CN1396428A - Directional and regionally setting graphite heater - Google Patents
Directional and regionally setting graphite heater Download PDFInfo
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- CN1396428A CN1396428A CN02112386A CN02112386A CN1396428A CN 1396428 A CN1396428 A CN 1396428A CN 02112386 A CN02112386 A CN 02112386A CN 02112386 A CN02112386 A CN 02112386A CN 1396428 A CN1396428 A CN 1396428A
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- General Induction Heating (AREA)
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Abstract
A graphite heater with directional and regional setting function uses a graphite sleeve as heat receptor of HF coil. A refractory material layer is put between the said graphite sleeve and the HF induction coil for preventing overload of HF power supply, and reducing the heat radiating loss. A specimen is put in a test tube in the center of graphite sleeve. A thermocouple is embedded in the graphite sleeve for measuring its internal temp.. Its advantage is high measuring and control precision.
Description
Technical field:
The present invention relates to a kind of orientation and regionally setting graphite heater, be used for the Overheating Treatment research of melt under the directional freeze condition, belong to the directional freeze control techniques.
Background technology:
Directed and zone freezing is the most frequently used production and the experimental technique that research metallic substance process of setting, coagulating property and material are purified, and also is to produce to have one of important method of oriented freezing organization part and monocrystalline.
Under laboratory condition, research directed and zone freezing research, particularly high-temperature gradient all needs high energy density, generally adopts the high-frequency electromagnetic induction heating.Because the singularity of directed and zone freezing apparatus structure, the melting zone is shorter, and the melting zone constantly moving, and the temperature survey in melting zone is difficulty relatively, especially under vacuum condition, has more increased the difficulty of measurement.Temperature is mainly passed through the temperature in the ratio-frequency heating power budget melting zone of input at present.Relation between ratio-frequency heating power and the melting zone temperature is subjected to influence of various factors, and differing materials is because the magnetic permeability difference, under the identical power conditions, and the temperature difference in melting zone; Even commaterial, because the defective of material internal exists as pore, temperature is also different.Therefore, rely on ratio-frequency heating power to judge the temperature in melting zone, deviation is bigger, and this accurately measures the experimental study of melting zone temperature and thermograde for needs, has brought very big problem, especially needs the occasion of vacuum and other particular requirement at some.If directly, influence sample on the one hand and solidify behavior and pollute sample, on the other hand, be difficult to continuous temperature measurement and the successive temperature control is carried out in the heating zone at the directed and inner thermocouple temperature measurement that adopts of zone freezing sample.Employing flash ranging temperature and since vitrified pipe stop that the temperature of measuring is on the low side, can not reflect the true temperature in melting zone.As with near the thermopair thermometric melting zone, because near the thermograde the melting zone is very big, except that very difficult fixation measuring position, temperature repeatability and the error measured all do not reach requirement.
Another problem of using ratio-frequency heating to run into is a coupling coupling in heat-processed, if sample has the defective of pore or crackle, in heat-processed, the coupling between sample and the coil will change, the temperature of sample inevitably will change, and must influence the reliability of experimental result.
Ratio-frequency heating also influences the behavior of solidifying and the solidified structure of sample to the function composite by electromagnetic stirring of directed and zone freezing and zone freezing sample.The big disturbance of the inner liquid phase in melting zone is a very disadvantageous interfering factors in the experimentation, influences experimental result.Expensive electron beam heating is adopted in many subject studies, and purpose is exactly to avoid induction stirring to influence directed and the zone freezing experiment, but has equipment complexity, the problem that cost of investment is high.
Summary of the invention:
The objective of the invention is to above-mentioned deficiency at prior art, design provides a kind of novel orientation and regionally setting graphite heater, improve the needed high energy density of directional freeze, avoid or reduce induction stirring influence directed and that zone freezing is tested, utilize the small device investment, reach the ideal experimental result.
For realizing such purpose, in the technical scheme of the present invention, adopt the heated body of graphite cannula as radio-frequency induction coil, graphite cannula adopts refractory masses to isolate ruhmkorff coil and graphite cannula outward, prevent that graphite cannula from contacting the mistake load that causes high frequency electric source with ruhmkorff coil, reduce the radiation heat loss of pyrographite cover simultaneously.Place sample in the vitrified pipe at graphite cannula center, temperature thermocouple is imbedded in the graphite cannula after being protected by ceramic sheath, in order to measure the graphite cannula temperature inside.
Radio-frequency coil is the heating graphite cannula earlier, because the high temperature resistant and good conductivity of graphite, graphite cannula is heated to the temperature that needs very soon, then, and by the graphite cannula heating sample.As long as keep the regular hour (15 seconds), the temperature basically identical of the temperature of sample and graphite cannula is by measuring and control the temperature of graphite cannula, the temperature in control sample melting zone.
Secondly, because good coupling coupling between graphite cannula and the radio-frequency coil, between high frequency electric source power and the graphite cannula temperature extraordinary dependency is arranged, one power obtains a temperature, substantially be not subjected to the influence of the factors such as kind of experiment condition such as sample size, sample alloy,, can not change the heating power of power supply different alloys, as long as choose corresponding soaking time, just can obtain identical temperature; The factor of sample itself such as sample internal fissure, pore also reduce greatly to the influence in temperature field, have simplified the preparation work of experiment.
Because the characteristic of graphite, obtaining the needed high frequency electric source power of same temperature also reduces, simultaneously, because graphite is to the shielding effect of higher frequency electromagnetic field, reduce the function composite by electromagnetic stirring of directional freeze sample the higher frequency electromagnetic field, to research curing condition such as thermograde, overheated influence to process of setting is favourable.
