CN113816730A - Formula of electrothermal ceramic material, preparation method of electrothermal ceramic blank and heating element - Google Patents
Formula of electrothermal ceramic material, preparation method of electrothermal ceramic blank and heating element Download PDFInfo
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Abstract
The invention relates to a formula of an electrothermal ceramic material, which comprises silicon dioxide, aluminum oxide, lithium-containing industrial salt, zirconium oxide, technetium oxide and cobalt oxide, wherein the silicon dioxide accounts for 50-60 percent of the total weight of the electrothermal ceramic material; 20% -30% of alumina; 1% -25% of lithium-containing industrial salt; 1-8% of zirconium oxide; technetium oxide 0.2% -0.5%; 0.5 to 1 percent of cobalt oxide. The lithium-containing industrial salt of the electric heating ceramic material is mixed with a plurality of trace non-metallic oxides according to a proportion, so that the electric heating ceramic material which can be heated to 1000 ℃ at normal temperature only for ten seconds, is rapid in heating, uniform in heating, long in service life and low in cost and can save energy by 30% -50% is prepared, and the electric heating ceramic material has great significance for energy conservation and emission reduction in an electric heating market.
Description
Technical Field
The invention relates to a formula of an electrothermal ceramic material, a preparation method of an electrothermal ceramic blank and a heating piece.
Background
The heating sheet in the prior art uses a resistance wire as a heating device, the resistance wire generally adopts nickel-chromium alloy, the resistance value of the nickel-chromium alloy is low, the density is high, the thickness cannot be broken through, the electric heating conversion value is low, the heating rate is small, the heating element cannot realize constant temperature and power compensation functions, the electric heating system is complex in structure, the heat quality is low and the like, and the nickel-chromium alloy is ferrite alloy, so that the normal temperature, the medium temperature and the high temperature brittleness exist, and the electric heating conversion loss is too large.
Therefore, the formula of the electrothermal ceramic material and the preparation method of the electrothermal ceramic blank body adopting the formula replace the traditional heating piece such as a heating sheet, a high-temperature heating tube, a quartz tube and the like, have the beneficial effects of rapid temperature rise and low cost, and have great market prospect.
Disclosure of Invention
The first purpose of the invention is to provide a formula of an electrothermal ceramic material which has the advantages of quick heating, uniform heating and energy saving.
The second purpose of the invention is to provide a preparation method of the electrothermal ceramic blank body with quick heating, uniform heating and energy saving.
The third purpose of the invention is to provide a heating element which can generate heat quickly, generate heat uniformly and save energy.
The first object of the present invention is achieved by:
the formula of electrothermal ceramic material contains silicon dioxide, alumina, lithium-containing industrial salt, zirconium oxide, technetium oxide and cobalt oxide, and the above-mentioned materials are formed according to the weight proportion,
50% -60% of silicon dioxide;
20% -30% of alumina;
1% -25% of lithium-containing industrial salt;
1-8% of zirconium oxide;
technetium oxide 0.2% -0.5%;
0.5 to 1 percent of cobalt oxide.
The lithium-containing industrial salt of the electric heating ceramic material is mixed with a plurality of trace non-metallic oxides according to a proportion, so that the electric heating ceramic material which can be heated to 1000 ℃ at normal temperature only for ten seconds, is rapid in heating, uniform in heating, long in service life and low in cost and can save energy by 30% -50% is prepared, and the electric heating ceramic material has great significance for energy conservation and emission reduction in an electric heating market.
The first object of the present invention can also be solved by the following technical measures:
further, the lithium-containing industrial salt is lithium carbonate, lithium hydroxide, lithium oxide or lithium phosphate.
The second object of the present invention is achieved by:
a preparation method of an electric heating ceramic blank body comprises the following steps,
the method comprises the following steps: the material comprises, by weight, 56% of silicon dioxide, 24% of alumina, 17% of lithium-containing industrial salt, 2% of zirconia, 0.2% of technetium oxide and 0.8% of cobalt oxide;
step two: mixing the materials obtained in the first step, and then grinding the mixed materials for 24 hours by ball milling until the fineness reaches 400 meshes of screen residue;
step three: performing iron removal treatment on the material obtained in the step two, wherein the specified iron content is not higher than 0.01 percent of the total content;
step four: carrying out spraying, drying and granulating treatment on the material obtained in the step three to form particles with the size of 80 meshes and the water content of 5-7%;
step five: placing the particles obtained in the fourth step in a sealed container for ageing treatment for 48 hours;
step six: pressing the particles obtained in the step five into an electrothermal ceramic blank body with a required shape and thickness by using a powder hydraulic press;
step seven: placing the electrothermal ceramic blank body obtained in the step six in a baking furnace for baking, and drying at the set temperature of below 200 ℃ until the water content of the electrothermal ceramic blank body is less than 1%;
step eight: and placing the electrothermal ceramic blank body obtained in the step seven in a kiln with the temperature precision error not higher than 3 ℃, and firing the blank body at 1350 ℃ for 16 hours.
