CN104628368A - Ceramic utensil suitable for electromagnetic heating device - Google Patents
Ceramic utensil suitable for electromagnetic heating device Download PDFInfo
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- CN104628368A CN104628368A CN201510000313.1A CN201510000313A CN104628368A CN 104628368 A CN104628368 A CN 104628368A CN 201510000313 A CN201510000313 A CN 201510000313A CN 104628368 A CN104628368 A CN 104628368A
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Abstract
The invention provides a ceramic utensil suitable for an electromagnetic heating device. The ceramic utensil comprises a matrix material, wherein the matrix material mainly comprises spodumene, eucryptite, quartz, kaolin, zinc oxide, magnesium oxide and barium oxide. The ceramic material has a stable expansion coefficient within the range of 300 DEG C, is less liable to bursting when being heated and cooled repeatedly within the temperature range, and can be suitable for the electromagnetic heating device. The invention further discloses the ceramic utensil made of the ceramic material.
Description
Technical field
The present invention relates to can with based on the ceramic matrix of the metal based coating stable bond of silver-colored iron, its thermal expansivity and coating close, Heat stability is good.
Background technology
Iron silver mixture has good heat conduction magnetic conduction ability, may be used for electromagnetic heating apparatus.But the thermal expansion coefficient difference of itself and stupalith is comparatively large, and repeatedly rapid heat cycle, base coat comes off, and even bursts.
Inventor provide middle temperature heat-resistant ceramic and its preparation method, patent No. ZL200510035605.5.Disclosed in this case, the thermal expansivity of heat-stable ceramic is 2 ~ 3 × 10
-6/ DEG C.It comprises Quilonum Retard and the softening agent of silicon oxide 58% ~ 75%, aluminum oxide 18% ~ 35%, Lithium Oxide 98min 4.5% ~ 7.5% and trace.Chilling between resistance to 800 DEG C ~ 20 DEG C of the pottery that this case is thought under this ratio.
201210539801.6 open a kind of high heat-resisting ceramic and preparation method thereof, it is prepared from by the component of following weight content: petalite 44 ~ 46 parts, 12 ~ 13 parts, quartz, kaolin 14 ~ 15 parts, 6 ~ 7 parts, talcum, clay 22 ~ 28 parts, 3 ~ 4 parts, zinc oxide, 3 ~ 4 parts, barium oxide, waste porcelain slag 5 ~ 6 parts, niobium oxides 0.6 ~ 1.2 part, dispersion agent 0.25 ~ 0.4 part, polyacrylamide 0.4 ~ 0.5 part.This case also can maintain the heat exchange between 800 DEG C ~ 20 DEG C.In addition the kitchen tools heat-stable ceramic of 201010271915.8 also discloses the heat-stable ceramic formula of a kind of about 800 DEG C.
When electromagnetic heating apparatus uses pottery, if coating, the temperature of pottery itself generally remains on 50 to 300 DEG C, generally can not more than 400 DEG C.
200810107171.9 disclose a kind of heat resisting ceramic materials, and this pottery, except containing except conventional silicon oxide, aluminum oxide, Lithium Oxide 98min, calcium oxide, potassium oxide and sodium oxide, also contains ferric oxide, magnesium oxide and titanium oxide.The Lithium Oxide 98min of this case is lower, has the thermotolerance of 400 DEG C.
The high lithium-matrix heat resisting ceramic materials of 201110147816.3, is that combination of raw materials sintering forms primarily of petalite, magnificent woods soil, kaolin and useless porcelain powder, it is characterized in that the weight part of each raw material is: petalite 40 ~ 55 parts; Guizhou kaolin 12 ~ 20 parts; 20 ~ 30 parts, China's woods soil; Useless 5 ~ 10 parts, porcelain powder; Yichuan kaolin 6 ~ 8 parts; 6 ~ 8 parts, middle tall building soil; 2 ~ 4 parts, camphor tree state black earth; Talcum powder 2 ~ 4 parts; 2 ~ 4 parts, aluminum oxide; Silica powder 3 ~ 6 parts, the thermal stability of this heat resisting porcelain pot can reach and not split at 520 DEG C ~ 20 DEG C chillings.
