CN112351121B

CN112351121B - Manufacturing method of ceramic rear cover, ceramic rear cover and mobile terminal

Info

Publication number: CN112351121B
Application number: CN201910732657.XA
Authority: CN
Inventors: 赵岩峰
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2022-03-15
Anticipated expiration: 2039-08-09
Also published as: CN112351121A

Abstract

The application relates to a manufacturing method of a ceramic rear cover, the ceramic rear cover and a mobile terminal, wherein the manufacturing method of the ceramic rear cover comprises the following steps: providing ceramic substrate green bodies and ceramic module green bodies of different colors; stacking the ceramic module green body on a ceramic substrate green body to obtain a green body stack; and carrying out isostatic compaction on the green compact lamination to obtain a lamination biscuit, carrying out glue removal or degreasing on the lamination biscuit, sintering the lamination biscuit after glue removal or degreasing to obtain a sintering biscuit, and processing the surface of the sintering biscuit to enable the surface of the ceramic substrate in the sintering biscuit to be smoothly jointed with the surface of the ceramic module. According to the ceramic rear cover manufacturing method, the ceramic rear cover and the mobile terminal, the ceramic rear cover has the striking aesthetic feeling, and meanwhile, the ceramic base material is used as the supporting body of the ceramic module to improve the overall structural strength of the ceramic rear cover, so that the ceramic rear cover has better anti-falling performance and better using effect is maintained.

Description

Manufacturing method of ceramic rear cover, ceramic rear cover and mobile terminal

Technical Field

The application relates to the technical field of mobile terminals, in particular to a manufacturing method of a ceramic rear cover, the ceramic rear cover and the mobile terminal.

Background

The ceramic has the properties of high strength, high gloss, high fracture toughness, excellent heat insulation performance, high temperature resistance and the like, is used as a structural member of a mobile terminal such as a mobile phone, a tablet personal computer and the like, is widely applied to a ceramic rear cover structure such as a rear cover, a middle frame and the like, and is popular with consumers.

However, the color of the rear cover occupying the large surface of the mobile terminal is single, the improvement of the overall appearance texture of the mobile terminal is greatly restricted, and when the multi-color module is adopted to enrich the appearance color, the structure is unstable, and the anti-falling performance during use is influenced.

Disclosure of Invention

The application provides a lid preparation method behind pottery, lid behind pottery and including this lid behind pottery mobile terminal to the surface has multiple different colours coexists and presents the contrast look effect, and lid structure is firm behind the pottery, and intensity is high, and anti falling performance is good.

In one aspect, the present application provides a method for manufacturing a ceramic rear cover, including the following steps:

providing a ceramic substrate green body and a ceramic module green body having a different color than the ceramic substrate green body;

stacking the green ceramic module onto the green ceramic substrate to obtain a green stack;

isostatic pressing the green body laminate to obtain a laminated green body, and forming the ceramic substrate green body into opposite raised regions and recessed regions, wherein surfaces of the ceramic substrate green body corresponding to the raised regions define top surfaces, and a bonding surface is defined where the ceramic module green body is bonded to the recessed regions of the ceramic substrate green body;

carrying out glue removal or degreasing on the laminated biscuit, and sintering the laminated biscuit after glue removal or degreasing to obtain a sintered biscuit, wherein in the sintered biscuit, a part of the structure corresponding to the ceramic substrate green compact forms a ceramic substrate, and a part of the structure corresponding to the ceramic module green compact forms a ceramic module;

and machining the surface of the sintering blank approximately parallel to the top surface so that the surface of the ceramic substrate is smoothly jointed with the surface of the ceramic module.

In one embodiment, the step of isostatically press forming the green stack to obtain a laminated green body comprises:

providing a die with a boss or a groove;

placing the green stack on the mold such that a portion of the structure of the green stack covers the lands or grooves;

isostatic pressing the green stack to obtain a laminated green body.

In one embodiment, the step of machining the surface of the sintered compact substantially parallel to the top surface comprises grinding or CNC machining the surface of the sintered compact from the side of the top surface or from the side facing away from the top surface.

In one embodiment, the ceramic substrate has a first surface and a second surface which are opposite to each other, and the first surface and the second surface are both laminated with the ceramic module; the step of machining the surface of the sintered compact substantially parallel to the top surface comprises:

grinding or CNC machining is carried out on the surface of the sintering blank from the side where the first surface is located, so that the surface of the ceramic substrate on the side where the first surface is located is smoothly jointed with the surface of the ceramic module stacked on the first surface;

and performing grinding machining or CNC machining on the surface of the sintering blank from the side of the second surface, so that the surface of the ceramic substrate on the side of the second surface is smoothly jointed with the surface of the ceramic module laminated on the second surface.

In one embodiment, the pressure is controlled to be 120MPa to 200MPa and the temperature is controlled to be 70 ℃ to 100 ℃ in the isostatic pressing process.

In one embodiment, the green ceramic substrate or the green ceramic module is prepared by:

carrying out tape casting on the white or colored ceramic slurry to obtain a tape casting blank;

and carrying out punch forming or cutting according to the size of the ceramic rear cover on the casting blank.

