Sintering molding kiln furniture for aluminum oxide mobile phone backboard

Abstract

A sintering forming kiln furniture of an aluminum oxide mobile phone backboard comprises a shaping upper setter board, a shaping lower setter board, an organic side shaping block and an organic inner shaping block, the contact faces of the shaping upper setter board and the shaping lower setter board with a blank backboard sample have the same curvature and do not contain organic matter, and the shape of the sample is always kept during sintering shrinkage; the contact surfaces of the organic side shaping block and the organic inner shaping block with the blank backboard sample have the same curvature, are made of organic matters, do not contain inorganic matters, and are completely burnt off and decomposed into gas to be discharged in the glue discharging process. The organic side shaping block and the organic inner shaping block can play a role in shaping the sample in the glue discharging process, can be completely burnt off and decomposed into gas to be discharged, and cannot prevent the sample from shrinking in the sintering shrinkage stage to cause deformation and cracking of the sample, so that the precision of the obtained finished product is good. The kiln furniture is particularly suitable for glue discharging and sintering of 2.5 D and 3D mobile phone backboards with curved surfaces.

Description

Technical Field

[0001] The utility model relates to a sintering kiln, in particular to a sintering kiln for forming an alumina mobile phone back plate, and belongs to the technical field of alumina ceramic application. Background Art

[0002] The back panel of a mobile phone, which we usually call the back cover of a mobile phone, is an important part of the entire mobile phone. It mainly plays the role of preventing impact, scratching, beautifying the appearance, and protecting a small amount of exposed devices such as cameras and microphones. The back panel of a mobile phone is an indispensable part of a mobile phone.

[0003] In recent years, many new materials have attracted much attention due to the development and rise of the mobile phone manufacturing industry. Alumina ceramic mobile phone back panels are one of them. The tape casting method combined with mold pressing to produce ordinary, 2.5D, and 3D alumina mobile phone back panels is feasible and practical, and the mechanical properties can be optimized through structural and process optimization. However, the tape casting method causes organic matter to be contained in the blank, and the finished product must be obtained through debinding and sintering. Debinding is to slowly increase the temperature in a lower temperature range so that the organic matter is slowly decomposed into gas and removed, so as to avoid decomposition too quickly and cause cracking of the blank. However, after the organic matter is removed, the strength of the blank is greatly reduced, especially for 2.5D and 3D mobile phone back panels, there is a great possibility of deformation. At the same time, the shrinkage during sintering at a higher temperature will also cause problems such as cracking and deformation.

[0004] Therefore, it is necessary to develop a sintering kiln suitable for alumina mobile phone back panels to prevent problems such as deformation and cracking of the back panel embryo samples during the debinding sintering process. Summary of the invention

[0005] The purpose of the utility model is to improve the deficiencies in the prior art and provide a sintering kiln suitable for alumina mobile phone back panels, which can effectively prevent the back panel blank sample from deforming and cracking during the debinding and sintering process, thereby obtaining alumina mobile phone back panel finished products with good precision.

[0006] The beneficial effects of the utility model are mainly reflected in:

[0007] The utility model of alumina mobile phone back panel sintering and molding kiln, in addition to the shaping upper support plate and the shaping lower support plate, also adds organic side shaping blocks and organic internal shaping blocks. The organic side shaping blocks and the organic internal shaping blocks are all made of organic matter and do not contain inorganic matter. In this way, they can not only shape the sample during the debinding process, but also be completely burned and decomposed into gas and discharged. Therefore, they will not block the shrinkage of the sample during the sintering shrinkage stage and cause the sample to deform or crack, thereby obtaining a finished product with good precision. The utility model of alumina mobile phone back panel sintering and molding kiln is particularly suitable for debinding and sintering of 2.5D and 3D mobile phone back panels with curved surfaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a side view of ordinary mobile phone back panels, 2.5D and 3D mobile phone back panels.

[0009] Figure 2 It is a cross-sectional view of a kiln for sintering and forming an alumina mobile phone back panel of the utility model.