For electromagnetic heating apparatus pottery except consider thermally-stabilised except, merit attention with the homogeneous thermal expansion of metal.The coating of this pottery is generally containing metal, especially silver-colored containing iron.The thermal expansivity of the metals such as iron, copper, silver generally maintains 10 ~ 20 × 10
-6/ DEG C about, be coated in thermal expansivity and be less than 3 ~ 8 × 10
-6/ DEG C about ceramic member on, repeatedly after heat exchange, coating easily comes off.
Pottery is based on metal oxide, and its coefficient of expansion is relevant to the ratio of oxide compound.201110060944.4 disclose magnesium oxide, silicon oxide, calcium oxide proportionlity on the impact of the coefficient of expansion.But because glass is totally different with the preparation technology of pottery, this ratio is not necessarily applicable to stupalith.
Pottery only exists and portion of techniques field with the balanced thermal expansion of metal, direct hybrid ceramic part and metal, needs to be got rid of.201010594254.2 preparation methods relating to a kind of magnetizable ceramic, it mixes magnetisable material in nonmagnetic ceramic powder, prepares magnetizable ceramic.This case explanation, the content of magnetisable material in magnetizable ceramic goods (5 ~ 80) wt%, in fact this ratio enumerates all magnetic ceramics goods, this scope all embodiments in, stupalith and magnetisable material all have good associativity and need to be investigated.
Therefore, prior art has the necessity improved further.
prior art is summarized
Inventor provide middle temperature heat-resistant ceramic and its preparation method, patent No. ZL200510035605.5.Disclosed in this case, the thermal expansivity of heat-stable ceramic is 2 ~ 3 × 10
-6/ DEG C.It comprises Quilonum Retard and the softening agent of silicon oxide 58% ~ 75%, aluminum oxide 18% ~ 35%, Lithium Oxide 98min 4.5% ~ 7.5% and trace.Chilling between resistance to 800 DEG C ~ 20 DEG C of the pottery that this case is thought under this ratio.
201210539801.6 open a kind of high heat-resisting ceramic and preparation method thereof, it is prepared from by the component of following weight content: petalite 44 ~ 46 parts, 12 ~ 13 parts, quartz, kaolin 14 ~ 15 parts, 6 ~ 7 parts, talcum, clay 22 ~ 28 parts, 3 ~ 4 parts, zinc oxide, 3 ~ 4 parts, barium oxide, waste porcelain slag 5 ~ 6 parts, niobium oxides 0.6 ~ 1.2 part, dispersion agent 0.25 ~ 0.4 part, polyacrylamide 0.4 ~ 0.5 part.This case also can maintain the heat exchange between 800 DEG C ~ 20 DEG C.In addition the kitchen tools heat-stable ceramic of 201010271915.8 also discloses the heat-stable ceramic formula of a kind of about 800 DEG C.
When electromagnetic heating apparatus uses pottery, if coating, the temperature of pottery itself generally remains on 50 to 300 DEG C, generally can not more than 400 DEG C.
200810107171.9 disclose a kind of heat resisting ceramic materials, and this pottery, except containing except conventional silicon oxide, aluminum oxide, Lithium Oxide 98min, calcium oxide, potassium oxide and sodium oxide, also contains ferric oxide, magnesium oxide and titanium oxide.The Lithium Oxide 98min of this case is lower, has the thermotolerance of 400 DEG C.
The high lithium-matrix heat resisting ceramic materials of 201110147816.3, is that combination of raw materials sintering forms primarily of petalite, magnificent woods soil, kaolin and useless porcelain powder, it is characterized in that the weight part of each raw material is: petalite 40 ~ 55 parts; Guizhou kaolin 12 ~ 20 parts; 20 ~ 30 parts, China's woods soil; Useless 5 ~ 10 parts, porcelain powder; Yichuan kaolin 6 ~ 8 parts; 6 ~ 8 parts, middle tall building soil; 2 ~ 4 parts, camphor tree state black earth; Talcum powder 2 ~ 4 parts; 2 ~ 4 parts, aluminum oxide; Silica powder 3 ~ 6 parts, the thermal stability of this heat resisting porcelain pot can reach and not split at 520 DEG C ~ 20 DEG C chillings.