In another aspect, the present application provides a method for manufacturing a ceramic rear cover, including the following steps:

sequentially laminating the ceramic substrate green body and the ceramic module green body on a mold with a boss or a groove, and enabling part of the structure of the ceramic substrate green body to cover the boss or the groove;

isostatic pressing the ceramic module green body and the ceramic substrate green body into a whole, and enabling the ceramic substrate green body to form a raised area and a recessed area which are opposite to each other, wherein the surface of the ceramic substrate green body corresponding to the raised area defines a top surface, and a joint surface is defined by combining the ceramic module green body and the recessed area of the ceramic substrate green body;

carrying out glue removal or degreasing on the ceramic module green compact and the ceramic substrate green compact which are isostatic-pressed and integrated, and sintering after glue removal or degreasing to obtain a sintered compact, wherein in the sintered compact, part of the structure corresponding to the ceramic substrate green compact forms a ceramic substrate, and part of the structure corresponding to the ceramic module green compact forms a ceramic module;

In another aspect, the present application provides a ceramic rear cover formed by the above method for manufacturing a ceramic rear cover.

In another aspect, the present application provides a ceramic rear cover, including a ceramic substrate and a ceramic module having a different color from the ceramic substrate, the ceramic substrate has a first surface and a second surface opposite to each other, the first surface of the ceramic substrate has a boss, the ceramic module is stacked on the first surface of the ceramic substrate, and one side of the ceramic module, which faces away from the first surface, is in smooth engagement with one side of the boss, which faces away from the first surface.

In one embodiment, a recessed area is formed on one side of the second surface of the ceramic substrate, and the ceramic module is filled in the recessed area.

In yet another aspect, the present application provides a housing comprising a bezel and a ceramic back cover as described above, the bezel and the ceramic back cover being integrally formed.

In another aspect, the present application provides a mobile terminal including the ceramic rear cover described above or the housing described above.

The utility model provides a lid behind lid preparation method, lid and mobile terminal behind pottery, the ceramic substrate who takes different colours and the ceramic module surface form of joining provide the lid behind the pottery that has the effect of colliding with the look for the whole outward appearance effect of lid behind the pottery is comparatively abundant, and utilizes ceramic substrate to improve lid overall structure intensity behind the pottery as the supporting body of ceramic module, has the anti performance of falling of preferred, in order to maintain better result of use.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic external surface view of a ceramic rear cover of a mobile terminal according to an embodiment;

FIG. 2 is a schematic cross-sectional view illustrating a ceramic rear cover of a mobile terminal according to an embodiment;

fig. 3 is a schematic cross-sectional view illustrating a ceramic rear cover of a mobile terminal according to another embodiment;

fig. 4 is a schematic cross-sectional view illustrating a ceramic rear cover of a mobile terminal according to still another embodiment;

fig. 5 is a schematic cross-sectional view illustrating a ceramic rear cover of a mobile terminal according to yet another embodiment;

fig. 6 is a schematic external surface view of a ceramic rear cover of a mobile terminal according to another embodiment;

fig. 7 is a schematic external surface view of a ceramic rear cover of a mobile terminal according to still another embodiment;

FIG. 8 is a flowchart illustrating steps of a method for manufacturing a ceramic rear cover of a mobile terminal according to an embodiment;

FIG. 9 is a schematic illustration of a layer structure of a green stack formed during a method of making a ceramic back cover according to one embodiment;

FIG. 10 is a schematic representation of the layer structure of the green laminate shown in FIG. 9 after isostatic pressing;

FIG. 11 is a flow chart illustrating the processing steps for green ceramic substrates or green ceramic modules in one embodiment;

FIG. 12 is a flowchart illustrating the method steps for obtaining a laminated green body in a method for fabricating a ceramic back cover, according to an embodiment;

FIG. 13 is a schematic diagram illustrating the isostatic pressing of a green stack with a mold assist in a method for forming a ceramic back cover according to an embodiment;

FIG. 14 is a diagram illustrating a mold-assisted green stack isostatic pressing process performed in a method of forming a ceramic back cover according to an embodiment;

FIG. 15 is a schematic structural view of a sintered compact obtained in a method of manufacturing a ceramic rear cover according to another embodiment;

fig. 16 is a schematic flowchart illustrating steps of a method for manufacturing a ceramic rear cover of a mobile terminal according to another embodiment;

fig. 17 is a schematic view illustrating a method for manufacturing a ceramic rear cover of a mobile terminal according to another embodiment, in which a ceramic substrate green body and a ceramic module green body are sequentially stacked and placed on a mold;

fig. 18 is a schematic structural diagram of a sintered compact after surface processing in a method for manufacturing a ceramic rear cover of a mobile terminal according to another embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As used herein, a "mobile terminal" refers to a device capable of receiving and/or transmitting communication signals including, but not limited to, devices connected via any one or more of the following:

(1) via wireline connections, such as via Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connections;

(2) via a Wireless interface means such as a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter.

