CN106187187B - Ceramic preparation method, ceramic and basalt wire drawing bushing plate - Google Patents
Ceramic preparation method, ceramic and basalt wire drawing bushing plate Download PDFInfo
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Abstract
The invention relates to a ceramic preparation method, ceramic and a basalt wire drawing bushing plate. The preparation method of the ceramic comprises the following steps: respectively preparing lanthanum chromate, zirconium oxide/yttrium oxide and additive powder; preparing the prepared lanthanum chromate and the powder of the additive into a first ceramic green sheet; forming a composite layer on the prepared first ceramic green sheet, wherein the composite layer comprises zirconia/yttria; and carrying out hot-pressing sintering molding on the first ceramic green plate and the composite layer. The porosity of the ceramic prepared by the ceramic preparation method can be controlled within 20 percent. The ceramic has uniform texture and better high-temperature resistance and conductivity; the ceramic has high strength, good bending resistance and fracture resistance, and can bear certain load. Therefore, the ceramic preparation process can be used for manufacturing special process equipment, such as a bottom plate for manufacturing a basalt bushing plate, and replaces the traditional bottom plate made of platinum-rhodium alloy, so that the production cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of material manufacturing, in particular to a ceramic preparation method, ceramic and a basalt wire drawing bushing.
Background
In the prior art, for example, basalt fiber manufacturing, has very high requirements for high temperature resistance, conductivity and strength of production equipment.
During the process of drawing basalt high-temperature solution, the bushing needs to operate at very high temperature, even up to 1200-1300 ℃, which requires the bushing to have good high-temperature resistance during the working process.
On the other hand, because the basalt has high melting temperature, high viscosity and easy crystallization, the wire drawing temperature is difficult to control, and the bottom plate of the wire drawing bushing needs to be simultaneously and electrically heated to ensure the temperature of the basalt melt in the wire drawing process, so that the bottom plate of the wire drawing bushing is required to have good electrical conductivity.
And the basalt melt flows out through a nozzle on a bottom plate of the bushing, the melt is drawn into basalt continuous fibers below the bottom plate through a wire drawing machine, and the basalt melt has high viscosity, so that the bottom plate needs to bear extremely high tensile force, and the bottom plate is required to have high strength and good bending resistance and fracture resistance.
In view of this, the bottom plate of the basalt fiber bushing floor slab in the prior art is often manufactured by platinum rhodium alloy, so as to meet the extremely high performance requirement of the basalt fiber manufacturing process on the bottom plate of the bushing. However, such bushing plates are extremely expensive to manufacture. Meanwhile, the ceramic bushing manufactured by the existing process cannot meet the extremely high requirements of the bottom plate of the wire drawing bushing on high temperature resistance, conductivity and strength.
Disclosure of Invention
In view of the above, the present invention is directed to a method for preparing a ceramic capable of producing a ceramic having excellent properties such as high temperature resistance, electrical conductivity and strength.
Another object of the present invention is to provide a ceramic capable of having an extremely high temperature resistance, electrical conductivity and strength.
The invention also aims to provide the basalt wire drawing bushing capable of effectively reducing the manufacturing cost.
According to a first aspect of the present invention, there is provided a method of preparing a ceramic, comprising the steps of:
respectively preparing lanthanum chromate, zirconium oxide/yttrium oxide and additive powder;
preparing the prepared lanthanum chromate and the powder of the additive into a first ceramic green sheet;
forming a composite layer on the prepared first ceramic green sheet, wherein the composite layer comprises zirconia/yttria;
and carrying out hot-pressing sintering molding on the first ceramic green plate and the composite layer.
Preferably, the composite layer further comprises an additive.
Preferably, the preparation of the first ceramic green sheet comprises the steps of:
uniformly mixing the prepared lanthanum chromate and the powder of the additive according to a certain proportion;
drying the uniformly mixed powder;
and pressing the dried powder to generate a first ceramic green plate.
Preferably, the step of forming a composite layer on the prepared first ceramic green sheet includes:
drying the zirconia/yttria powder;
pressing the prepared zirconia/yttria powder to form a second ceramic green sheet, or disposing the prepared zirconia/yttria powder on the first ceramic green sheet.
