CN114180961B

CN114180961B - Shell, preparation method thereof and electronic equipment

Info

Publication number: CN114180961B
Application number: CN202010972224.4A
Authority: CN
Inventors: 张文宇; 卢湘武; 侯体波
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2023-04-11
Anticipated expiration: 2040-09-15
Also published as: CN114180961A

Abstract

The application provides a shell, which comprises a ceramic substrate, wherein the ceramic substrate comprises a first area, a second area and a gradual change area positioned between the first area and the second area; the first area presents a first color, the second area presents a second color, and the first area and the second area have color difference; the direction from the first area to the second area is the first direction, the gradual change from the first color to the second color is presented along the gradual change area of the first direction, and the size of the gradual change area in the first direction is larger than 5mm. By arranging the areas with various colors and arranging the gradual change area with gradual transition of the colors between the single color areas, the appearance of the shell is greatly improved, the visual effect of the shell is enriched, and the application of the shell is facilitated; the preparation method of the shell is simple and easy to operate, and industrial production can be realized; the appearance competitiveness and the product expressive force of the electronic equipment with the shell are enhanced.

Description

Shell, preparation method thereof and electronic equipment

Technical Field

The application belongs to the technical field of electronic products, and particularly relates to a shell, a preparation method of the shell and electronic equipment.

Background

The ceramic material has the advantages of high hardness, good toughness, wear resistance and the like, and is often applied to electronic equipment in recent years. Because the ceramic material has a single color, it is important to improve the appearance and meet more diversified requirements.

Disclosure of Invention

In view of this, the present application provides a shell, a method for manufacturing the same, and an electronic device, where the shell presents multiple colors, and an obvious and moderate color gradient region exists between two colors, so as to greatly enrich the appearance of the shell; when the shell is applied to electronic equipment, the visual effect and the appearance competitiveness can be obviously improved.

In a first aspect, the present application provides a housing comprising a ceramic substrate comprising a first region, a second region, and a transition region between the first region and the second region; the first region exhibits a first color, the second region exhibits a second color, and the first region and the second region have a color difference; the direction from the first area to the second area is a first direction, the gradual change area presents gradual change from a first color to a second color along the first direction, and the size of the gradual change area in the first direction is larger than 5mm.

In a second aspect, the present application provides a method of manufacturing a housing, comprising:

providing a first ceramic slurry and a second ceramic slurry, wherein the first ceramic slurry comprises a first ceramic powder, the first ceramic powder comprises a first colorant, the second ceramic powder comprises a second colorant, the mass content of the first colorant in the first ceramic powder is 4-10%, the mass content of the second colorant in the second ceramic powder is 0-2%, and at least one of the first colorant and the second colorant is a non-spinel colorant;

forming the first ceramic slurry and the second ceramic slurry into a ceramic substrate green body, wherein the ceramic substrate green body comprises a first ceramic green body and a second ceramic green body that are spliced, the first ceramic green body is formed from the first ceramic slurry, the second ceramic green body is formed from the second ceramic slurry, and the first ceramic green body and the second ceramic green body have a color difference;

and removing the adhesive from the ceramic substrate green body, sintering to obtain the ceramic substrate, and preparing the shell.

In a third aspect, the present application provides an electronic device, including a housing and a motherboard, the housing including a ceramic substrate, the ceramic substrate including a first region, a second region, and a transition region between the first region and the second region; the first region exhibits a first color, the second region exhibits a second color, and the first region and the second region have a color difference; the direction from the first area to the second area is a first direction, the gradual change area presents gradual change from a first color to a second color along the first direction, and the size of the gradual change area in the first direction is larger than 5mm.

The application provides a shell and a preparation method of the shell, and the shell is provided with areas with various colors, and a gradual change area with gradual transition of colors is arranged between single color areas, so that the appearance of the shell is greatly improved, the visual effect of the shell is enriched, and the shell is more beneficial to application; the preparation method of the shell is simple and easy to operate, and industrial production can be realized; the appearance competitiveness and the product expressive force of the electronic equipment with the shell are enhanced, and the requirements of users can be met.

Drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be described below.

Fig. 1 is a schematic structural diagram of a housing according to an embodiment of the present disclosure.

Fig. 2 is a top view of a housing according to an embodiment of the present disclosure.

Fig. 3 is an external view of a ceramic substrate according to an embodiment of the present disclosure.

Fig. 4 is an external view of a ceramic substrate according to another embodiment of the present disclosure.

Fig. 5 is a flowchart of a method for manufacturing a housing according to an embodiment of the present disclosure.

Fig. 6 is a schematic structural diagram of a green ceramic substrate provided in an embodiment of the present invention, where (a) in fig. 6 is a schematic structural diagram of a first green ceramic substrate, (b) is a schematic structural diagram of a second green ceramic substrate, (c) is a schematic structural diagram of a third green ceramic substrate, (d) is a schematic structural diagram of a fourth green ceramic substrate, (e) is a schematic structural diagram of a fifth green ceramic substrate, (f) is a schematic structural diagram of a sixth green ceramic substrate, (g) is a schematic structural diagram of a seventh green ceramic substrate, (h) is a schematic structural diagram of an eighth green ceramic substrate, and (i) is a schematic structural diagram of a ninth green ceramic substrate.

Description of reference numerals:

a first area-11, a second area-12, a gradual change area-13, a ceramic substrate-10 and a shell-100.

Detailed Description

The following is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications are also considered as the protection scope of the present application.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Further, the present application may repeat reference numerals and/or reference letters in the various examples for simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a housing according to an embodiment of the present disclosure; fig. 2 is a top view of a housing according to an embodiment of the present disclosure. The housing 100 includes a ceramic substrate 10, the ceramic substrate 10 including a first region 11, a second region 12, and a transition region 13 between the first region 11 and the second region 12; the first area 11 presents a first color, the second area 12 presents a second color, and the first area 11 and the second area 12 have a color difference; the direction from the first area 11 to the second area 12 is a first direction, a gradual change from the first color to the second color is presented along a gradual change area 13 in the first direction, and the size of the gradual change area 13 in the first direction is more than 5mm. In this application, through setting up the region that has multiple colour to set up the gradual change district 13 that the colour mitigateed the transition between single colour region, promoted casing 100's outward appearance greatly, richened casing 100's visual effect, more be favorable to its application.

