CN107043271B - Ceramic heater - Google Patents
Ceramic heater Download PDFInfo
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- CN107043271B CN107043271B CN201710069162.4A CN201710069162A CN107043271B CN 107043271 B CN107043271 B CN 107043271B CN 201710069162 A CN201710069162 A CN 201710069162A CN 107043271 B CN107043271 B CN 107043271B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 235000015895 biscuits Nutrition 0.000 claims description 11
- 238000005245 sintering Methods 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- IRAGEBXSFXWYNX-UHFFFAOYSA-N 2-(1,3,5-triazinan-1-yl)ethanol Chemical compound OCCN1CNCNC1 IRAGEBXSFXWYNX-UHFFFAOYSA-N 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 5
- 238000000498 ball milling Methods 0.000 claims description 5
- 239000008187 granular material Substances 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 5
- 230000003179 granulation Effects 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 238000000462 isostatic pressing Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 235000011837 pasties Nutrition 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 5
- ALVYUZIFSCKIFP-UHFFFAOYSA-N triethoxy(2-methylpropyl)silane Chemical compound CCO[Si](CC(C)C)(OCC)OCC ALVYUZIFSCKIFP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002904 solvent Substances 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 abstract 1
- 235000014347 soups Nutrition 0.000 description 9
- 238000010411 cooking Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 235000005911 diet Nutrition 0.000 description 1
- 230000037213 diet Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0038—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter
- C04B38/0041—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter the particulate matter having preselected particle sizes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B2235/3865—Aluminium nitrides
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- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
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- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
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- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
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- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
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Abstract
A ceramic heater is composed of the following raw materials in parts by weight: al with particle size of 150-200 microns2O3: 50-65 parts; SiO with particle size of 80-100 microns2: 10-20 parts; MgO with the particle size of 50-60 microns: 8-12 parts of a solvent; si with particle size of 30-40 microns3N4: 5-10 parts; y with particle size of 10-20 microns2O3: 4-7 parts; AlN with the granularity of 500-600 nm: 2-5 parts; the particle size of the pretreated graphene is 50-200 nm: 1-3 parts. The ceramic heater has the advantages of excellent heat transfer performance, heat preservation effect, good thermal shock resistance and capability of keeping a stable structure in a hot and cold environment.
Description
Technical Field
The invention relates to the technical field of heatable ceramics, in particular to a ceramic heater with excellent thermal shock property.
Background
Soup cooking is a traditional nutritional diet making method in China, and generally a ceramic pot is needed to cook soup. However, the ceramic pot for cooking soup has a disadvantage that if cold water is added in the middle of cooking soup, cracks may be generated in the pot body.
At present, the electric rice cooker is often used for cooking soup, but the inner pot body is made of metal products and cannot achieve the effect of ceramic soup cooking. If the ceramic pot body is used as the inner container of the electric cooker, the potential safety hazard of easy cracking exists. In addition, the heating plate is arranged at the bottom of the existing electric cooker, the heat transfer performance of the ceramic pot is far inferior to that of a metal pot, the heating efficiency is very low, and the soup cooking time can be greatly delayed.
Disclosure of Invention
In view of the above problems of the prior art, the present applicant provides a ceramic heater. The ceramic heater has excellent heat transfer performance, heat insulating effect, high heat shock resistance and stable structure in sudden cold and sudden heat environment.
The technical scheme of the invention is as follows:
a ceramic heater is composed of the following raw materials in parts by weight:
al with particle size of 150-200 microns2O3: 50-65 parts;
SiO with particle size of 80-100 microns2: 10-20 parts;
MgO with the particle size of 50-60 microns: 8-12 parts of a solvent;
particle size30 to 40 μm Si3N4: 5-10 parts;
y with particle size of 10-20 microns2O3: 4-7 parts;
AlN with the granularity of 500-600 nm: 2-5 parts;
the particle size of the pretreated graphene is 50-200 nm: 1-3 parts;
the method for pretreating graphene comprises the following steps: adding 3-5% by mass of hydroxyethyl hexahydro-s-triazine and graphene into 3-5 wt% acetone solution, ultrasonically dispersing for 50-80 minutes under the condition of stirring, and drying to obtain powder.
