CN110423126B - Platinum channel and protection method thereof - Google Patents
Platinum channel and protection method thereof Download PDFInfo
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- CN110423126B CN110423126B CN201910694551.5A CN201910694551A CN110423126B CN 110423126 B CN110423126 B CN 110423126B CN 201910694551 A CN201910694551 A CN 201910694551A CN 110423126 B CN110423126 B CN 110423126B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/18—Stirring devices; Homogenisation
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/01—Means for taking-off charges of molten glass
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/48—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 zirconium or hafnium oxides, zirconates, zircon or hafnates
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62222—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic coatings
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/50—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
- C04B2235/5454—Particle size related information expressed by the size of the particles or aggregates thereof nanometer sized, i.e. below 100 nm
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Abstract
The invention relates to the field of coatings, and discloses a platinum channel and a protection method of the platinum channel. The outer wall of the platinum channel is provided with a plurality of protective layers, each protective layer contains zirconium oxide and yttrium oxide, and the content of the zirconium oxide is 90-99.8 wt% and the content of the yttrium oxide is 0.02-10 wt% based on the total weight of the protective layers. The platinum channel and the platinum channel protection method provided by the invention can reduce volatilization of noble metals on the outer wall of the platinum pipe of the platinum channel from the source, and can improve production efficiency of the substrate glass, prolong operation time of platinum channel equipment, reduce production cost and meet market requirements on the basis of not changing the operation process of the platinum channel.
Description
Technical Field
The invention relates to the field of coatings, in particular to a platinum channel and a protection method of the platinum channel.
Background
The manufacturing process of the TFT, LTPS substrate glass and optical glass mainly comprises three procedures: the glass substrate comprises a kiln, a platinum channel and a forming process, wherein batch is firstly melted in the kiln, molten glass which is melted flows into the platinum channel for adjustment, and then the molten glass enters the forming process to form substrate glass. The platinum channel is made of noble metal platinum and alloy thereof, and the use state of the platinum channel has great influence on the production cost of the production line.
The platinum channel is formed by connecting a plurality of sections of platinum pipes, and the platinum electrodes on the two sides of each section of platinum pipe apply current to heat the platinum channels, so that the glass metal flowing through the platinum pipes is heated. The service temperature of the platinum channel is above 1000 ℃, and the outer surface of the platinum channel is oxidized by oxygen to volatilize due to long-time high-temperature operation, so that the wall of the platinum pipe is thinned, molten glass leakage is generated, equipment damage and production line stop are caused, and the production cost and the production efficiency are restricted. The platinum channel equipment has a running time of substantially 18 to 24 months, and at 18 months of running, the wear rate is as high as 5 to 8 weight percent.
In the conventional process of manufacturing substrate glass and optical glass, in order to reduce the influence of volatilization of the outer wall of a platinum tube of a platinum channel on the production efficiency and the production cost, the common method comprises the following steps: firstly, the operating temperature of the platinum channel cannot be reduced without limit, and the reduction of the temperature can generate adverse effect on the glass manufacturing process, thereby reducing the production yield and the production efficiency of products; secondly, thickening the wall of the platinum pipe cannot solve the problem of volatilization of the outer wall of the precious metal, the loss of the precious metal cannot be avoided, and the cost of a production line is increased due to the increase of the usage amount of the precious metal, so that the product loses competitiveness. Therefore, the traditional method can not thoroughly solve the problem caused by the volatilization of the platinum pipe of the platinum channel.
Therefore, a protection method for the platinum channel is needed, which can reduce volatilization of noble metals on the outer wall of the platinum pipe of the platinum channel from the source, and can achieve the purposes of improving production efficiency of substrate glass, prolonging operation time of platinum channel equipment, reducing production cost and meeting market requirements on the basis of not changing the operation process of the platinum channel.
Disclosure of Invention
The invention aims to overcome the problems in the prior art, and provides a platinum channel and a protection method of the platinum channel, which can reduce the volatilization of noble metals on the outer wall of the platinum channel from the source, improve the production efficiency of substrate glass, prolong the operation period of platinum channel equipment, reduce the production cost and meet the market demand on the basis of not changing the operation process of the platinum channel.
In order to achieve the above object, a first aspect of the present invention provides a platinum channel, wherein a plurality of protective layers are formed on an outer wall of the platinum channel, the protective layers comprise zirconia and yttria, and the zirconia content is 90 to 99.8 wt% and the yttria content is 0.02 to 10 wt%, based on the total weight of the protective layers.