In the present application, the ceramic substrate 10 includes a first region 11, a second region 12, and a gradation region 13, and the first region 11 and the second region 12 have a color difference. It is to be understood that the terms "first," "second," and the like in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. The application can have the region of two single colours, also can have the region of more than two single colours, forms more colorful outward appearance effect. Referring to fig. 3, an appearance of a ceramic substrate according to an embodiment of the present disclosure is schematically shown, in which the ceramic substrate 10 includes a color a region I, a color B region II, and a transition region III therebetween, and dotted lines in fig. 3 are boundary lines of the color a region I, the color B region II, and the transition region III, respectively. Referring to fig. 4, an appearance of a ceramic substrate according to another embodiment of the present disclosure is schematically illustrated, in which the ceramic substrate 10 includes a color a region I, a color B region II, a color C region IV, a transition region III between the color a region and the color B region, and a transition region V between the color B region and the color C region, where dotted lines in fig. 4 are boundary lines between adjacent regions, respectively. In the present embodiment, the first region 11 and the transition region 13 are disposed adjacent to each other, and the second region 12 and the transition region 13 are disposed adjacent to each other. It will be appreciated that the abutment may be provided around or on one side. In one embodiment, the ceramic substrate 10 includes a first region 11 and a second region 12 on opposite sides of a transition region 13. In another embodiment, the ceramic substrate 10 includes a first region 11, a graded region 13 disposed around the first region 11, and a second region 12 disposed around the graded region 13. In yet another embodiment, the ceramic substrate 10 includes a second region 12, a graded region 13 disposed around the second region 12, and a first region 11 disposed around the graded region 13. It is understood that the enclosure may be, but is not limited to, a partial enclosure, a surround, and the like.

In the present application, the first region 11 presents a first color, the second region 12 presents a second color, and the first region 11 and the second region 12 have a color difference. It is understood that the first area 11 or the second area 12 may not be added with a colorant, and the ceramic material is controlled to be colorless and transparent, so that the shell 100 has a partial color change and a partial transparent appearance, and the visual effect is richer.

In the present embodiment, the color difference value between the first region 11 and the second region 12 is greater than 2. The Lab color model is a device-independent color model and is also a color model based on physiological characteristics. The Lab color model consists of three elements, L, a and b. L is used to represent brightness and has a value in the range of 0,100]From pure black to pure white; a represents the range from green to red, with values ranging from-128, 127](ii) a b represents the range from blue to yellow, and the value range is [ -128, 127 ]]. Each color has a Lab value, and the difference between the two colors (color difference value) is represented by Δ E. For example, the first color has an L value of L1, a value of a1, b value of b1, the second color has an L value of L2, a value of a2, b value of b2, then the lightness difference Δ L = | -L1-L2 |, red/green difference Δ a = | -a 1-a2 |, yellow/blue difference Δ b = | -b 1-b2 |, and the color difference Δ E = (Δ L =) between the two colors ² +Δa ² +Δb ² ) ^1/2 . In the present application, the color difference value of the first area 11 and the second area 12 is controlled to be greater than 2, so that the colors of the first area 11 and the second area 12 can be distinguished by human eyes, and the appearance effect of multiple colors is realized. Further, the color difference value of the first area 11 and the second area 12 is greater than 4; furthermore, the color difference value of the first area 11 and the second area 12 is greater than 6, so that a distinct color difference is generated, and a color collision effect is formed.

In the present embodiment, the difference between the average Lab value of the transition region 13 and the Lab value of the first region 11 is greater than 2, and/or the difference between the average Lab value of the transition region 13 and the Lab value of the second region 12 is greater than 2, so that the color of the transition region 13 is clearly different from that of the first region 11 and the second region 12. In an embodiment, the Lab value of the middle point in the transition zone 13 is different from the Lab value of the first zone 11 and/or the second zone 12 by more than 2, wherein the middle point is the point in the transition zone 13 with the same shortest distance to the first zone 11 and the second zone 12.

In the present application, the ceramic substrate 10 has an inner surface and an outer surface disposed opposite to the inner surface. The surface of the ceramic substrate 10 has a first region, a second region, and a gradation region. It is understood that the ceramic substrate 10 has a first region 11, a second region 12 and a transition region 13 on the inner and outer surfaces, and it is also understood that a portion of the inner surface belongs to the first region 11, a portion of the inner surface belongs to the second region 12, and another portion of the inner surface belongs to the transition region 13; a part of the outer surface belongs to the first zone 11, a part of the outer surface belongs to the second zone 12 and another part of the outer surface belongs to the transition zone 13. In one embodiment, the color difference values of the inner surface and the outer surface of the first region 11 and the inside of the ceramic substrate 10 are less than 1, that is, the first region 11 has the first color, and the colors are uniformly distributed without any significant color difference. Further, the color difference value between the inner surface and the outer surface of the first region 11 and the inside of the ceramic substrate 10 is less than 0.5. In another embodiment, the color difference values of the inner surface and the outer surface of the second region 12 and the inside of the ceramic substrate 10 are less than 1, that is, the second region 12 has the second color, and the colors are uniformly distributed without any significant color difference. Further, the color difference value between the inner surface and the outer surface of the second region 12 and the inside of the ceramic substrate 10 is less than 0.5. In yet another embodiment, the color difference values of the first detection point located on the inner surface of the transition region 13, the second detection point located on the outer surface of the transition region 13, and the third detection point located inside the ceramic substrate 10 of the transition region 13 are less than 1. Further, the color difference value is less than 0.5. The first detection point, the second detection point and the third detection point are points on the same line segment with the shortest distance from the inner surface to the outer surface. That is, the gradation region 13 is a gradation of color, and the colors at the corresponding positions of the surface and the inside are not significantly different in color, and the color of the gradation region 13 is a gradation which is uniform as a whole.

In the present embodiment, the first region 11 includes a first colorant. That is, the first region 11 exhibits the first color due to the presence of the first colorant in the first region 11. The first colorant may comprise a colorant of one color that is uniformly distributed in the first region 11; the first colorant may also include a plurality of different colored colorants uniformly distributed in the first region 11. In one embodiment, the first colorant is present in the first region 11 in an amount of 4% to 10% by mass. In the present application, the mechanical strength of the ceramic substrate 10 is prevented from being affected by too high a content of the colorant by controlling the mass content of the first colorant in the first region 11 to be 4% -10%. Further, the mass content of the first colorant in the first region 11 is 4% -8%. Furthermore, the mass content of the first colorant in the first region 11 is 6% -8%, which deepens the color of the first region 11.