Preferably, the ceramic heater is composed of the following raw materials in parts by weight:
al with particle size of 150-200 microns2O3: 55 parts of (1);
SiO with particle size of 80-100 microns2: 15 parts of (1);
MgO MgO with the particle size of 50-60 microns: 10 parts of (A);
si with particle size of 30-40 microns3N4: 8 parts of a mixture;
y with particle size of 10-20 microns2O3: 6 parts of (1);
AlN with the granularity of 500-600 nm: 4 parts of a mixture;
the particle size of the pretreated graphene is 50-200 nm: and 2 parts.
A preparation method of a ceramic heater comprises the following specific steps:
(1) after all the raw materials are mixed, adding anhydrous ethanol with the weight of 30-40% of the raw materials and an isobutyl triethoxy silane coupling agent with the weight of 10-12% of the pretreated graphene, and putting the mixture into a planetary mill for mixing and grinding for 2-3 hours;
(2) carrying out spray granulation on a pasty product obtained after ball milling, and preparing a granulated material into a biscuit with a required shape by adopting an isostatic pressing method;
(3) sintering the biscuit at high temperature, wherein the sintering temperature is 1350-1420 ℃, and the time is kept for 90-110 minutes;
(4) and then cooling to room temperature at the speed of 10-15 ℃ per minute, keeping the room temperature for 30-40 minutes, then tempering, keeping the room temperature for 30-50 minutes at 550-620 ℃, and then naturally cooling to the room temperature.
The beneficial technical effects of the invention are as follows:
the invention adopts a granularity grading method, so that the prepared ceramic heating body has a microscopic porous shape and very good thermal shock resistance. Generally, the heat transfer performance of the ceramic with the porous structure is poor, but the graphene is added in the invention, so that the influence of the thermal conductivity caused by the porous structure is compensated. Since the graphene is easy to agglomerate and not easy to disperse uniformly without treatment, the graphene is pretreated by the method, so that the graphene is not only good in dispersity, but also uniformly distributed in a ceramic biscuit, and the prepared finished product is uniform in heat transfer and cannot be locally heated.
The ceramic heater prepared by the invention is made into a shape of a pot, a plurality of circles of heating wires are pasted on the outer surface of the pot body by adopting a screen printing or pasting method, and the pot body is put into a heat-preserving and high-temperature-resistant outer sleeve, so that the electric heating ceramic soup cooking pot can be made. Can also be made into a sealed pot body for cooking soup under high pressure. The pot can resist the high-low temperature alternating environment of 0-300 ℃, and is fully sufficient in daily life.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
A ceramic heater is composed of the following raw materials in parts by weight: al with particle size of 150-200 microns2O3: 50 parts of a mixture; SiO with particle size of 80-100 microns2: 10 parts of (A); MgO with the particle size of 50-60 microns: 8 parts of a mixture; si with particle size of 30-40 microns3N4: 5 parts of a mixture; y with particle size of 10-20 microns2O3: 4 parts of a mixture; AlN with the granularity of 500-600 nm: 2 parts of (1); the particle size of the pretreated graphene is 50-200 nm: 1 part;
the method for pretreating graphene comprises the following steps: hydroxyethyl hexahydro-s-triazine with the mass of 3% of graphene is added into an acetone solution with the concentration of 3 wt% together with the graphene, ultrasonically dispersed for 50 minutes under the condition of stirring, and then dried into powder. The preparation method of the ceramic heater comprises the following specific steps:
(1) after all the raw materials are mixed, adding anhydrous ethanol with the weight of 30% of the raw materials and isobutyl triethoxy silane coupling agent with the weight of 10% of the pretreated graphene, and putting the mixture into a planetary mill for mixing and grinding for 2 hours;
(2) carrying out spray granulation on a pasty product obtained after ball milling, and preparing a granulated material into a biscuit with a required shape by adopting an isostatic pressing method;
(3) sintering the biscuit at high temperature, wherein the sintering temperature is 1350 ℃, and the sintering time is kept for 110 minutes;
(4) then cooling to room temperature at a rate of 10 ℃ per minute, tempering after 30 minutes at room temperature, holding at 550 ℃ for 50 minutes, and then naturally cooling to room temperature.
