CN114956868B

CN114956868B - Ceramic shell, preparation method and electronic equipment

Info

Publication number: CN114956868B
Application number: CN202110221374.6A
Authority: CN
Inventors: 张文宇
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-02-27
Filing date: 2021-02-27
Publication date: 2024-04-02
Anticipated expiration: 2041-02-27
Also published as: CN114956868A

Abstract

The application provides a ceramic shell, comprising: a ceramic matrix; the fiber resin reinforcing layer is arranged on one side surface of the ceramic matrix; wherein the average axial thermal expansion coefficient of the fiber-resin reinforcing layer is smaller than the thermal expansion coefficient of the ceramic matrix in a temperature range of 0 ℃ to 150 ℃. Also provided are a method for preparing the ceramic shell and electronic equipment.

Description

Ceramic shell, preparation method and electronic equipment

Technical Field

The application relates to the technical field of electronics, in particular to a ceramic shell, a preparation method and electronic equipment.

Background

The ceramics such as zirconia and the like have high hardness, high strength and texture of being warm and moist like jade, and are ideal shell materials of high-end consumer electronic products; however, because the ceramic is heavy, the weight of the whole electronic equipment is increased, and when the thickness of the ceramic shell is thinned to reduce the weight of the whole electronic equipment, the mechanical strength of the ceramic shell cannot meet the requirement, so when the ceramic shell is used, how to enable the thinner ceramic shell to have higher mechanical strength is an urgent problem to be solved in the industry.

Disclosure of Invention

In view of the above, the present application provides a ceramic housing, a manufacturing method, and an electronic device, which have a thinner size and at the same time have higher mechanical strength.

The application provides a ceramic shell, comprising: a ceramic matrix; the fiber resin reinforcing layer is arranged on one side surface of the ceramic matrix; wherein the average axial thermal expansion coefficient of the fiber-resin reinforcing layer is smaller than the thermal expansion coefficient of the ceramic matrix in a temperature range of 0 ℃ to 150 ℃.

The application also provides a preparation method of the ceramic shell, which comprises the following steps: providing a ceramic substrate; forming a fiber resin reinforcing layer on one side surface of the ceramic matrix to form the ceramic shell; wherein the average axial thermal expansion coefficient of the fiber-resin reinforcing layer is smaller than the average axial thermal expansion coefficient of the ceramic matrix in a temperature range of 0 ℃ to 150 ℃.

The application also provides electronic equipment, which comprises the ceramic shell or the ceramic shell prepared by the preparation method of the ceramic shell.

In the ceramic shell, the preparation method and the electronic equipment, the fiber resin reinforcing layer is formed on the surface of the ceramic substrate, the fiber resin reinforcing layer has good mechanical strength and toughness, so that the mechanical property of the ceramic substrate can be enhanced, and the average axial thermal expansion coefficient of the fiber resin reinforcing layer is smaller than that of the ceramic substrate in the temperature range of 0-150 ℃, so that the ceramic substrate is far away from the outer surface of the fiber resin reinforcing layer to maintain the compressive stress, the compressive stress can effectively prevent crack expansion, the sensitivity of the ceramic shell to defects is reduced, the falling performance of a shell roller is improved, and the risk of shell cracking in the use process of the electronic equipment can be remarkably reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional view of a ceramic housing according to a first embodiment of the present application.

Fig. 2 is a schematic fiber weave diagram of a fiber-resin reinforced layer according to a first embodiment of the present application.

Fig. 3 is a fiber-cloth laminated diagram of a fiber-resin reinforcing layer according to a first embodiment of the present application.

Fig. 4 is a schematic fiber cloth laminated view of a fiber resin reinforced layer according to a first embodiment of the present application, wherein electromagnetic signal openings are formed on the fiber cloth a.

Fig. 5 is a schematic fiber weaving diagram of a fiber-reinforced resin layer according to a first embodiment of the present application, in which electromagnetic signal avoiding areas are formed on transverse fibers.

Fig. 6 is a schematic flow chart of a method for manufacturing a ceramic shell according to a second embodiment of the present application.

Fig. 7 is a flow chart of a forming method for forming a fiber-resin reinforced layer on a side surface of a ceramic substrate according to a second embodiment of the present application.

Fig. 8 is a flow chart of another method for forming a fiber-resin reinforced layer on a side surface of a ceramic substrate according to a second embodiment of the present application.

Fig. 9 is a flow chart of another method for forming a fiber-resin reinforced layer on a side surface of a ceramic substrate according to a second embodiment of the present application.

Fig. 10 is a flow chart of another method for forming a fiber-resin reinforced layer on a side surface of a ceramic substrate according to a second embodiment of the present application.

Fig. 11 is a schematic top view of an electronic device according to a third embodiment of the present application.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

It should be noted that, for convenience of explanation, in the embodiments of the present application, like reference numerals denote like components, and for brevity, detailed explanation of the like components is omitted in different embodiments.

The first embodiment of the application provides a ceramic shell, which comprises a ceramic matrix and a fiber resin reinforcing layer, wherein the fiber resin reinforcing layer is arranged on one side surface of the ceramic matrix; wherein the average axial thermal expansion coefficient of the fiber-resin reinforcing layer is smaller than the thermal expansion coefficient of the ceramic matrix in a temperature range of 0 ℃ to 150 ℃.

In this application, form the fibre resin enhancement layer on ceramic matrix's surface, fibre resin enhancement layer has better mechanical strength and toughness to can strengthen ceramic matrix's mechanical properties, and because of in 0 ℃ to 150 ℃'s temperature range, the average axial coefficient of thermal expansion of fibre resin enhancement layer is less than ceramic matrix's coefficient of thermal expansion makes ceramic matrix keep away from the surface of fibre resin enhancement layer compressive stress, and this compressive stress can effectively hinder the extension of crackle, reduces the sensitivity of ceramic casing to the defect, improves the casing cylinder and falls the performance, can show the risk that reduces electronic equipment casing fracture in the use.

Referring to fig. 1 to 5, a ceramic housing 100 according to a first embodiment of the present application is provided, where the ceramic housing 100 includes a ceramic substrate 11 and a fiber resin reinforced layer 12, and the fiber resin reinforced layer 12 is disposed on a side surface of the ceramic substrate 11.

In some embodiments, the main component of the ceramic substrate 11 may be at least one of alumina, zirconia, and zirconium nitride; the alumina, zirconia and zirconia ceramics have high strength, high gloss, high fracture toughness, excellent heat insulation performance, high temperature resistance and other properties, and also have low dielectric constant and no shielding signal, so that the ceramic housing 100 of the embodiment is particularly suitable for being used as a structural member or a decoration of electronic equipment, and the structural member or the decoration can be a battery back cover, a middle frame, a camera decoration and the like.

In some embodiments, the ceramic matrix 11 is formed from raw materials comprising ceramic powder and a binder; wherein the ceramic powder is at least one of alumina powder, zirconia powder and zirconium nitride powder.

In some embodiments, the ceramic powder further comprises ingredients such as colorants and stabilizers.