Preferably, the additive comprises a plurality of metallic elements.
Preferably, the metal element includes at least two of strontium, barium, titanium, yttrium, cerium, and scandium.
Preferably, the plurality of metal elements are present in the form of respective oxides.
Preferably, the step of separately preparing powders of lanthanum chromate, zirconia/yttria and additive comprises:
the lanthanum chromate, the zirconia/yttria and the additive are crushed continuously in a ball mill to form superfine powder.
Preferably, the particle diameter of the ultrafine powder is 1 to 3 μm.
Preferably, the lanthanum chromate, the additive and the zirconia/yttria powder are added in parts by weight of 84-87 parts of lanthanum chromate powder, 0.5-1 part of additive and 9-11 parts of zirconia/yttria powder in the process of preparing the ceramic green sheet and forming the composite layer.
Preferably, the step of drying the prepared powder comprises:
and keeping the temperature of 230-270 ℃, and continuously drying the uniformly mixed powder for 8-12 hours.
Preferably, the step of hot-pressing sintering and forming the first ceramic green sheet and the composite layer comprises:
and pressurizing and sintering the first ceramic green plate and the composite layer in a forming die, wherein the pressurizing process is divided into a plurality of stages, and the pressurizing pressure is released after the pressurizing is carried out for a period of time, so that the workpiece to be machined is pressurized again after the stress is released.
Preferably, the sintering temperature of the powder is 1100-.
Preferably, the purity of the lanthanum chromate, zirconia/yttria and additive is 99.80-99.99%.
According to a second aspect of the present invention, there is provided a ceramic produced by the ceramic production method.
According to a third aspect of the invention, a basalt bushing plate is provided, and a bottom plate of the basalt bushing plate is manufactured by adopting the ceramic preparation method.
The porosity of the ceramic prepared by the ceramic preparation method can be controlled within 20 percent. The ceramic has uniform texture, is not easy to crack, has better high temperature resistance and electrical conductivity, and can be used even at the temperature of 1400 ℃; on the other hand, the ceramic prepared by the ceramic preparation method has higher strength and good bending resistance and fracture resistance, and can bear a certain load. Therefore, the ceramic preparation process can be used for manufacturing special process equipment, such as a bottom plate for manufacturing a basalt bushing plate, and replaces a traditional bottom plate made of platinum-rhodium alloy, so that the production cost is greatly reduced while the good service performance is ensured.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a flow chart of the steps of a method of making a ceramic according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating steps for preparing a first ceramic green sheet according to an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
FIG. 1 illustrates steps of a method of making a ceramic according to an embodiment of the present invention. The method for preparing the ceramic will be described in detail with reference to several examples.
The first embodiment is as follows:
s1), preparing lanthanum chromate, zirconium oxide or yttrium oxide, respectively, and powders of the additive.
In the step, firstly, various high-purity raw materials including lanthanum chromate, zirconium oxide or yttrium oxide and additives are selected, and the purity of the raw materials is required to be more than or equal to 98 percent, and the raw materials are preferably 99.80-99.99 percent so as to strictly control the component proportion;
then, putting the lanthanum chromate, the zirconia or the yttria and various components of the additive into a ball mill respectively, and continuously crushing to prepare ultrafine powder. Preferably, the ultrafine powder has a particle diameter of 5 to 25 μm, more preferably 1 to 3 μm, so that the texture of the resulting ceramic is more uniform.
S2), the prepared lanthanum chromate and the powder of the additive are made into a first ceramic green sheet.
Referring to fig. 2, in this step, the following specific steps are included again:
a) doping and uniformly mixing the lanthanum chromate prepared in the step S1) and the additive powder according to the parts by weight of 84 parts of lanthanum chromate powder and 0.5 part of additive powder, wherein the proportioning relation among the components of the additive is added according to actual needs;
b) continuously drying the uniformly mixed powder for 8 hours at the temperature of 230 ℃ to remove water in the powder and ensure the strict component proportion;
c) and pre-pressing the dried powder to generate the ceramic green plate.