Through the steps, the electrothermal ceramic material can be mixed, ground, deironing, sprayed, dried, granulated, aged, pressed and dried to form the electrothermal ceramic blank body with the required shape and thickness, the electrothermal ceramic blank body has the advantages of only ten seconds for heating from normal temperature to 1000 ℃, rapid heating, uniform heating, long service life and low cost, and the energy conservation can reach 30-50 percent, thereby having great significance for the energy conservation and emission reduction of the electrothermal market.
The second object of the present invention can also be solved by the following technical measures:
further, the kiln adopts a roller kiln with small temperature precision error.
The third object of the present invention is achieved by:
the utility model provides a piece generates heat, includes conductive coating, the coating that generates heat, live wire terminal and zero line terminal, conductive coating sets up on an end face of electric heat ceramic idiosome, the coating that generates heat covers partly conductive coating, and partly conductive coating exposes outside the coating that generates heat, live wire terminal and zero line terminal set up respectively and connect conductive coating on electric heat ceramic idiosome.
The heating coating is sprayed on the microcrystal plate in the prior art, but the microcrystal plate has the defects in the aspects of heat conductivity and heat radiation, cannot be in a high-temperature and high-heat state for a long time, and cannot meet the user requirements, however, the electrothermal ceramic blank has the advantages of insulativity, heat conductivity, good heat gathering property and high temperature resistance, so that the heating coating is sprayed on the electrothermal ceramic blank, the processing is easy, a heating piece with high heat quality, high heat conductivity, high heat gathering property, high stability, long service life, quick heating effect and high heating temperature is formed, the heating temperature can even reach 400 degrees, the user requirements are met, the negative expansion values of the electrothermal ceramic blank and the heating coating are limited to be the same, the cracking or the breakage of the ceramic plate caused by the different expansion values of the ceramic plate and the heating coating are avoided, and the reliability of the heating plate is improved.
The third object of the present invention can also be solved by the following technical measures:
further, the heating coating is a graphene heating coating, and the thickness of the heating coating is in the range of 1um-10 um. The graphene is a new carbon material with a single-layer two-dimensional honeycomb lattice structure formed by tightly accumulating carbon atoms, the graphene has excellent electrical conductivity and outstanding heat conduction performance, the graphene is sprayed on an electrothermal ceramic blank in the prior art, but the electrothermal ceramic blank has the defects in the aspects of heat conductivity and heat dissipation, and cannot be in a high-temperature and high-heat state for a long time, and the user demand cannot be met, but the electrothermal ceramic blank has the advantages of insulativity, heat conductivity, good heat gathering performance and high temperature resistance, so that the graphene coating is sprayed on the electrothermal ceramic blank, the processing is easy, high heat quality is formed, high heat conduction, high heat gathering performance, high stability, long service life, quick heating effect, a heating piece with high heating temperature, and the heating temperature can even reach 400 degrees and can reach 1000 degrees, and the user demand is met.
Further, the width of the conductive coating is 6 mm.
And one end of the high-temperature-resistant conducting wire is welded on the corresponding live wire terminal or zero wire terminal exposed outside the hot coating, and the other end of the high-temperature-resistant conducting wire extends out of the through hole.
Further, still include the apron, the electric heat pottery idiosome is in the same place with the apron, and sealed glue has been paintd to the joint gap between electric heat pottery idiosome and the apron, and the pottery dustcoat shelters from graphite alkene heating coat and conductive coating, and the apron corresponds to open the through-hole that is convenient for the pencil to stretch out moreover.
Further, still include temperature sensor, temperature sensor's temperature measurement end supports and leans on graphite alkene heating coating, and temperature sensor's signal output line passes through the through-hole and stretches out outside the apron.
The invention has the following beneficial effects:
the lithium-containing industrial salt of the electric heating ceramic material is mixed with a plurality of trace non-metallic oxides according to a proportion, so that the electric heating ceramic material which can be heated to 1000 ℃ at normal temperature only for ten seconds, is rapid in heating, uniform in heating, long in service life and low in cost and can save energy by 30% -50% is prepared, and the electric heating ceramic material has great significance for energy conservation and emission reduction in an electric heating market.