A mobile terminal arranged to communicate over a wireless interface may be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:

(1) satellite or cellular telephones;

(2) personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities;

(3) radiotelephones, pagers, internet/intranet access, Web browsers, notebooks, calendars, Personal Digital Assistants (PDAs) equipped with Global Positioning System (GPS) receivers;

(4) conventional laptop and/or palmtop receivers;

(5) conventional laptop and/or palmtop radiotelephone transceivers, and the like.

Referring to fig. 1 and 2, in one embodiment of the present application, a ceramic back cover is provided, which includes a ceramic substrate 10 and a ceramic module 20. The ceramic substrate 10 has a first surface 11 and a second surface 12 disposed opposite to each other, and the first surface 11 and the second surface 12 can be considered as surfaces of two opposite sides of the ceramic substrate 10 in a thickness direction (i.e., an X direction shown in fig. 2) of the ceramic back cover when the ceramic substrate 10 is formed on the ceramic back cover.

The first surface 11 of the ceramic substrate 10 has a projection 11a, and the ceramic module 20 is stacked on the first surface 11 of the ceramic substrate 10. As shown in fig. 2, a side 21 of the ceramic module 20 facing away from the first surface 11 is smoothly joined to a side 11b of the boss 11a facing away from the second surface 12, so that the smoothly joined surface can be used as an outer surface of the ceramic back cover.

In one embodiment, the ceramic module 20 and the ceramic substrate 10 are different in color, so that the outer surface formed by the smooth engagement of the ceramic module 20 and the boss 11a can exhibit an appearance effect with different colors. Specifically, since the ceramic substrate 10 and the ceramic module 20 have different colors, the outer surface formed by smoothly combining the ceramic module 20 and the boss 11a can simultaneously present the color of the ceramic module 20 and the color of the ceramic substrate 10, so that the boss 11a and the ceramic module 20 are smoothly combined to form a color collision effect with different colors, thereby improving the overall aesthetic feeling of the ceramic rear cover. In addition, the structural form that the ceramic module 20 is stacked on the ceramic substrate 10 and smoothly joined with the boss 11a of the ceramic substrate 10 not only can realize color collision to achieve a better decorative effect, but also can effectively improve the overall structural strength of the ceramic rear cover formed by the ceramic substrate 10 and the ceramic module 20 because the ceramic substrate 10 can be used as a carrier of the ceramic module 20.

The side of the first surface 11 of the ceramic substrate 10 is used as the outer surface of the ceramic rear cover, so that the outer surface of the ceramic rear cover has better aesthetic feeling only by smoothly joining the ceramic modules 20 on the first surface 11 with the bosses 11a of the ceramic substrate 10 to realize different colors of striking colors. The second surface 12 of the ceramic substrate 10 may be flat or may be jagged. As shown in fig. 3 and 4, the ceramic substrate 10 has a recessed area 11c formed on a side of the second surface 12. The recessed area 11c may be filled with the ceramic module 20, so that the surface of the side of the ceramic back cover facing away from the outer surface is also flat, specifically, the side of the first surface 11 is the outer surface of the ceramic back cover, and the side of the second surface 12 is the outer surface of the ceramic back cover.

When the ceramic modules 20 are disposed in the recessed areas 11c on both the first surface 11 and the second surface 12 of the ceramic substrate 10, the color of the ceramic module 20 stacked on the first surface 11 of the ceramic substrate 10 may be the same as or different from the color of the ceramic module 20 filled in the recessed area 11 c.

When the recessed region 11c is formed on the second surface 12 side of the ceramic substrate 10 and the ceramic module 20 is filled in the recessed region 11c, the surface of the ceramic module 20 and the second surface 12 of the ceramic substrate 10 are smoothly joined, and the color impact effect can be similarly formed on the side surface, that is, the surface exhibiting the color impact effect on the side where the second surface 12 is located can be used as the outer surface of the ceramic rear cover.

In other embodiments, referring to fig. 2, the second surface 12 of the ceramic substrate 10 may be planar. For example, in some embodiments, the second surface 12 of the ceramic substrate 10 may not be a plane, and the second surface 12 of the ceramic substrate 10 includes a plane portion and a curved portion smoothly joined to the plane portion to meet the processing requirements of the curved ceramic back cover, so as to form the effect of presenting a local curved surface in 2.5D or 3D.

In some embodiments, the first surface 11 or the second surface 12 of the ceramic substrate 10 is convex-concave, for example, in the ceramic back cover shown in fig. 5, the first surface 11 of the ceramic substrate 10 has a convex portion 111 and concave portions 112 located at both sides of the convex portion 111 and recessed relatively, and the ceramic modules 20 are stacked and filled in the two concave portions 112, respectively. The side of the first surface 11 of the ceramic rear cover where the ceramic modules 20 with different colors are filled can be provided with a richer color impact effect (see fig. 6).