Wherein in some embodiments, the colorant may impart a specific color to the ceramic matrix 11; the pigment can be ferric oxide, cobalt oxide, nickel oxide, zinc oxide, manganese oxide, chromium oxide, silicon oxide, copper oxide, strontium oxide, gallium oxide, rare earth oxide, aluminum oxide, magnesium oxide and calcium oxide or is represented by formula AB ₂ O ₄ At least one of the materials of (a); wherein the chemical formula is AB ₂ O ₄ Wherein A is one or more of zinc (Zn), cobalt (Co), nickel (Ni) and calcium, B is one or more of aluminum (Al), iron (Fe) and manganese (Mn), for example, the chemical formula is AB ₂ O ₄ The material of (C) is cobalt aluminate, nickel aluminate, calcium aluminate, zinc chromate, cobalt chromate, nickel chromate, calcium chromate, zinc ferrite, cobalt ferrite, nickel ferrite, calcium ferrite, zinc manganate, cobalt manganate, nickel manganate, calcium manganate, (Zn, co, ni) (Al, fe, mn) ₂ O ₄ Etc.

In some embodiments, the stabilizer may be yttria, etc., wherein the stabilizer facilitates stability of ceramic crystals, making the ceramic matrix 11 less prone to cracking during sintering and processing.

In some embodiments, the binder may be one or more of paraffin, polyethylene glycol, stearic acid, dioctyl phthalate, polyethylene, polypropylene, polymethyl methacrylate, polyoxymethylene.

In some specific embodiments, the main component of the ceramic powder is zirconia with a tetragonal phase crystal structure, so that dense zirconia ceramic can be formed, and the ceramic powder has the characteristics of high strength toughness, high bending strength, high fracture toughness, good wear resistance, high hardness, low heat conductivity and the like; in general, zirconia ceramics have a coefficient of thermal expansion of 9.8x10 in the temperature range of 0 ℃ to 150 °c ^-6 /℃。

In the application, the average axial thermal expansion coefficient of the fiber resin reinforced layer is smaller than that of the ceramic matrix in the temperature range of 0-150 ℃, so that after the fiber resin reinforced layer is formed on the inner surface of the ceramic matrix, the shrinkage rate of the fiber resin reinforced layer is smaller than that of the ceramic matrix, and the outer surface of the ceramic matrix, which is far away from the fiber resin reinforced layer, is kept under compressive stress; the compressive stress can effectively prevent crack propagation, reduce sensitivity of the ceramic matrix to defects, improve drop performance of the shell roller, and remarkably reduce risk of cracking of the ceramic matrix in the use process of the electronic equipment.

In a preferred embodiment, the difference between the average axial thermal expansion coefficient of the fibrous resin reinforcing layer and the thermal expansion coefficient of the ceramic matrix is greater than 0.1X10 ℃ in the temperature range of 0 ℃ to 150 DEG C ^-6 This difference in average axial thermal expansion coefficient can better enhance the mechanical properties of the ceramic matrix 11.

The above-mentioned temperature range of 0 to 150 ℃ is selected mainly in consideration of the temperature at which the fiber-resin reinforcing layer 12 is formed on the surface of the ceramic base 11, such as the resin curing temperature or the glue layer curing temperature, etc., and generally does not exceed 150 ℃; it will be appreciated that at temperatures above 150 ℃, the average axial coefficient of thermal expansion of the fibrous resin reinforcing layer may still be less than the coefficient of thermal expansion of the ceramic matrix; specifically, for example, in a temperature range of 0 ℃ to 200 ℃, the average axial thermal expansion coefficient of the fiber resin reinforcing layer is smaller than that of the ceramic matrix, and the difference between the average axial thermal expansion coefficient of the fiber resin reinforcing layer and that of the ceramic matrix is larger than 0.1X10 ^-6 In the process of forming the fiber-resin reinforced layer on the surface of the ceramic substrate and in the other process of forming the fiber-resin reinforced layer on the ceramic substrate 11, even if there is a process of higher than 150 ℃, the shrinkage ratio of the fiber-resin reinforced layer can be kept smaller than that of the ceramic substrate, and the outer surface of the ceramic substrate remote from the fiber-resin reinforced layer can be kept under compressive stress.

In some embodiments, the ceramic matrix 11 includes opposing outer and inner surfaces 111, 112, and the fibrous resin reinforcing layer 12 is formed on the inner surface 112 of the ceramic matrix 11; the outer surface 111 of the ceramic substrate 11 is in a compressive stress state, and the compressive stress is greater than or equal to 50 mpa, which can effectively prevent crack propagation and reduce the sensitivity of the ceramic substrate 11 to defects.

In the present application, the fiber-resin reinforcing layer 12 is made of a material including reinforcing fibers and a resin, and specifically, for example, is a fiber cloth impregnated with a resin; the fiber cloth impregnated with the resin is a material formed by impregnating the resin not only on the outer surface of the fiber cloth but also in the internal gaps of the fiber cloth.

In this application, the existence of resin can infiltrate reinforcing fiber, reduces bubble in the fibrous resin enhancement layer 12, and then makes reinforcing fiber can strengthen effectively the mechanical properties of ceramic matrix 11, and reinforcing fiber's existence then can be right ceramic matrix 11 carries out intensity support, and then improves ceramic matrix 11's mechanical properties.

In the present application, the resin may be at least one of epoxy resin, phenolic resin, acrylic resin, or polyurethane resin; the reinforcing fiber may be at least one of an organic fiber, an inorganic nonmetallic fiber, a metallic fiber, or the like. The organic fibers can be kevlar fibers, polyethylene fibers, aramid fibers, polyimide fibers and the like, the inorganic nonmetallic fibers can be carbon fibers or glass fibers and the like, and the metal fibers can be stainless steel fibers or tungsten fibers and the like.

The reinforcing fibers are preferably in the form of a long fiber woven fabric, and may be, for example, a fiber fabric formed by weaving long fibers in a unidirectional, straight-line, twill or satin manner; the reinforcing fibers with different materials can be mixed and layered, namely the same layer of fiber cloth is made of the same material fiber, but the layers are made of different materials fiber; or mixed knitting, namely the same layer of fiber cloth contains fibers of different materials; mixed weave + mixed lay-up may also be present at the same time.

In some embodiments, the resin and reinforcing fibers in the fibrous resin reinforcing layer 12 are both greater than or equal to 30% by volume; this content enables the resin to sufficiently wet the reinforcing fibers and the reinforcing fibers to sufficiently support the ceramic matrix 11, wherein an excessively low resin content may not completely infiltrate the reinforcing resin, may cause more bubbles in the fibrous resin reinforcing layer 12, and may further lower the mechanical strength of the fibrous resin reinforcing layer 12, and an excessively low reinforcing fiber content may cause the fibrous resin reinforcing layer 12 to be insufficient to support the ceramic matrix, and may further lower the mechanical strength of the fibrous resin reinforcing layer 12.

Preferably, the fibrous resin reinforcing layer 12 has a resin volume content of 40% to 60% and reinforcing fibers volume content of 40% to 60%, which may allow the resin to more fully wet the reinforcing fibers and the reinforcing fibers to adequately support the ceramic matrix.