Through the steps, the electrothermal ceramic material can be mixed, ground, deironing, sprayed, dried, granulated, aged, pressed and dried to form the electrothermal ceramic blank body with the required shape and thickness, the electrothermal ceramic blank body has the advantages of only ten seconds for heating from normal temperature to 1000 ℃, rapid heating, uniform heating, long service life and low cost, and the energy conservation can reach 30-50 percent, thereby having great significance for the energy conservation and emission reduction of the electrothermal market.
According to the invention, the heating coating is sprayed on the microcrystalline board for use in the prior art, but the microcrystalline board has the defects in the aspects of heat conductivity and heat dissipation, cannot be in a high-temperature and high-heat state for a long time, and cannot meet the user requirements, but the electrothermal ceramic blank has the advantages of insulativity, heat conductivity, good heat accumulation and high temperature resistance, so that the heating coating is sprayed on the electrothermal ceramic blank, the processing is easy, a heating piece with high heat quality, high heat conductivity, high heat accumulation, high stability, long service life, quick heating effect and high heating temperature is formed, the heating temperature can even reach 400 degrees and 1000 degrees, the user requirements are met, the negative expansion values of the electrothermal ceramic blank and the heating coating are limited to be the same, the cracking or the breakage of the ceramic plate caused by the different expansion values of the ceramic plate and the heating coating are avoided, and the reliability of the heating board is improved.
The graphene is a new carbon material with a single-layer two-dimensional honeycomb lattice structure formed by tightly accumulating carbon atoms, has excellent electrical conductivity and outstanding heat conduction performance, and is sprayed on an electrothermal ceramic blank in the prior art, but the electrothermal ceramic blank has the defects in the aspects of heat conductivity and heat dissipation, cannot be in a high-temperature and high-heat state for a long time and cannot meet the requirements of users, but the electrothermal ceramic blank has the advantages of insulativity, heat conductivity, good heat accumulation and high temperature resistance, so that a graphene coating is sprayed on the electrothermal ceramic blank, the processing is easy, a heating part with high heat quality, high heat conductivity, high heat accumulation, high stability, long service life, quick heating effect and high heating temperature is formed, and the heating temperature can even reach 400-plus-1000 ℃, thereby meeting the requirements of users.
Drawings
FIG. 1 is a schematic diagram of a formula of an electrothermal ceramic material.
FIG. 2 is a schematic diagram of a method for preparing an electrothermal ceramic green body.
Fig. 3 is a schematic view of the heat generating member (excluding the cover plate).
Fig. 4 is a schematic cross-sectional view of the heat generating member.
Detailed Description
The invention is further described with reference to the following figures and examples:
example, referring to fig. 1, a formula of an electrothermal ceramic material comprises silica, alumina, lithium-containing industrial salt, zirconia, technetium oxide and cobalt oxide, wherein the materials are prepared according to the weight ratio,
50% -60% of silicon dioxide;
20% -30% of alumina;
1% -25% of lithium-containing industrial salt;
1-8% of zirconium oxide;
technetium oxide 0.2% -0.5%;
0.5 to 1 percent of cobalt oxide.
Further, the lithium-containing industrial salt is lithium carbonate, lithium hydroxide, lithium oxide or lithium phosphate.
Example, referring to fig. 2, a method for preparing an electrothermal ceramic green body includes the following steps,
the method comprises the following steps: the material comprises, by weight, 56% of silicon dioxide, 24% of alumina, 17% of lithium-containing industrial salt, 2% of zirconia, 0.2% of technetium oxide and 0.8% of cobalt oxide;
step two: mixing the materials obtained in the first step, and then grinding the mixed materials for 24 hours by ball milling until the fineness reaches 400 meshes of screen residue;
step three: performing iron removal treatment on the material obtained in the step two, wherein the specified iron content is not higher than 0.01 percent of the total content;
step four: carrying out spraying, drying and granulating treatment on the material obtained in the step three to form particles with the size of 80 meshes and the water content of 5-7%;
step five: placing the particles obtained in the fourth step in a sealed container for ageing treatment for 48 hours;
step six: pressing the particles obtained in the step five into an electrothermal ceramic blank body with a required shape and thickness by using a powder hydraulic press;
step seven: placing the electrothermal ceramic blank body obtained in the step six in a baking furnace for baking, and drying at the set temperature of below 200 ℃ until the water content of the electrothermal ceramic blank body is less than 1%;
step eight: and placing the electrothermal ceramic blank body obtained in the step seven in a kiln with the temperature precision error not higher than 3 ℃, and firing the blank body at 1350 ℃ for 16 hours.