For electromagnetic heating apparatus pottery except consider thermally-stabilised except, merit attention with the homogeneous thermal expansion of metal.The coating of this pottery is generally containing metal, especially silver-colored containing iron.The thermal expansivity of the metals such as iron, copper, silver generally maintains 10 ~ 20 × 10
-6/ DEG C about, be coated in thermal expansivity and be less than 3 ~ 8 × 10
-6/ DEG C about ceramic member on, repeatedly after heat exchange, coating easily comes off.
Pottery is based on metal oxide, and its coefficient of expansion is relevant to the ratio of oxide compound.201110060944.4 disclose magnesium oxide, silicon oxide, calcium oxide proportionlity on the impact of the coefficient of expansion.But because glass is totally different with the preparation technology of pottery, this ratio is not necessarily applicable to stupalith.
Pottery only exists and portion of techniques field with the balanced thermal expansion of metal, direct hybrid ceramic part and metal, needs to be got rid of.201010594254.2 preparation methods relating to a kind of magnetizable ceramic, it mixes magnetisable material in nonmagnetic ceramic powder, prepares magnetizable ceramic.This case explanation, the content of magnetisable material in magnetizable ceramic goods (5 ~ 80) wt%, in fact this ratio enumerates all magnetic ceramics goods, this scope all embodiments in, stupalith and magnetisable material all have good associativity and need to be investigated.
200910115840.1 disclose a kind of metal glaze layer, and this metal glaze layer is by the alloy composition of aluminium lithium silver titanium, and except the associativity of metal and stupalith, metal is as glaze layer, and wear resistance is suspectable.
201010172342.3 manufacture method disclosing porcelain pot for electromagnetic range, this porcelain pot for electromagnetic range comprises pot body and iron rete, and described pot body comprises 0.1-0.6 part Lithium Oxide 98min, 2-5 part aluminum oxide, 3-4.5 part silicon oxide and 0.3-0.5 part magnesium oxide.This pot of body has the advantages such as Heat stability is good, chance very hot oven and high temperature all not easily burst.This case describes the method preparing iron rete with hydrogen reduction method, but it is known that iron rete is used for electromagnetic stove.
201010219058.7 disclose a kind of electromagnetic induction ceramic cooker, comprise ceramic cooker body, metal level, protective layer.Metal level can be the one of ferronickel silver, and protective layer can be the glaze layer of silicon-dioxide.This case is thought by melting coating metal layer, can strengthen the associativity of metal level and ceramic body, and silicon-dioxide can reduce oxidation and the wearing and tearing of metal level.In addition, 200310103236.X, 200810073959.2,200710061691.6 and 201010160131.8 it is also proposed similar scheme, and the composition and the bonding way that are metal level have difference slightly.In fact, the difference of thermal expansion coefficients of metal simple-substance or metal alloy and existing ceramic principal constituent aluminum oxide, Lithium Oxide 98min is comparatively large, easily comes off or bursts.
200710100759.7 disclose a kind of ceramic cooking cook ware, and this cooker comprises ceramic body and compound coating, and compound coating is made up of radiation coating, heating coating and reflectance coating.Wherein radiation coating take transition metal oxide as main raw material, and heating coating is with argent iron-cobalt-nickel for main raw material, and reflecting layer take crystal whisker of hexa potassium titanate as main raw material.All additional in each coating is main solvent with bulk stock, and this solvent contributes to coated material for combining, and allows bulk expansion coefficient reach unanimity simultaneously.In this case, composite coated layer and solvent composition thereof can as the references of this case, although the object of its multiple coating improves thermo-efficiency.
Except coating metal layer, also there is the technical scheme of directly adding ferromagnetics material in stupalith.201010594254.2 preparation methods relating to a kind of magnetizable ceramic, it mixes magnetisable material in nonmagnetic ceramic powder, prepares magnetizable ceramic.This case explanation, the content of magnetisable material in magnetizable ceramic goods (5 ~ 80) wt%, in fact this ratio enumerates all magnetic ceramics goods, this scope all embodiments in, stupalith and magnetisable material all have good associativity and need to be investigated.This magnetisable substance classes that can be suitable for is various, relates to ferriferous oxide, iron-cobalt-nickel manganese alloy and relevant ore.According to embodiment, containing elements such as zinc strontium barium in ore, but the effect of zinc strontium barium in pottery is not open.