In some embodiments, the fibrous resin reinforcing layer 12 comprises first reinforcing fibers having an average axial coefficient of thermal expansion that is less than the coefficient of thermal expansion of the ceramic matrix 11 and a difference in the average axial coefficient of thermal expansion of the first reinforcing fibers and the coefficient of thermal expansion of the ceramic matrix 11 of greater than 8 x 10 in a temperature range of 0 ℃ to 150 °c ^-6 a/DEG C; the first reinforcing fibers are capable of reducing the average axial thermal expansion coefficient of the entirety of the fiber-resin reinforcing layer 12, thereby making the shrinkage of the fiber-resin reinforcing layer 12 smaller than that of the ceramic matrix, so that the outer surface of the ceramic matrix remote from the fiber-resin reinforcing layer 12 maintains the compressive stress.

In some embodiments, the first reinforcing fiber is at least one of a carbon fiber, a kevlar fiber, a polyethylene fiber, an aramid fiber, a silicon carbide fiber; the average axial thermal expansion coefficients of such fibers over a temperature range of 0 ℃ to 150 ℃ are shown in the following table:

TABLE 1

Fibrous material	Average axial thermal expansion coefficient 10 ^-6 /℃
		Aramid fiber	-6.0
Kevlar fiber	-1.2
		Carbon fiber	-0.6
Silicon carbide fiber	0.3
		Polyethylene fiber	2.2

In some embodiments, the first reinforcing fibers are present in the fibrous resin reinforcing layer in an amount of greater than or equal to 20% by volume; this content ensures a large average axial thermal expansion coefficient of the entirety of the fiber-resin reinforcing layer.

It will be appreciated that the fibers in the fibrous resin reinforcing layer are more preferably all the first reinforcing fibers, thereby better maintaining the compressive stress on the outer surface of the ceramic matrix 11.

Of course, in other embodiments, the fibrous resin reinforcing layer 12 further comprises second reinforcing fibers having an average axial thermal expansion coefficient greater than that of the first reinforcing fibers in a temperature range of 0 ℃ to 150 ℃, and when the average axial thermal expansion coefficient of the second reinforcing fibers is less than that of the ceramic matrix, the difference between the average axial thermal expansion coefficient of the second reinforcing fibers and the thermal expansion coefficient of the ceramic matrix is less than or equal to 8×10 ^-6 a/DEG C; the second reinforcing fiber can also play a role of supporting the ceramic matrix, and the addition of the second reinforcing fiber The manufacturing cost of the ceramic housing 100 can be reduced.

In some embodiments, the second reinforcing fiber may be at least one of glass fiber, basalt fiber, stainless steel fiber, polyimide fiber; the average axial thermal expansion coefficients of such fibers over a temperature range of 0 ℃ to 150 ℃ are shown in the following table:

TABLE 2

Fibrous material	Average axial thermal expansion coefficient 10 ^-6 /℃
		Glass fiber	3.0
Basalt fiber	6.5
		Stainless steel fiber	17.2
Polyimide fiber	20.0

In some embodiments, the fiber-resin reinforced layer 12 includes at least one layer of fiber cloth, and the fiber cloth may be formed by weaving the first reinforcing fiber, or may be formed by weaving the first reinforcing fiber and the second reinforcing fiber in a mixed manner, or may be formed by weaving the second reinforcing fiber.

In some embodiments, for example, the fiber cloth has a plurality of layers, and the fiber resin reinforcing layer 12 includes a first fiber cloth and a second fiber cloth alternately stacked, the first fiber cloth being formed by braiding the first reinforcing fibers, and the second fiber cloth being formed by braiding the second reinforcing fibers.

In other embodiments, for example, as shown in fig. 2, the fiber resin reinforced layer 12 includes at least one layer of a third fiber cloth 125, and the third fiber cloth 125 is formed by weaving the first reinforcing fibers 125a and the second reinforcing fibers 125b in a mixed manner; wherein the first reinforcing fibers 125a and the second reinforcing fibers 125b may be woven along the radial direction and the weft direction of the third fiber cloth, respectively.

In a preferred embodiment, referring to fig. 3, the fiber resin reinforced layer 12 includes a kevlar fiber cloth a, an aramid fiber cloth b, two layers of carbon fiber cloth c, an aramid fiber cloth b and a kevlar fiber cloth a laminated in sequence; more preferably, in the fiber-resin reinforced layer, the volume content of the resin is 60%, and the volume content of the carbon fiber, the kevlar fiber and the aramid fiber is 40% in total; further more preferably, the volume content of the carbon fiber, kevlar fiber and aramid fiber is about 13.3%; further, more preferably, the kevlar fiber cloth and the aramid fiber cloth are both straight-grain fiber cloth, the carbon fiber cloth is uniaxial fiber cloth, the resin is acrylic resin, and the main component of the ceramic matrix is zirconia.

In another preferred embodiment, the fiber-resin reinforcing layer 12 includes four carbon fiber cloths c stacked; wherein, more preferably, in the fiber resin reinforced layer, the volume content of the resin is 55%, and the volume content of the carbon fiber is 45%; further, more preferably, the carbon fiber cloth is a uniaxial fiber cloth, the resin is bisphenol a type epoxy resin, and the main component of the ceramic matrix is zirconia.

The reinforcing fibers in the two preferred embodiments are all first reinforcing fibers, that is, the fibers with smaller average axial thermal expansion coefficients, so that the obtained fiber resin reinforcing layer has better mechanical properties, and the outer surface of the ceramic matrix 11, which is far away from the fiber resin reinforcing layer 12, can maintain larger compressive stress, so that crack propagation can be more effectively blocked, sensitivity of the ceramic matrix to defects is reduced, the dropping performance of the shell drum is improved, and the risk of cracking of the ceramic matrix in the use process of the electronic equipment can be more remarkably reduced.

In some embodiments, the fibrous resin reinforcing layer 12 comprises at least one layer of fibrous cloth comprising electrically conductive reinforcing fibers, such as: the fiber cloth can be formed by weaving conductive reinforcing fibers or mixed weaving of conductive reinforcing fibers and non-conductive reinforcing fibers, and the conductive reinforcing fibers and the non-conductive reinforcing fibers can be one of the first reinforcing fibers and the second reinforcing fibers; wherein, if the ceramic housing 100 is used as a housing of an electronic device, a fenestration area may be provided on the conductive reinforcing fiber in order to prevent shielding of electromagnetic signals by the conductive reinforcing fiber; specifically, for example, if the fiber cloth is formed by weaving conductive reinforcing fibers, a through electromagnetic signal window may be formed on the fiber cloth, and if the fiber cloth is formed by weaving conductive reinforcing fibers and non-conductive reinforcing fibers in a mixed manner, an electromagnetic signal avoiding area is formed on the fiber cloth.