[0010] Figure 3 It is a three-dimensional diagram of the alumina mobile phone back panel sintering kiln of the utility model. DETAILED DESCRIPTION

[0011] The following provides specific implementations to further illustrate the present invention, but the present invention is not limited to the following implementations.

[0012] Figure 1 This is a side view of a normal mobile phone back panel, a 2.5D mobile phone back panel, and a 3D mobile phone back panel. Figure 1 As shown, A represents an ordinary mobile phone back panel, which is all flat; B represents a 2.5D mobile phone back panel, which is basically flat, with only a certain curvature on the side; C represents a 3D mobile phone back panel, which is all curved and has a certain curvature on the side. Usually, the process of mobile phone back panel tape casting is to make a tape sheet from alumina powder, make a pressing mold according to the size and shape requirements of the final mobile phone back panel (ordinary, 2.5D or 3D requirements) and the shrinkage rate of the tape sheet, cut the tape sheet and place it in the mold for pressing and trimming to become a blank back panel, and then place the blank back panel in a sintering kiln to remove the binder and sinter to obtain the finished mobile phone back panel. Since the 2.5D and 3D mobile phone back panels are not pure planes and need to have a certain curvature, they are prone to deformation and cracking during the debinding and sintering process, especially the curved surface of the 3D mobile phone back panel often deforms, so it is difficult to obtain a finished product with good precision.

[0013] In order to solve the above problems, the utility model proposes a new alumina mobile phone back panel sintering kiln. Figure 2 This is a cross-sectional view of the kiln furniture. Figure 3 This is a three-dimensional diagram of the kiln. The blank backboard sample 1 in the figure is a blank backboard obtained by tape casting. The tape casting process obtains an alumina powder molded part containing an organic molding agent. The organic molding agent is a chemical substance that must be added during the alumina powder tape casting process. The organic matter needs to be slowly decomposed into gas through the subsequent debinding and sintering process to be removed from the blank backboard sample 1.

[0014] like Figure 2 and Figure 3As shown, the alumina mobile phone back panel sintering molding kiln of the utility model includes a shaping upper supporting plate 2, a shaping lower supporting plate 3, an organic side shaping block 4 and an organic inner shaping block 5, wherein the shaping upper supporting plate 2 and the shaping lower supporting plate 3 have the same curvature as the contact surface of the blank back panel sample 1 and do not contain organic matter, and always maintain the shape of the sample during sintering shrinkage; the organic side shaping block 4 and the organic inner shaping block 5 have the same curvature as the contact surface of the blank back panel sample 1 and are made of organic matter and do not contain inorganic matter, and can not only shape the sample during debinding sintering, but also can be decomposed and discharged together with the organic forming agent in the sample, and will not block the shrinkage of the blank back panel sample 1 during the sintering shrinkage stage to cause its deformation and cracking.

[0015] Specifically, the upper shaping support plate 2 and the lower shaping support plate 3 are made of porous loose ceramic materials, which are easy to be processed into the same curvature as the contact surface of the blank back plate sample 1, so as to maintain the shape of the sample during sintering shrinkage; in addition, the porous ceramic material is used to facilitate the gas generated by the volatilization of organic matter during debinding to be discharged from the pores. The organic side shaping block 4 and the organic inner shaping block 5 are formed parts obtained by casting an organic slurry composed of the same organic shaping agent as the blank back plate sample 1, an organic binder, a solvent, etc., and are formed by mold pressing. During the debinding and sintering process, they are burned together with the organic shaping agent in the blank back plate sample 1 and decomposed into gas and discharged.

[0016] When in use, the green embryo back plate sample 1 is placed on the lower shaping support plate 3. In order to prevent the sample from deforming during debinding and sintering, an organic side shaping block 4 is placed on the side of the green embryo back plate sample 1, an organic inner shaping block 5 is placed on the top of the green embryo back plate sample 1, and a shaping upper shaping support plate 2 is placed on the top of the organic inner shaping block 5. The size of the shaping upper shaping support plate 2 should be smaller than the size of the organic inner shaping block 5, and slightly smaller than the plane size of the green embryo back plate sample 1 after debinding and sintering, so that it can not only play a shaping role, but also prevent the green embryo back plate sample 1 from being broken and damaged by the shaping upper shaping support plate 2 after sintering and shrinkage.