Preferably, the content of the zirconia is 98.2 to 99.5 wt% and the content of the yttria is 0.05 to 1.8 wt% based on the total weight of the protective layer.
Preferably, the grain sizes of the zirconium oxide and the yttrium oxide are gradually increased from inside to outside.
Preferably, the protective layer is 2-4 layers, and the thickness of each layer is 0.05-0.15 mm.
Preferably, the protective layer is composed of three layers from inside to outside, the thickness of the first layer in the three layers is 0.05-0.1mm, the thickness of the second layer in the three layers is 0.08-0.1mm, and the thickness of the third layer in the three layers is 0.1-0.12 mm.
Preferably, the particle size of the zirconia and yttria in the first layer is 20-30nm, the particle size of the zirconia and yttria in the second layer is 50-90nm, and the particle size of the zirconia and yttria in the third layer is 100-150 nm.
In a second aspect, the present invention provides a method for protecting a platinum channel, wherein the method comprises the step of spraying a mixed powder containing zirconia and yttria on an outer wall of the platinum channel a plurality of times, wherein the zirconia is contained in an amount of 90 to 99.8 wt% and the yttria is contained in an amount of 0.02 to 10 wt%, based on the total weight of the mixed powder containing zirconia and yttria.
Preferably, the content of the zirconia is 98.2 to 99.5% by weight and the content of the yttria is 0.05 to 1.8% by weight, based on the total weight of the mixed powder containing zirconia and yttria.
Preferably, the particle size of the mixed powder containing zirconia and yttria of the next spraying is larger than that of the mixed powder containing zirconia and yttria of the previous spraying.
Preferably, the number of spraying is 2-4.
Preferably, the spraying times are 3, the thickness of the protective layer formed by the first spraying is 0.05-0.1mm, the thickness of the protective layer formed by the second spraying is 0.08-0.1mm, and the thickness of the protective layer formed by the third spraying is 0.1-0.12 mm.
Preferably, the particle size of the mixed powder containing zirconia and yttria of the first spraying is 20-30nm, the particle size of the mixed powder containing zirconia and yttria of the second spraying is 50-90nm, and the particle size of the mixed powder containing zirconia and yttria of the third spraying is 100-150 nm.
Preferably, the temperature of the platinum channel during spraying is 200-300 ℃.
Preferably, the platinum channel is cooled to room temperature after the spraying is finished.
Preferably, the rate of temperature reduction is 4-6 ℃/h.
Preferably, the protection method further comprises wrapping alumina cloth outside the platinum channel sprayed with the mixed powder containing zirconia and yttria.
Preferably, the thickness of the alumina cloth is 0.5-2 mm.
By adopting the platinum channel and the protection method of the platinum channel, provided by the invention, the volatilization of precious metals on the outer wall of the platinum pipe of the platinum channel can be reduced from the source, and the production efficiency of the substrate glass can be improved, the operation period of platinum channel equipment can be prolonged, the production cost can be reduced and the market demand can be met on the basis of not changing the operation process of the platinum channel.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In a first aspect, the present invention provides a platinum channel, wherein a multilayer protective layer is formed on an outer wall of the platinum channel, the protective layer contains zirconia and yttria, and the content of the zirconia is 90 to 99.8 wt% and the content of the yttria is 0.02 to 10 wt% based on the total weight of the protective layer.
In the present invention, preferably, the content of the zirconia is 98.2 to 99.5% by weight and the content of the yttria is 0.05 to 1.8% by weight, based on the total weight of the protective layer.
In the platinum channel of the present invention, zirconia is used to block oxygen from contacting the outer wall of the platinum channel, thereby reducing the oxidation damage of the platinum channel under high temperature conditions, and therefore, considering in combination, the content of zirconia is 90 to 99.8 wt%, preferably 95 to 99.8 wt%, more preferably 98.2 to 99.5 wt%, and specifically, for example, may be 90 wt%, 91 wt%, 92 wt%, 93 wt%, 94 wt%, 95 wt%, 96 wt%, 97 wt%, 98 wt%, 98.2 wt%, 99 wt%, 99.5 wt%, or 99.8 wt%, and any value in the range of any two values of these values, based on the total weight of the protective layer.