For convenience of understanding, the color impact effect of the ceramic rear cover having a surface of a plurality of colors in parallel will be described below by taking only the ceramic module 20 in which the ceramic base 10 is white and the concave portions on both sides of the convex portion are filled with red and blue colors, respectively, as an example. Specifically, as shown in fig. 5 and 6, when the ceramic substrate 10 is white, the convex portion 111 on the first surface 11 of the ceramic substrate 10 is white, and the ceramic modules 20 filled with red and blue are stacked in the concave portions 112 on both sides of the convex portion 111, the corresponding regions will be red and blue. Because the surface of ceramic module 20 and the surperficial smooth combination of boss 111 form the surface of lid behind the pottery, thereby also make the surface of lid behind the pottery form red, white and blue striking look concatenation effect, make the color of lid behind the pottery richer, promote the whole aesthetic feeling of lid behind the pottery, and under this mode, because the ceramic module 20 of convex part 111 both sides all overlaps the first surface 11 of establishing at ceramic substrate 10, regard as the carrier with ceramic substrate 10, make the structure of lid behind the pottery that ceramic module 20 and ceramic substrate 10 combine to form more firm, better anti falling performance has.

On the other hand, the application also provides a manufacturing method of the ceramic rear cover with the processed surface having the color impact effect.

Referring to fig. 8 to 10, the method for manufacturing the ceramic rear cover includes the following steps:

step S101 provides a green ceramic substrate 30 and a green ceramic module 40 having a different color from the green ceramic substrate 30.

In step S101, the ceramic substrate green body 30 and the ceramic module green body 40 may be prepared by an upstream manufacturer and further processed by a downstream manufacturer. Or the ceramic substrate green compact 30 and the ceramic module green compact 40 may be formed through streamlined production and directly put into the next processing procedure, so as to improve the processing efficiency and reduce the material transfer cost.

Further, the ceramic substrate green sheet 30 and the ceramic module green sheet 40 may be prepared by the following steps. Referring to fig. 11, a green ceramic substrate 30 or a green ceramic module 40 is prepared by the steps of:

step S101A, casting the white or colored ceramic slurry to obtain a casting blank.

And step S101B, performing punch forming or cutting on the casting blank according to the size of the ceramic rear cover.

The casting process is to add the ceramic slurry into a hopper of a casting machine and control the thickness of a casting blank formed by casting by using a scraper. For example, in some embodiments, the ceramic slurry is a viscous slurry that can flow after the zirconia powder is fully mixed with the organic binder, plasticizer, and dispersant. The thick liquid adds in the hopper of casting machine to make thick liquid flow out to the conveyer belt from the charge door of hopper, carry the in-process of thick liquid at the transmission band, utilize the scraper to strickle off thick liquid, meanwhile, can control the material thickness of thick liquid after strickleing off on the conveyer belt through the scraper, and carry out the drying back through drying devices such as drying furnace, obtain the curtain coating body.

Furthermore, the materials of the green ceramic substrate 30 and the green ceramic module 40 may vary depending on the color requirements. Taking the ceramic substrate green compact 30 as white as an example, the white zirconia ceramic material composition is uniformly mixed with a dispersant and a binder in a ball mill to obtain a ceramic slurry for manufacturing the white ceramic substrate 10. The dispersing agent is at least one of polyacrylic acid, polyethylene glycol and glycerol, and the binder is at least one of PVB, DOP and DBP. The white zirconia ceramic material composition is as follows: 0 to 0.25 wt% of alumina, 1 to 5 wt% of yttrium oxide, and the balance of hafnium oxide-containing zirconium oxide and other trace impurities. Wherein the white zirconia ceramic material composition is powder, the particle size of the powder D50 is 0.1-20 μm, and the mass ratio of the white ceramic material composition to the dispersant and the binder is 50: 3: 1, so as to form the ceramic substrate 10 with more stable structural mechanical property, and meet the structural strength design requirement of the ceramic substrate 10. Of course, the ceramic module green body 40 may also take the form of the ceramic substrate green body 30 described above to obtain a ceramic slurry for making the white ceramic module 20.

Of course, different metal oxides can be adopted so that the formed ceramic slurry can be suitable for the manufacturing requirements of ceramic components with different colors. For example, the ceramic substrate 10 or the ceramic module 20 having a color effect is manufactured by using color powder. The colored powder can comprise white zirconia, yttria, alumina and a colorant, wherein the white zirconia accounts for 90-99% of the total weight, the yttria accounts for 1-5% of the total weight, the alumina accounts for 0.1-3% of the total weight, and the colorant accounts for 0.8-8% of the total weight. The colorant is used for coloring white zirconia, and can be one or more of erbium oxide, neodymium oxide, praseodymium oxide, cerium oxide, ferric oxide, chromium oxide, manganese oxide, zinc oxide, magnesium, silicon, calcium, cobalt, nickel, copper, vanadium, cadmium, tin and the like. The temperature of the two ball milling methods is controlled below 30 ℃, and the milling time is controlled to be 45-58 hours.