[0017] The surface of the lower shaping support plate 3 and the organic internal shaping block 5 in contact with the blank backboard sample 1 should conform to the shape of the sample surface and be completely consistent with the shape of the sample surface, that is, it is a plane in ordinary mobile phone backboards and 2.5D mobile phone backboards, and a curved surface in 3D mobile phone backboards, so as to prevent the sample from deforming during the debinding and sintering process. The organic side shaping block 4 and the organic internal shaping block 5 are modules made of pure organic matter, which play a role in preventing the blank backboard sample 1 from deforming during the debinding stage. After the debinding is completed, the organic side shaping block 4 and the organic internal shaping block 5 also disappear together, leaving the shape of the sample preserved. For ordinary mobile phone backboards, the organic side shaping block 4 and the organic internal shaping block 5 can also be omitted during use.

[0018] The alumina mobile phone back panel sintering molding kiln of the utility model effectively prevents deformation, cracking and other problems of the blank back panel sample during the debinding and sintering process by adding organic side molding blocks and organic inner molding blocks that can be burned together. The finished product has good precision, especially for 2.5D and 3D mobile phone back panels with curved surfaces.

[0019] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0020] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A sintering kiln for an alumina mobile phone back panel, characterized in that: It includes an upper shaping plate, a lower shaping plate, an organic side shaping block and an organic inner shaping block, wherein the contact surfaces of the upper shaping plate and the lower shaping plate with the blank back plate sample have the same curvature and do not contain organic matter, and always maintain the shape of the sample during sintering shrinkage; the contact surfaces of the organic side shaping block and the organic inner shaping block with the blank back plate sample have the same curvature and are made of organic matter, do not contain inorganic matter, and are completely burned and decomposed into gas and discharged during the debinding process.

2. The sintering kiln for alumina mobile phone back panel according to claim 1, characterized in that: The upper shaping support plate and the lower shaping support plate are made of porous loose ceramic material.

3. The sintering kiln for alumina mobile phone back panel according to claim 1, characterized in that: The organic side shaping block and the organic inner shaping block are formed parts obtained by casting organic slurry and are formed by pressing with a mold.

4. The sintering kiln for alumina mobile phone back panel according to claim 3, characterized in that: The organic slurry for preparing the organic side shaping block and the organic inner shaping block contains the same organic forming agent as that of the green backboard sample.

5. The sintering kiln for alumina mobile phone back panel according to claim 1, characterized in that: When in use, the blank backboard sample is placed on the lower shaping support plate, the organic side shaping block is placed on the side of the blank backboard sample, the organic inner shaping block is placed on the top of the blank backboard sample, and the shaping upper shaping support plate is placed on the organic inner shaping block.

6. The sintering kiln for alumina mobile phone back panel according to claim 1, characterized in that: The size of the shaping upper support plate is smaller than the size of the organic inner shaping block, and is smaller than the plane size of the blank back plate sample after debinding and sintering.

7. The sintering kiln for alumina mobile phone back panel according to claim 1, characterized in that: The surface where the shaping lower support plate and the organic inner shaping block contact the blank backing plate sample is completely consistent with the shape of the sample surface.

8. The sintering kiln for alumina mobile phone back panel according to claim 7, characterized in that: In ordinary mobile phone back panels and 2.5D mobile phone back panels, the surfaces where the shaping lower support plate and the organic inner shaping block contact with the blank back panel sample are flat.

9. The sintering kiln for forming the alumina mobile phone back plate according to claim 7, characterized in that: In the 3D mobile phone back panel, the surfaces where the shaping lower support plate and the organic inner shaping block contact with the blank back panel sample are curved surfaces.

10. The sintering kiln for alumina mobile phone back panel according to claim 1, characterized in that: For ordinary mobile phone back panels, the organic side molding blocks and the organic inner molding blocks are omitted when used.

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