Coating composition for platinum channel and preparation method of coating material, platinum channel

Abstract

The present invention provides a coating composition for a platinum channel, a method for preparing a coating material, and a platinum channel, and relates to the field of glass substrate production technology. The coating composition is mainly composed of the following components by mass percentage: 55%-65% SiO2, 10-13.5% B2O3, 6%-9% Li2O, 6%-8% Na2O, 1%-3% CaO, 2-3.5% SrO, and 5%-7% other substances.

Description

Technical Field

[0001] The present disclosure relates to the field of glass substrate production technology, and in particular to a coating composition for a platinum channel, a preparation method of the coating material, and a platinum channel. Background Art

[0002] The main function of the platinum channel in substrate glass production is to clarify, homogenize and cool the molten glass, and provide qualified and high-quality molten glass to the next process.

[0003] The platinum tube of the platinum channel body is mainly made of PtRh alloy material. During the heating process of the platinum channel, the inner wall of the platinum tube is always exposed to the air. In the high-temperature oxidizing environment, metals such as Pt and Rh in the platinum tube are easy to volatilize or generate metal oxides, which are attached to the inner wall of the platinum tube. After the heating of the platinum channel ends, these Pt, Rh and their oxides attached to the inner wall of the platinum tube will be mixed in the glass liquid to form glass defects.

[0004] Therefore, how to reduce the volatilization of metals such as Pt and Rh in platinum tubes and the generation of their oxides is a problem that needs to be solved urgently. Summary of the invention

[0005] A technical problem to be solved by the present disclosure is: how to reduce the volatilization of metals such as Pt and Rh in the platinum tube and the generation of their oxides.

[0006] In order to solve the above technical problems, the embodiment of the present disclosure provides a coating composition for a platinum channel, which is mainly composed of the following components in terms of mass percentage: 55%-65% SiO2, 10-13.5% B2O3, 6%-9% Li2O, 6%-8% Na2O, 1%-3% CaO, 2-3.5% SrO, and 5%-7% other substances.

[0007] In some embodiments, the other substances include at least one or more of: ZnO, MgO, Ti2O, ZrO2, SnO, BaO, and Al2O3.

[0008] In some embodiments, the other substances include at least one or more of CoO, CrO3, and NiO, and the sum of the mass percentages of CoO, CrO3, and NiO in the composition is no more than 1%.

[0009] The disclosed embodiment also provides a method for preparing a coating material for a platinum channel, the method comprising: mixing and melting the above-mentioned composition, quenching it by rapid cooling, and grinding and screening to obtain glass powder.

[0010] In some embodiments, the glass powder has a particle size of 160 mesh to 280 mesh.

[0011] The disclosed embodiment also provides a platinum channel, which includes: a platinum channel body, the inner wall of which is provided with a protective layer coated with the platinum channel coating material obtained by the above method.

[0012] In some embodiments, the protective layer has a thickness of 0.3-2 mm.

[0013] In some embodiments, the protective layer is applied to the non-welding area of ​​the inner wall of the platinum channel body.

[0014] The disclosed embodiment also provides a method for manufacturing a platinum channel, the method comprising: using a spray gun to spray the platinum channel coating material obtained by the above method onto the inner wall of the platinum profile to form a protective layer.

[0015] In some embodiments, before forming the protective layer, the method further includes:

[0016] A shielding layer is provided in the welding area of ​​the platinum profile to form the platinum profile into a platinum tube;

[0017] After forming the protective layer, it also includes:

[0018] The shielding layer is removed, the platinum profile is welded to form a platinum tube, and then the platinum tube is welded to form a platinum channel body.

[0019] Through the above technical scheme, the present disclosure provides a coating composition for a platinum channel, a method for preparing a coating material, and a platinum channel. The coating composition can be prepared to form glass powder. In the manufacturing process of the platinum channel body, by spraying the glass powder on the inner wall of the platinum channel body at high temperature, a protective layer with strong adhesion can be formed on the inner wall of the platinum channel body, which plays a role in isolating the air, making Pt and Rh of the platinum channel body less likely to volatilize, reducing the defects of the product, and also playing a role in protecting the platinum channel body; by adding a certain amount of Li2O to the compound, the expansion coefficient of the formed protective layer can be increased to adapt to the expansion of the platinum channel body during the heating process, and when the temperature of the platinum channel body reaches or even exceeds the melting temperature of the protective layer, the protective layer can form a molten glass protective film, which can always play a protective role in isolating the air; and the protective film made of glass powder will be replaced with the flushing of glass liquid during production, and will not affect the components of the glass liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the spraying process in the method for manufacturing a platinum channel disclosed in an embodiment of the present disclosure;

[0022] Figure 2 It is a schematic diagram of the spraying position in the manufacturing method of the platinum channel disclosed in the embodiment of the present disclosure;

[0023] Figure 3 It is a schematic diagram of the partial structure of the platinum channel disclosed in the embodiment of the present disclosure.