201210313966.1 disclose ferrite ceramic composition, said composition with copper ferrimanganic nickel zinc and oxide compound thereof for main raw material.This ceramic composition is mainly for the preparation of electronic devices and components, and they are different from considering with the ceramic member of electromagnetic heating apparatus of resistivity to electric conductivity.But this case points out metal and the combination stability of its oxide compound under electric heating state.
Present embodiment emphasis relates to the associated viscera of ceramic matrix of the present invention and pottery, the application's unaccomplished matter, can see other guide.Prior art has done detailed disclosed content, and the application does not repeat.To the understanding of prior art, the patent can quoted as proof with reference to background technology part and patent application.
Ceramic matrix of the present invention, is made up of triphane, eucryptite, lithium feldspar, quartz, kaolin, zinc oxide, magnesium oxide, barium oxide, Quilonum Retard, dispersion agent and softening agent.By accounting for ceramic body weight percent meter, zinc oxide 1% ~ 3%, magnesium oxide 7% ~ 8%, barium oxide 3% ~ 5%, Quilonum Retard 0.1 ~ 2%, dispersion agent 0.01 ~ 0.5%, softening agent 1%.Described triphane provides the Lithium Oxide 98min of 4% ~ 5%, and the silicon oxide that described triphane, quartz and kaolin provide the aluminum oxide of 22% ~ 25% altogether, content is 4.68 times, magnesium oxide, content are the calcium oxide of 1.2 times, magnesium oxide, and boron, potassium, sodium add up to and is less than 3%.
Main component of the present invention has drawn from lithium ore, kaolin and quartz etc., and in ore, each component concentration cannot accurately be estimated.In order to more accurately control the thermal expansivity of ceramic matrix, this ceramic matrix by aluminum oxide 22% ~ 23%, Lithium Oxide 98min 4 ~ 4.5%, silicon oxide 33% ~ 34%, calcium oxide 8% ~ 9%, zinc oxide 1%, magnesium oxide 7% ~ 7.5%, barium oxide 5%, Quilonum Retard 2%, dispersion agent 0.01 ~ 0.5%, softening agent 1%, the boron oxide of surplus, potassium oxide and sodium oxide composition.Described softening agent is carboxymethyl cellulose, and described dispersion agent is one or more in water glass, Sodium hexametaphosphate 99, Sodium salts humic acids.
The sintering processing of ceramic matrix is similar to existing heat-stable ceramic, first preheating, sinter again, taking-up of finally lowering the temperature.Sintering temperature is advisable to 1500 DEG C with 1300 DEG C.
Compound coating is made up of basic unit, heating layer and surface layer, and the particle of basic unit is large, and it is mainly principal constituent with common thermal glass, adds high expansion coefficient composition and the ferriferous oxides such as magnesium oxide.The thickness of basic unit is comparatively large, and it can connect ceramic matrix and metal.Main heating composition in heating layer is iron nickeline, and other compositions are mainly used in reducing and expand and flux, and the linear expansivity of heating layer material is not higher than 11 × 10
-6/ DEG C, be preferably 8 × 10
-6/ DEG C.Surface layer is except will considering expansion and heat-shock resistance, and wear-resisting and cracking resistance also will be considered.
The thermal expansivity of this ceramic matrix of the present invention is 6 ~ 8 × 10
-6/ DEG C, with the thermal expansivity of the mixture coating of metal and metal oxide close to 7 ~ 11 × 10
-6/ DEG C, body material and coating thermal expansivity close.In middle low temperature range (20 DEG C ~ 300 DEG C), thermal expansion is about 1.5 × 10
-3.
In order to more clearly understand the present invention, below provide multiple embodiment.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of ceramic matrix material being applicable to electromagnetic heating apparatus, and the thermal expansivity of itself and metal is close, thermally-stabilised in middle low temperature range (20 DEG C ~ 300 DEG C).