Further, the kiln adopts a roller kiln with small temperature precision error.
In an embodiment, referring to fig. 3, a heating element includes an electrothermal ceramic blank 1, a conductive coating 2, a heating coating 3, a live wire terminal 5, a zero line terminal 6, a high temperature resistant conductive wire 4, a temperature sensor 7, and a cover plate 8, where the conductive coating 2 is disposed on one end surface of the electrothermal ceramic blank 1, the conductive coating 2 is a silver coating, and the width of the conductive coating 2 is 6 mm.
The ceramic plate is also provided with at least one heating coating 3, the heating coating 3 is a graphene heating coating 3, the thickness of the graphene heating coating 3 is 5um, the graphene heating coating 3 covers a part of the conductive coating 2, a part of the conductive coating 2 is exposed out of the heating coating 3, the live wire terminal 5 is a high temperature resistant live wire terminal 5, the live wire terminal 5 is arranged on the electrothermal ceramic blank 1 and connected with the conductive coating 2, the zero line terminal 6 is a high temperature resistant zero line terminal 6, the zero line terminal 6 is arranged on the electrothermal ceramic blank 1 and connected with the conductive coating 2, the temperature resistance range of the high-temperature resistant conducting wire 4 is 0-1000 ℃, the high-temperature resistant conducting wire 4 is respectively welded on the corresponding live wire terminal 5 or zero line terminal 6, and the temperature measuring end of the temperature sensor 7 is abutted against the graphene heating coating.
Electric heat ceramic idiosome 1 and apron 8 are combined together, and sealed glue has been paintd to the joint gap between electric heat ceramic idiosome 1 and the apron 8, and the pottery dustcoat shelters from graphite alkene heating coating 3 and conductive coating 2, and apron 8 corresponds to opening the through-hole 81 that is convenient for the pencil to stretch out moreover. The high-temperature resistant conducting wire 4 penetrates through the through hole 81 and extends out of the cover plate 8, and a signal output line of the temperature sensor 7 penetrates through the through hole 81 and extends out of the cover plate 8.
The heating coating 3 is sprayed on the microcrystalline board in the prior art, but the microcrystalline board has the defects in the aspects of heat conductivity and heat dissipation, cannot be in a high-temperature and high-heat state for a long time, and cannot meet the requirements of users, however, the electrothermal ceramic blank 1 of the invention has the advantages of good insulativity, heat conductivity, heat accumulation and high temperature resistance, so that the heating coating 3 is sprayed on the electrothermal ceramic blank 1, the processing is easy, a heating member with high heat quality, high heat conductivity, high heat accumulation, high stability, long service life, quick heating effect and high heating temperature is formed, the heating temperature can even reach 400-, the reliability of the heating plate is improved.
The utility model discloses a ceramic plate, including graphite, graphite is the carbon new material that carbon atom is close to pile up into monolayer two-dimensional honeycomb lattice structure, graphite has excellent electric conductivity and outstanding heat conductivility, prior art is with graphite alkene spraying use on the micrite board, but the micrite board still has the shortcoming in the aspect of heat conductivity and thermal diffusivity, can't be in high temperature high heat state for a long time, can't satisfy user's demand, nevertheless electrothermal ceramic idiosome 1 have insulating nature, the heat conductivity, gather hot good and high temperature resistant advantage, consequently, with graphite alkene coating spraying on ceramic plate 1, the processing is easy, form the high heat quality, high heat conductivity, high heat gathers hot, high stability, long service life, the heating effect is fast, the high heating member of heating temperature, the heating temperature can reach 400 and add one's money 1000 degrees even, satisfy user's demand.
And the heating element is suitable for direct current and alternating current, 4V-380V voltage can be used, the heating element can be used in different scenes and under different conditions, the practicability of the heating element is greatly improved, the effect of the heating plate is tested, the pf9800 intelligent electric quantity measuring instrument can be used for measuring the current, the voltage, the power and the power factor of the heating plate, and the temperature measuring instrument can be used for synchronously measuring the temperature of the heating plate.
The heating piece can be used at high temperature for a long time, the heating piece cannot generate aging phenomenon at 0-1000 ℃, and the temperature can be increased to 800 ℃ within 3 seconds, so that the heating is rapid.