In some embodiments, ceramic slurry for forming the ceramic base material 10 or the ceramic module 20 with different colors is prepared by mixing materials with different colors, and the ceramic slurry is subjected to vacuum degassing and viscosity adjustment, and then the treated ceramic slurry is subjected to tape casting in a tape casting machine, and tape casting process parameters are adjusted to obtain a tape casting blank with the thickness of 0.1-1.0 mm; the parameters of the ceramic slurry for vacuum defoaming treatment are as follows: vacuum defoaming is carried out in a vacuum sealed stirring tank with the vacuum degree of-0.95 Mpa, the stirring speed is 80-120 r/m, and the stirring time is 15-30 min. The ceramic slurry prepared in this way is more delicate, so that the ceramic slurry has better structural strength and color saturation when structures such as the ceramic substrate 10 or the ceramic module 20 are formed in subsequent processing, and the overall aesthetic feeling of the ceramic rear cover is effectively improved.

Step S102, the ceramic module green compact 40 is stacked on the ceramic substrate green compact 30 to obtain a green compact stack.

Step S103, isostatic pressing the green stack to obtain a green laminate, and forming the ceramic substrate green body 30 into the opposing raised regions 31 and recessed regions 32.

Referring to fig. 10, after isostatic compaction, the green ceramic substrate 30 and the green ceramic module 40 of the stacked green body are shaped. The surface of the green ceramic substrate 30 corresponding to the raised region 31 defines a top surface 31a, and the junction of the green ceramic module 40 and the recessed region 32 of the green ceramic substrate 30 defines a junction surface 32 a.

In some embodiments, as shown in fig. 12 and 13, the step S103 of performing isostatic pressing on the green compact stack to obtain the stacked green compact includes:

step S103A, a mold 50 having a boss 51 or a groove is provided.

The shape of the projection 51 or the groove on the mold 50 is not limited, and may be a long strip, a circle, or other shapes. As shown in fig. 14, when the mold 50 is used as a support for isostatic pressing of a green laminate, the convex regions 31 and the concave regions 32 conforming to the shape of the lands 51 are formed on the green laminate subjected to isostatic pressing. In some embodiments, when the projections on the mold 50 are in the shape of strips and are inclined with respect to the surface of the mold 50 carrying the green stack, the isostatic pressed green stack will also form the inclined raised areas 31, and further when the ceramic rear cover is formed by subsequent processing, the color bump on the ceramic rear cover can form inclined lines (see fig. 7).

It can be understood that when the projections or the grooves on the mold 50 take other forms, the mold 50 is used for isostatic pressing to process the green laminates to form a laminated biscuit, and finally the ceramic rear cover with different color impact texture effects can be adapted.

Step S103B, the green laminate is placed in the mold 50 such that part of the structure of the green laminate covers the lands 51 or grooves.

Step S103C, isostatic pressing the green stack to obtain a laminated green body.

In the green lamination, the ceramic module green body 40 is stacked on the ceramic substrate green body 30, for example, as shown in fig. 15, the first surface 30a and the second surface 30b of the ceramic substrate green body 30 are respectively covered with the ceramic module green bodies 40, the green lamination is placed in the mold 50, and when part of the structure of the green lamination covers the boss or the groove, the green lamination can be adapted to form the boss or the groove corresponding to the boss or the groove to form the convex-concave shape through isostatic pressing, that is, in the obtained stacked green body, the convex-concave structure formed by the ceramic substrate green body 30 through the isostatic pressing can be effectively embedded with the ceramic module green body 40, and further, the ceramic substrate green body 30 can be used as a carrier to improve the bonding force with the ceramic module green body 40.

And step S104, carrying out glue removal or degreasing on the laminated biscuit, and sintering the laminated biscuit after glue removal or degreasing to obtain a sintered biscuit.

The organic components in the laminated green body can be discharged by de-gumming or degreasing the laminated green body. And (3) placing the laminated biscuit into a glue discharging box for glue discharging or degreasing, wherein the glue discharging or degreasing temperature is controlled to be 300-600 ℃, and the time is controlled to be 0.5-4 h. After the glue is removed or degreased, the product has no problems of distortion, cracking, heterochrosis and the like.

Sintering the de-glued or degreased laminated biscuit at a sintering temperature of 1300 ℃ to 1550 ℃, such as 1300 ℃, 1350 ℃, 1400 ℃, 1450 ℃ or 1550 ℃; the sintering time can be controlled to be 0.5h to 10h, such as 0.5h, 2h, 3h, 4h, 5h, 6h, 7h, 8h, 9h or 10 h. Through the control of the sintering temperature and the sintering time, the sintered blank has better compactness, the binding force between the ceramic module 20 and the ceramic substrate 10 is effectively improved, and the processed ceramic rear cover has stronger structural strength.

In the sintered compact, a part of the structure corresponding to the ceramic substrate green compact 30 forms the ceramic substrate 10, and a part of the structure corresponding to the ceramic module green compact 40 forms the ceramic module 20.

Step S105 is to process the surface of the sintered compact so that the surface of the ceramic base material 10 and the surface of the ceramic module 20 are smoothly joined.