In the present embodiment, the second region 12 includes a second colorant. That is, the second region 12, due to the presence of the second colorant, causes the second region 12 to appear a second color. The second colorant may comprise a colorant of one color that is uniformly distributed in the second region 12; the second colorant may also include a plurality of different colored colorants uniformly distributed in the second region 12. Optionally, the second colorant is present in the second region 12 in an amount of 0% to 2% by mass. In one embodiment, the second colorant is present in the second region 12 at a level of 0% to 1% by mass. The size of the transition region 13 in the first direction is thus greater than 10mm. In another embodiment, when the second colorant is present in the second region 12 in an amount of 0% by mass, i.e., in the absence of the second colorant, the second region 12 takes on the color of the ceramic material itself. The size of the transition region 13 in the first direction is thus greater than 15mm. In one embodiment, the first colorant is present in the first region 11 in an amount of 4% to 10% by mass and the second colorant is present in the second region 12 in an amount of 0% by mass, thereby further emphasizing the color of the first colorant in the transition region 13.

In an embodiment of the present application, at least one of the first colorant and the second colorant is a non-spinel colorant. The chemical formula of the spinel structure is AB ₂ O ₄ A is a divalent metal cation, which may be, but is not limited to, mg ²⁺ 、Mn ²⁺ 、Ni ²⁺ 、Zn ² ⁺ 、Co ²⁺ 、Cd ²⁺ 、Cu ²⁺ 、Ca ²⁺ B is a trivalent metal cation, canAt but not limited to Fe ³⁺ 、Cr ³⁺ 、Mn ³⁺ At least one of (1). In the spinel crystal structure, oxygen ions are arranged in cubic close packing, divalent cations are filled in one-eighth of the tetrahedral voids, and trivalent cations are filled in one-half of the octahedral voids. It will be appreciated that the first and second colourants may both be non-spinel colourants, or one may be a non-spinel colourant and the other a spinel colourant, a blend of spinel colourants and non-spinel colourants or no colourants. In an embodiment, the first colorant and the second colorant may be, but are not limited to, at least one selected from the group consisting of iron oxide, cobalt oxide, cerium oxide, cesium oxide, nickel oxide, bismuth oxide, zinc oxide, manganese oxide, chromium oxide, praseodymium oxide, neodymium oxide, strontium oxide, lanthanum oxide, erbium oxide, gallium oxide, silicon oxide, magnesium oxide, calcium oxide, copper oxide, vanadium oxide, tin oxide, titanium oxide, and other compounds having the above cations, respectively. For example, other compounds having the above cations may be, but are not limited to, nickel silicate, vanadium zirconium yellow, chromite, cobalt aluminate, and the like. It will be appreciated that the first and second colorants may also be selected from other colorants not listed above. The first colorant and the second colorant may be the same colorant, but the first ceramic powder and the second ceramic powder may have different mass ratios, may have different color colorants, or may have different colors and different mass ratios.

In an embodiment of the present application, the first colorant has a particle size of 100nm to 2000nm and the second colorant has a particle size of 100nm to 2000nm. Therefore, the color of the ceramic substrate 10 can be uniformly distributed, the greasiness is strong, the visual effect is good, the mutual agglomeration of the coloring agents is avoided, and the mechanical performance of the ceramic substrate 10 is ensured. The first colorant and the second colorant may include a plurality of colorants of different colors, the particle diameters of the colorants of different colors may be the same or different, and the particle diameters of the first colorant and the second colorant may be the same or different. In one embodiment, when the first colorant comprises a plurality of different colored colorants, the particle size of each colored colorant in the first colorant is from 100nm to 2000nm; when the second colorant includes a plurality of colorants of different colors, the particle size of the colorant of each color in the second colorant is 100nm to 2000nm. In the application, the coloring agent with the particle size of 100nm-2000nm is adopted, so that the coloring agent can be uniformly distributed in the ceramic substrate 10 in the process of preparing the shell 100 without agglomeration, the mechanical strength of the ceramic substrate 10 and the shell 100 is further ensured, and the uniformity and the fine sense of the color of the shell 100 can be improved. Further, the particle size of the first colorant is 500nm-1000nm, and the particle size of the second colorant is 500nm-1000nm; furthermore, the particle size of the first colorant is 600nm-900nm, and the particle size of the second colorant is 600nm-900nm, which is beneficial to enhancing the coloring effect and the uniformity of the appearance color of the shell 100.

In the present application, the transition zone 13 presents a transition from a first color to a second color along a first direction, it being understood that the transition zone 13 presents a transition from the second color to the first color along a direction opposite to the first direction, while the dimension of the transition zone 13 in the first direction is greater than 5mm. By providing the gradual change region 13, the ceramic substrate 10 has very gentle color transition and the sense of fineness is enhanced. Further, the size of the transition region 13 in the first direction is greater than 10mm. In the present application, the width of the transition region 13 is the minimum dimension of the transition region 13 in the first direction. In one embodiment, the width of the transition zone 13 is greater than 5mm; further, the width of the transition region 13 is greater than 10mm. In another embodiment, the width of the transition zone 13 is less than 20mm. By controlling the size of the transition region 13 in the first direction, the visual effect of the housing 100 is enriched, which is beneficial to the application of the housing in electronic products and improves the appearance selectivity of the products.