[0024] Description of reference numerals:

[0025] 1. Platinum channel body; 2. Protective layer; 3. Welding bead; 4. Spray gun; 41. Electrode; 42. Air pipe; 43. Glass powder tube; 44. Nozzle; 5. Plasma power supply; 6. Plasma arc; 7. Shielding layer. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0027] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0028] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0029] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0030] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0031] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0033] Embodiment 1

[0034] Embodiment 1 of the present invention proposes a coating composition for a platinum channel. The coating composition is mainly composed of the following components, measured by mass percentage: 55%-65% SiO2, 10-13.5% B2O3, 6%-9% Li2O, 6%-8% Na2O, 1%-3% CaO, 2-3.5% SrO, and 5%-7% other substances.

[0035] Specifically, the above substances are mixed to form a composition for preparing a coating material for a platinum channel, specifically a composition for forming glass powder. In the manufacturing process of the platinum channel body 1, the glass powder is sprayed on the inner wall of the platinum channel body 1 at high temperature, so that a protective layer 2 with strong adhesion can be formed on the inner wall of the platinum channel body 1. Since the platinum channel body 1 will expand after heating, and the expansion coefficient of the protective layer 2 is different from that of the platinum channel body 1, in the technical solution adopted by the present invention, a certain amount of Li2O is added to the compound, so that the adhesion and expansion amount of the formed protective layer 2 can be improved to adapt to the expansion coefficient of the platinum channel body 1. When the temperature of the platinum channel body 1 is lower than the protective layer 2, the protective layer 2 can be formed on the inner wall of the platinum channel body 1. When the temperature of the platinum channel body 1 reaches or even exceeds the melting temperature of the protective layer 2, the protective layer 2 can form a molten glass protective film, which can isolate the air and make the Pt and Rh of the platinum channel body 1 not easy to volatilize and form no metal oxides, thereby reducing the defects of the product and protecting the platinum channel body 1. The protective film made of glass powder will be replaced with the flushing of the glass liquid during production and will not affect the components of the glass liquid. The mass percentage of Li2O and other components can be designed and increased or decreased according to actual conditions.

[0036] Specifically, one implementation method may be: the combination components of the coating composition for a platinum channel are set according to the following mass percentages, including: 60.0% SiO2, 12.5% ​​B2O3, 8.9% Li2O, 7.5% Na2O, 2.0% CaO, 3.0% SrO and 6.1% other substances, wherein the other substances here may be impurities of the substance, specifically may include one or more of ZnO, MgO, Ti2O, ZrO2, SnO, BaO, Al2O3.

[0037] According to the above, an embodiment of the present invention proposes a coating composition for a platinum channel, which can be prepared to form glass powder. In the manufacturing process of the platinum channel body 1, by spraying the glass powder on the inner wall of the platinum channel body 1 at high temperature, a protective layer 2 with strong adhesion can be formed on the inner wall of the platinum channel body 1, which plays a role in isolating the air, making the Pt and Rh of the platinum channel body 1 not easy to volatilize, reducing the defects of the product, and also playing a role in protecting the platinum channel body 1; by adding a certain amount of Li2O to the compound, the expansion coefficient of the formed protective layer 2 can be increased to adapt to the expansion of the platinum channel body 1 during the heating process, and when the temperature of the platinum channel body 1 reaches or even exceeds the melting temperature of the protective layer 2, the protective layer 2 can form a molten glass protective film, which can always play a protective role in isolating the air; and the protective film made of glass powder will be replaced with the flushing of the glass liquid during production, and will not affect the components of the glass liquid.

[0038] In a specific implementation, the other substances include at least one or more of CoO, CrO3, and NiO, and the sum of the mass percentages of CoO, CrO3, and NiO in the composition is not greater than 1%.