A kind of ceramic matrix with metal based coating stable bond, it is characterized in that, by accounting for ceramic matrix weight percent meter, zinc oxide 1% ~ 3%, Quilonum Retard 0.1 ~ 2%, magnesium oxide 7% ~ 8%, barium oxide 3% ~ 5%, triphane provides the Lithium Oxide 98min of 4% ~ 5%, the silicon oxide that triphane, quartz and kaolin provide the aluminum oxide of 25% ~ 32% altogether, content is 4.68 times, magnesium oxide, content are the calcium oxide of 1.2 times, magnesium oxide, and boron, potassium, sodium add up to and is less than 3%.
Preferably, this ceramic matrix by aluminum oxide 30% ~ 32%, Lithium Oxide 98min 4 ~ 4.5%, silicon oxide 33% ~ 34%, calcium oxide 8% ~ 9%, zinc oxide 1%, magnesium oxide 7% ~ 7.5%, barium oxide 5%, Quilonum Retard 2%, dispersion agent 0.01 ~ 0.5%, softening agent 1%, the boron oxide of surplus, potassium oxide and sodium oxide composition.
Preferably, the content of boron oxide is 0.1% ~ 2%.
Preferably, magnesium oxide is 7.21%.Magnesian content and silicon oxide, calcium oxide are proportional, and the content of controlled oxidization magnesium can the content of controlled oxidization silicon and calcium oxide simultaneously, to control the microcosmic composition of ceramic matrix.
With a preparation method for the ceramic matrix of metal based coating stable bond, it is characterized in that comprising the following steps:
By the recipe configuration triphane of ceramic matrix, petalite, quartz and kaolinic mixing raw material, selective flocculation, controls boron, potassium, sodium adds up to and be less than 3%, make stock after precipitation;
In stock, add zinc oxide, magnesium oxide, barium oxide and Quilonum Retard by the formula of ceramic matrix, make ceramic blank;
Pottery blank is placed in 800 DEG C ~ 900 DEG C pre-burnings 2 hours, and ceramic blank is placed in 1300 DEG C ~ 1500 DEG C pre-burnings 8 hours, is reduced to normal temperature gradually, makes ceramic matrix in 2 hours.
Be applicable to a pottery for electromagnetic heating apparatus, it is characterized in that being made up of ceramic matrix and compound coating, described ceramic matrix is made up of described stupalith, and described compound coating is made up of basic unit, heating layer and surface layer.
By weight percentage, described basic unit is by aluminum oxide 12% ~ 18%, calcium oxide 7% ~ 8%, magnesium oxide 7% ~ 8%, barium oxide 4% ~ 5%, ferric oxide 14% ~ 17%, boron oxide 12% ~ 14%, potassium oxide 2% ~ 5%, the silicon oxide composition of sodium oxide 0.1% ~ 4% and surplus, described heating layer is by aluminum oxide 12% ~ 18%, magnesium oxide 7% ~ 8%, iron and nickel totally 16% ~ 20%, silver 45% ~ 46%, boron oxide 5% ~ 6%, potassium oxide 2% ~ 5%, sodium oxide 0.1% ~ 2% forms, described surface layer is by aluminum oxide 21% ~ 26%, silicon oxide 28% ~ 40%, calcium oxide 7% ~ 8%, magnesium oxide 7% ~ 9%, ferric oxide 12% ~ 13%, zinc oxide 2% ~ 8%, potassium oxide 2% ~ 5%, sodium oxide 0.1% ~ 4% forms.
Be applicable to a preparation method for the pottery of electromagnetic heating apparatus, it is characterized in that comprising the following steps:
By the recipe configuration triphane of ceramic matrix, petalite, quartz and kaolinic mixing raw material, selective flocculation, controls boron, potassium, sodium adds up to and be less than 3%, make stock after precipitation;
In stock, add zinc oxide, magnesium oxide, barium oxide and Quilonum Retard by the formula of ceramic matrix, make ceramic blank;
Pottery blank is placed in 800 DEG C ~ 900 DEG C pre-burnings 2 hours, and ceramic blank is placed in 1300 DEG C ~ 1500 DEG C pre-burnings 8 hours, is reduced to normal temperature gradually, makes ceramic matrix in 2 hours;
Configure basic unit's raw material on request, crystallization after fusing, grinding, makes base layer dope, this base layer dope is coated on the ceramic matrix of sintering;
Configure heating layer raw material on request, get the rear crystallization of aluminum oxide, zinc oxide and fusing assistant fusing, grind after being mixed into iron based mixture and silver, make heating layer coating, by this heating layer paint in described basic unit;
Configure face stock on request, crystallization after fusing, grinding, makes investment precoat, this base layer dope is coated on described heating layer;
Dry, then sinter.