In the platinum channel of the present invention, the yttrium oxide is used to block oxygen from contacting the outer wall of the platinum channel, thereby reducing the oxidation damage of the platinum channel under high temperature conditions, and therefore, considering comprehensively, the content of the yttrium oxide is 0.02 to 10 wt%, preferably 0.05 to 1.8 wt%, more preferably 0.5 to 0.7 wt%, and specifically, for example, may be 0.02 wt%, 0.03 wt%, 0.05 wt%, 0.07 wt%, 0.09 wt%, 0.1 wt%, 0.12 wt%, 0.15 wt%, 0.3 wt%, 0.5 wt%, 0.7 wt%, 1 wt%, 1.5 wt%, 1.8 wt%, 3 wt%, 5 wt%, 7 wt%, 9 wt%, or 10 wt%, and any value in the range of any two values of these values, based on the total weight of the protective layer.
In the platinum channel of the invention, in order to further isolate the contact between the outer wall of the platinum channel and oxygen and avoid the oxidation of the outer wall of the platinum channel, thereby reducing the volatilization of the noble metal on the outer wall of the platinum channel, preferably, the grain sizes of the zirconium oxide and the yttrium oxide are gradually increased from inside to outside. By adopting the structure that the grain diameter of the outer layer of zirconia and the grain diameter of the yttria are larger than that of the inner layer of zirconia and the yttria, a compact protective layer is formed on the outer wall, and the contact between oxygen and the outer wall of the platinum channel is fully isolated, so that the high-temperature oxidation damage of the outer wall of the platinum channel is further reduced.
In the platinum channel of the present invention, the multilayer protective layer may be 2 layers or more, and in order to further enhance the protective effect of the protective layer on the platinum channel, the protective layer is preferably 2 to 4 layers, and may be 2 layers, 3 layers or 4 layers, for example.
The thickness of the above-mentioned protective layer is not particularly limited, and in order to further enhance the protective effect of the protective layer against the platinum passage, it is preferable that the thickness of each layer is 0.05 to 0.15 mm.
In the platinum channel, the protective effect of the protective layer on the platinum channel is comprehensively considered, preferably, the protective layer is composed of three layers from inside to outside, the thickness of the first layer of the three layers is 0.05-0.1mm, the thickness of the second layer of the three layers is 0.08-0.1mm, and the thickness of the third layer of the three layers is 0.1-0.12 mm.
The grain size of the zirconia and yttria in the above protection layer is not particularly limited, and in order to further isolate the contact of the platinum channel outer wall with oxygen and avoid the oxidation of the platinum channel outer wall, thereby reducing the volatilization of the noble metal on the platinum channel outer wall, preferably, the grain size of the zirconia and yttria in the first layer is 20-30nm, the grain size of the zirconia and yttria in the second layer is 50-90nm, and the grain size of the zirconia and yttria in the third layer is 100-150 nm.
In a second aspect, the present invention provides a method for protecting a platinum channel, wherein the method comprises the step of spraying a mixed powder containing zirconia and yttria on an outer wall of the platinum channel a plurality of times, wherein the zirconia is contained in an amount of 90 to 99.8 wt% and the yttria is contained in an amount of 0.02 to 10 wt%, based on the total weight of the mixed powder containing zirconia and yttria.
According to the method of the present invention, preferably, the content of zirconia is 98.2 to 99.5% by weight and the content of yttria is 0.05 to 1.8% by weight, based on the total weight of the mixed powder containing zirconia and yttria.
In the method of the present invention, zirconia is used to block contact of oxygen with the outer wall of the platinum channel, thereby reducing oxidation damage of the platinum channel under high temperature conditions, and therefore, considering in combination, the content of zirconia is 90 to 99.8 wt%, preferably 95 to 99.8 wt%, more preferably 98.2 to 99.5 wt%, and specifically, for example, may be 90 wt%, 91 wt%, 92 wt%, 93 wt%, 94 wt%, 95 wt%, 96 wt%, 97 wt%, 98 wt%, 98.2 wt%, 99 wt%, 99.5 wt%, or 99.8 wt%, and any value in the range of any two of these values, based on the total weight of the mixed powder containing zirconia and yttria.
In the method of the present invention, the yttria is used to block the contact of oxygen with the outer wall of the platinum channel, thereby reducing the oxidation damage of the platinum channel under high temperature conditions, and therefore, considering comprehensively, the content of the yttria is 0.02 to 10 wt%, preferably 0.5 to 1.8 wt%, more preferably 0.5 to 0.7 wt%, and specifically, may be, for example, 0.02 wt%, 0.03 wt%, 0.05 wt%, 0.07 wt%, 0.09 wt%, 0.1 wt%, 0.12 wt%, 0.15 wt%, 0.3 wt%, 0.5 wt%, 0.7 wt%, 1 wt%, 1.5 wt%, 1.8 wt%, 3 wt%, 5 wt%, 7 wt%, 9 wt%, or 10 wt%, and any value in the range of any two values of these values, based on the total weight of the mixed powder containing zirconia and yttria.