The present invention both can be used for the research of Melt Overheating Treatment to the material property influence, can obtain the high-energy-density and the accurate real time temperature of measuring and controlling the sample melting zone of high-frequency induction heating, also can accurately measure and the controlled temperature gradient under the directional freeze condition.
Description of drawings and embodiment:
Fig. 1 is a structural representation of the present invention.
As shown in Figure 1, between radio-frequency induction coil 1 and the graphite cannula 3 one deck refractory masses 2 is arranged, place sample 7 in the vitrified pipe 6 at graphite cannula 3 centers, temperature thermocouple 4 is inserted in the ceramic sheath of imbedding graphite cannula.
3 heating of 1 pair of graphite cannula of radio-frequency induction coil make the very fast intensification of graphite, to 7 second-heating of the sample in vitrified pipe 6 and the vitrified pipe.Under certain heating power condition, graphite furnace reaches an equilibrated temperature.Corresponding different heating powers, graphite furnace all has a fixed temperature.Refractory masses 2 is kept apart radio-frequency induction coil 1 and heated body graphite cannula 3, contacts the mistake load that causes high frequency electric source with ruhmkorff coil to prevent graphite cannula, reduces the radiation heat loss of pyrographite stove simultaneously.Temperature thermocouple 4 is embedded in the graphite cannula, measures the graphite furnace temperature inside.Directional freeze sample 7 is enclosed within the vitrified pipe 6, and vitrified pipe 6 can move up and down in graphite cannula 3.Sample melted by heat in graphite cannula has one section melt zone 5.In the directional freeze experiment, the translational speed of control sample is no more than 5mm/min, and the temperature at center, melting area can reach the temperature of graphite furnace substantially.
In one embodiment of the invention, it is as follows to be used for the parameter of experimental installation of high-temperature gradient directional solidification:
The internal diameter of graphite cannula is 8mm, and external diameter is 50mm, high 25mm; Ruhmkorff coil is the copper tube coiled of 1mm by external diameter for the 5mm wall thickness, totally 3 circles; Refractory masses 3mm.Heating power supply is the 300khz high frequency electric source.
When heating power is that (during 80V * 40A), the graphite cannula temperature reaches 1500 ℃ to 3.2kw, and specimen temperature can reach 1490 ℃.Directly use the induction power supply heating sample and adopt, obtaining same specimen temperature needs the 8kw (heating power of 110V * 65A).
There is good corresponding relation between heating power and the graphite cannula temperature, is not subjected to the influence of sample.At heating power is that (during 80V * 40A), do the directional freeze experiment with two groups of samples (a group is whole, and another group is three sections combinations), when the speed of growth was 10 μ/s, the sample metallographic structure that experiment obtains was identical for 3.2kw.And adopt direct induction heating sample, the metallographic structure of whole sample and three sections composite samples differs greatly.
Claims (2)
1, a kind of orientation and regionally setting graphite heater, it is characterized in that between radio-frequency induction coil (1) and the graphite cannula (3) one deck refractory masses (2) being arranged, place sample (7) in the vitrified pipe (6) at graphite cannula (3) center, temperature thermocouple (4) is imbedded graphite cannula (3).
2, a kind of orientation of claim 1 and heating means of regionally setting graphite heater utilized, it is characterized in that with the heated body of graphite cannula (3) as radio-frequency induction coil (1), by radio-frequency induction coil (1) heating graphite cannula (3), by the sample (7) in heated graphite cannula (3) second-heating vitrified pipe (6) and the vitrified pipe, by being embedded in the temperature of thermopair (4) the continuously measured graphite cannula (3) in the graphite cannula (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02112386A CN1396428A (en) | 2002-07-04 | 2002-07-04 | Directional and regionally setting graphite heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02112386A CN1396428A (en) | 2002-07-04 | 2002-07-04 | Directional and regionally setting graphite heater |
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| Publication Number | Publication Date |
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| CN1396428A true CN1396428A (en) | 2003-02-12 |
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| CN02112386A Pending CN1396428A (en) | 2002-07-04 | 2002-07-04 | Directional and regionally setting graphite heater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265607B (en) * | 2007-11-12 | 2010-06-09 | 中国电子科技集团公司第四十八研究所 | Graphite heater for polycrystalline silicon casting ingot process |
| CN105290378A (en) * | 2014-07-17 | 2016-02-03 | 厦门华海大正电池装备有限公司 | Cast-welding method for lead-acid storage battery tabs |
| CN105603209A (en) * | 2016-03-15 | 2016-05-25 | 东北大学 | Blowing-type induction melting furnace |
| CN109959569A (en) * | 2019-02-14 | 2019-07-02 | 中国工程物理研究院总体工程研究所 | Missile-borne heating device for research structure high temperature and high speed impact response |
-
2002
- 2002-07-04 CN CN02112386A patent/CN1396428A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265607B (en) * | 2007-11-12 | 2010-06-09 | 中国电子科技集团公司第四十八研究所 | Graphite heater for polycrystalline silicon casting ingot process |
| CN105290378A (en) * | 2014-07-17 | 2016-02-03 | 厦门华海大正电池装备有限公司 | Cast-welding method for lead-acid storage battery tabs |
| CN105603209A (en) * | 2016-03-15 | 2016-05-25 | 东北大学 | Blowing-type induction melting furnace |
| CN109959569A (en) * | 2019-02-14 | 2019-07-02 | 中国工程物理研究院总体工程研究所 | Missile-borne heating device for research structure high temperature and high speed impact response |
| CN109959569B (en) * | 2019-02-14 | 2023-10-24 | 中国工程物理研究院总体工程研究所 | Missile-borne heating device for researching high-temperature high-speed impact response of structure |
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