[0039] Specifically, in order to further improve the expansion coefficient of the protective layer 2 finally formed, in the technical solution adopted by the present invention, one or a combination of more than two of CoO, CrO3, and NiO can be added to the composition in appropriate amounts. After the three glass colorants are added in trace amounts, the adhesion and collision performance of the protective layer 2 can be further improved while ensuring that they will not affect the pollution and staining of the glass; the trace amount here specifically refers to the total mass percentage of the three glass colorants CoO, CrO3, and NiO added to the composition not exceeding 1%. Of course, it can be set specifically according to actual conditions.

[0040] Embodiment 2

[0041] The second embodiment of the present invention provides a method for preparing a coating material for a platinum channel, using the above-mentioned composition, and the specific steps are: mixing and melting the above-mentioned composition, quenching it by rapid cooling, and grinding and screening to obtain glass powder.

[0042] Specifically, when preparing the coating material, the above-mentioned platinum channel coating composition is used, the composition is mixed evenly and melted, the melting temperature can be about 1300 degrees Celsius, but not limited to this, and then it is subjected to rapid cooling and quenching technology, and then ground into powder, and the glass powder with the required particle size is screened out, and the particle size that meets the requirements here can specifically be 160 mesh-280 mesh.

[0043] According to the above, an embodiment of the present invention proposes a method for preparing a coating material for a platinum channel. The prepared glass powder is sprayed on the inner wall of a platinum channel body 1 at high temperature, and a protective layer 2 with strong adhesion can be formed on the inner wall of the platinum channel body 1, which plays a role in isolating the air and adapts to the temperature increase and expansion of the platinum channel body 1 to a certain extent, so that Pt and Rh of the platinum channel body 1 are not easy to volatilize, thereby reducing the defects of the product and protecting the platinum channel body 1.

[0044] Embodiment 3

[0045] Reference Figure 3 The third embodiment of the present invention provides a platinum channel, which includes: a platinum channel body 1, the inner wall of which is provided with a protective layer 2 coated with the platinum channel coating material obtained by the above method.

[0046] Specifically, the platinum channel provided in this embodiment includes a platinum channel body 1, whose inner wall is coated with a protective layer 2, and the protective layer 2 is coated with the above-mentioned coating material and has a thickness of 0.3-2mm. It is coated on the inner wall of the platinum channel body 1 to play a protective role. The protective layer 2 made of glass powder has a dense structure at low temperature. During the heating and expansion process of the platinum channel body 1, the protective layer 2 can expand adaptively, and when the temperature is raised to the point where the protective layer 2 melts, the protective layer 2 can adhere to the inner wall of the platinum channel body 1, always playing a role of protecting and isolating the air. During production, the protective layer 2 will be replaced as the glass liquid is flushed, and will not affect the components of the glass liquid.

[0047] Reference Figure 2 and attached Figure 3 In a specific implementation, the protective layer 2 is coated on the non-welding area of ​​the inner wall of the platinum channel body 1 .

[0048] Specifically, the platinum channel body 1 is formed by welding a plurality of platinum tubes. To avoid affecting the welding quality of the platinum channel body 1, the inner wall of the platinum tube can be sprayed with a plurality of methods, such as spraying the protective layer 2 on the platinum tube and then welding to form the platinum channel body 1, welding the platinum tube to form the platinum channel body 1 and then spraying the protective layer 2 on the entire body, or welding after spraying the protective layer 2. In the technical solution adopted by the present invention, when the platinum tube is sprayed with a protective layer 2 and then welded to form the platinum channel body 1, or the platinum tube is welded to form the platinum channel body 1 and then spraying the protective layer 2 on the entire body, a non-welding area can be reserved before spraying, and a shielding layer 7 can be set in the welding area. Figure 2 The shielding layer 7 is fixed and bent and wrapped around the end of the platinum tube, and the width can be 2-3 mm. The shielding layer 7 can specifically be a metal foil and a high-temperature resistant material, which plays a protective role and prevents glass powder in the welding area from affecting the quality of subsequent welding.

[0049] Embodiment 4

[0050] Reference Figure 1 and attached Figure 2 , Embodiment 4 of the present invention provides a platinum channel, the platinum channel comprising:

[0051] The platinum channel coating material obtained by the above method is sprayed onto the inner wall of the platinum profile by using a spray gun 4 to form a protective layer 2 .

[0052] Specifically, the spraying method can be flame spraying, arc spraying, plasma spraying or laser spraying to form a protective layer 2 on the inner wall of the platinum profile. The platinum here is used to form a platinum tube, and then the platinum tube is further welded to form a platinum channel body 1. In order to ensure the quality of glass powder spraying, a dedicated glass powder spraying tooling equipment can be designed, and the glass powder can be sprayed by a combination of automatic and manual spraying.

