, described burner hearth is divided into preheating area segments, high-temperature area section and cooled region section from the opening for feed to the discharge port, described high-temperature area section comprises the protection charcoal pipe that is positioned at inner work charcoal pipe and is positioned at the outside, form heating chamber between described work charcoal pipe and the protection charcoal pipe, heating charcoal pipe is arranged in the described heating chamber; It is characterized in that: in sintering procedure, in burner hearth, feed nitrogen and waste gas is discharged from the waste gas outlet that is positioned at opening for feed and discharge port from preheating area segments and cooled region section respectively, make the nitrogen pressure in the burner hearth keep constant.
2. the method for firing silicon carbide reaction-sintered with carbon tube furnace as claimed in claim 1, it is characterized in that: at the opening for feed and the discharge port place of burner hearth blowing device is set respectively, in sintering procedure, be formed for the nitrogen curtain of atmosphere inside and outside the isolated burner hearth by blowing device.
3. the method for firing silicon carbide reaction-sintered with carbon tube furnace as claimed in claim 1 or 2, it is characterized in that: nitrogen inlet and nitrogen outlet by independent setting feed nitrogen in the heating chamber of the high-temperature area section of burner hearth, and make the nitrogen pressure in the heating chamber keep constant.
4. the method for firing silicon carbide reaction-sintered with carbon tube furnace as claimed in claim 3, it is characterized in that: the temperature tube place at described burner hearth is provided with auxiliary nitrogen inlet, when the maintenance temperature tube, in burner hearth, feed nitrogen and make the nitrogen pressure in the burner hearth keep constant by described auxiliary nitrogen inlet.
5. as claimed in claim 4ly fire the method for silicon carbide reaction-sintered, it is characterized in that: be equipped with under meter and variable valve on described each bar nitrogen path with carbon tube furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910017328A CN101613103A (en) | 2009-07-27 | 2009-07-27 | Fire the method for silicon carbide reaction-sintered with carbon tube furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910017328A CN101613103A (en) | 2009-07-27 | 2009-07-27 | Fire the method for silicon carbide reaction-sintered with carbon tube furnace |
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| CN101613103A true CN101613103A (en) | 2009-12-30 |
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| CN200910017328A Pending CN101613103A (en) | 2009-07-27 | 2009-07-27 | Fire the method for silicon carbide reaction-sintered with carbon tube furnace |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288023A (en) * | 2011-07-21 | 2011-12-21 | 常熟皮爱尔奇磁性科技有限公司 | Electronic-product sintering furnace for protecting gas from losing during obstacle removal |
| CN102288024A (en) * | 2011-07-21 | 2011-12-21 | 常熟皮爱尔奇磁性科技有限公司 | Sintering-atmosphere loss-free obstacle-removing device for ferrite-sintering furnace |
| CN102730686A (en) * | 2012-07-16 | 2012-10-17 | 长沙伟徽高科技新材料股份有限公司 | Method for preparing refractory metal carbide solid solution by using carbon tube furnace |
| CN104129787A (en) * | 2014-08-18 | 2014-11-05 | 宋克纯 | Silicon carbide smelting equipment applied to tail gas recovery |
| CN113834213A (en) * | 2021-09-18 | 2021-12-24 | 湖南骅骝新材料有限公司 | High-efficient safe high pressure nitrogen heater |
-
2009
- 2009-07-27 CN CN200910017328A patent/CN101613103A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288023A (en) * | 2011-07-21 | 2011-12-21 | 常熟皮爱尔奇磁性科技有限公司 | Electronic-product sintering furnace for protecting gas from losing during obstacle removal |
| CN102288024A (en) * | 2011-07-21 | 2011-12-21 | 常熟皮爱尔奇磁性科技有限公司 | Sintering-atmosphere loss-free obstacle-removing device for ferrite-sintering furnace |
| CN102288023B (en) * | 2011-07-21 | 2012-11-07 | 常熟皮爱尔奇磁性科技有限公司 | Electronic-product sintering furnace for protecting gas from losing during obstacle removal |
| CN102288024B (en) * | 2011-07-21 | 2012-11-21 | 常熟皮爱尔奇磁性科技有限公司 | Sintering-atmosphere loss-free obstacle-removing device for ferrite-sintering furnace |
| CN102730686A (en) * | 2012-07-16 | 2012-10-17 | 长沙伟徽高科技新材料股份有限公司 | Method for preparing refractory metal carbide solid solution by using carbon tube furnace |
| CN104129787A (en) * | 2014-08-18 | 2014-11-05 | 宋克纯 | Silicon carbide smelting equipment applied to tail gas recovery |
| CN113834213A (en) * | 2021-09-18 | 2021-12-24 | 湖南骅骝新材料有限公司 | High-efficient safe high pressure nitrogen heater |
| CN113834213B (en) * | 2021-09-18 | 2022-08-26 | 湖南骅骝新材料有限公司 | High-efficient safe high pressure nitrogen heater |
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Open date: 20091230 |