S3), forming a composite layer on the prepared first ceramic green sheet, wherein the composite layer comprises any one of zirconium oxide and yttrium oxide, and the weight part of zirconium oxide or yttrium oxide powder corresponding to the lanthanum chromate powder and the additive powder is 9 parts.
In this step, the zirconia/yttria powder is dried. Then, one scheme is to pre-press the prepared zirconia or yttria powder to generate a second ceramic green sheet, and to place the first ceramic green sheet prepared in step S2) into a forming mold, and then to stack the second ceramic green sheet on the first ceramic green sheet; the other scheme is that the first ceramic green plate is placed into a forming die, and then the prepared zirconium oxide or yttrium oxide powder is directly arranged on the first ceramic green plate to form a corresponding powder layer.
It should be understood by those skilled in the art that the raw material of the composite layer may also be a mixture of zirconia or yttria and an additive, and the corresponding specific process flow is the same as the principle of the first ceramic green sheet, and will not be described herein again.
S4), hot-pressing and sintering the first ceramic green plate and the composite layer at the high temperature of 1100 ℃.
In this step, the whole forming mold with the first ceramic green sheet and the composite layer is placed in a sintering furnace, for example, a closed intermediate frequency induction hot pressing sintering furnace, and sintering is performed while pressurizing, wherein the pressurizing process is performed in multiple stages, for example, seven or eight times of pressurizing may be performed as required; and releasing the pressurizing pressure after pressurizing for a period of time, so that the workpiece to be machined is pressurized again after releasing the stress, and the phenomenon that the workpiece to be machined is cracked due to the fact that the stress of the workpiece to be machined is not released in time due to continuous pressurization is avoided.
In one embodiment, before the dried powder is subjected to hot-press sintering, the dried powder may be first granulated and then subjected to hot-press sintering molding after the prepared granules are placed in a molding die.
Example two:
s1), preparing lanthanum chromate, zirconium oxide or yttrium oxide, respectively, and powders of the additive.
In the step, firstly, various high-purity raw materials including lanthanum chromate, zirconium oxide or yttrium oxide and additives are selected, and the purity of the raw materials is required to be more than or equal to 98 percent, and the raw materials are preferably 99.80-99.99 percent so as to strictly control the component proportion;
then, putting the lanthanum chromate, the zirconia or the yttria and various components of the additive into a ball mill respectively, and continuously crushing to prepare ultrafine powder. Preferably, the ultrafine powder has a particle diameter of 5 to 25 μm, more preferably 1 to 3 μm, so that the texture of the resulting ceramic is more uniform.
S2), the prepared lanthanum chromate and the powder of the additive are made into a first ceramic green sheet.
Referring to fig. 2, in this step, the following specific steps are included again:
a) doping and uniformly mixing the lanthanum chromate prepared in the step S1) and the additive powder according to the parts by weight of 85 parts of lanthanum chromate powder and 0.75 part of additive powder, wherein the proportioning relation among the components of the additive is added according to actual needs;
b) continuously drying the uniformly mixed powder for 9 hours at the temperature of 240 ℃ to remove the water in the powder and ensure the strict component proportion;
c) and pre-pressing the dried powder to generate the ceramic green plate.
S3), forming a composite layer on the prepared first ceramic green sheet, wherein the composite layer comprises any one of zirconium oxide and yttrium oxide, and the weight parts of the zirconium oxide or yttrium oxide powder corresponding to the lanthanum chromate powder and the additive powder are 10 parts.
In this step, the zirconia/yttria powder is dried. Then, one scheme is to pre-press the prepared zirconia or yttria powder to generate a second ceramic green sheet, and to place the first ceramic green sheet prepared in step S2) into a forming mold, and then to stack the second ceramic green sheet on the first ceramic green sheet; the other scheme is that the first ceramic green plate is placed into a forming die, and then the prepared zirconium oxide or yttrium oxide powder is directly arranged on the first ceramic green plate to form a corresponding powder layer.
It should be understood by those skilled in the art that the raw material of the composite layer may also be a mixture of zirconia or yttria and an additive, and the corresponding specific process flow is the same as the principle of the first ceramic green sheet, and will not be described herein again.