In the actual operation process, the platinum channel to be sprayed can be pretreated as required, and the pretreatment is the conventional operation in the field, including but not limited to sand blasting the platinum channel to be sprayed, removing surface stains and static electricity, and cleaning the platinum channel.
In a specific embodiment of the present invention, the spraying is performed by plasma spraying.
According to the method of the present invention, the number of spraying is not particularly limited, and may be 2 or more, and in order to further improve the protective effect of the protective layer on the platinum channel, the number of spraying is preferably 2 to 4, and may be 2, 3 or 4, for example.
The thickness of the protective layer formed by spraying is not particularly limited, and in order to further improve the protective effect of the protective layer on the platinum channel, the thickness of the protective layer formed by spraying is preferably 0.05-0.15 mm.
According to the method provided by the invention, the protection effect of the protective layer on the platinum channel is comprehensively considered, and preferably, the spraying times are 3 times, the thickness of the protective layer formed by the first spraying is 0.05-0.1mm, the thickness of the protective layer formed by the second spraying is 0.08-0.1mm, and the thickness of the protective layer formed by the third spraying is 0.1-0.12 mm.
In order to further isolate the contact of the outer wall of the platinum channel with oxygen and avoid the oxidation of the outer wall of the platinum channel, thereby reducing the volatilization of the noble metal on the outer wall of the platinum channel, preferably, the particle size of the mixed powder containing zirconium oxide and yttrium oxide sprayed for the first time is 20-30nm, the particle size of the mixed powder containing zirconium oxide and yttrium oxide sprayed for the second time is 50-90nm, and the particle size of the mixed powder containing zirconium oxide and yttrium oxide sprayed for the third time is 100-150 nm.
According to the method provided by the invention, in order to enhance the protection effect of the protective layer on the precious metal on the outer wall of the platinum channel, preferably, in the spraying process, the temperature of the platinum channel is 200-300 ℃; more preferably, the temperature of the platinum channel during spraying is 280-300 ℃.
According to the method provided by the invention, in order to further enhance the protection effect of the protective layer on the precious metal on the outer wall of the platinum channel, the temperature of the platinum channel is preferably reduced to room temperature after the spraying is finished.
According to the method of the present invention, preferably, the rate of temperature reduction is 4-6 ℃/h.
According to the method, in order to further enhance the protection effect on the noble metal on the outer wall of the platinum channel, the protection method further comprises the step of coating alumina cloth outside the platinum channel sprayed with mixed powder containing zirconium oxide and yttrium oxide.
The alumina content in the alumina cloth is not particularly limited, and in a preferred embodiment of the present invention, the alumina content in the alumina cloth is not less than 99.5%.
According to the method of the present invention, preferably, the thickness of the alumina cloth is 0.5 to 2 mm.
The present invention will be described in detail below by way of examples. In the following examples, each material used was commercially available unless otherwise specified, and the method used was a conventional method in the art unless otherwise specified.
Preparation example
Firstly, performing sand blasting treatment on the outer wall of a platinum pipe to remove surface stains, and removing static electricity and cleaning the platinum pipe after sand blasting is finished;
secondly, heating the platinum tube to 300 ℃, and spraying the mixed powder of the zirconium oxide and the yttrium oxide for the first time by using a plasma technology, wherein the particle size of the mixed powder of the zirconium oxide and the yttrium oxide is 20-30nm, and the thickness of a first layer formed by spraying is 0.05-0.1 mm. After the first layer of spraying is finished, standing for 4 hours, observing the change of the spraying layer on the outer surface of the platinum pipe, and repairing if the coating is stripped;
and thirdly, keeping the platinum tube at 300 ℃, and secondarily spraying mixed powder of zirconium oxide and yttrium oxide by using a plasma technology, wherein the particle size of the mixed powder of zirconium oxide and yttrium oxide is 50-90nm, and the thickness of a second layer formed by spraying is 0.08-0.1 mm. After the second layer of spraying is finished, standing for 4 hours, observing the change of the spraying layer on the outer surface of the platinum pipe, and repairing if the coating is stripped;
fourthly, keeping the platinum tube at 300 ℃, and spraying the mixed powder of the zirconium oxide and the yttrium oxide for the third time by using a plasma technology, wherein the particle size of the mixed powder of the zirconium oxide and the yttrium oxide is 100-150nm, and the thickness of a third layer formed by spraying is 0.1-0.12 mm. After the third layer of spraying is finished, standing for 4 hours, observing the change of the spraying layer on the outer surface of the platinum pipe, repairing if the coating is stripped, and then reducing the temperature of the platinum pipe to 25 ℃ at the cooling rate of 5 ℃/h;
and fifthly, cleaning the surface of the platinum pipe subjected to the three-layer spraying before mounting, and then tightly wrapping the outer wall of the platinum pipe by using an alumina cloth with the wrapping thickness of 0.5-2mm, wherein the content of alumina in the alumina cloth is 99.6 wt%.
