Preparation method of superhigh-temperature anti-oxidative ceramic heating unit

A ceramic heating element and anti-oxidation technology, applied in the field of heating element preparation, can solve the problems of an oxidizing environment that cannot be applied to ultra-high temperature, poor oxidation resistance of graphite heating element, etc., and achieve the effects of good mechanical properties and broad application prospects.

Inactive Publication Date: 2018-09-07
田秋珍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main technical problem to be solved by the present invention is that the zirconia heating element in the current ceramic heating element must be heated to above 1000°C with an auxiliary heating element or preheating equipment before it can work, and the graphite heating element has poor oxidation resistance, only It is suitable for application in ultra-high temperature vacuum or inert environment, but cannot be applied to the defect of ultra-high temperature oxidation environment, and provides a preparation method of ultra-high temperature anti-oxidation ceramic heating element

Method used

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  • Preparation method of superhigh-temperature anti-oxidative ceramic heating unit

Examples

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Effect test

example 1

[0024] Add 40mL of butyl titanate into a beaker containing 180mL of a 25% ethylene glycol solution by mass fraction, heat up to 80°C, add 30g of citric acid into the beaker, start the stirrer, and stir and mix at a speed of 300r / min. Until the citric acid is completely dissolved, a light yellow transparent solution is obtained; 20g of neodymium oxide and 30g of lanthanum oxide are dissolved in 200mL of nitric acid solution with a mass fraction of 30%, to obtain a rare earth metal salt solution of nitrate. In parts by weight, 70 parts The above light yellow transparent solution, 20 parts of rare earth metal nitrate solution, 4 parts of calcium carbonate, 6 parts of lithium carbonate, and 40 parts of zirconia were mixed and placed in a water bath, heated to 80°C, kept for 2 hours, and continued to heat up to 130°C ℃, keep warm for 1 hour to get a thick resin; put the thick resin in a coking furnace, pass nitrogen gas, heat up to 230 ℃, keep warm and coke for 30 minutes, put it in...

example 2

[0026] Add 45mL of butyl titanate into a beaker containing 190mL of 25% ethylene glycol solution by mass fraction, heat up to 90°C, add 32g of citric acid into the beaker, start the stirrer, and stir and mix at a speed of 320r / min. Until the citric acid is completely dissolved, a light yellow transparent solution is obtained; 22g of neodymium oxide and 32g of lanthanum oxide are dissolved in 220mL of nitric acid solution with a mass fraction of 30%, to obtain a rare earth metal salt solution of nitrate. In parts by weight, 75 parts The above-mentioned light yellow transparent solution, 25 parts of rare earth metal nitrate solution, 4 parts of calcium carbonate, 6 parts of lithium carbonate, and 45 parts of zirconia were mixed and placed in a water bath, heated to 82 ° C, kept for 2.5 hours, and continued to heat up to 140°C, keep warm for 1.5h to get a thick resin; put the thick resin into a coking furnace, feed nitrogen, heat up to 240°C, keep warm and coke for 32min, put it i...

example 3

[0028] Add 50mL of butyl titanate into a beaker containing 200mL of ethylene glycol solution with a mass fraction of 25%, heat up to 100°C, add 35g of citric acid into the beaker, start the stirrer, and stir and mix at a speed of 350r / min. Until the citric acid is completely dissolved, a light yellow transparent solution is obtained; 25g of neodymium oxide and 35g of lanthanum oxide are dissolved in 250mL of nitric acid solution with a mass fraction of 30%, to obtain a rare earth metal salt solution of nitrate, and 80 parts by weight The above light yellow transparent solution, 30 parts of rare earth metal nitrate solution, 5 parts of calcium carbonate, 7 parts of lithium carbonate, and 50 parts of zirconia were mixed and placed in a water bath, heated to 85 ° C, kept for 3 hours, and continued to heat up to 150 °C ℃, keep it warm for 2 hours to get a thick resin; put the thick resin in a coking furnace, feed nitrogen, heat up to 250°C, keep it warm for 35 minutes, put it into ...

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Abstract

The invention discloses a preparation method of a superhigh-temperature anti-oxidative ceramic heating unit and belongs to the technical field of heating unit preparation. The ceramic heating unit isdivided into an inner layer and an outer layer, and graphite is taken as a doping component for the inner layer of the heating unit, so that heat conducting capacity of the inner layer of the heatingunit is improved; by means of added rare-earth metal, electrical resistivity and high-temperature strength of ceramics can be improved, ceramic crystal grains are refined, and creep rate can be reduced. According to the preparation method, molybdenum and silicon in molybdenum disilicide are bonded through metallic bonds, silicon is bonded through covalent bonds, molybdenum disilicide is tetragonalcrystal, when the temperature of a heating element is higher than 1700 DEG C, an SiO2 protecting film can be formed, can be condensed at the melting point of 1710 DEG C and is fused with SiO2 to formmolten drops, and the inner layer of the heating unit is covered, so that highly conductive substances such as graphite and the like are protected from being oxidized; furthermore, by means of synergistic effect of mutual filling of silicon carbide and bentonite, the prepared ceramic material has good mechanical properties at superhigh-temperature and has broad application prospect.

Description

technical field [0001] The invention discloses a method for preparing an ultra-high temperature oxidation-resistant ceramic heating element, which belongs to the technical field of heating element preparation. Background technique [0002] The ceramic heating element is a heating element made by sintering the electric heating element and ceramics at high temperature and fixing them together. The resistance can be adjusted according to the temperature of the body, so that the temperature can be kept at the set value without overheating. Energy saving, safety, long life and so on. This kind of heater does not emit light when it is working, has no open flame, no oxygen consumption, soft air supply and automatic constant temperature function. The output power of the PTC ceramic heater is 800-1250 watts, the temperature can be adjusted at will, there is no light consumption during work, and there is an automatic switch device, which is highly efficient, energy-saving, and safe. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/532C04B35/622C04B35/64
CPCC04B35/49C04B35/522C04B35/532C04B35/622C04B35/64C04B2235/3203C04B2235/3208C04B2235/3224C04B2235/3227C04B2235/349C04B2235/3826C04B2235/3891C04B2235/6562C04B2235/6567C04B2235/658C04B2235/6581C04B2235/661C04B2235/96C04B2235/9607C04B2235/9684
Inventor 田秋珍何伟仁陈可
Owner 田秋珍
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