Connecting method of ceramic inserting frame

Abstract

The invention discloses a connection method of a ceramic insertion frame, and relates to the field of solar cell preparation. The connecting method specifically comprises the following steps: coating ceramic slurry on the connecting parts of the parts, and assembling the parts together; the assembled ceramic insertion frame is sintered; wherein the ceramic slurry comprises solid powder and a binder, and the solid powder comprises aluminum oxide, titanium oxide and silicon dioxide. The prepared ceramic insertion frame replaces an existing quartz carrier, has corrosion resistance, and can reduce the production cost of solar cells.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solar cell preparation, in particular to a connecting method of a ceramic holder. BACKGROUND

[0002] When the ceramic holder is prepared by using ceramic material, the connection between the parts of the holder becomes a manufacturing difficulty of the ceramic holder due to the large number of parts of the holder. If the ceramic holder is formed by using the one-piece forming method, the manufacturing cost is too high. If the connection between the parts is realized by using other mechanical structures or materials, the connection strength and corrosion resistance of the ceramic holder are affected. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a connecting method of a ceramic holder, which can ensure the connection strength and corrosion resistance of the prepared ceramic holder and reduce the production cost of solar cell.

[0004] The technical solution adopted by the present application to solve the technical problem comprises a connecting method of a ceramic holder, which comprises the following steps: Applying ceramic slurry to the connecting part of the parts of the ceramic holder, and assembling the parts together; Sintering the assembled ceramic holder; The ceramic slurry comprises solid powder and binder, and the solid powder comprises alumina, titanium oxide and silicon dioxide.

[0005] Further, the present application further discloses that the content of alumina in the total amount of solid powder is 94-97wt%.

[0006] Further, the present application further discloses that the content of titanium oxide in the total amount of solid powder is 0.5-4wt%.

[0007] Further, the present application further discloses that the content of silicon dioxide in the total amount of solid powder is 0.5-4wt%. Further, the present application further discloses that the binder specifically adopts one or more of polyvinyl alcohol, phenolic resin and epoxy resin.

[0008] Further, the present application further discloses that the content of the binder in the total amount of the ceramic slurry is 1-5wt%.

[0009] Further, the present application further discloses that the particle size of the solid powder is 0.1-20μm.

[0010] Further, the present application further discloses that the assembled ceramic holder is placed on the sintering tool for sintering.

[0011] Further, the embodiment of the present application also discloses a sintering temperature of 1380-1410 DEG C, and a total time length of 35-40 hours from temperature rising, temperature keeping and temperature falling in the sintering process.

[0012] In addition, the technical solution adopted by the present application to solve its technical problems also includes a ceramic plug-in rack made by the connecting method of the ceramic plug-in rack.

[0013] The present application has the beneficial effect that the present application realizes the connection of the ceramic plug-in rack parts by smearing ceramic slurry at the connection and sintering, realizes the connection by the same ceramic material, ensures that the density difference between the connection and the ceramic plug-in main body is less than 0.05 g / cm3, and at the same time ensures the connection strength and corrosion resistance of the prepared ceramic plug-in rack, and can reduce the production cost of the solar cell piece. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be further described below in combination with the drawings and embodiments.

[0015] Figure 1 is a structural schematic diagram of a ceramic plug-in rack in the present application.

[0016] Figure 2 is a schematic diagram of the ceramic plug-in rack placed in the sintering mold in the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme of the present application clear, complete and the advantages more clear and obvious, the embodiments of the present application will be further described in combination with the drawings. It should be understood that the specific embodiments described here are part of the embodiments of the present application, not all the embodiments, and are only used to explain the embodiments of the present application, and do not limit the embodiments of the present application, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the present application.

[0018] In the description of the present application, it should be pointed out that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0020] For the purpose of simplicity and illustration, the principles of the embodiments are primarily described by way of example. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one ordinarily skilled in the art that the embodiments can be practiced without the specific details and that numerous implementation choices may be made. In some instances, well-known methods and structures have not been described in detail in order to avoid unnecessarily obscuring the embodiments. Also, all embodiments can be used in combination with each other.

[0021] The figures are set forth to illustrate the relationship between the figures.

[0022] The structure of the ceramic holder disclosed in the present application is shown in Figure 1 The parts include an upper support plate 1 and a lower support plate 2, and at least one pair of support rods 3 is arranged between the upper support plate 1 and the lower support plate 2. The present application is embodied as two pairs of support rods 3, and a plurality of teeth are longitudinally distributed on the support rods 3. The teeth in one pair of support rods 3 are oppositely arranged for carrying solar cell pieces. An ear 4 is arranged at the upper part between the two pairs of support rods 3, facilitating the holding of the ceramic holder. A lower support rod 5 is arranged at the lower part between the two pairs of support rods, for strengthening the support strength.

