CN206556442U - A kind of thermal gradient furnace of heating element heater from spare to dense - Google Patents

Abstract

This disclosure relates to a kind of thermal gradient furnace of heating element heater from spare to dense.It is the device for the measurement glass liquidus temperature that maximum operation (service) temperature reaches 1600 DEG C, heated by the Si-Mo rod of the U-shaped around alundum tube or annular, Si-Mo rod arrangement is by its spacing by close gradually dilute, the distance of Si-Mo rod heating end and alundum tube is, by closely gradually remote, to realize that the big gradient and thermal field flatness of high temperature modification thermal gradient furnace are distributed.

Description

A kind of thermal gradient furnace of heating element heater from spare to dense

Technical field

This disclosure relates to a kind of horizontal electrical heating high-temperature stove, using Si-Mo rod as heating element heater, its temperature field is gradual change Temperature Distribution, the temperature difference for having 100-300 DEG C, the heating furnace is high temperature thermal gradient furnace, available for glass liquidus curve (the crystallization upper limit Temperature) temperature and material sintering reaction temperature survey.

Background technology

At present, it is usually used when measuring glass liquidus curve (crystallization ceiling temperature) temperature and material sintering reaction temperature ASTM C829-81 (2000) measure the condensing temperature of glass with temperature gradient furnace method, and standard regulation uses electrical heating wire as heating Element, is added by carrying out non-homogeneous winding outside in furnace tubing (being inorganic temperature-resistant material, usually aluminum oxide or corundum material) Heated filament, because the heat energy density of outer surface of furnace tube is different, and then causes temperature in boiler tube different, if electrical heating wire winding is close Degree is gradually sparse from boiler tube one end to the other end, then certain temperature gradient is formed in boiler tube, and this class A furnace A is referred to as thermal gradient furnace.

Electrical heating wire material widely uses ferrum-chromium-aluminum niobium heatproof B alloy wire, and heating-up temperature is only capable of reaching 1000 DEG C, in order to enter One step lifts heating-up temperature, using molybdenum filament as heating source, 1300-1400 DEG C can be lifted, because molybdenum filament is easily aoxidized, when using Air exclusion or the protection of argon gas nitrogen must be carried out, but restricted lifetime is easily damaged, also using expensive platinum wire as adding Thermal source, but can only also be heated to 1450 DEG C.

In order to overcome above-mentioned deficiency, Elema is used as heating source and manufactures thermal gradient furnace, but maximum heating temperature is only capable of 1300 DEG C are reached, but is limited by heating element heater shape itself (straight and U-shaped), temperature is not easily formed around furnace tubing Gradient, even if forming thermograde, also only 100-150 DEG C, shows that temperature gradient is narrow, and the temperature in boiler tube point Zigzag is presented in cloth, is not the thermograde smoothly declined, therefore in glass liquidus curve (crystallization ceiling temperature) temperature and material Can not fully it be covered during material sintering reaction temperature survey.

As the exploitation of the special material such as aluminosilicate, borosilicate needs, glass liquidus curve (crystallization ceiling temperature) temperature As important technological parameter index, restriction glass feed and forming mode, the glass liquidus curve (analysis of some kinds are had a strong impact on Brilliant ceiling temperature) temperature is up to 1500 DEG C.Fast Sintering repercussion study otherwise for some inorganic material works, it is necessary to meet The thermal gradient furnace of 1200-1600 DEG C of wide temperature range, the experimental work of conventional thermostatic stove 10-20 times is once completed in thermal gradient furnace, can So that the time is greatly decreased, experiment number is reduced, scientific research efficiency is improved.

In summary, traditional electrical heating B alloy wire or Elema are as the thermal gradient furnace of heating source, and maximum temperature is difficult to surmount 1400 DEG C, and thermograde is relatively small, only 100-200 DEG C, therefore Special high-temperature type glass liquidus temperature can not be met Being measured with high temperature inorganic material reaction temperature is needed, it is necessary to which can be reached by inventing one kind by 1400 DEG C -1600 DEG C, and temperature difference reaches 100-300 DEG C, the thermal gradient furnace of the even more big temperature difference.

Utility model content

In order to which the thermal gradient furnace temperature in use for solving the heater strip or Elema heating used is not high, and the warm temperature range of ladder It is narrow, and have the unsmooth problem of temperature gradient distribution.Present disclose provides a kind of thermal gradient furnace of heating element heater from spare to dense, in boiler tube Maximum heating temperature can be up to 1600 DEG C, and thermograde is more than 300 DEG C, and temperature drop is smooth in boiler tube, and phase can be achieved Gradient thermal field distribution to uniformly successively decreasing, as a kind of preferable high temperature modification thermal gradient furnace.