[0053] Taking the plasma spray gun 4 as an example, the specific method is as follows: the prepared glass powder is connected to the plasma spray gun 4 through the glass powder tube 43, and the gas tube 42 is connected to the argon gas pipeline with a pressure of 0.5MPa to 0.7MPa, which serves as the spraying gas and protective gas of the glass powder spray gun 4. When the plasma power supply 5 is connected between the electrode 41 and the nozzle 44, a plasma arc 6 is generated. The function of the argon gas is to protect the plasma arc 6, which can stabilize the plasma arc 6, and spray the plasma flame mixed with the glass powder from the spray gun 4 to form a high-temperature molten glass powder liquid flow with a certain speed, which impacts the inner wall of the platinum profile to form a glass powder coating, that is, a protective layer 2. The temperature of the glass powder coating is controlled between 663 degrees Celsius and 880 degrees Celsius, which can avoid crystallization of the glass powder coating and affect its adhesion; wherein, the angle between the glass powder sprayed from the spray gun 4 and the inner wall of the platinum profile can be between 50° and 90°.

[0054] Reference Figure 2 and attached Figure 3 In a specific implementation, before forming the protective layer 2, it also includes: setting a shielding layer 7 in the welding area of ​​the platinum profile to form the platinum profile into a platinum tube;

[0055] After the protective layer 2 is formed, the method further includes: removing the shielding layer 7 , welding the platinum profiles to form platinum tubes, and then welding the platinum tubes to form the platinum channel body 1 .

[0056] Specifically, in the technical solution adopted by the present invention, a method is adopted in which a protective layer 2 is sprayed on a platinum tube and then welded to form a platinum channel body 1. In order to avoid damage to the protective layer 2 during the process of bending the platinum profile into a platinum tube after the protective layer 2 is formed, a specific solution is adopted: a shielding layer 7 is first set in the welding area of ​​the platinum profile. The shielding layer 7 can specifically be a metal foil and a high-temperature resistant material with a width of 2-3mm. The platinum profile is then made into a platinum tube, but it is not welded. Instead, a protective layer 2 is first formed, and then the shielding layer 7 is removed, and the platinum profile is welded to form a platinum tube, and then the platinum tube is further welded to form a platinum channel body 1. The weld bead 3 at the welding position is as shown in the attached figure. Figure 3 shown.

[0057] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0058] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A coating composition for a platinum channel, characterized in that: In terms of mass percentage, it is mainly composed of the following components: 55%-65% SiO2, 10-13.5% B2O3, 6%-9% Li2O, 6%-8% Na2O, 1%-3% CaO, 2-3.5% SrO, and 5%-7% other substances; The other substances include at least one or more of ZnO, MgO, Ti2O, ZrO2, SnO, BaO, and Al2O3; and / or, The other substances include at least one or more of CoO, CrO3, and NiO, and the sum of the mass percentages of CoO, CrO3, and NiO in the composition is not greater than 1%.

2. A method for preparing a coating material for a platinum channel, characterized in that: include: The composition according to claim 1 is mixed and melted, then quenched, ground and screened to obtain glass powder.

3. The method for preparing the coating material for platinum channel according to claim 2, characterized in that: The particle size of the glass powder is 160 meshes to 280 meshes.

4. A platinum channel, characterized in that: include: A platinum channel body (1) has an inner wall provided with a protective layer (2) coated with a platinum channel coating material obtained by the method described in any one of claims 2-3.

5. The platinum channel according to claim 4, characterized in that: The thickness of the protective layer (2) is 0.3-2 mm.

6. The platinum channel according to claim 4, characterized in that: The protective layer (2) is coated on the non-welding area of ​​the inner wall of the platinum channel body (1).

7. A method for manufacturing a platinum channel, characterized in that: include: The platinum channel coating material obtained by the method described in any one of claims 2 to 3 is sprayed onto the inner wall of the platinum profile using a spray gun (4) to form a protective layer (2).

8. The method for manufacturing a platinum channel according to claim 7, characterized in that: Before forming the protective layer (2), the method further comprises: A shielding layer (7) is provided in the welding area of ​​the platinum profile, and the platinum profile is formed into a platinum tube; After forming the protective layer (2), the method further comprises: The shielding layer (7) is removed, the platinum profile is welded to form a platinum tube, and then the platinum tube is welded to form a platinum channel body (1).

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