[0023] The preparation method of the above-mentioned ceramic holder includes the following steps: S1: Place the ceramic powder in the mold, and mold the ceramic blank of the above-mentioned parts. Because the shapes and sizes of different parts are different, different molding methods are adopted, which specifically include: S11: The upper support plate and the lower support plate are molded by dry pressing, and a tungsten steel special mold is used to form under the action of a press, and the pressure condition is 490-610 tons; S12: The support rod, the ear and the lower support rod are completed by isostatic pressing.

[0024] Further, the ceramic powder used is alumina powder, and the content of alumina is 98-99.5wt%, and the rest is resin. The resin can specifically use one or more of polyvinyl alcohol, phenolic resin, and epoxy resin. The resin is mainly used to improve the flowability of the powder and ensure the strength of the green body.

[0025] Further, the particle diameter of the alumina powder is 0.1-60μm.

[0026] S2: Defatting and sintering the ceramic blank. Specifically, the ceramic blank is placed in a high-temperature electric furnace, first heated to 150-500°C for defatting, and then heated to 1630-1650°C for sintering; after a certain period of heat preservation, the ceramic is formed and then slowly cooled down; the total time for heating, heat preservation and cooling is 125-135 hours.

[0027] S3: Grinding, processing and cleaning the sintered parts to obtain the parts required for the ceramic plug-in frame.

[0028] S4: Applying ceramic slurry to the connecting parts of the parts, assembling the parts together according to the drawings, and placing them on the sintering tooling as shown in FIG. Figure 2 The sintering tooling is used to control the relative position of the parts during sintering and the deformation of the parts during sintering.

[0029] Specifically, as shown in FIG. Figure 2 The sintering tooling includes a sintering support plate 6, support grooves 7 are provided on both sides of the sintering support plate 6 for placing the upper support plate 1 and the lower support plate 2. The sintering support plate 6 is also provided with ear support blocks 8 for placing the ears 4.

[0030] S5: Secondary sintering of the assembled ceramic plug-in frame, with a sintering temperature of 1380-1410°C and a total sintering time of 35-40 hours.

[0031] The ceramic plug-in frame thus obtained has an average density of 3.8-4.0 g / cm 3 .

[0032] Further, in order to ensure the connection strength of the ceramic plug-in frame, the ceramic slurry used includes solid powder and binder. The solid powder includes alumina, titanium oxide and silicon dioxide. Specifically, the alumina accounts for 92-97wt% of the total amount of solid powder, the titanium oxide accounts for 0.5-4wt% of the total amount of solid powder, and the silicon dioxide accounts for 0.5-4wt% of the total amount of solid powder.

[0033] In the above technical solution, alumina is used as the main material to provide strength, high temperature resistance and corrosion resistance for the connecting parts of the ceramic plug-in frame. Titanium oxide, as a sintering aid, forms a limited solid solution with alumina, reduces the sintering temperature, refines the grain size and improves the density. Silicon dioxide reacts with alumina at high temperature to form silicate glass phase, filling the grain boundary pores and improving the fracture toughness. The binder specifically uses one or more of polyvinyl alcohol, phenolic resin and epoxy resin, and the content of the binder accounts for 1-5wt% of the total amount of the ceramic slurry. The particle size of the solid powder is 0.1-20μm.

[0034] The technical solutions of the present application are further described below by listing embodiments. However, the present application is not limited to these embodiments.

[0035] Embodiment 1 S1: Put the ceramic powder into the mold to mold the ceramic blank of the above-mentioned part. The upper support plate and the lower support plate are formed by dry pressing, a tungsten steel special mold is used, and the mold is formed under the action of a press machine, and the pressure condition is 500 tons. The support rod, the ear and the lower support rod are completed by isostatic pressing. The ceramic powder used is 99.5wt% alumina powder with a particle size of 1μm. The resin used is polyvinyl alcohol.

[0036] S2: Put the above-mentioned ceramic blank into a high-temperature electric furnace, first heat to 200℃ for degreasing, then heat to 1650℃ for sintering; keep warm for a period of time, and then slowly cool after the ceramic is formed. The total time of heating, keeping warm and cooling is 130 hours.

[0037] S3: Grind, process and clean the sintered part to obtain the required part of the ceramic holder, and observe that the surface of the part has no cracks.

[0038] S4: Apply ceramic slurry to the connecting part of the part, assemble the parts together according to the drawing, and place them on the sintering tool. The binder in the ceramic slurry is polyvinyl alcohol, accounting for 1wt%. The solid powder includes 96wt% alumina, 2.5wt% titanium oxide and 1.5wt% silicon dioxide. The particle size of the solid powder is 1μm.