Example 2
A ceramic heater is composed of the following raw materials in parts by weight: al with particle size of 150-200 microns2O3: 55 parts of (1); SiO with particle size of 80-100 microns2: 15 parts of (1); MgO MgO with the particle size of 50-60 microns: 10 parts of (A); si with particle size of 30-40 microns3N4: 8 parts of a mixture; y with particle size of 10-20 microns2O3: 6 parts of (1); AlN with the granularity of 500-600 nm: 4 parts of a mixture; the particle size of the pretreated graphene is 50-200 nm: and 2 parts.
The method for pretreating graphene comprises the following steps: hydroxyethyl hexahydro-s-triazine with the mass of 4% of graphene is added into an acetone solution with the concentration of 4 wt% together with the graphene, ultrasonically dispersed for 60 minutes under the condition of stirring, and then dried into powder. The preparation method of the ceramic heater comprises the following specific steps:
(1) after all the raw materials are mixed, anhydrous ethanol with the weight of 35% of the raw materials and isobutyl triethoxy silane coupling agent with the weight of 11% of the pretreated graphene are added, and the mixture is placed into a planetary mill for mixing and grinding for 2.5 hours;
(2) carrying out spray granulation on a pasty product obtained after ball milling, and preparing a granulated material into a biscuit with a required shape by adopting an isostatic pressing method;
(3) sintering the biscuit at high temperature of 1400 ℃ for 100 minutes;
(4) then cooling to room temperature at a rate of 12 ℃ per minute, tempering after holding at room temperature for 35 minutes, holding at 600 ℃ for 40 minutes, and then naturally cooling to room temperature.
Example 3
A ceramic heater is composed of the following raw materials in parts by weight: al with particle size of 150-200 microns2O3: 65 parts of (1); SiO with particle size of 80-100 microns2: 20 parts of (1); MgO with the particle size of 50-60 microns: 12 parts of (1); si with particle size of 30-40 microns3N4: 10 parts of (A); y with particle size of 10-20 microns2O3: 7 parts; AlN with the granularity of 500-600 nm: 5 parts of a mixture; the particle size of the pretreated graphene is 50-200 nm: 3 parts of a mixture;
the method for pretreating graphene comprises the following steps: adding 5% by mass of hydroxyethyl hexahydro-s-triazine and graphene into 5 wt% acetone solution, ultrasonically dispersing for 50-80 minutes under the condition of stirring, and drying to obtain powder. The preparation method of the ceramic heater comprises the following specific steps:
(1) after all the raw materials are mixed, adding anhydrous ethanol with the weight of 40% of the raw materials and isobutyl triethoxy silane coupling agent with the weight of 12% of the pretreated graphene, and putting the mixture into a planetary mill for mixing and grinding for 3 hours;
(2) carrying out spray granulation on a pasty product obtained after ball milling, and preparing a granulated material into a biscuit with a required shape by adopting an isostatic pressing method;
(3) sintering the biscuit at high temperature, wherein the sintering temperature is 1420 ℃, and keeping the sintering time for 90 minutes;
(4) then cooling to room temperature at a rate of 15 ℃ per minute, tempering after 40 minutes at room temperature, keeping for 30 minutes at 620 ℃, and then naturally cooling to room temperature.