In the present application, the first color gradation to the second color gradation is presented in the first direction gradation region 13. In the present embodiment, the gradation region 13 includes a first colorant and a second colorant, and the mass content of the first colorant in the gradation region 13 gradually decreases in the first direction. That is, the mass content of the first colorant in the transition region 13 decreases in the first direction until the mass content of the first colorant is at a minimum, or even zero, at the interface between the second region 12 and the transition region 13. The content of the first colorant and the second colorant in the gradient area 13 is controlled, so that the color of the gradient area 13 presents a gradient effect. It will be appreciated that when the second region 12 does not contain the second colorant, the transition region 13 now does not contain the second colorant, but only the first colorant. In one embodiment, the mass content of the second colorant in the transition region 13 decreases gradually in a direction opposite to the first direction. That is, the mass content of the second colorant in the transition region 13 decreases in a direction opposite to the first direction until the mass content of the second colorant reaches a minimum, or even zero, at the interface between the first region 11 and the transition region 13. In another embodiment, the mass content of the second colorant in the transition region 13 gradually decreases and reaches zero in the direction opposite to the first direction, and then the mass content of the second colorant in the transition region 13 continues to remain zero in the direction opposite to the first direction. In the present embodiment, the mass content of the first colorant in the transition region 13 decreases linearly in the first direction. Thereby providing a more gradual transition in the color of the fade area 13. In another embodiment of the present application, the mass content of the second colorant in the transition region 13 decreases linearly in a direction opposite to the first direction. Thereby providing a more gradual transition in the color of the fade area 13.

In the present embodiment, the ceramic substrate 10 is a zirconia-based ceramic. That is, the material of the ceramic substrate 10 is mainly zirconia, and the zirconia-based ceramic has excellent toughness, strength and hardness, so that the mechanical properties and the resistance of the ceramic substrate 10 and the case 100 are improved, and the application thereof is facilitated. In an embodiment of the present application, the material of the ceramic substrate 10 includes zirconia, a stabilizer, a first colorant, and a second colorant. Specifically, the stabilizer may include, but is not limited to, at least one of yttrium oxide, hafnium oxide, lanthanum oxide, cerium oxide, scandium oxide, calcium oxide, magnesium oxide, ytterbium oxide, and tantalum oxide. In the present application, the addition of the stabilizer facilitates the formation of a stable and dense zirconia crystal phase in the finally obtained ceramic substrate 10, so as to improve the performance of the ceramic substrate 10. Optionally, the mass content of the stabilizer in the ceramic substrate 10 is 3% to 10%. Further, the mass content of the stabilizer in the ceramic substrate 10 is 4% to 6%. In one embodiment, the stabilizers in the ceramic substrate 10 are yttrium oxide and hafnium oxide. The yttrium oxide ensures that the ceramic substrate 10 has a high content of tetragonal phase, and enables the ceramic substrate 10 to have good stability, so as to prevent cracking of the ceramic substrate 10 during sintering and processing, and the hafnium oxide is a companion of zirconium oxide, and has similar physicochemical properties, so as to stabilize the ceramic substrate 10. In another embodiment, the tetragonal zirconia in the ceramic substrate 10 accounts for 70% or more of the mass of the zirconia. In another embodiment of the present application, the material of the ceramic substrate 10 further includes alumina, and the mass content of the alumina in the ceramic substrate 10 is less than 1%. Further, the mass content of alumina in the ceramic substrate 10 is less than 0.5%.

The bending strength refers to the ability of the ceramic substrate 10 to resist bending without breaking. The evaluation is generally carried out by a three-point bending resistance test or a four-point test method. In the application, the ceramic substrate 10 is subjected to three-point bending strength detection by using GB/T6569-2006 Fine ceramic bending strength test method. In the present embodiment, the ceramic substrate 10 has a flexural strength of more than 800MPa. Further, the bending strength of the ceramic substrate 10 is greater than 900MPa. The ceramic substrate 10 of the present application has excellent bending strength, and further, the bending strength of the case 100 is ensured, so that the ceramic substrate has a better application prospect.

The fracture toughness is a resistance value exhibited by the material when a crack or a crack-like defect occurs in the ceramic substrate 10, and the crack no longer rapidly fractures with an increase in load, that is, when a so-called unstable fracture occurs. Fracture toughness characterizes the ability of a material to prevent crack propagation, and is a quantitative indicator for measuring the toughness of the material. In the application, the fracture toughness of the ceramic substrate 10 is detected by three-point bending in GB/T23806-2009 unilateral pre-cracked beam (SEPB) method of the fine ceramic fracture toughness test method. In the present embodiment, the ceramic substrate 10 has a fracture toughness of more than 7MPa · m ^1/2 . Further, the ceramic substrate 10 has a fracture toughness of more than 7.5MPa · m ^1/2 . The ceramic substrate 10 of the present application has good fracture toughness and excellent brittle fracture resistance, and ensures that the housing 100 hasExcellent performance.

Hardness characterizes the ability of the ceramic substrate 10 to resist hard objects pressed into its surface. The standard format for the vickers hardness values is xHVy, with the value x before HV being the hardness value and the value y after HV being the test force. The ceramic substrate 10 was inspected by a vickers hardness tester. In the present embodiment, the vickers hardness of the ceramic substrate 10 is greater than 500hv0.1. Further, the vickers hardness of the ceramic substrate 10 is more than 600hv0.1. The ceramic substrate 10 has high hardness and good deformation resistance.

In the present embodiment, the surface roughness of the ceramic substrate 10 is less than 0.01 μm. By providing the ceramic substrate 10 with a small surface roughness, it is further advantageous to enhance the surface smoothness thereof. In the embodiment of the present application, the surface roughness of the case 100 is less than 0.01 μm, which is advantageous for its application in electronic devices.

In the present application, the porosity of the ceramic substrate 10 was measured by using GB/T25995-2010 "Fine ceramic Density and apparent porosity test method". In the present embodiment, the porosity of the ceramic substrate 10 is less than 1%. I.e. the density of the ceramic substrate 10 is more than 99%. The low porosity of the ceramic substrate 10 ensures the bonding strength inside the ceramic substrate 10, which is beneficial to improving the mechanical performance of the housing 100.

Referring to fig. 5, a flowchart of a method for manufacturing a housing according to an embodiment of the present disclosure is shown, where the method for manufacturing the housing 100 according to any of the embodiments includes:

operation 101: providing a first ceramic slurry and a second ceramic slurry, wherein the first ceramic slurry comprises first ceramic powder, the first ceramic powder comprises a first colorant, the second ceramic powder comprises a second colorant, the mass content of the first colorant in the first ceramic powder is 4-10%, the mass content of the second colorant in the second ceramic powder is 0-2%, and at least one of the first colorant and the second colorant is a non-spinel colorant.