[0039] S5: The assembled ceramic holder is sintered again, the sintering temperature is 1385℃, and the total time of the sintering process from heating, keeping warm and cooling is 35 hours.

[0040] Use a handheld microscope to check the quality of the ceramic holder prepared in this embodiment, the connection is tight, and no cracks are found. The density of the main body of the ceramic holder is measured to be 3.93g / cm³, and the density of the connecting part is 3.95g / cm³, which is very small.

[0041] Embodiment 2 S1: Put the ceramic powder into the mold to mold the ceramic blank of the above-mentioned part. The upper support plate and the lower support plate are formed by dry pressing, a tungsten steel special mold is used, and the mold is formed under the action of a press machine, and the pressure condition is 490 tons. The support rod, the ear and the lower support rod are completed by isostatic pressing. The ceramic powder used is 98wt% alumina powder with a particle size of 60μm. The resin used is phenolic resin.

[0042] S2: The ceramic blank is placed in a high-temperature electric furnace, first heated to 350°C for debinding, then heated to 1630°C for sintering; after a period of heat preservation, the ceramic is formed and the temperature is slowly reduced, and the total time of heating, heat preservation and cooling is 135 hours.

[0043] S3: The sintered parts are ground, processed and cleaned to obtain the parts required for the ceramic plug-in frame, and the surface of the parts is observed to be free of cracks.

[0044] S4: Ceramic slurry is applied to the connecting parts of the parts, and the parts are assembled together according to the drawing and placed on the sintering tool. The binder in the ceramic slurry is phenolic resin, accounting for 5wt%. The solid powder includes 97wt% alumina, 2wt% titanium oxide and 1wt% silicon dioxide. The particle size of the solid powder is 20μm.

[0045] S5: The assembled ceramic plug-in frame is sintered again, the sintering temperature is 1395°C, and the total time of the sintering process from heating, heat preservation and cooling is 40 hours.

[0046] The ceramic plug-in frame obtained in this embodiment is subjected to quality inspection using a handheld microscope, the connection is tight and no cracks are found. The density of the ceramic plug-in frame body is 3.90g / cm³, the density of the connecting part is 3.92g / cm³, and the difference between the two is very small.

[0047]

Embodiment 3

[0048] S2: The ceramic blank is placed in a high-temperature electric furnace, first heated to 500°C for debinding, then heated to 1640°C for sintering; after a period of heat preservation, the ceramic is formed and the temperature is slowly reduced, and the total time of heating, heat preservation and cooling is 126 hours.

[0049] S3: The sintered parts are ground, processed and cleaned to obtain the parts required for the ceramic plug-in frame, and the surface of the parts is observed to be free of cracks.

[0050] S4: Ceramic slurry is applied to the connecting parts of the parts, and the parts are assembled together according to the drawing and placed on the sintering tool. The binder in the ceramic slurry is epoxy resin, accounting for 3wt%. The solid powder includes 95wt% alumina, 3wt% titanium oxide and 2wt% silicon dioxide. The particle size of the solid powder is 10μm.

[0051] S5: The assembled ceramic plug-in frame is subjected to secondary sintering, the sintering temperature is 1405℃, and the total time length of the sintering process from temperature rising, temperature keeping to temperature falling is 38 hours.

[0052] The ceramic plug-in frame prepared in this embodiment is subjected to quality inspection using a handheld microscope, and the connection is tight and no cracks are found. The density of the ceramic plug-in frame body is measured to be 3.91 g / cm³, and the density of the connection is measured to be 3.93 g / cm³, which is very small.

[0053] [Example 4] S1: The ceramic powder is placed in a mold to mold the ceramic blank of the above-mentioned part. The upper support plate and the lower support plate are formed by dry pressing, and a tungsten steel special mold is used to form under the action of a press, and the pressure condition is 610 tons. The support rod, the ear and the lower support rod are completed by isostatic pressing. Among them, the ceramic powder used is 99wt% alumina powder with a particle size of 30μm. The resin used is epoxy resin.

[0054] S2: The ceramic blank is placed in a high-temperature electric furnace, first heated to 500℃ for debinding, and then heated to 1640℃ for sintering; keep warm for a period of time, and then slowly cool after the ceramic is formed. The total time length of temperature rising, temperature keeping and temperature falling is 126 hours.

[0055] S3: The sintered part is ground, processed and cleaned to obtain the part required for the ceramic plug-in frame, and the surface of the part is observed to be free of cracks.

[0056] S4: Ceramic slurry is applied to the connecting part of the part, and the parts are assembled together according to the drawing and placed on the sintering tool. Among them, the binder in the ceramic slurry is epoxy resin, accounting for 2.5wt%. The solid powder includes 94wt% alumina, 4wt% titanium oxide and 2wt% silicon dioxide. The particle size of the solid powder is 5μm.