Examples 1 to 6 and comparative examples 1 to 2
Platinum pipes of examples 1 to 6 and comparative examples 1 to 2 were prepared according to the conditions shown in Table 1 and the above-described method, and 2 platinum pipes were prepared for each of the examples and comparative examples, one of which was used for measuring the amount of noble metal volatilized after one cycle of use and the other was used for measuring the service life.
Specifically, when the volatilization amount of the precious metal is tested, the obtained platinum pipe is installed according to an equipment installation flow, and is heated and put into use according to the conditions shown in the following table 2, the service cycle is two years, and the test method specifically comprises the following steps: before the platinum tube is put into use, the weight of the platinum tube is accurately measured once, after a service cycle (two years), the platinum tube is dissolved and purified, a noble metal weight is obtained by weighing again, and the ratio of the two weight differences divided by the first accurate measurement value is the ratio of volatilization loss, namely the volatilization amount, and the unit is weight percent, and the result is shown in table 3.
In addition, when the service life is tested, the obtained platinum pipe is installed according to the equipment installation flow, the platinum pipe is heated according to the conditions shown in the following table 2 and then put into use, and when the platinum pipe is used and the damage occurs or the yield of a production line cannot reach the standard, the service life is shown in table 3.
TABLE 1
TABLE 2
TABLE 3
In the invention, because the three zirconium oxide and yttrium oxide spraying layers are added on the outer wall of the platinum pipe, oxygen can be isolated from the outer wall of the platinum pipe in the temperature rise and production operation processes of the platinum channel, so that the equipment damage and production problems caused by oxidation of the platinum channel by the oxygen are avoided, the service life of the equipment can be prolonged and the production cost can be reduced under the condition of not increasing the use amount of noble metals. And in the temperature rise process, the outer surface of the platinum pipe is wrapped by alumina cloth, the temperature rise rate is controlled, the platinum pipe is prevented from being distorted, deformed and damaged in the temperature rise process of the platinum channel platinum pipe, and the phenomenon that the coating is damaged by refractory materials outside the platinum pipe can be avoided, so that the service life of the platinum channel is prolonged. The production operation temperature of the equipment can be ensured, the damage to the platinum pipe of the platinum channel is not reduced by adjusting the production process, and the production efficiency is improved.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (11)
1. A platinum channel is characterized in that a plurality of protective layers are formed on the outer wall of the platinum channel, each protective layer contains zirconium oxide and yttrium oxide, the content of the zirconium oxide is 90-99.8 wt% and the content of the yttrium oxide is 0.02-10 wt% based on the total weight of the protective layers,
the protective layer is composed of three layers from inside to outside, and the grain diameters of the zirconium oxide and the yttrium oxide are gradually increased from inside to outside;
wherein the grain size of the zirconia and the yttria in the first layer is 20-30nm, the grain size of the zirconia and the yttria in the second layer is 50-90nm, and the grain size of the zirconia and the yttria in the third layer is 100-150 nm.
2. The platinum channel of claim 1, wherein said zirconia is present in an amount of 98.2 to 99.5 wt.% and said yttria is present in an amount of 0.05 to 1.8 wt.%, based on the total weight of said protective layer.
3. A platinum channel according to claim 1 or 2, characterised in that the thickness of the first of said three layers is 0.05-0.1mm, the thickness of the second of said three layers is 0.08-0.1mm and the thickness of the third of said three layers is 0.1-0.12 mm.