Operation 102: and manufacturing the first ceramic slurry and the second ceramic slurry into a ceramic substrate green body, wherein the ceramic substrate green body comprises the first ceramic green body and the second ceramic green body which are spliced, the first ceramic green body is manufactured by the first ceramic slurry, the second ceramic green body is manufactured by the second ceramic slurry, and the first ceramic green body and the second ceramic green body have color difference.

Operation 103: and (4) removing the glue from the ceramic substrate green body, sintering to obtain the ceramic substrate, and preparing the shell.

In the present application, the ceramic substrate green body has a plurality of ceramic green bodies of different colors, and the adjacent first ceramic green body and the second ceramic green body can generate diffusion of the colorant in the ceramic green bodies during sintering, and generate color mixing near the splicing surface to form a color different from the first color and the second color. The content and the type of the colorant in the first area 11 and the second area 12 are controlled, so that the diffusion range of the first colorant and the second colorant is wider, and the gradual change area 13 is formed.

As can be appreciated, the ceramic substrate 10 includes a first region 11, a second region 12, and a graded region 13 located between the first region 11 and the second region 12; the first area 11 presents a first color, the second area 12 presents a second color, and the first area 11 and the second area 12 have a color difference; the direction from the first area 11 to the second area 12 is a first direction, a gradual change from the first color to the second color is presented along a gradual change area 13 in the first direction, and the size of the gradual change area 13 in the first direction is more than 5mm. Wherein the sintered first ceramic green body forms the first region 11 and a portion of the transition region 13 and the sintered second ceramic green body forms the second region 12 and a portion of the transition region 13. That is, the ceramic substrate 10 includes a first ceramic having a first region 11 and a second ceramic having a second region 12 disposed adjacent to each other, with a transition region 13 between the first region 11 and the second region 12, the transition region 13 being located in a portion of the first ceramic and a portion of the second ceramic. In the ceramic substrate 10 of the present application, there is no joint between the first region 11 and the transition region 13, there is no joint between the second region 12 and the transition region 13, and there is a joint in the transition region 13. That is, although the boundary line or the boundary surface of the first region 11 and the transition region 13 and the boundary line or the boundary surface of the second region 12 and the transition region 13 are provided on the finally formed housing 100, there is no splicing seam.

In operation 101, the size of the transition region 13 in the first direction is larger than 5mm by controlling the mass content of the first colorant in the first ceramic powder to be 4% -10% and the mass content of the second colorant in the second ceramic powder to be 0% -2%. When the first colorant content is too low or the second colorant content is too high, it cannot be guaranteed that the size of the transition region 13 in the first direction is greater than 5mm; when the content of the first colorant is too high, the mechanical property of the first ceramic green body is not facilitated, the selection of the sintering temperature can be influenced, and the shrinkage rates of the first ceramic green body and the second ceramic green body during sintering can not be ensured to be similar. Thus, the present application, by employing the first colorant and the second colorant in the above amounts, can both cause the shell 100 to present a transition zone 13 having a distinct color-mitigating transition, while at the same time ensuring the performance of the shell 100. In one embodiment, the first colorant is present in the first ceramic powder in an amount of 6% to 10% by mass, and the second colorant is present in the second ceramic powder in an amount of 0% to 1% by mass, so that the size of the transition region 13 in the first direction is greater than 10mm. In another embodiment, the size of the transition zone 13 in the first direction is less than or equal to 20mm. In the present application, the difference between the first colorant and the second colorant is greater than 2%. Further, the difference between the first colorant and the second colorant is greater than 4%, further improving the visual effect of the transition region 13. It can be understood that the first ceramic green body and the second ceramic green body which are prepared subsequently have color difference by controlling the content and the color of the first colorant and the second colorant.

In operation 101, at least one of the first colorant and the second colorant is a non-spinel colorant. The non-spinel colorant has good thermal diffusivity, and can diffuse rapidly during sintering, thereby forming a relatively wide gradient region 13 and enhancing the appearance of the housing 100. In one embodiment, when the second colorant is present in the second ceramic powder in an amount of 0% by mass, the first colorant is a non-spinel colorant, which is more advantageous for the creation of the wider-sized graded region 13. In another embodiment, both the first colorant and the second colorant are non-spinel colorants, which is more conducive to the creation of a wider size transition zone 13. In embodiments of the present application, the thermal diffusion of the first colorant and the second colorant is below the sintering temperature. In an embodiment, the atomic diffusion temperature of the first and second colorants is lower than the sintering temperature, such that a transition region 13 may occur during sintering.

In an embodiment of the present application, a first ceramic powder includes zirconia, a stabilizer, and a first colorant. In one embodiment, the first ceramic powder comprises 3-10% of stabilizer, 4-10% of first colorant and the balance of zirconia by mass percent. In one embodiment, the stabilizer can be, but is not limited to, yttrium oxide and hafnium oxide, wherein the first ceramic powder comprises 3% to 6% of yttrium oxide and 1% to 4% of hafnium oxide by mass percent. In the present application, the presence of the stabilizer has no effect on the size of the transition zone 13. In another embodiment of the present application, the first ceramic powder includes zirconia, a stabilizer, alumina, and a first colorant. In the present application, alumina is dispersed in the first ceramic powder and distributed in the first ceramic green body, which is dispersed around the zirconia grains and the colorant, and plays a pinning role in diffusion of the colorant during sintering, suppressing diffusion of the colorant, and further affecting generation of the wider gradient region 13. In one embodiment, the first ceramic powder comprises 3-10% of stabilizer, less than 1% of alumina, 4-10% of first colorant and the balance of zirconia by mass percent. In another embodiment, the first ceramic powder does not contain alumina, which facilitates the formation of the wider transition region 13. In a specific embodiment, the first ceramic powder comprises a first colorant, the mass content of the first colorant in the first ceramic powder is 4% -10%, the first colorant is a non-spinel colorant, the mass content of the second colorant in the second ceramic powder is 0%, and neither the first ceramic powder nor the second ceramic powder contains alumina. Thereby, a transition area 13 with a gentle color transition is produced, the dimension of the transition area 13 in the first direction being larger than 8mm.