S4), hot-pressing and sintering the first ceramic green plate and the composite layer at a high temperature of 1200 ℃.
In this step, the whole forming mold with the first ceramic green sheet and the composite layer is placed in a sintering furnace, for example, a closed intermediate frequency induction hot pressing sintering furnace, and sintering is performed while pressurizing, wherein the pressurizing process is performed in multiple stages, for example, seven or eight times of pressurizing may be performed as required; and releasing the pressurizing pressure after pressurizing for a period of time, so that the workpiece to be machined is pressurized again after releasing the stress, and the phenomenon that the workpiece to be machined is cracked due to the fact that the stress of the workpiece to be machined is not released in time due to continuous pressurization is avoided.
In one embodiment, before the dried powder is subjected to hot-press sintering, the dried powder may be first granulated and then subjected to hot-press sintering molding after the prepared granules are placed in a molding die.
Example three:
s1), preparing lanthanum chromate, zirconium oxide or yttrium oxide, respectively, and powders of the additive.
In the step, firstly, various high-purity raw materials including lanthanum chromate, zirconium oxide or yttrium oxide and additives are selected, and the purity of the raw materials is required to be more than or equal to 98 percent, and the raw materials are preferably 99.80-99.99 percent so as to strictly control the component proportion;
then, putting the lanthanum chromate, the zirconia or the yttria and various components of the additive into a ball mill respectively, and continuously crushing to prepare ultrafine powder. Preferably, the ultrafine powder has a particle diameter of 5 to 25 μm, more preferably 1 to 3 μm, so that the texture of the resulting ceramic is more uniform.
S2), the prepared lanthanum chromate and the powder of the additive are made into a first ceramic green sheet.
Referring to fig. 2, in this step, the following specific steps are included again:
a) doping and uniformly mixing the lanthanum chromate prepared in the step S1) and the additive powder according to the parts by weight of 86 parts of lanthanum chromate powder and 0.9 part of additive powder, wherein the proportioning relation among the components of the additive is added according to actual needs;
b) continuously drying the uniformly mixed powder for 10 hours at the temperature of 250 ℃ to remove water in the powder and ensure the strict component proportion;
c) and pre-pressing the dried powder to generate the ceramic green plate.
S3), forming a composite layer on the prepared first ceramic green sheet, wherein the composite layer comprises any one of zirconium oxide and yttrium oxide, and the weight part of zirconium oxide or yttrium oxide powder corresponding to the lanthanum chromate powder and the additive powder is 11 parts.
In this step, the zirconia/yttria powder is dried. Then, one scheme is to pre-press the prepared zirconia or yttria powder to generate a second ceramic green sheet, and to place the first ceramic green sheet prepared in step S2) into a forming mold, and then to stack the second ceramic green sheet on the first ceramic green sheet; the other scheme is that the first ceramic green plate is placed into a forming die, and then the prepared zirconium oxide or yttrium oxide powder is directly arranged on the first ceramic green plate to form a corresponding powder layer.
It should be understood by those skilled in the art that the raw material of the composite layer may also be a mixture of zirconia or yttria and an additive, and the corresponding specific process flow is the same as the principle of the first ceramic green sheet, and will not be described herein again.
S4), hot-pressing and sintering the first ceramic green plate and the composite layer at the high temperature of 1300 ℃.
In this step, the whole forming mold with the first ceramic green sheet and the composite layer is placed in a sintering furnace, for example, a closed intermediate frequency induction hot pressing sintering furnace, and sintering is performed while pressurizing, wherein the pressurizing process is performed in multiple stages, for example, seven or eight times of pressurizing may be performed as required; and releasing the pressurizing pressure after pressurizing for a period of time, so that the workpiece to be machined is pressurized again after releasing the stress, and the phenomenon that the workpiece to be machined is cracked due to the fact that the stress of the workpiece to be machined is not released in time due to continuous pressurization is avoided.
In one embodiment, before the dried powder is subjected to hot-press sintering, the dried powder may be first granulated and then subjected to hot-press sintering molding after the prepared granules are placed in a molding die.
Example four:
s1), preparing lanthanum chromate, zirconium oxide or yttrium oxide, respectively, and powders of the additive.