Test example:
the ceramic bodies prepared in examples 1 to 3 were subjected to performance tests, and the test results are shown in table 1.
TABLE 1
Remarking: in table 1, the thermal conductivity was measured at 25 ℃; the thermal shock resistance is tested alternately at-10 deg.C to 500 deg.C.
Claims (1)
1. A ceramic heater is characterized by comprising the following raw materials in parts by weight:
al with particle size of 150-200 microns2O3: 55 parts of (1);
SiO with particle size of 80-100 microns2: 15 parts of (1);
MgO with the particle size of 50-60 microns: 10 parts of (A);
si with particle size of 30-40 microns3N4: 8 parts of a mixture;
y with particle size of 10-20 microns2O3: 6 parts of (1);
AlN with the granularity of 500-600 nm: 4 parts of a mixture;
the particle size of the pretreated graphene is 50-200 nm: 2 parts of (1);
the method for pretreating graphene comprises the following steps: adding 3-5% by mass of hydroxyethyl hexahydro-s-triazine and graphene into 3-5 wt% acetone solution, ultrasonically dispersing for 50-80 minutes under the condition of stirring, and drying to obtain powder;
the preparation method of the ceramic heater comprises the following specific steps:
(1) after all the raw materials are mixed, adding anhydrous ethanol with the weight of 30-40% of the raw materials and an isobutyl triethoxy silane coupling agent with the weight of 10-12% of the pretreated graphene, and putting the mixture into a planetary mill for mixing and grinding for 2-3 hours;
(2) carrying out spray granulation on a pasty product obtained after ball milling, and preparing a granulated material into a biscuit with a required shape by adopting an isostatic pressing method;
(3) sintering the biscuit at high temperature, wherein the sintering temperature is 1350-1420 ℃, and the time is kept for 90-110 minutes;
(4) and then cooling to room temperature at the speed of 10-15 ℃ per minute, keeping the room temperature for 30-40 minutes, then tempering, keeping the room temperature for 30-50 minutes at 550-620 ℃, and then naturally cooling to the room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710069162.4A CN107043271B (en) | 2017-02-08 | 2017-02-08 | Ceramic heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710069162.4A CN107043271B (en) | 2017-02-08 | 2017-02-08 | Ceramic heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107043271A CN107043271A (en) | 2017-08-15 |
| CN107043271B true CN107043271B (en) | 2020-07-17 |
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| CN103194165A (en) * | 2013-04-26 | 2013-07-10 | 中国电子科技集团公司第三十八研究所 | Method for preparing high-heat-conductivity conductive adhesive containing graphene |
| CN104150885A (en) * | 2014-07-17 | 2014-11-19 | 安徽省含山民生瓷业有限责任公司 | Ceramic pancake turner with good heat dissipation performance and preparation process of ceramic pancake turner |
| CN104876611A (en) * | 2015-04-09 | 2015-09-02 | 浙江泰索科技有限公司 | Graphene-reinforced ceramic and preparation method thereof |
| CN105967690A (en) * | 2016-04-22 | 2016-09-28 | 合肥工业大学 | Method for mixing superfine powder and large-particle-diameter particles |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103194165A (en) * | 2013-04-26 | 2013-07-10 | 中国电子科技集团公司第三十八研究所 | Method for preparing high-heat-conductivity conductive adhesive containing graphene |
| CN104150885A (en) * | 2014-07-17 | 2014-11-19 | 安徽省含山民生瓷业有限责任公司 | Ceramic pancake turner with good heat dissipation performance and preparation process of ceramic pancake turner |
| CN104876611A (en) * | 2015-04-09 | 2015-09-02 | 浙江泰索科技有限公司 | Graphene-reinforced ceramic and preparation method thereof |
| CN105967690A (en) * | 2016-04-22 | 2016-09-28 | 合肥工业大学 | Method for mixing superfine powder and large-particle-diameter particles |
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