Embodiment
embodiment one
Get petalite, triphane, eucryptite, quartz and kaolin, be ground to 250 orders, after adding water, add polyacrylamide, Repeated Selective flocculates, controlled oxidization boron about 2%, sodium oxide and potassium oxide add up to about 4%, and other impurity adds up to about 1.5%, makes stock after precipitation.Approximately contain in stock, aluminum oxide 32%, Lithium Oxide 98min 4%, silicon oxide 32.76%, calcium oxide 8.4%.Get zinc oxide 1%, magnesium oxide 7%, barium oxide 5%, Quilonum Retard 2%, water glass 0.3%, carboxymethyl cellulose 1%, join in stock, add water and make matrix, matrix is made vessel-shaped, this matrix at least has smooth bottom surface.Pottery blank is placed in 800 DEG C of pre-burnings 2 hours, and ceramic blank is placed in 1310 DEG C of pre-burnings 8 hours, is reduced to normal temperature gradually, makes ceramic matrix in 2 hours.
Configure basic unit's raw material on request, described basic unit is made up of aluminum oxide 12%, calcium oxide 8%, magnesium oxide 11%, barium oxide 5%, ferric oxide 17%, boron oxide 14%, potassium oxide 2%, sodium oxide 1% and silicon oxide 30%.After each component fusing, 1200 DEG C of constant temperature crystallizatioies.Granularity 80 to 120 order after pulverizing, grinding, makes base layer dope.Add appropriate stand linseed oil and make slurry, adopt silk-screen printing technique this base layer dope to be coated on the ceramic matrix of sintering, print thickness 2.7mm to 5mm.
Configure heating layer raw material on request, described heating layer by aluminum oxide 18%, magnesium oxide 7%, iron and nickel totally 20%, silver-colored 45%, boron oxide 5%, potassium oxide 4%, sodium oxide 1% form.Get the rear crystallization of aluminum oxide, magnesium oxide and fusing assistant (boron oxide, potassium oxide and sodium oxide) fusing, grind after being mixed into iron based mixture and silver, make heating layer coating, add appropriate stand linseed oil and make slurry, adopt silk-screen printing technique by this heating layer paint in described basic unit.Require granularity 200 to 280 order after grinding, print thickness 1.5mm to 3mm.
Configure face stock on request, described surface layer is made up of aluminum oxide 26%, silicon oxide 40%, calcium oxide 7%, magnesium oxide 7%, ferric oxide 12%, zinc oxide 2%, potassium oxide 5%, sodium oxide 1%.Crystallization after each component fusing, grinding, makes investment precoat, adds appropriate stand linseed oil and make slurry, adopts silk-screen printing technique that this surface layer coating is coated on described heating layer.Require granularity 200 to 280 order after grinding, print thickness 1.5mm to 3mm.
120 DEG C of oven dry, sinter through 900 DEG C again, make pottery.
embodiment two
Ceramic matrix by aluminum oxide 32%, Lithium Oxide 98min 4.5%, silicon oxide 33.7428%, calcium oxide 8.652%, zinc oxide 1%, magnesium oxide 7.21%, barium oxide 5%, Quilonum Retard 0.1%, dispersion agent 0.5%, softening agent 1%, the boron oxide of surplus, potassium oxide and sodium oxide composition.In the present embodiment, magnesium oxide is optimum content.A small amount of magnesium oxide is arranged in the crystal of calcium oxide and silicon oxide, can improve thermal expansivity, and strengthen heat-shock resistance.