Disclosed technique scheme is to control heating furnace by PID modes using intelligent temperature controller, and burner hearth inner tube uses corundum Pipe, boiler tube horizontal positioned, heating rod is U-shaped or annular, and heating rod is looped around the outside of alundum tube, it is preferred that heating rod is Silicon Mo heating rod, its quantity preferably uses 4-8 root Si-Mo rods, 1 temperature-control heat couple, 5-9 branch temperature thermocouples.Silicon highest Temperature in use is up to 1800 DEG C.Realized by adjusting the spacing of Si-Mo rod and the distance of Si-Mo rod heating part and alundum tube Graded is presented in Temperature Distribution in boiler tube, and maximum temperature is up to 1600-1700 DEG C in boiler tube, and thermograde is more than 300 ℃。

The beneficial effect of the disclosure is the temperature upper limit for improving traditional heating silk or Elema as heating source, from 1400 More than 1600 DEG C DEG C are brought up to, and thermograde improves 100-200 DEG C, and thermograde is more than 300 DEG C, can Special high-temperature type glass Glass liquidus temperature and the measurement of high temperature inorganic material reaction temperature, expand measurement warm area scope, effectively reduce pendulous frequency, carry Measurement and scientific research efficiency are risen, preferably solution is especially obtained in terms of Special high-temperature glass liquidus temperature (the recrystallization temperature upper limit) Certainly, while thermograde downward trend is smooth in the thermal gradient furnace boiler tube, there is not sawtooth Temperature Distribution.

Other feature and advantage of the disclosure will be described in detail in subsequent embodiment part.

Brief description of the drawings

Accompanying drawing is, for providing further understanding of the disclosure, and to constitute a part for specification, with following tool Body embodiment is used to explain the disclosure together, but does not constitute limitation of this disclosure.In the accompanying drawings：

Fig. 1 is the high temperature modification thermal gradient furnace structural representation of Si-Mo rod heating.

Description of reference numerals

1. body of heater shell；2. Si-Mo rod；3. temperature-control heat couple；4. temperature thermocouple；

5. corundum porcelain boat；6. porcelain boat supporter；7. furnace lining material；8. corundum furnace tube.

Embodiment

Disclosure patent is further illustrated below in conjunction with the accompanying drawings.

Porcelain boat supporter 6 is placed in alundum tube 8 in Fig. 1, and the corundum porcelain boat 5 for holding test sample is placed on porcelain boat supporter On 6, burner hearth appropriate location is pushed into.Body of heater shell 1 uses metal plastic jetting shell, 1700 DEG C of 7 heatproof of furnace lining material.Si-Mo rod 2 is U Shape or annular, around alundum tube 8, the front and back position of Si-Mo rod 2 and heating end and the distance of alundum tube 8 can be adjusted, with This adjusts terraced temperature area thermograde size and temperature gradient distribution flatness.All Si-Mo rods 2 are series system, are one Heating group, is controlled by one piece of intelligent temperature controller.Temperature-control heat couple 3 is placed between first and second root Si-Mo rod, and first, The distance between two Si-Mo rods are that distance is minimum between each Si-Mo rod, and the distance of two rods and alundum tube 8 is also most It is small, temperature highest herein.Temperature thermocouple 4 is evenly distributed on the length direction of alundum tube 8, and the stove on each aspect is monitored in real time Bore temperature.

The method of the terraced temperature area temperature homogeneity of disclosure adjustment thermal gradient furnace is installation 4-8 root Si-Mo rods, silicon in burner hearth Molybdenum bar to each other away from different, the spacing of the lower Si-Mo rod of temperature is bigger, the spacing of Si-Mo rod heating end and alundum tube Differ, the distance of the lower Si-Mo rod heating end of temperature and alundum tube is more remote, and the thermograde of the terraced temperature area of adjustment body of heater is uniform Property the distance of spacing between Si-Mo rod and Si-Mo rod heating end and alundum tube had both been adjusted to realize.Terraced temperature area sets 5-9 branch Temperature thermocouple monitors the temperature of terraced temperature area in real time.It is final effectively to realize that thermal gradient furnace thermograde is more than 300 DEG C, maximum temperature More than 1600 DEG C, and thermograde smooth distribution.

Claims (2)

1. the thermal gradient furnace of a kind of heating element heater from spare to dense, it is characterised in that the heating rod of U-shaped or annular is looped around alundum tube Outside, heating rod arrangement is by its spacing by close gradually dilute, and the distance of heating rod heating end and alundum tube is by closely gradually remote, heating Rod is connected, and is heated by a temperature control group control, thermocouple is uniformly distributed, and is inserted and is reached inside alundum tube, the temperature inside measurement alundum tube Degree.

2. thermal gradient furnace according to claim 1, it is characterised in that the heating rod is silicon Mo heating rod.