In an embodiment of the present application, the first ceramic slurry includes a first ceramic powder and a first organic auxiliary. The first ceramic powder can be uniformly dispersed in the first organic auxiliary agent, thereby forming a first ceramic slurry. In one embodiment, the mass ratio of the first organic auxiliary agent to the first ceramic powder is (0.01-0.2): 1. further, the mass ratio of the first organic auxiliary agent to the first ceramic powder is (0.05-0.18): 1. and in the subsequent glue discharging and sintering processes, the first organic auxiliary agent is completely discharged through decomposition or volatilization. In one embodiment, the first organic adjuvant comprises a binder. Specifically, the binder may include, but is not limited to, at least one of polymethyl methacrylate, polyvinyl butyral, polyethylene, and polyethylene glycol. Through setting up the binder for each component in the first ceramic powder can the homodisperse in first organic auxiliary agent, and through the binder effect, strengthen the intensity of first ceramic unburned bricks between each component. In another embodiment, the first organic auxiliary agent may include, but is not limited to, at least one of a binder, an organic solvent, a plasticizer, a dispersant, a defoaming agent, and a lubricant. Specifically, the organic solvent may include, but is not limited to, at least one of absolute ethyl alcohol, toluene, and ethylene glycol, the plasticizer may include, but is not limited to, at least one of dimethyl dibutyl phthalate, dioctyl phthalate, and butyl benzyl phthalate, the dispersant may be, but is not limited to, triethanolamine, the antifoaming agent may be, but is not limited to, dimethyl siloxane, and the lubricant may be, but is not limited to, at least one of stearic acid and paraffin wax. In the present application, when the first organic auxiliary contains a plurality of components, the ratio of each component may be selected according to the requirements of the subsequent preparation process, and the types of the components in the first organic auxiliary may be added according to the requirements.

In an embodiment of the present application, the second ceramic powder includes zirconia, a stabilizer, and a second colorant. In one embodiment, the second ceramic powder comprises 3-10% of stabilizer, 0-2% of second colorant and the balance of zirconia by mass percent. In a specific embodiment, the stabilizer can be, but is not limited to, yttrium oxide and hafnium oxide, and the second ceramic powder contains 3% to 6% of yttrium oxide and 1% to 4% of hafnium oxide by mass percent. In another embodiment of the present application, the second ceramic powder includes zirconia, a stabilizer, alumina, and a second colorant. In the present application, the alumina is dispersed in the second ceramic powder and distributed in the second ceramic green compact, which is dispersed around the zirconia grains and the colorant, and plays a pinning role in diffusion of the colorant during sintering, suppressing diffusion of the colorant, and further affecting generation of the wider gradient region 13. In one embodiment, the second ceramic powder comprises 3-10% of stabilizer, less than 1% of alumina, 0-2% of second colorant and the balance of zirconia by mass percent. In another embodiment, the second ceramic powder does not contain alumina, which facilitates the formation of the wider transition region 13.

In an embodiment of the present application, the second ceramic slurry includes a second ceramic powder and a second organic assistant. The second ceramic powder can be uniformly dispersed in the second organic auxiliary agent, thereby forming a second ceramic slurry. In one embodiment, the mass ratio of the second organic auxiliary to the second ceramic powder is (0.01-0.2): 1. further, the mass ratio of the second organic auxiliary agent to the second ceramic powder is (0.05-0.18): 1. and in the subsequent glue discharging and sintering processes, the second organic auxiliary agent is completely discharged through decomposition or volatilization. In one embodiment, the second organic adjuvant comprises a binder. Through setting up the binder for each component in the second ceramic powder can the homodisperse in the organic auxiliary agent of second, and through the binder effect, strengthen the intensity of second ceramic green compact between each component. In another embodiment, the second organic auxiliary agent may include, but is not limited to, at least one of a binder, an organic solvent, a plasticizer, a dispersant, a defoamer, and a lubricant. In the application, the selection of each component in the second organic assistant may refer to the selection of each component in the first organic solvent, and the components and the proportions of each component of the first organic assistant and the second organic assistant may be the same or different, and are not limited; when the second organic auxiliary agent contains a plurality of components, the proportion of each component can be selected according to the requirements of the subsequent preparation process, and the types of the components in the second organic auxiliary agent can be added according to the requirements.

In operation 102, the first ceramic slurry and the second ceramic slurry are formed into a ceramic substrate green body, including: and preparing the first ceramic slurry and the second ceramic slurry into a ceramic substrate green body by adopting at least one of dry pressing, tape casting and injection molding. In the present application, the first ceramic green body exhibits a first color and the second ceramic green body exhibits a second color.

In one embodiment of the present application, the first ceramic slurry and the second ceramic slurry are formed into a green ceramic substrate by dry press molding. In an embodiment, before the dry-pressing, the method further includes spray-drying the first ceramic slurry and the second ceramic slurry to obtain a first ceramic powder and a second ceramic powder, respectively. Specifically, the particle size of the first ceramic powder and the second ceramic powder may be, but is not limited to, 50 μm to 100 μm, which is beneficial to the tight bonding inside the ceramic substrate green body during the dry pressing process. In another embodiment, the first ceramic powder is made into a first ceramic green body and the second ceramic powder is made into a second ceramic green body by pre-pressing; and after the first ceramic green body and the second ceramic green body are spliced, pressing the first ceramic green body and the second ceramic green body into a molded ceramic substrate green body. Specifically, the pre-pressing can be, but is not limited to, processing for 10s-150s under 5MPa-20MPa, and the pressing can be, but is not limited to, processing for 5s-150s under 50MPa-200MPa, so that a ceramic substrate green body with high strength is prepared, and the improvement of the mechanical properties of the ceramic substrate 10 and the shell 100 is facilitated.

In another embodiment of the present application, the first ceramic slurry and the second ceramic slurry are formed into a green ceramic substrate by tape casting. In an embodiment, before the casting, the first ceramic slurry and the second ceramic slurry are subjected to ball milling, which is more beneficial for the subsequent casting process. In another embodiment, the viscosity of the first ceramic slurry and the second ceramic slurry is less than 2200cps. Further, the first ceramic slurry and the second ceramic slurry have a viscosity of 500cps to 2000cps. Thus, casting can be performed better, and the size of the formed ceramic green body can be controlled better. Specifically, the tape casting can be, but not limited to, at a tape casting speed of 0.4m/min to 1m/min and a tape casting drying zone temperature of 70 ℃ to 100 ℃ to obtain a first ceramic body and/or a second ceramic body with a thickness of 0.5mm to 1.2 mm.