In the step, firstly, various high-purity raw materials including lanthanum chromate, zirconium oxide or yttrium oxide and additives are selected, and the purity of the raw materials is required to be more than or equal to 98 percent, and the raw materials are preferably 99.80-99.99 percent so as to strictly control the component proportion;
then, putting the lanthanum chromate, the zirconia or the yttria and various components of the additive into a ball mill respectively, and continuously crushing to prepare ultrafine powder. Preferably, the ultrafine powder has a particle diameter of 5 to 25 μm, more preferably 1 to 3 μm, so that the texture of the resulting ceramic is more uniform.
S2), the prepared lanthanum chromate and the powder of the additive are made into a first ceramic green sheet.
Referring to fig. 2, in this step, the following specific steps are included again:
a) doping and uniformly mixing the lanthanum chromate prepared in the step S1) and the additive powder according to the parts by weight of 87 parts of lanthanum chromate powder and 0.9 part of additive powder, wherein the proportioning relation among the components of the additive is added according to actual needs;
b) continuously drying the uniformly mixed powder for 11 hours at the temperature of 250 ℃ to remove water in the powder and ensure the strict component proportion;
c) and pre-pressing the dried powder to generate the ceramic green plate.
S3), forming a composite layer on the prepared first ceramic green sheet, wherein the composite layer comprises any one of zirconium oxide and yttrium oxide, and the weight part of zirconium oxide or yttrium oxide powder corresponding to the lanthanum chromate powder and the additive powder is 11 parts.
In this step, the zirconia/yttria powder is dried. Then, one scheme is to pre-press the prepared zirconia or yttria powder to generate a second ceramic green sheet, and to place the first ceramic green sheet prepared in step S2) into a forming mold, and then to stack the second ceramic green sheet on the first ceramic green sheet; the other scheme is that the first ceramic green plate is placed into a forming die, and then the prepared zirconium oxide or yttrium oxide powder is directly arranged on the first ceramic green plate to form a corresponding powder layer.
It should be understood by those skilled in the art that the raw material of the composite layer may also be a mixture of zirconia or yttria and an additive, and the corresponding specific process flow is the same as the principle of the first ceramic green sheet, and will not be described herein again.
S4), hot-pressing and sintering the first ceramic green plate and the composite layer at a high temperature of 1400 ℃.
In this step, the whole forming mold with the first ceramic green sheet and the composite layer is placed in a sintering furnace, for example, a closed intermediate frequency induction hot pressing sintering furnace, and sintering is performed while pressurizing, wherein the pressurizing process is performed in multiple stages, for example, seven or eight times of pressurizing may be performed as required; and releasing the pressurizing pressure after pressurizing for a period of time, so that the workpiece to be machined is pressurized again after releasing the stress, and the phenomenon that the workpiece to be machined is cracked due to the fact that the stress of the workpiece to be machined is not released in time due to continuous pressurization is avoided.
In one embodiment, before the dried powder is subjected to hot-press sintering, the dried powder may be first granulated and then subjected to hot-press sintering molding after the prepared granules are placed in a molding die.
In the above-mentioned first to fourth embodiments, the additive includes a plurality of metal elements, for example, at least two of strontium, barium, titanium, yttrium, cerium, and scandium. The plurality of metal elements are present in the form of respective oxides, such as strontium oxide, barium monoxide, titanium dioxide, yttrium oxide, cerium oxide, and discandium trioxide. The additive can increase the high-temperature thermal stability and the electrical conductivity of the ceramic, and can also play a role in refining grains.