Specifically, in step S105, a surface of the sintered compact that is substantially parallel to the top surface 31a is processed, that is, a surface that is substantially perpendicular to a thickness direction of the sintered compact is processed, and then when the finally obtained ceramic rear cover is applied to a mobile terminal such as a mobile phone or a tablet computer, the processed surface can be exposed to the mobile terminal and constitute a portion of an outer surface of the mobile terminal, and a color impact effect formed after the ceramic rear cover is processed can achieve a good surface decoration effect on the entire mobile terminal.

When the surface of the sintering blank is processed, the surface of one side of the sintering blank can be processed, so that the sintering blank is processed on the surface, the outer surface with the color collision effect formed by different colors is presented, the outer surface refers to the surface of one side exposed when the ceramic rear cover is assembled to the mobile terminal, and is also the surface of one side of elements such as a battery and a mainboard inside the mobile terminal, the outer surface presents the color collision effect formed by different colors, so that the better decorative effect is realized on the outer surface of the mobile terminal, and the integral aesthetic feeling of the mobile terminal is improved.

The ceramic module green sheet 40 and the ceramic substrate green sheet 30 may be laminated green sheets obtained by isostatic pressing of the laminated green sheets, instead of forming the laminated green sheets by lamination in advance. In another embodiment, the ceramic substrate green body 30 and the ceramic module 20 may be sequentially stacked on the isostatic pressing mold 50, that is, the ceramic substrate green body 30 may be first placed on the mold 50, and then the ceramic module green body 40 may be stacked on the ceramic substrate green body 30.

Specifically, the present application further provides another manufacturing method for processing the ceramic rear cover, which is shown in fig. 16 and 17, and the manufacturing method for the ceramic rear cover includes the following steps:

step S201, providing a ceramic base material green body 30 and a ceramic module green body 40 with a color different from that of the ceramic base material green body 30;

step S202, sequentially laminating the ceramic substrate green body 30 and the ceramic module green body 40 on a mold 50 with a boss 51 or a groove, and enabling part of the structure of the ceramic substrate green body 30 to cover the boss 51 or the groove;

step S203, isostatic pressing the ceramic module green body 40 and the ceramic substrate green body 30 into a whole, and forming the ceramic substrate green body 30 into the convex region 31 and the concave region 32 opposite to each other.

In this way, after isostatic pressing, the recessed region 32 formed on the ceramic module green body 40 can still be used as a carrier for carrying the ceramic substrate green body 30 and meet the requirement of the color impact effect of the coexistence of different color machines. Referring to fig. 10, the surface of the green ceramic substrate 30 corresponding to the raised region 31 defines a top surface 31a, and the joint between the green ceramic module 40 and the recessed region 32 of the green ceramic substrate 30 defines a joint surface 32 a.

And step S204, carrying out glue discharging or degreasing on the ceramic module green body 40 and the ceramic substrate green body 30 which are subjected to isostatic pressing and integrated, and sintering after glue discharging or degreasing to obtain a sintered body.

In the sintered compact, the partial structure corresponding to the ceramic substrate green compact 30 forms the ceramic substrate 10, and the partial structure corresponding to the ceramic module green compact 40 forms the ceramic module 20.

In step S205, the surface of the sintered compact substantially parallel to the top surface 31a is processed so that the surface of the ceramic base 10 and the surface of the ceramic module 20 are smoothly joined.

By the manufacturing method of the ceramic rear cover, the ceramic rear cover with different colors and a color collision effect can be manufactured, the ceramic module 20 is combined to the ceramic substrate 10, so that the ceramic substrate 10 is used for providing a stable carrier for the ceramic module 20, and the overall structural strength of the ceramic rear cover is enhanced.

In some embodiments, in the step of machining the surface of the sintered compact that is substantially parallel to the top surface 31a, the surface of the sintered compact is subjected to grinding machining or CNC machining from the side where the top surface 31a is present or from the side facing away from the top surface 31 a. The uneven part of the surface of the sintering blank can be removed through surface processing, for example, CNC processing is adopted to remove the thickness of 0.2 mm-1.0 mm, so as to obtain the ceramic rear cover with a smoother surface. The subsequent polishing treatment can also control the surface removal machining allowance to be 0.05mm, for example, to obtain a rough sample with the flatness of less than 0.1 mm. The thickness of the crude sample is controlled within the range of 0.30 mm-0.65 mm. So that the sintered blank is light and thin after being processed. In addition, the rough sample after surface processing can be processed by plating and other processing modes to obtain the ceramic rear cover with smoother surface.

The number of the ceramic module green sheets 40 may be one, or a plurality of ceramic module green sheets 40 may be arranged according to the actual color impact effect. For example, as shown in FIG. 9, a green ceramic module 40 is stacked on a green ceramic substrate 30 to finally form a green laminate having a two-layer laminate structure. As shown in fig. 15, two ceramic green compact modules are stacked on the upper and lower surfaces of the ceramic base material green compact 30, respectively, to form a green compact stack having a three-layer stack structure.

In other embodiments, there may be a plurality of ceramic substrate green bodies 30 and ceramic module green bodies 40, such that the green stack formed by the stacking arrangement will have a multilayer stack structure.