In another embodiment of the present application, the first ceramic slurry and the second ceramic slurry are formed into a green ceramic substrate by injection molding. In an embodiment, before injection molding, ball milling is further performed on the first ceramic slurry and the second ceramic slurry, which is more beneficial for injection molding. In another embodiment, the first ceramic slurry and the second ceramic slurry are injected into an injection molding machine to injection mold a green ceramic substrate. Specifically, the injection temperature can be but not limited to 150-200 ℃, and the injection pressure can be but not limited to 70-100 MPa, so that the ceramic substrate green body is favorably formed.

In an embodiment of the present application, the difference in density between the first and second green ceramic bodies is less than 0.08g/cm ³ . Thereby ensuring that the shrinkage rates of the first ceramic green body and the second ceramic green body are not greatly different in the subsequent sintering process, and ensuring the production yield of the ceramic substrate 10 and the shell 100.

In this application, first ceramic unburned bricks and second ceramic unburned bricks can be controlled the concatenation, can also splice from top to bottom, and can also one set up around another, and specific position relation can be selected according to actual need. Meanwhile, the left-right splicing and the up-down splicing are relative position relationships of the first ceramic green body and the second ceramic green body in practical use, and are only used for describing an exemplary arrangement mode of the first ceramic green body and the second ceramic green body. In the present application, by the above-mentioned forming method, ceramic substrate green sheets of different shapes, for example, but not limited to, planar, three-dimensional, curved, and unequal thickness ceramic substrate green sheets, or ceramic substrate green sheets of circular, semicircular, elliptical, triangular, square, rectangular, and irregular polygonal shapes, can be manufactured, so as to improve the variety of the appearance of the case 100.

Fig. 6 is a schematic structural diagram of a ceramic substrate green body according to an embodiment of the present disclosure, where (a) - (i) in fig. 6 are schematic structural diagrams of ceramic substrate green bodies with different splicing manners, where a is a ceramic green body exhibiting a color a, B is a ceramic green body exhibiting a color B, and C is a ceramic green body exhibiting a color C. It is understood that the green ceramic substrate may be composed of, but not limited to, two, three, or more than three green ceramic bodies. Through splicing a plurality of ceramic greenwares, and adjacent ceramic greenwares colour is different, forms ceramic substrate greenwares, and then improves casing 100's product diversity. It is understood that fig. 6 is a schematic diagram illustrating an exemplary splicing manner, in actual manufacturing, the ceramic green bodies may be, but are not limited to, square, rectangular, circular, oval, semicircular, irregular, etc., and two, three, or more than three ceramic green bodies may be spliced together, and the specific splicing manner may be selected according to actual needs.

In operation 103, the discharging comprises processing at 300 ℃ -500 ℃ for 12h-24h; the sintering comprises processing at 1300-1500 ℃ for 2-4 h. Specifically, the glue discharging temperature can be but is not limited to 300 ℃, 320 ℃, 350 ℃, 370 ℃, 410 ℃, 450 ℃, 480 ℃ or 500 ℃, and the glue discharging time can be but is not limited to 12 hours, 14 hours, 15 hours, 17 hours, 19 hours, 20 hours, 22 hours or 24 hours, so that the ceramic substrate green body is ensured not to crack in the glue discharging process; the sintering temperature can be but is not limited to 1300 ℃, 1350 ℃, 1370 ℃, 1400 ℃, 1450 ℃, 1460 ℃ or 1500 ℃, and the sintering time can be but is not limited to 2 hours, 2.5 hours, 3 hours, 3.5 hours or 4 hours, so that the internal bonding strength and the compactness of the ceramic substrate green body are improved. Through binder removal and sintering, organic components in the ceramic substrate green body, such as a first organic auxiliary agent, a second organic auxiliary agent and the like, are discharged, meanwhile, the compactness and the bonding strength inside the ceramic substrate green body are enhanced, in the process, the first coloring agent and the second coloring agent are diffused to form a gradual change area 13, and the shell 100 with rich appearance effect is obtained. In one embodiment, the thermal diffusion temperature of the first colorant and the second colorant is less than the sintering temperature. Optionally, the thermal diffusion temperature of the first colorant and the second colorant is less than 1300 ℃; further, the first colorant and the second colorant have a thermal diffusion temperature of less than 1200 ℃. Thus, the generation of the wider size transition region 13 is ensured. In another embodiment, the porosity of the ceramic substrate 10 is less than 1%, enhancing the overall mechanical properties. In yet another embodiment, the first and second green ceramic bodies have a bond strength greater than 800MPa after sintering. Further, the first ceramic green body and the second ceramic green body have a bond strength greater than 900MPa. Thus, the internal bonding strength of the ceramic substrate 10 is improved, so that it is not easily cracked. In the present application, the bonding strength of the first ceramic green sheet and the second ceramic green sheet in the ceramic substrate 10 is measured by using GB/T6569-2006 Fine ceramic flexural Strength test method.

In one embodiment of the present application, the surface of the ceramic substrate 10 after sintering is polished. In one embodiment, the sanding depth is greater than 0.05mm. Thus, the ceramic surface is guaranteed to be consistent with the internal color. Further, the surface of the ceramic substrate 10 is roughly and finely processed to reduce the surface roughness, which is more advantageous for its application. In a specific embodiment, the surface roughness of the ceramic substrate 10 after sintering is less than 10.0 μm after sintering, the surface roughness of the ceramic substrate 10 after polishing is less than 1.0 μm after sintering, the surface roughness of the ceramic substrate 10 after rough machining is less than 0.1 μm after sintering, and the surface roughness of the ceramic substrate 10 after finish machining is less than 0.01 μm after sintering, so that the shell 100 with excellent smoothness is obtained, and can be used for rear covers, frames, keys, decorative parts and the like, and the appearance effect of products is improved.

The preparation method of the shell 100 provided by the application is simple to operate, is easy for large-scale production, can prepare the shell 100 with rich appearance effect, and is beneficial to application of the shell 100.