For example, referring to fig. 4, in one embodiment, the fiber cloth formed by knitting the conductive reinforcing fibers is defined as a conductive fiber cloth, the fiber cloth formed by knitting the non-conductive reinforcing fibers is defined as a non-conductive fiber cloth, the fiber resin reinforcing layer 12 includes a conductive fiber cloth a and a non-conductive fiber cloth B alternately stacked, the conductive fiber cloth a is formed by knitting the conductive reinforcing fibers, and the non-conductive fiber cloth B is formed by knitting the non-conductive reinforcing fibers; wherein, each conductive fiber cloth a is formed with a through electromagnetic signal opening 124, and the positions of the electromagnetic signal openings 124 are corresponding, so that the fiber resin reinforced layer 12 as a whole forms an electromagnetic signal window 126 at the position corresponding to each through electromagnetic signal opening 124; it will be appreciated that the alternating stacks described may be replaced by unordered stacks; the number of the through electromagnetic signal openings 124 may be plural, and plural through electromagnetic signal openings 124 may be set according to the antenna position, which is not limited in this application.

For another example, referring to fig. 5, in another embodiment, the fiber resin reinforced layer 12 includes a fiber cloth C formed by weaving conductive-nonconductive fibers in a mixed manner, that is, the fiber cloth C is formed by weaving conductive reinforced fibers C1 and nonconductive reinforced fibers C2 in a mixed manner; the conductive reinforcing fiber C1 is formed with at least one electromagnetic signal avoidance area on the fiber cloth, that is, or the conductive reinforcing fiber C1 is not disposed in the electromagnetic signal avoidance area, so that the position of the fiber cloth corresponding to the electromagnetic signal avoidance area forms the electromagnetic signal windowing 126.

In some embodiments, the thickness of the ceramic substrate 11 may range from 0.1 mm to 0.4 mm, which is much smaller than that of the ceramic substrate of the existing ceramic shell, so that the thickness of the ceramic shell as a whole can be reduced, and the ceramic substrate 11 of the present application is not easily broken even if the thickness is thin due to the support of the fiber resin reinforcing layer 12.

In some embodiments, the thickness of the fiber-reinforced resin layer 12 may range from 0.05 mm to 0.8 mm, which may provide good support for the ceramic matrix 11 without excessive overall thickness of the ceramic shell 100; in a preferred embodiment, the thickness of the fibrous resin reinforcing layer 12 may range from 0.3 mm to 0.6 mm.

In some preferred embodiments, as shown in fig. 1, the ceramic substrate 11 has a curved shape such as 2.5D or 3D, the fiber resin reinforced layer 12 is attached to the inner surface 112, and a receiving cavity 123 is formed on a side of the fiber resin reinforced layer 12 away from the inner surface 112, and the receiving cavity 123 is used for receiving an electronic device or the like.

Referring to fig. 6, a method for preparing a ceramic shell according to a second embodiment of the present application includes the steps of:

S201, providing a ceramic matrix;

s202, forming a fiber resin reinforcing layer on one side surface of the ceramic matrix to form the ceramic shell; wherein the average axial thermal expansion coefficient of the fiber-resin reinforcing layer is smaller than the thermal expansion coefficient of the ceramic matrix in a temperature range of 0 ℃ to 150 ℃.

The ceramic matrix and the fiber resin reinforced layer may be specifically described in the first embodiment of the present application, and will not be described herein.

In some embodiments, referring to fig. 7, the step of forming a fiber resin reinforced layer on one side surface of the ceramic substrate may include:

s2021, providing a cured fiber resin reinforcing layer;

s2022, providing a glue layer; and

And S2023, attaching the fiber resin reinforced layer to one side surface of the ceramic matrix through the adhesive layer.

Wherein the adhesive layer can be glue or adhesive film; specifically, the glue may be epoxy resin, acrylic resin, phenolic resin, polyurethane resin, etc., and the adhesive film may be a hot melt adhesive film, etc.

When the fiber resin reinforced layer is attached to one side surface of the ceramic matrix through glue or adhesive film, the glue or adhesive film is heated and pressurized simultaneously to fully solidify the glue or adhesive film, so that the fiber resin reinforced layer and the ceramic matrix are tightly adhered; in some embodiments, the temperature of the heat and pressure may be between 100 ℃ and 150 ℃ and the pressure may be between 0.1 megapascals and 10 megapascals.

The method of this embodiment is more suitable for bonding the fiber resin reinforced layer on the surface of the planar ceramic substrate, and the generation of bonding bubbles at the corner position of the curved surface R needs to be paid attention to when the method is used for bonding the fiber resin reinforced layer on the surface of the planar ceramic substrate.

In other embodiments, referring to fig. 8, the step of forming a fiber resin reinforced layer on one side surface of the ceramic substrate may include:

s2021a, providing a fiber cloth;

s2022a, paving the fiber on one side surface of the ceramic matrix;

s2023a, coating resin glue solution on the fiber cloth; and

And S2024a, curing the resin glue solution to form resin, and filling and coating the fiber cloth with the resin to form the fiber resin reinforced layer.

Wherein, the material, structure and layer number of the fiber cloth can be specifically described in the foregoing description; and curing the resin glue solution to bond the fiber cloth to one side surface of the ceramic matrix.

The fiber cloth is paved with the resin glue solution, the resin glue solution is uniformly coated, then the fiber cloth impregnated with the resin glue solution is extruded or defoamed in vacuum, and the fiber cloth impregnated with the resin glue solution is heated and pressurized at the same time to fully solidify the resin glue solution to form resin, so that the fiber resin reinforced layer and the ceramic matrix are tightly adhered; in some embodiments, the temperature of the heat and pressure may be between 100 ℃ and 150 ℃ and the pressure may be between 0.1 megapascals and 10 megapascals.

The method of this embodiment is not required for the morphology of the ceramic matrix, and can be applied to adhesion of the fiber resin reinforcing layer on the surface of the planar or curved ceramic matrix.

In other embodiments, referring to fig. 9, the step of forming a fiber resin reinforced layer on one side surface of the ceramic substrate may include:

s2021b, placing the ceramic matrix in a mold;

s2022b, providing a fiber cloth, and paving the fiber cloth on one side surface of the ceramic matrix;

s2023b, injecting resin glue solution into the die, so that the resin glue solution is filled in gaps inside the fiber cloth and formed on the surface of the fiber cloth; and

And S2024b, curing the resin glue solution to form resin, and filling and coating the fiber cloth with the resin to form the fiber resin reinforced layer.

Wherein, the material, structure and layer number of the fiber cloth can be specifically described in the foregoing description; and heating and curing the resin glue solution to bond the fiber cloth to one side surface of the ceramic matrix.

In some embodiments, the temperature of heating may be between 100 ℃ and 150 ℃.

The method of the embodiment has no requirement on the form of the ceramic matrix, can be suitable for bonding the fiber resin reinforced layer on the surface of the ceramic matrix with a plane or a curved surface, and has the advantages of good processing dimensional precision, low porosity and good surface finish of the obtained fiber resin reinforced layer.

In other embodiments, referring to fig. 10, the step of forming a fiber resin reinforced layer on one side surface of the ceramic substrate may include:

s2021c, providing a semi-cured fiber resin reinforced layer, and arranging the semi-cured fiber resin reinforced layer on one side surface of the ceramic matrix;

and S2022c, curing the semi-cured resin in the fiber resin reinforced layer, thereby bonding the fiber resin reinforced layer to one side surface of the ceramic substrate through the resin.

In some embodiments, the semi-cured resin in the fibrous resin reinforcement layer may be cured by heat and pressure, which may be at a temperature between 100 ℃ and 150 ℃ and a pressure between 0.1 megapascals and 10 megapascals.