embodiment three
Ceramic matrix by aluminum oxide 30%, Lithium Oxide 98min 4%, silicon oxide 37.44%, calcium oxide 9.6%, zinc oxide 1%, magnesium oxide 8%, barium oxide 3%, dispersion agent 0.5%, softening agent 1%, the boron oxide of surplus, potassium oxide and sodium oxide composition.In the present embodiment, the content of Quilonum Retard is zero, and lithium can play and flux by force, reduces sintering temperature simultaneously, but the existence of lithium is disadvantageous to cost.
embodiment four
Ceramic matrix by aluminum oxide 32%, Lithium Oxide 98min 4.5%, silicon oxide 37.44%, calcium oxide 9.6%, zinc oxide 1%, magnesium oxide 8%, barium oxide 3%, dispersion agent 0.5%, softening agent 1%, Quilonum Retard 2%, the boron oxide of surplus, potassium oxide and sodium oxide composition.Boron oxide, potassium oxide and sodium oxide are composition of fluxing, but can reduce thermal expansivity fast.
embodiment five
Described basic unit is made up of aluminum oxide 18%, silicon oxide 30.8%, calcium oxide 8%, magnesium oxide 7.2%, barium oxide 4%, ferric oxide 14%, boron oxide 12%, potassium oxide 2%, sodium oxide 4%.Aluminum oxide is too much, and intensity is large but coating easily comes off.Silicon oxide, calcium oxide and magnesium oxide can melt altogether, quick crystallization.The combination of the metals such as transition metal oxide and iron nickeline is stable.Explosion after small amounts barium can prevent Rapid Thermal from exchanging.Flux composition based on boron oxide.
embodiment six
Described heating layer is by aluminum oxide 12%, magnesium oxide 8%, iron-nickel alloy (Ni
3fe) 12%, iron 13%, silver 46%, boron oxide 6%, potassium oxide 2%, sodium oxide 1% form.The effect mainly magnetic conduction conduction of iron nickel, silver can reduce resistance, prevents high temperature oxidation simultaneously.
embodiment seven
Described surface layer is made up of aluminum oxide 26%, silicon oxide 32%, calcium oxide 8%, magnesium oxide 7%, ferric oxide 13%, zinc oxide 8%, potassium oxide 2%, sodium oxide 4%.A small amount of magnesium oxide can increase wear resistance in calcium oxide and silicon oxide, and ferric oxide contributes to the connection of surface layer and heating layer and keeps thermally-stabilised.Flux composition based on potassium sodium.
Claims (4)
1. one kind is applicable to the pottery of electromagnetic heating apparatus, it is characterized in that being made up of ceramic matrix and compound coating, described ceramic matrix is made up of described stupalith, described compound coating is by basic unit, heating layer and surface layer composition, wherein, described ceramic matrix is by accounting for ceramic matrix weight percent meter, zinc oxide 1% ~ 3%, Quilonum Retard 0.1 ~ 2%, magnesium oxide 7% ~ 8%, barium oxide 3% ~ 5%, triphane provides the Lithium Oxide 98min of 4% ~ 5%, triphane, quartz and kaolin provide the aluminum oxide of 25% ~ 32% altogether, content is the silicon oxide of 4.68 times, magnesium oxide, content is the calcium oxide of 1.2 times, magnesium oxide, boron, potassium, sodium adds up to and is less than 3%.
2. pottery according to claim 1, it is characterized in that, this ceramic matrix by aluminum oxide 30% ~ 32%, Lithium Oxide 98min 4 ~ 4.5%, silicon oxide 33% ~ 34%, calcium oxide 8% ~ 9%, zinc oxide 1%, magnesium oxide 7% ~ 7.5%, barium oxide 5%, Quilonum Retard 2%, dispersion agent 0.01 ~ 0.5%, softening agent 1%, the boron oxide of surplus, potassium oxide and sodium oxide composition.
3. pottery according to claim 1, is characterized in that, the content of boron oxide is 0.1% ~ 2%.
4. pottery according to claim 1, is characterized in that, magnesium oxide is 7.21%.
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|---|---|---|---|
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| CN110526675A (en) * | 2018-05-23 | 2019-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Ceramic composition, ceramic material and ceramic pan |
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