The porosity of the ceramic prepared by the ceramic preparation method can be controlled within 20 percent. The ceramic has uniform texture, is not easy to crack, has better high temperature resistance and electrical conductivity, and can be used even at the temperature of 1400 ℃; on the other hand, the ceramic prepared by the ceramic preparation method has higher strength and good bending resistance and fracture resistance, and can bear a certain load. Therefore, the ceramic preparation process can be used for manufacturing special process equipment, such as a bottom plate for manufacturing a basalt bushing plate, and replaces a traditional bottom plate made of platinum-rhodium alloy, so that the production cost is greatly reduced while the good service performance is ensured.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (9)
1. A method for preparing ceramics is characterized by comprising the following steps:
respectively preparing superfine powder of lanthanum chromate, zirconium oxide/yttrium oxide and an additive, wherein the particle diameter of the superfine powder is 1-3 mu m;
pressing the prepared powder of the lanthanum chromate and the additive into a first ceramic green sheet;
forming a composite layer on the prepared first ceramic green sheet, wherein the composite layer comprises zirconia/yttria;
the first ceramic green plate and the composite layer are subjected to hot-pressing sintering molding, the sintering temperature of the powder of the first ceramic green plate and the composite layer is 1100-1400 ℃,
the additive comprises oxides of a plurality of metal elements including at least two of strontium, barium, titanium, yttrium, cerium and scandium,
in the process of preparing the ceramic green plate and forming the composite layer, the lanthanum chromate, the additive and the zirconium oxide/yttrium oxide powder are added according to the parts by weight of 84-87 parts of lanthanum chromate powder, 0.5-1 part of additive and 9-11 parts of zirconium oxide/yttrium oxide powder.
2. The method of claim 1, further comprising, between the steps of pressing into the first ceramic green sheet:
uniformly mixing the prepared lanthanum chromate and the powder of the additive according to a certain proportion;
and drying the uniformly mixed powder.
3. The method of preparing ceramic according to claim 1, wherein the step of forming a composite layer on the prepared first ceramic green sheet comprises:
drying the zirconia/yttria powder;
pressing the prepared zirconia/yttria powder to form a second ceramic green sheet, or disposing the prepared zirconia/yttria powder on the first ceramic green sheet.
4. The method for preparing ceramic according to claim 1, wherein the step of separately preparing ultrafine powders of lanthanum chromate, zirconia/yttria and additive comprises:
the lanthanum chromate, the zirconia/yttria and the additive are crushed continuously in a ball mill to form superfine powder.
5. The method of claim 2, wherein the step of drying the prepared powder comprises:
and keeping the temperature of 230-270 ℃, and continuously drying the uniformly mixed powder for 8-12 hours.
6. The method of claim 1, wherein the step of hot press sintering the first ceramic green sheet and the composite layer to form a shape comprises:
and pressurizing and sintering the first ceramic green plate and the composite layer in a forming die, wherein the pressurizing process is divided into a plurality of stages, and the pressurizing pressure is released after the pressurizing is carried out for a period of time, so that the workpiece to be machined is pressurized again after the stress is released.
7. A method of preparing a ceramic according to claim 6 wherein the purity of the lanthanum chromate, zirconia/yttria and additives is 99.80-99.99%.
8. A ceramic produced by the method for producing a ceramic according to any one of claims 1 to 7.
9. A basalt bushing, wherein the bottom plate of the basalt bushing is manufactured by the ceramic manufacturing method of any one of claims 1 to 7.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153446A (en) * | 1995-12-29 | 1997-07-02 | 黄安荣 | Electrothermal lanthanum chromate body and its mfg. method |
| CN101481252A (en) * | 2009-02-10 | 2009-07-15 | 山东大学 | Rare earth perovskite type fire-resistant material |
| CN104829227A (en) * | 2015-04-24 | 2015-08-12 | 河南科技大学 | Zirconia-zirconium boride double-layer composite ceramic heating element and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3145568B2 (en) * | 1994-05-31 | 2001-03-12 | 京セラ株式会社 | Ceramic heating element |
| JPH11106261A (en) * | 1997-09-30 | 1999-04-20 | Kyocera Corp | Ceramic heater element |
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- 2016-06-30 CN CN201610511857.9A patent/CN106187187B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153446A (en) * | 1995-12-29 | 1997-07-02 | 黄安荣 | Electrothermal lanthanum chromate body and its mfg. method |
| CN101481252A (en) * | 2009-02-10 | 2009-07-15 | 山东大学 | Rare earth perovskite type fire-resistant material |
| CN104829227A (en) * | 2015-04-24 | 2015-08-12 | 河南科技大学 | Zirconia-zirconium boride double-layer composite ceramic heating element and preparation method thereof |
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