It should be noted that, the method of this embodiment is more suitable for bonding the fiber resin reinforced layer on the surface of the planar ceramic substrate, and when the method is used for the surface of the ceramic substrate with a curved surface structure, care needs to be taken to set the corner position of the curved surface R corresponding to the pressing jig to be a curved surface.

In some embodiments, the fibrous resin reinforcing layer comprises at least one layer of fibrous cloth comprising electrically conductive reinforcing fibers, such as: the fiber cloth can be formed by weaving conductive reinforcing fibers, and can also be formed by weaving conductive reinforcing fibers and non-conductive reinforcing fibers in a mixed mode; wherein, if the ceramic housing is used as a housing of an electronic device, before forming the fiber resin reinforcing layer, in order to prevent shielding of electromagnetic signals by conductive reinforcing fibers, the steps of:

A windowing area is arranged on the conductive reinforced fiber;

specifically, for example, if the fiber cloth is formed by weaving conductive reinforcing fibers, through electromagnetic signal openings may be formed on the fiber cloth, and if the fiber cloth is formed by weaving conductive reinforcing fibers and non-conductive reinforcing fibers in a mixed manner, the conductive reinforcing fibers form electromagnetic signal avoidance areas on the fiber cloth.

For example, referring to fig. 4, in one embodiment, the fiber cloth formed by knitting the conductive reinforcing fibers is defined as a conductive fiber cloth, the fiber cloth formed by knitting the non-conductive reinforcing fibers is defined as a non-conductive fiber cloth, the fiber resin reinforcing layer 12 includes a conductive fiber cloth a and a non-conductive fiber cloth B alternately stacked, the conductive fiber cloth a is formed by knitting the conductive reinforcing fibers, and the non-conductive fiber cloth B is formed by knitting the non-conductive reinforcing fibers; before the conductive fiber cloth a is formed on the surface of the ceramic substrate, a through electromagnetic signal opening 124 is formed on each conductive fiber cloth a, and the positions of the electromagnetic signal openings 124 are corresponding, so that the formed fiber resin reinforced layer 12 as a whole forms an electromagnetic signal opening 126 at the position corresponding to each through electromagnetic signal opening 124; it will be appreciated that the alternating stack described may be replaced by a random stack, i.e. the present embodiment does not require a stack; the number of the through electromagnetic signal openings 124 may be plural, and the plural through electromagnetic signal openings 124 may be distributed in an array, or may be distributed according to the antenna position, which is not limited in this application.

For another example, referring to fig. 5, in another embodiment, the fiber resin reinforced layer 12 includes a fiber cloth C formed by weaving conductive-nonconductive fibers in a mixed manner, that is, the fiber cloth C is formed by weaving conductive reinforced fibers C1 and nonconductive reinforced fibers C2 in a mixed manner; when the fiber cloth C is formed, the conductive reinforcing fibers C1 are not disposed in a partial area when the conductive reinforcing fibers C1 are woven, so that at least one electromagnetic signal avoiding area is formed on the fiber cloth C1, and an electromagnetic signal window 126 is formed at a position of the obtained fiber resin reinforcing layer 12 corresponding to the electromagnetic signal avoiding area.

As shown in fig. 11, the third embodiment of the present application further provides an electronic device 300, where the electronic device 300 includes the ceramic housing 100 according to the first embodiment of the present application, or includes a ceramic housing prepared by a method for preparing a ceramic housing according to the second embodiment of the present application.

In some embodiments, the ceramic housing 100 may be, for example, a battery back cover of the electronic device 300.

In some embodiments, the electronic device 300 is, for example, a smart phone, a notebook, a tablet, a gaming device, or the like portable, mobile computing device, wearable device, or the like.

The ceramic housing of the present case is described below with reference to specific examples.

Example 1

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using 90-degree straight-grain glass fiber cloth with the thickness of 0.08mm as an A layer, using 90-degree straight-grain carbon fiber cloth with the thickness of 0.08mm as a B layer, and paving each fiber cloth layer on one side surface of the ceramic matrix in an ABAB mode, wherein 2 layers of each A, B layers are respectively, and the total thickness is 0.32mm; and coating bisphenol A type epoxy resin glue solution on the fiber cloth, and then curing the resin glue solution to form resin, so as to obtain a fiber resin reinforcing layer, thereby forming the ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 55%, the volume content of the glass fiber is 22.5%, and the volume content of the carbon fiber is 22.5%.

The ceramic housing of example 1 was subjected to a fiber resin reinforced layer thermal expansion coefficient test, and the ceramic housing of example 1 was subjected to a surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance test.

Example 2

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using 90-degree straight-grain glass fiber cloth with the thickness of 0.08mm as an A layer, using unidirectional carbon fiber cloth with the thickness of 0.08mm as a B layer, and paving each fiber cloth layer on the ceramic matrix in an AABB (anaerobic-anoxic-oxic) mode Of which A, B layers each have a total thickness of 0.32mm; and coating bisphenol A type epoxy resin glue solution on the fiber cloth, and then curing the resin glue solution to form resin, so as to obtain a fiber resin reinforcing layer, thereby forming the ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 40%, the volume content of the glass fiber is 30%, and the volume content of the carbon fiber is 30%.

The ceramic housing of example 2 was tested for the coefficient of thermal expansion of the fiber resin reinforcement layer, and the ceramic housing of example 2 was tested for surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance.

Example 3

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using a fiber cloth formed by mixed weaving of 90-degree straight glass fibers and carbon fibers with the thickness of 0.08mm as a layer A, and paving each fiber cloth layer on one side surface of the ceramic matrix in an AAAA mode, wherein the total thickness of 4 layers is 0.32mm; filling bisphenol A type epoxy resin glue solution on and in the fiber cloth in an injection molding mode, and then curing the resin glue solution to form resin, so as to obtain a fiber resin reinforcing layer, thereby forming the ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 65%, the volume content of the glass fiber is 17.5%, and the volume content of the carbon fiber is 17.5%.

The ceramic housing of example 3 was subjected to a fiber resin reinforced layer thermal expansion coefficient test, and the ceramic housing of example 3 was subjected to a surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance test.

Example 4

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using a fiber cloth formed by mixed weaving of 90-degree straight glass with the thickness of 0.08mm and carbon fibers as a layer A, wherein the glass fibers and the carbon fibers are in cross weaving, using a 45-degree diagonal glass fiber cloth with the thickness of 0.08mm as a layer B, and paving each fiber cloth layer on one side surface of the ceramic matrix in an ABAB mode, wherein 2 layers of each A, B layer are respectively, and the total thickness is 0.32mm; by injection mouldingAnd filling bisphenol A type epoxy resin glue solution on and in the fiber cloth, and then curing the resin glue solution to form resin, so as to obtain a fiber resin reinforced layer, thereby forming the ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 30%, the volume content of the glass fiber is 52.5%, and the volume content of the carbon fiber is 17.5%.

The ceramic housing of example 4 was tested for the coefficient of thermal expansion of the fiber resin reinforcement layer, and the ceramic housing of example 4 was tested for surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance.