Further, when the green body lamination formed by the ceramic module green body 40 and the ceramic substrate green body 30 in the stacking manner is greater than or equal to 3 layers, the outermost 2 layers have different colors of the lamination structure, so that the requirement that the surface is processed into a product with different colors and the effect of color contrast can be realized. For example, as shown in fig. 15, the ceramic substrate 10 has a first surface 30a and a second surface 30b opposite to each other, and the first surface 30a and the second surface 30b are both stacked with the ceramic modules 20, that is, in the green stack, the ceramic substrate green 30 is sandwiched between the two ceramic modules 20, and after the processes of isostatic pressing, glue discharging or degreasing, sintering, etc. of the green stack, the ceramic substrate 10 in the sintered blank is stably bonded to the two ceramic modules 20, and further after the sintered blank is subjected to surface processing, the surface of the ceramic substrate 10 is smoothly bonded to the surface of the ceramic module 20, that is, the outer surface of the finally formed ceramic rear cover can have the color of the ceramic substrate 10 and the color of the ceramic module 20 at the same time, so that a color impact effect is obtained. Through this kind of mode, can form different striking effect in ceramic substrate 10's both sides through two ceramic module 20 respectively, can choose for use the striking effect of one side among them as the surface of lid behind the pottery to the outward appearance aesthetic feeling of lid behind abundant pottery.

As shown in fig. 18, if the color of the ceramic substrate 10 is red and the color of the ceramic module 20 on the first surface 11 is blue, the color impact effect of the side of the ceramic rear cover facing the first surface 11 will be blue and red. If the color of the ceramic module 20 on the second surface 12 is yellow, the color impact effect of the ceramic rear cover toward the side of the second surface 12 will be red and yellow. Of course, the color of the ceramic modules 20 on the first surface 11 and the second surface 12 may be the same.

In an embodiment where the ceramic substrate 10 has a first surface 11 and a second surface 12 disposed opposite to each other, and the first surface 11 and the second surface 12 are both stacked with the ceramic module 20, the step of processing the surface of the sintered compact includes:

the surface of the sintered compact is subjected to a grinding process or a CNC process from the side of the first surface 11 so that the surface of the ceramic substrate 10 is smoothly joined to the surface of the ceramic module 20 laminated to the first surface 11 at the side of the first surface 11.

The surface of the sintered compact is subjected to a grinding process or a CNC process from the side of the second surface 12 so that the surface of the ceramic substrate 10 is smoothly joined to the surface of the ceramic module 20 laminated to the second surface 12 at the side of the second surface 12.

After the surface of the sintered compact is processed on the side where the first surface 11 and the second surface 12 are located, both surfaces of the sintered compact in the thickness direction can obtain a color impact effect.

For the sake of understanding, the following description will be made only by taking as an example the case where the first surface 11 and the second surface 12 of the ceramic substrate 10 are respectively provided with ceramic modules 20 of different colors.

Referring to fig. 18, a convex region 101 and a concave region 102 are formed on a side of the first surface 11 of the ceramic substrate 10, a groove 103 opposite to the convex region 101 and a protrusion 104 opposite to the concave region 102 are formed on a side of the second surface 12, and the ceramic module 20 disposed on the side of the first surface 11 is stacked on the first surface 11 and at least partially fills the concave region 102. The ceramic module 20 disposed on the side of the second surface 12 is stacked on the second surface 12 and at least partially filled in the groove 103, and after the side of the first surface 11 of the sintered compact and the side of the second surface 12 are processed, the surface of the ceramic module 20 on the side of the first surface 11 is smoothly combined with the surface of the ceramic substrate 10 corresponding to the convex region 101, so as to form a surface with different colors for color-striking effect. Accordingly, the surface of the ceramic module 20 on the side of the second surface 12 is smoothly combined with the surface of the ceramic substrate 10 corresponding to the boss 104 to form the surface on the other side of the sintered compact, and different colors coexist to realize the effect of color contrast.

In the above embodiment, through the isostatic pressing process, on one hand, the requirement of the processing shape of the ceramic rear cover can be met, for example, the ceramic rear cover is processed into an effect of presenting a local curved surface such as 2.5D or 3D, and the ceramic substrate green body 30 is adaptively made to form the opposite raised area 101 and the recessed area 102, so that the ceramic substrate 10 formed by the subsequent processing has a mutually staggered layered structure in the thickness direction of the ceramic rear cover, and further the ceramic module 20 having a different color from the ceramic substrate can be embedded in the layered structure, and the ceramic substrate 10 is used as a carrier, so that the overall structural strength of the ceramic rear cover is higher while the surface color impact effect is effectively realized, and the ceramic rear cover has better anti-falling performance. On the other hand, the isostatic pressing process can make the combination between each layered structure in the green laminated layer more compact and uniform. Colloquially, the ceramic substrate green body 30 and the ceramic module green body 40 will be pressed together by isostatic pressing, resulting in a higher structural strength of the finally obtained ceramic back cover.

In the isostatic compaction process, the pressure is controlled to be 120 MPa-200 MPa, and the temperature is controlled to be 70-100 ℃.