[0057] S5: The assembled ceramic plug-in frame is subjected to secondary sintering, the sintering temperature is 1400℃, and the total time length of the sintering process from temperature rising, temperature keeping to temperature falling is 38 hours.

[0058] The ceramic plug-in frame prepared in this embodiment is subjected to quality inspection using a handheld microscope, and the connection is tight and no cracks are found. The density of the ceramic plug-in frame body is measured to be 3.92 g / cm³, and the density of the connection is measured to be 3.93 g / cm³, which is very small.

[0059] [Example 5] S1: Put the ceramic powder into the mold, and mold the ceramic blank of the above-mentioned part. The upper support plate and the lower support plate are formed by dry pressing, a tungsten steel special mold is used, and the mold is formed under the action of a press machine, and the pressure condition is 610 tons. The support rod, the ear and the lower support rod are formed by isostatic pressing. The ceramic powder used is 99wt% alumina powder with a particle size of 30μm. The resin used is epoxy resin.

[0060] S2: Place the ceramic blank in a high-temperature electric furnace, first heat to 500℃ for debinding, then heat to 1640℃ for sintering; keep warm for a period of time, and then slowly cool after the ceramic is formed. The total time for heating, keeping warm and cooling is 126 hours.

[0061] S3: Grind, process and clean the sintered part to obtain the required part of the ceramic holder, and observe that the surface of the part has no cracks.

[0062] S4: Apply ceramic slurry to the connecting part of the part, assemble the parts together according to the drawing, and place them on the sintering tool. The binder in the ceramic slurry is epoxy resin, accounting for 2.5wt%. The solid powder includes 95wt% alumina, 1wt% titanium oxide and 4wt% silicon dioxide. The particle size of the solid powder is 15μm.

[0063] S5: The assembled ceramic holder is sintered again, the sintering temperature is 1410℃, and the total time for heating, keeping warm and cooling during the sintering process is 35 hours.

[0064] The ceramic holder prepared in this embodiment is subjected to quality inspection using a handheld microscope, and the connection is tight and no cracks are found. The density of the ceramic holder body is measured to be 3.92g / cm³, and the density of the connecting part is 3.93g / cm³, which is very small.

[0065] Further, in order to verify the corrosion resistance of the ceramic holder prepared in this application, the ceramic holder prepared in Example 1 is immersed in a 10% and 15% hydrofluoric acid solution together with the existing quartz carrier, and the size change is measured, and the comparison results are as follows.

[0066]

[0067] As shown in the above table, the ceramic holder prepared in this application has better size stability, better carrier rigidity, better acid corrosion resistance, and does not react with hydrofluoric acid compared with the existing quartz carrier. It can replace the existing quartz carrier, has corrosion resistance, the use cycle is extended to 8-10 months, and the production cost of solar cell pieces can be reduced.

[0068] While the foregoing specific embodiments of the application have been described, it will be apparent to one of ordinary skill in the art that various modifications can be made within the spirit and scope of the application as defined by the claims that follow.

Claims

1. A method of connecting a ceramic bay, characterized in that, The method comprises the following steps: applying ceramic slurry to the connecting part of the parts of the ceramic holder, and assembling the parts together; sintering the assembled ceramic holder; The ceramic slurry comprises solid powder and binder, and the solid powder comprises alumina, titanium oxide and silicon dioxide.

2. The method of claim 1, wherein: The alumina accounts for 94-97wt% of the total amount of the solid powder. A method of connecting a ceramic socket according to claim 1, characterized in that The titanium oxide accounts for 0.5-4wt% of the total amount of the solid powder. A method of connecting a ceramic socket according to claim 1, characterized in that The silicon dioxide accounts for 0.5-4wt% of the total amount of the solid powder. A method of connecting a ceramic socket according to claim 1, characterized in that The binder specifically adopts one or more of polyvinyl alcohol, phenolic resin and epoxy resin. A method of connecting a ceramic socket according to claim 1, characterized in that The content of the binder accounts for 1-5wt% of the total amount of the ceramic slurry. A method of connecting a ceramic socket according to claim 1, characterized in that The particle size of the solid powder is 0.1-20μm. A method of connecting a ceramic socket according to claim 1, characterized in that The assembled ceramic holder is placed on a sintering tool for sintering. A method of connecting a ceramic socket according to claim 1, characterized in that The sintering temperature is 1380-1410℃, and the total time length of the sintering process from temperature rising, temperature keeping to temperature falling is 35-40 hours. A ceramic socket, characterized by The ceramic holder is prepared by the connecting method as claimed in any one of claims 1-9.

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