Example 5

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using 45-degree twill glass with the thickness of 0.08mm and carbon fiber mixed weaving to form fiber cloth as a layer A, using 45-degree twill carbon fiber cloth with the thickness of 0.08mm as a layer B, and paving each fiber cloth layer on one side surface of the ceramic matrix in an ABAB mode, wherein 2 layers of each fiber cloth layer are A, B, and the total thickness is 0.32mm; and coating bisphenol A type epoxy resin glue solution on the fiber cloth, and then curing the resin glue solution to form resin, so as to obtain a fiber resin reinforcing layer, thereby forming the ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 70%, the volume content of the glass fiber is 7.5%, and the volume content of the carbon fiber is 22.5%.

The ceramic housing of example 5 was tested for the coefficient of thermal expansion of the fiber resin reinforcement, and the ceramic housing of example 5 was tested for surface stress, fracture toughness, steel ball impact resistance, and roll drop resistance.

Example 6

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using 90-degree straight-grain glass fiber cloth with the thickness of 0.08mm as an A layer, using 90-degree straight-grain aramid fiber cloth with the thickness of 0.08mm as a B layer, and paving each fiber cloth layer on one side surface of the ceramic matrix in an ABBB mode, wherein the total thickness of the A layer is 1 layer, the B layer is 3 layers, and the total thickness is 0.32mm; coating phenolic resin glue solution on the fiber cloth, and then curing the resin glue solution to form resin to obtain a fiber resin reinforced layer Thereby forming a ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 55%, the volume content of the glass fiber is 11.25%, and the volume content of the aramid fiber is 33.75%.

The ceramic housing of example 6 was tested for the coefficient of thermal expansion of the fiber resin reinforcement, and the ceramic housing of example 6 was tested for surface stress, fracture toughness, steel ball impact resistance, and roll drop resistance.

Example 7

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using 90-degree straight-grain Kevlar fiber cloth with the thickness of 0.1mm as a layer A, using 90-degree straight-grain aramid fiber cloth with the thickness of 0.1mm as a layer B, using 0.1-mm uniaxial carbon fiber cloth as a layer C, paving the fiber cloth layers in an ABCCBA mode, impregnating acrylic resin, and curing to obtain a fiber resin reinforcing layer, wherein the total thickness of the fiber cloth layers is 0.60mm, namely, a layer A layer 2, a layer B layer 2 and a layer C layer 2; and pasting the fiber resin reinforced layer on one side surface of the ceramic matrix through epoxy resin glue, and curing the glue so as to form the ceramic shell. In the fiber resin reinforced layer, the volume content of the resin is 60%, the volume content of the Kevlar fiber is 13.3%, the volume content of the aramid fiber is 13.3%, and the volume content of the uniaxial carbon fiber is 13.3%.

The ceramic housing of example 7 was tested for the coefficient of thermal expansion of the fiber resin reinforcement layer, and the ceramic housing of example 7 was tested for surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance.

Example 8

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using 90-degree straight-grain carbon fiber cloth with the thickness of 0.08mm as a layer A, wherein a 10 mm-10 mm region at the center position and the upper left corner position of the carbon fiber cloth is free of carbon fibers, namely electromagnetic signal openings are formed, using 90-degree straight-grain glass fiber cloth with the thickness of 0.08mm as a layer B, paving each fiber cloth layer in an ABAB mode, impregnating acrylic resin, and curing to obtain a fiber resin reinforced layer, wherein the fibers are formed byThe total thickness of the cloth is 0.32mm, and the electromagnetic signal opening areas of the carbon fiber cloths are opposite to each other, so that electromagnetic signal windowing is formed at the positions of the fiber resin reinforcing layers corresponding to the electromagnetic signal openings; and pasting the fiber resin reinforced layer on one side surface of the ceramic matrix through epoxy resin glue, and curing the glue so as to form the ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 60 percent, the volume content of the glass fiber is 20 percent, and the volume content of the carbon fiber is 20 percent.

The ceramic housing of example 8 was tested for the coefficient of thermal expansion of the fiber resin reinforcement layer, and the ceramic housing of example 8 was tested for surface stress, fracture toughness, steel ball impact resistance, and roll drop resistance.

Example 9

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using 90-degree straight-grain carbon fiber cloth with the thickness of 0.08mm as an A layer, and paving each fiber cloth layer on one side surface of the ceramic matrix in an AAAA (aluminum-oxygen-alloy) mode, wherein the total thickness of the fiber cloth is 0.32mm; and coating bisphenol A type epoxy resin glue solution on the fiber cloth, and then curing the resin glue solution to form resin, so as to obtain a fiber resin reinforcing layer, thereby forming the ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 55 percent, and the volume content of the carbon fiber is 45 percent.

The ceramic housing of example 9 was tested for the coefficient of thermal expansion of the fiber resin reinforcement layer, and the ceramic housing of example 9 was tested for surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance.

Comparative example 1

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using 90-degree straight-grain glass fiber cloth with the thickness of 0.08mm as an A layer, using 90-degree straight-grain carbon fiber cloth with the thickness of 0.08mm as a B layer, and paving each fiber cloth layer on one side surface of the ceramic matrix in an AAAB mode, wherein the total thickness of the A layer is 0.32mm, and the B layer is 3 layers; coating phenolic resin glue solution on the fiber cloth, then curing the resin glue solution to form resin, obtaining a fiber resin reinforced layer,thereby forming a ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 55%, the volume content of the glass fiber is 33.75%, and the volume content of the carbon fiber is 11.25%.

The ceramic housing of comparative example 1 was subjected to a fiber resin reinforced layer thermal expansion coefficient test, and the ceramic housing of comparative example 1 was subjected to a surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance.

Comparative example 2

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using 90-degree straight-grain glass fiber cloth with the thickness of 0.08mm as an A layer, and paving each fiber cloth layer on one side surface of the ceramic matrix in an AAAA mode, wherein the total thickness of the fiber cloth is 0.32mm; and coating bisphenol A type epoxy resin glue solution on the fiber cloth, and then curing the resin glue solution to form resin, so as to obtain a fiber resin reinforcing layer, thereby forming the ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 55 percent, and the volume content of the glass fiber is 45 percent.

The ceramic housing of comparative example 2 was subjected to a fiber resin reinforced layer thermal expansion coefficient test, and the ceramic housing of comparative example 2 was subjected to a surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance.

Comparative example 3

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using 90-degree straight-grain glass fiber cloth with the thickness of 0.08mm as an A layer, using 90-degree straight-grain carbon fiber cloth with the thickness of 0.08mm as a B layer, and paving each fiber cloth layer on one side surface of the ceramic matrix in an ABAB mode, wherein 2 layers of A, B layers are respectively arranged, and the total thickness of the fiber cloth is 0.32mm; and coating bisphenol A type epoxy resin glue solution on the fiber cloth, and then curing the resin glue solution to form resin, so as to obtain a fiber resin reinforcing layer, thereby forming the ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 25%, the volume content of the glass fiber is 37.5%, and the volume content of the carbon fiber is 37.5%.

The ceramic housing of comparative example 3 was subjected to a fiber resin reinforced layer thermal expansion coefficient test, and the ceramic housing of comparative example 3 was subjected to a surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance.