It should be noted that the pressure and temperature refer to the ambient pressure and stability of the green laminate during the isostatic pressing process. For example, in some embodiments, the green stack placed on the mold 50 is isostatically molded using an isostatic press, the pressure of which is set to 120MPa to 200MPa, and the temperature of which is controlled to 70 ℃ to 100 ℃. In some embodiments, the pressure of the isostatic pressing device is set to be 120MPa, 130MPa, 140MPa, 150MPa, 160MPa, 170MPa, 180MPa, 190MPa or 200MPa, the temperature of the isostatic pressing device is controlled to be 70 ℃, 80 ℃, 90 ℃ or 100 ℃, and the green lamination is subjected to isostatic pressing under the environment, so that the green lamination with a denser layer structure can be obtained, and the overall structural strength of the ceramic rear cover obtained through subsequent processing is effectively improved.

In some embodiments, the resulting ceramic back cover has an average thickness of the green ceramic substrate 30 of 0.1mm to 1.0mm and a total laminate thickness of the sintered compact of the ceramic back cover of 0.5mm to 3.0 mm. Structural aspects of the mold 50: the height difference between the convex region 101 and the concave region 102 formed on the ceramic substrate green sheet 30 is controlled to be 0.1mm to 6.0 mm. After the subsequent processes of isostatic pressing, sintering and the like, the sintered blank formed by combining the ceramic substrate 10 and the ceramic module 20 will also have a protruding structure corresponding to the protruding region 101, and after the surface of the sintered blank is processed subsequently, the surface of the ceramic substrate 10 and the surface of the ceramic module 20 are smoothly joined, so that the surface color collision effect of the ceramic rear cover is realized by utilizing the color difference between the ceramic substrate 10 and the ceramic module 20.

The ceramic rear cover and the ceramic rear cover manufactured by the manufacturing method of the ceramic rear cover can be used for a mobile terminal and used as a shell of the mobile terminal. The housing may also be configured with other structures, such as a bezel, to be suitable for a mobile terminal.

On the basis, the application provides a mobile terminal, which comprises the ceramic rear cover, or comprises the shell.

In the ceramic rear cover, the ceramic substrate 10 provides stable supporting binding force for the ceramic module 20, so that the color impact effect of the ceramic rear cover is improved, and simultaneously, better structural stability is obtained, and the ceramic rear cover has stronger anti-falling performance so as to maintain better using effect. Thereby the mobile terminal of lid also has the above-mentioned advantage that realizes the surface and hit the look effect behind the pottery, and mobile terminal's surface can have abundant effect of hitting the look promptly, promotes mobile terminal's whole aesthetic feeling, and the structure of lid is firm behind the pottery, has the anti nature of falling of preferred, is difficult to because of the structure that drops is impaired to maintain better result of use.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The manufacturing method of the ceramic rear cover is characterized by comprising the following steps of:

2. The method of claim 1, wherein the step of isostatically pressing the green stack to obtain a laminated green body comprises:

providing a die with a boss or a groove;

isostatic pressing the green stack to obtain a laminated green body.

3. The method of claim 1, wherein the step of machining the surface of the sintered compact that is substantially parallel to the top surface comprises grinding or CNC machining the surface of the sintered compact from the side of the top surface or from the side facing away from the top surface.

4. The method for manufacturing the ceramic rear cover according to claim 1, wherein the ceramic substrate has a first surface and a second surface which are opposite to each other, and the ceramic modules are stacked on the first surface and the second surface; the step of machining the surface of the sintered compact substantially parallel to the top surface comprises:

5. The method for manufacturing the ceramic rear cover according to any one of claims 1 to 4, wherein in the isostatic compaction process, the pressure is controlled to be 120MPa to 200MPa, and the temperature is controlled to be 70 ℃ to 100 ℃.

6. The method of manufacturing a ceramic rear cover according to any one of claims 1 to 4, wherein the green ceramic substrate or the green ceramic module is prepared by:

7. The manufacturing method of the ceramic rear cover is characterized by comprising the following steps of:

8. A ceramic rear cover, characterized in that it is formed by the method of manufacturing a ceramic rear cover according to any one of claims 1 to 7.

9. The utility model provides a lid behind pottery, its characterized in that, including ceramic substrate and with the different ceramic module of ceramic substrate colour, ceramic substrate has first surface and the second surface that sets up back to back, ceramic substrate the boss has on one side of first surface place, the ceramic module folds and locates ceramic substrate's first surface, just ceramic module's dorsad one side of first surface with the dorsad of boss one side smooth joint of first surface.

10. The ceramic rear cover according to claim 9, wherein a recessed area is formed on a side of the ceramic substrate where the second surface is located, and the ceramic module is filled in the recessed area.

11. A housing comprising a frame and a ceramic back cover as claimed in any one of claims 8 to 10, the frame being integrally formed with the ceramic back cover.

12. A mobile terminal characterized in that it comprises a ceramic back cover according to any of claims 8 to 10 or a housing according to claim 11.