4. A protection method of a platinum channel is characterized by comprising the step of spraying a mixed powder containing zirconium oxide and yttrium oxide on the outer wall of the platinum channel for a plurality of times, wherein the content of the zirconium oxide is 90-99.8 wt% and the content of the yttrium oxide is 0.02-10 wt% based on the total weight of the mixed powder containing zirconium oxide and yttrium oxide;
the spraying times are 3 times, and the particle size of the mixed powder containing zirconium oxide and yttrium oxide sprayed next time is larger than that of the mixed powder containing zirconium oxide and yttrium oxide sprayed last time;
wherein the grain diameter of the mixed powder containing zirconia and yttria sprayed for the first time in the multiple spraying is 20-30nm, the grain diameter of the mixed powder containing zirconia and yttria sprayed for the second time in the multiple spraying is 50-90nm, and the grain diameter of the mixed powder containing zirconia and yttria sprayed for the third time in the multiple spraying is 100-150 nm.
5. The protective method according to claim 4, wherein the content of the zirconia is 98.2 to 99.5% by weight and the content of the yttria is 0.05 to 1.8% by weight, based on the total weight of the mixed powder containing zirconia and yttria.
6. The protective method according to claim 4, wherein the protective layer formed by the first spraying has a thickness of 0.05 to 0.1mm, the protective layer formed by the second spraying has a thickness of 0.08 to 0.1mm, and the protective layer formed by the third spraying has a thickness of 0.1 to 0.12 mm.
7. The protection method as claimed in any one of claims 4 to 6, wherein the temperature of the platinum channel during spraying is 200-300 ℃.
8. The method of any one of claims 4 to 6, wherein the platinum channel is cooled to room temperature after the spraying is completed.
9. The method of claim 8, wherein the cooling rate is 4-6 ℃/h.
10. The protection method according to any one of claims 4 to 6, further comprising wrapping alumina cloth outside the platinum channel sprayed with the mixed powder containing zirconia and yttria.
11. The protection method according to claim 10, wherein the thickness of the alumina cloth is 0.5 to 2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910694551.5A CN110423126B (en) | 2019-07-30 | 2019-07-30 | Platinum channel and protection method thereof |
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| US4663205A (en) * | 1985-05-16 | 1987-05-05 | Toyota Jidosha Kabushiki Kaisha | Thermocouple protective tube |
| CN202913087U (en) * | 2012-10-30 | 2013-05-01 | 烟台核晶陶瓷新材料有限公司 | Ceramic crucible for polycrystalline silicon ingot |
| CN203513471U (en) * | 2013-07-10 | 2014-04-02 | 彩虹显示器件股份有限公司 | Platinum channel pipe fitting |
| CN106363183A (en) * | 2016-09-27 | 2017-02-01 | 哈尔滨工业大学 | Yttrium oxide-tungsten gradient material, preparation method of yttrium oxide-tungsten gradient material, and application of yttrium oxide-tungsten gradient material in manufacturing of crucible for metal smelting |
| CN208907075U (en) * | 2018-07-27 | 2019-05-28 | 彩虹显示器件股份有限公司 | A kind of protective device of platinum thermocouple wire |
| CN109837498A (en) * | 2017-11-24 | 2019-06-04 | 彩虹显示器件股份有限公司 | A kind of method in indirect dispersion-strengtherning platinum channel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3394844B2 (en) * | 1994-05-23 | 2003-04-07 | 株式会社東芝 | Heat resistant material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4663205A (en) * | 1985-05-16 | 1987-05-05 | Toyota Jidosha Kabushiki Kaisha | Thermocouple protective tube |
| CN202913087U (en) * | 2012-10-30 | 2013-05-01 | 烟台核晶陶瓷新材料有限公司 | Ceramic crucible for polycrystalline silicon ingot |
| CN203513471U (en) * | 2013-07-10 | 2014-04-02 | 彩虹显示器件股份有限公司 | Platinum channel pipe fitting |
| CN106363183A (en) * | 2016-09-27 | 2017-02-01 | 哈尔滨工业大学 | Yttrium oxide-tungsten gradient material, preparation method of yttrium oxide-tungsten gradient material, and application of yttrium oxide-tungsten gradient material in manufacturing of crucible for metal smelting |
| CN109837498A (en) * | 2017-11-24 | 2019-06-04 | 彩虹显示器件股份有限公司 | A kind of method in indirect dispersion-strengtherning platinum channel |
| CN208907075U (en) * | 2018-07-27 | 2019-05-28 | 彩虹显示器件股份有限公司 | A kind of protective device of platinum thermocouple wire |
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Application publication date: 20191108 Assignee: Zhejiang Chuangrou Display Technology Co.,Ltd. Assignor: DONGXU OPTOELECTRONIC TECHNOLOGY Co.,Ltd. Contract record no.: X2023110000127 Denomination of invention: Platinum channels and protection methods for platinum channels Granted publication date: 20220329 License type: Exclusive License Record date: 20231010 |