Comparative example 4

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the Using a fiber cloth formed by mixed weaving of 90-degree straight-grain glass fibers and carbon fibers with the thickness of 0.08mm as an A layer, using a uniaxial carbon fiber cloth with the thickness of 0.08mm as a B layer, and paving each fiber cloth layer on one side surface of the ceramic matrix in an ABBB mode, wherein the total thickness of the A layer is 1 layer, the B layer is 3 layers, and the total thickness of the fiber cloth is 0.32mm; filling bisphenol A type epoxy resin glue solution on and in the fiber cloth in an injection molding mode, and then curing the resin glue solution to form resin, so as to obtain a fiber resin reinforcing layer, thereby forming the ceramic shell. Wherein, in the fiber resin reinforced layer, the volume content of the resin is 75%, the volume content of the glass fiber is 3.1%, and the volume content of the carbon fiber is 21.9%.

The ceramic housing of comparative example 4 was subjected to a fiber resin reinforced layer thermal expansion coefficient test, and the ceramic housing of comparative example 4 was subjected to a surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance.

Comparative example 5

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.3mm and is made of black 2.5Y-ZrO ₂ The method comprises the steps of carrying out a first treatment on the surface of the The surface of the ceramic matrix is not provided with a fiber resin reinforcing layer.

The ceramic housing of comparative example 5 was subjected to a fiber resin reinforced layer thermal expansion coefficient test, and the ceramic housing of comparative example 5 was subjected to a surface stress, fracture toughness, steel ball impact resistance, and roll drop resistance test.

Comparative example 6

Providing a ceramic matrix which is in a curved surface shape, has the thickness of 0.5mm and is made of black 2.5Y-ZrO 2 ₂ The method comprises the steps of carrying out a first treatment on the surface of the The surface of the ceramic matrix is not provided with a fiber resin reinforcing layer.

The ceramic housing of comparative example 6 was subjected to a fiber resin reinforced layer thermal expansion coefficient test, and the ceramic housing of comparative example 6 was subjected to a surface stress, fracture toughness, steel ball impact resistance, and barrel drop resistance.

The test results are shown in the following table:

TABLE 3 Table 3

The method for testing the thermal expansion coefficient of the fiber resin reinforced layer comprises the following steps: the test is carried out by referring to GBT 2572-2005-fiber reinforced plastic average linear expansion coefficient test method, and the test temperature is in the range of 0-150 ℃.

As in the previous embodiment, the surface of the ceramic substrate away from the fiber resin reinforced layer is defined as the outer surface, and the surface stress test method is as follows: the stress of the outer surface of the ceramic shell was measured using a model D8 DISCOVER With GADDS X-ray stress analyzer (test method sin2 ψ) from BRUKER corporation, germany; and selecting 5 test points for each sample, wherein the interval between each test point is larger than 1cm, and taking the average value of the stress values of the 5 test points to obtain the surface stress value of the sample. The test depth ranges from about 0 to about 10 microns. Wherein, the test result is that a positive value represents tensile stress and a negative value represents compressive stress.

The fracture toughness test method comprises the following steps: the ceramic shell was tested for fracture toughness using a vickers hardness tester, the indenter was a vickers hardness tester universal standard indenter (a square pyramid indenter made of diamond with 136 degrees included angle on opposite sides), the load was 10Kg, and the dwell time was 30s. Selecting 5 test points for each sample, wherein the interval between the test points is more than 1cm; the pressing head is pressed into the ceramic to leave an indentation, c is the half length of an indentation crack, a is the half length of the indentation, P is the pressing head load, and K _IC For fracture toughness values, the fracture toughness value, then,

/>

k of 5 test points _IC Taking the average value to obtain the sampleFracture toughness, among other things, is a measure of the ability of a ceramic to resist crack propagation, with higher values being less prone to cracking of the surface ceramic. The fracture toughness measured is related to the toughness of the ceramic material and the stress state of the ceramic surface, and if the ceramic surface is tensile, the crack is easier to expand, and the measured K is higher than the measured K _IC Will be lower, if the ceramic surface is compressive stress, the crack will not easily propagate, the measured K _IC Will be higher.

The impact strength of the ceramic shell is judged by using steel ball impact; the test method of the steel ball impact comprises the following steps: the ceramic shell is placed in the hollow jig, the steel ball is smashed to the ceramic center position by free falling at a certain initial height, the weight of the steel ball is 30g, each height is measured for five times, if the ceramic shell is not broken, the height is increased by 5cm and is continuously measured until the shell is broken, and the height when the shell is broken is reduced by 5cm as a test result.

The roller drop test method comprises the following steps: the ceramic shell is arranged on a commercially available mobile phone, the weight of the mobile phone is about 180g, and then the mobile phone is placed into roller dropping equipment for testing; test methods refer to GBT 2423.8-1995 electrical and electronic product environmental test part 2: test method test Ed: appendix a in free fall; and taking out the mobile phone to check the shell after 5 circles of test, if the shell is intact, continuing the test until the shell is broken, and taking the number of circles when the shell is broken minus 5 circles as a test result.

Comparing the foregoing examples 1 to 9 and comparative examples 1 to 6, it can be seen that each of examples 1 to 9 exhibits higher fracture toughness and roller drop strength.

In comparative example 1, the volume content of the first reinforcing fibers in the fiber resin reinforcing layer is less than 15% compared with the first reinforcing fibers with the ceramic shell with the thermal expansion coefficient of more than 8 x 10 < -6 >/DEG C, the corresponding outer surface of the ceramic shell is tensile stress, and the corresponding roller drop strength of the ceramic shell is poor.

In comparative example 2, the fiber resin reinforced layer did not contain the first reinforcing fiber having a coefficient of thermal expansion of 8 x 10-6/°c or more than that of the ceramic shell, so that the corresponding ceramic shell had tensile stress on the outer surface and the corresponding ceramic shell had poor roll drop strength.

In comparative example 3, the volume content of the resin in the fiber resin reinforced layer was less than 30%, and the fiber resin reinforced layer had more bubbles due to insufficient wetting of the reinforcing fibers due to the excessively low resin content, and the roll drop strength corresponding to the ceramic shell was poor.

In contrast, in comparative example 4, the total content of reinforcing fibers in the fibrous resin reinforcing layer was less than 30% by volume, and the roll drop strength of the ceramic shell was poor because the fibrous resin reinforcing layer was insufficient to support the ceramic shell due to the excessively low content of reinforcing fibers.

Further, as can be seen from comparison of the test results of the ceramic housings of examples 1 to 9, several test results of the housings of examples 7 and 9 are all good; because the first reinforcing fibers are used for reinforcement in all of examples 7 and 9, the first reinforcing fibers can reduce the average axial thermal expansion coefficient of the whole fiber resin reinforcing layer, so that the shrinkage rate of the fiber resin reinforcing layer is smaller than that of the ceramic matrix, the outer surface of the ceramic matrix, which is far away from the fiber resin reinforcing layer, is kept in compressive stress, and the mechanical strength of the fiber resin reinforcing layer is improved.