Moreover, the electric heating ceramic blank 1 is square, round or other shapes, so as to meet the requirements of different users, and the heating element can be arranged in the electric baking oven to form a heating source, thereby forming the electric oven with good energy-saving effect and good heating effect.
The above-mentioned solution is only one specific embodiment of the present invention, but the concept of the present invention is not limited thereto, and any practical modification or change to the present invention using the concept falls within the scope of the present invention, and thus different types of electrothermal ceramic materials containing lithium industrial salt fall within the scope of the present invention.
Claims (10)
1. The formula of the electrothermal ceramic material is characterized in that: comprises silicon dioxide, alumina, lithium-containing industrial salt, zirconia, technetium oxide and cobalt oxide, the materials are prepared according to the weight proportion,
50% -60% of silicon dioxide;
20% -30% of alumina;
1% -25% of lithium-containing industrial salt;
1-8% of zirconium oxide;
technetium oxide 0.2% -0.5%;
0.5 to 1 percent of cobalt oxide.
2. A formulation of an electrothermal ceramic material according to claim 1, wherein: the lithium-containing industrial salt is lithium carbonate, lithium oxide, lithium hydroxide or lithium phosphate.
3. A method for producing an electrothermal ceramic green body using the electrothermal ceramic material according to any one of claims 1 to 2, characterized in that: comprises the following steps of (a) carrying out,
the method comprises the following steps: the material comprises, by weight, 56% of silicon dioxide, 24% of alumina, 17% of lithium-containing industrial salt, 2% of zirconia, 0.2% of technetium oxide and 0.8% of cobalt oxide;
step two: mixing the materials obtained in the first step, and then grinding the mixed materials for 24 hours by ball milling until the fineness reaches 400 meshes of screen residue;
step three: performing iron removal treatment on the material obtained in the step two, wherein the specified iron content is not higher than 0.01 percent of the total content;
step four: carrying out spraying, drying and granulating treatment on the material obtained in the step three to form particles with the size of 80 meshes and the water content of 5-7%;
step five: placing the particles obtained in the fourth step in a sealed container for ageing treatment for 48 hours;
step six: pressing the particles obtained in the step five into an electrothermal ceramic blank body with a required shape and thickness by using a powder hydraulic press;
step seven: placing the electrothermal ceramic blank body obtained in the step six in a baking furnace for baking, and drying at the set temperature of below 200 ℃ until the water content of the electrothermal ceramic blank body is less than 1%;
step eight: and placing the electrothermal ceramic blank body obtained in the step seven in a kiln with the temperature precision error not higher than 3 ℃, and firing the blank body at 1350 ℃ for 16 hours.
4. A method for preparing an electrothermal ceramic green body according to claim 3, wherein: the kiln adopts a roller kiln with small temperature precision error.
5. A heat generating member using the electrothermal ceramic green body according to claim 3, wherein: including conductive coating, the coating that generates heat, live wire terminal and zero line terminal, conductive coating sets up on an terminal surface of electric heat ceramic idiosome, the coating that generates heat covers partly conductive coating, and partly conductive coating exposes outside the coating that generates heat, live wire terminal and zero line terminal set up respectively and connect conductive coating on electric heat ceramic idiosome.
6. The heat generating member according to claim 5, wherein: the heating coating is a graphene heating coating, and the thickness of the heating coating is in the range of 1um-10 um.
7. The heat generating member according to claim 5, wherein: the width of the conductive coating is 6 mm.
8. The heat generating member according to claim 5, wherein: the high-temperature-resistant electric wire is characterized by further comprising a high-temperature-resistant electric wire, one end of the high-temperature-resistant electric wire is welded on a corresponding live wire terminal or zero wire terminal exposed outside the hot coating, and the other end of the high-temperature-resistant electric wire extends out of the through hole.
9. The heat generating member according to claim 8, wherein: still include the apron, the electric heat ceramic idiosome is in the same place with the apron, and sealed glue has been paintd to the joint gap between electric heat ceramic idiosome and the apron, and the pottery dustcoat shelters from graphite alkene heating coating and conductive coating, and the apron corresponds to open the through-hole that is convenient for the pencil to stretch out moreover.
10. The heat generating member according to claim 9, wherein: still include temperature sensor, temperature sensor's temperature measurement end supports and leans on graphite alkene heating coating, and temperature sensor's signal output line passes the through-hole and stretches out outside the apron.
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| CN114380587A (en) * | 2022-01-19 | 2022-04-22 | 广州炻芯科技有限公司 | Formula of electrothermal ceramic material, preparation method of electrothermal ceramic blank and heating element |
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