Further, it can be seen from an examination of the surfaces of the ceramic shells of examples 1 to 9 that examples 3 and 4 formed a fiber-reinforced layer by injection molding, and the resulting fiber-reinforced layer had a smoother surface.

Reference herein to "an embodiment," "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or equivalent replaced without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A ceramic shell, comprising:

a ceramic matrix; and

The fiber resin reinforced layer is arranged on one side surface of the ceramic matrix, the fiber resin reinforced layer comprises resin and reinforced fibers, the volume content of the resin in the fiber resin reinforced layer is greater than or equal to 30%, and the volume content of the reinforced fibers is greater than or equal to 30%;

Wherein the average axial thermal expansion coefficient of the fiber-resin reinforcing layer is smaller than the average axial thermal expansion coefficient of the ceramic matrix in a temperature range of 0 ℃ to 150 ℃.

2. The ceramic shell of claim 1, wherein the fibrous resin reinforcing layer has a volume content of the resin of 40% to 60%, and the reinforcing fiber has a volume content of 40% to 60%.

3. The ceramic shell of claim 2 wherein the fibrous resin reinforcing layer comprises first reinforcing fibers having an average axial coefficient of thermal expansion that is less than the coefficient of thermal expansion of the ceramic matrix at a temperature in the range of 0 ℃ to 150 ℃ and a difference in the average axial coefficient of thermal expansion of the first reinforcing fibers and the coefficient of thermal expansion of the ceramic matrix of greater than 8 x 10 ^-6 a/DEG C; the first reinforcing fibers are present in the fibrous resin reinforcing layer in an amount of 20% by volume or more.

4. The ceramic shell of claim 3, wherein the fibrous resin reinforcing layer further comprises second reinforcing fibers having an average axial coefficient of thermal expansion greater than an average axis of the first reinforcing fibers over a temperature range of 0 ℃ to 150 °c A coefficient of thermal expansion in the machine direction, and when the average axial coefficient of thermal expansion of the second reinforcing fibers is less than the coefficient of thermal expansion of the ceramic matrix, the difference between the average axial coefficient of thermal expansion of the second reinforcing fibers and the coefficient of thermal expansion of the ceramic matrix is less than or equal to 8 x 10 ^-6 /℃。

5. The ceramic shell of claim 4, wherein the fibrous resin reinforcing layer comprises a fibrous cloth woven from the first reinforcing fibers, or a mixed woven from the first reinforcing fibers and the second reinforcing fibers, or a fibrous resin reinforcing layer woven from the second reinforcing fibers.

6. The ceramic shell according to claim 5, wherein the fiber cloth is formed by weaving conductive reinforced fibers, and the fiber cloth is provided with through electromagnetic signal openings; or the fiber cloth is formed by mixed weaving of conductive reinforcing fibers and non-conductive reinforcing fibers, and an electromagnetic signal avoiding area is formed on the fiber cloth by the conductive reinforcing fibers; wherein the conductive reinforcing fiber and the non-conductive reinforcing fiber are one of the first reinforcing fiber and the second reinforcing fiber.

7. The ceramic shell according to claim 6, wherein the fiber resin reinforcing layer includes a plurality of layers of the fiber cloth, defines the fiber cloth formed by braiding the conductive reinforcing fibers as a conductive fiber cloth, defines the fiber cloth formed by braiding the non-conductive reinforcing fibers as a non-conductive fiber cloth, and includes the conductive fiber cloth and the non-conductive fiber cloth alternately laminated or randomly laminated; wherein, each conductive fiber cloth is provided with a through electromagnetic signal opening, and the positions of the electromagnetic signal openings are corresponding.

8. The ceramic shell of claim 3, wherein the first reinforcing fibers comprise carbon fibers, kevlar fibers, and aramid fibers; the fiber resin reinforcing layer comprises a Kevlar fiber cloth, an aramid fiber cloth, two layers of carbon fiber cloth, an aramid fiber cloth and a Kevlar fiber cloth which are sequentially laminated; in the fiber resin reinforced layer, the volume content of the resin is 60%, and the volume content of the carbon fiber, the kevlar fiber and the aramid fiber is approximately 13.3%.

9. The ceramic shell of claim 3, wherein the first reinforcing fibers comprise carbon fibers; the fiber resin reinforced layer comprises four layers of laminated carbon fiber cloth; wherein, in the fiber resin reinforced layer, the volume content of the resin is 55%, and the volume content of the carbon fiber is 45%.

10. The ceramic shell of claim 1, wherein the difference between the average axial thermal expansion coefficient of the fiber-resin reinforcing layer and the average axial thermal expansion coefficient of the ceramic shell is greater than 0.1 x 10 in the temperature range of 0 ℃ to 150 °c ^-6 /℃。

11. The ceramic shell of claim 1, wherein the ceramic matrix includes opposing outer and inner surfaces, the fibrous resin reinforcement layer being formed on the inner surface of the ceramic matrix; the outer surface of the ceramic matrix is in a compressive stress state, and the compressive stress is greater than or equal to 50 megapascals.

12. A method of making a ceramic shell comprising:

providing a ceramic substrate; and

Forming a fiber resin reinforcing layer on one side surface of the ceramic substrate to form the ceramic shell;

13. The method of claim 12, wherein the fibrous resin reinforcing layer has a resin volume content and reinforcing fibers volume content of greater than or equal to 30%.

14. The method of manufacturing a ceramic shell according to claim 12, wherein the fiber resin reinforcing layer includes first reinforcing fibers having an average axial thermal expansion coefficient smaller than that of the ceramic matrix at a temperature ranging from 0 ℃ to 150 ℃, and a difference between the average axial thermal expansion coefficient of the first reinforcing fibers and the thermal expansion coefficient of the ceramic matrix is greater than 8 x 10 ^-6 And (c) a volume content of the first reinforcing fibers in the fiber resin reinforcing layer of 20% or more.

15. The method of manufacturing a ceramic shell according to claim 12, wherein the step of forming a fiber resin reinforcing layer on one side surface of the ceramic substrate comprises:

providing a cured fiber resin reinforcing layer;

providing a glue layer; and

Attaching the fiber resin reinforcing layer to one side surface of the ceramic matrix through the adhesive layer;

or alternatively, the first and second heat exchangers may be,

the step of forming a fiber resin reinforcing layer on one side surface of the ceramic substrate comprises the steps of:

providing a fiber cloth;

laying the fiber cloth on one side surface of the ceramic matrix;

filling resin glue solution on and in the fiber cloth; and

Curing the resin glue solution to form resin, wherein the resin fills and coats the fiber cloth to form the fiber resin reinforcing layer, and the resin bonds the fiber cloth to one side surface of the ceramic matrix; wherein, the method for filling the resin glue solution is coating or injection molding;

or alternatively, the first and second heat exchangers may be,

providing a semi-cured fibrous resin reinforcing layer;

and curing the semi-cured resin in the fiber-resin reinforced layer by heating and pressurizing, thereby bonding the fiber-resin reinforced layer to one side surface of the ceramic substrate through the resin.

16. An electronic device comprising the ceramic housing according to any one of claims 1 to 11, or comprising the ceramic housing produced by the method for producing a ceramic housing according to any one of claims 12 to 15.