The present application also provides an electronic device including the housing 100 of any of the above embodiments. It is understood that the electronic device may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a watch, an MP3, an MP4, a GPS navigator, a digital camera, etc. In an embodiment of the present application, an electronic device includes a housing and a main board, and the housing includes the housing 100 of any of the embodiments described above. The shell 100 can give the electronic device a multi-color appearance, and meanwhile, the transition gradual change area 13 is also provided, so that the sense of delicateness of the appearance effect is increased, and the expressive force of the electronic device is improved.

Examples

Weighing 2% of hafnium oxide, 5% of yttrium oxide and 93% of zirconium oxide according to the mass percentage, mixing the hafnium oxide, the 5% of yttrium oxide and the 93% of zirconium oxide with a binder, and performing dry pressing to obtain a ceramic green body A-1.

Weighing 0.5% Er by mass ₂ O ₃ Colorant, 0.3% aluminum oxide, 2% hafnium oxide, 5% yttrium oxide, and balance oxygenAnd (3) zirconium is melted, and the zirconium is mixed with a binder, a dispersant and a lubricant, and then the mixture is subjected to dry pressing forming to obtain a ceramic green body A-2.

Weighing Er 1.5% by weight ₂ O ₃ The ceramic green body A-3 is prepared by mixing a colorant, 0.6% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with a binder, a dispersant and a lubricant, and performing dry pressing.

Weighing 3% Er according to the mass percentage ₂ O ₃ The ceramic green body A-4 is prepared by mixing a colorant, 0.6% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with an organic auxiliary agent and carrying out dry pressing forming.

Weighing 1.5% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide according to the mass percentage, mixing the materials with an organic auxiliary agent, and carrying out dry pressing to obtain a ceramic green body A-5.

Wherein Er is as defined above ₂ O ₃ The colorant has a non-spinel structure and a particle size of 900nm.

Weighing 7% of Cr according to mass percentage ₂ O ₃ The ceramic green body B-1 is prepared by mixing a colorant, 0.5% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with a binder and performing dry pressing.

Weighing 5% by mass of Cr ₂ O ₃ The ceramic green body B-2 is prepared by mixing a colorant, 0.2% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with a binder, a defoaming agent and a dispersing agent, and performing dry pressing and forming.

Weighing 3% of Cr by mass ₂ O ₃ The ceramic green body B-3 is prepared by mixing a colorant, 0.6% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with an organic auxiliary agent and carrying out dry pressing forming.

Wherein the above Cr is ₂ O ₃ The colorant has a non-spinel structure and a particle size of 600nm.

Weighing 7% of Cr according to mass percentage ₂ O ₃ Colorant (non-spinel structure, particle size 80 nm), 0.5% aluminum oxide, 2% hafnium oxide, 5%Yttrium oxide and the balance of zirconium oxide, and mixing the yttrium oxide and the balance of zirconium oxide with an organic auxiliary agent, and performing dry pressing and forming to obtain a ceramic green body B-4.

Weighing 7% of Cr according to mass percentage ₂ O ₃ The ceramic green body B-5 is prepared by mixing a colorant (with a non-spinel structure and a particle size of 2500 nm), 0.5% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with an organic auxiliary agent, and performing dry pressing forming on the mixture.

Weighing 7 percent of CoAl according to mass percentage ₂ O ₄ A colorant (spinel structure, particle size of 1200 nm), 0.5% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide, and the colorant, the binder, the defoaming agent and the dispersant are mixed, and the mixture is subjected to dry pressing and forming to obtain a ceramic green body C-1.

Weighing 1.5 percent (Co) according to the mass percentage _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ A colorant (spinel structure, particle size of 1200 nm), 0.6% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide, and the colorant, the binder, the defoaming agent and the dispersant are mixed, and the mixture is subjected to dry pressing and forming to obtain a ceramic green body D-1.

Weighing 0.5% of Cr ₂ O ₃ Coloring agent (non-spinel structure, particle diameter of 600 nm), 0.5% of CoAl ₂ O ₄ The ceramic green body E-1 is prepared by mixing a colorant (with a spinel structure and a particle size of 1200 nm), 0.6% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with an organic auxiliary agent, and performing dry pressing and forming.

The ceramic green compacts obtained above were spliced together in the combination manner shown in table 1 to form ceramic substrate green compacts. And (3) treating the shell green body at 400 ℃ for 15h, and then at 1400 ℃ for 4h to obtain a ceramic substrate, thus obtaining the shell. The width of the transition region was measured for the obtained case, and the results are shown in table 1. Wherein, the measuring mode of the width of the gradual change area is as follows: and determining boundary lines of the gradual change region, the first region and the second region, measuring the distance between the two boundary lines by using a vernier caliper, measuring three different positions on each boundary line, and calculating an average value.

TABLE 1 transition zone Width

The results of the examples of the application show that the content of the colorant in the ceramic green body A-4 exceeds 2%, and the content of the colorant in the ceramic green body B-3 is less than 4%, so that the width of the transition region of A-4/B-1, A-1/B-3 and A-3/B-3 is less than 5mm, and a wider transition region range cannot be reached. Both the ceramic green body C-1 and the ceramic green body D-1 are spinel colorants, and therefore, the width of the transition region of C-1/D-1 is much less than 5mm. The alumina content in the ceramic green body A-5 is too high, which in turn makes the width of the transition region in A-5/B-1 narrower compared to the width of the transition region in A-1/B-1. Compared with B-2 and B-3, the ceramic green body B-1 has higher content of colorant, so that the range of the gradual change region obtained by the shell formed by the ceramic green body B-1 is wider. Because of the smaller colorant particle size used in the ceramic green body B-4, the mechanical properties of A-1/B-1 are superior to those of A-1/B-4. As the ceramic green body B-5 adopts larger colorant particle size, the color uniformity of A-1/B-1 is better than that of A-1/B-5. Since the ceramic green body B-1 is a non-spinel structure coloring agent and the ceramic green body C-1 is a spinel structure coloring agent, the width of the transition region A-1/B-1 is significantly larger than that of the transition region A-1/C-1.

The foregoing detailed description has provided for the embodiments of the present application, and the principles and embodiments of the present application have been presented herein for purposes of illustration and description only and to facilitate understanding of the methods and their core concepts; meanwhile, for a person skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A housing comprising a ceramic substrate comprising a first region, a second region, and a transition region between the first region and the second region;

the first region presents a first color, the second region presents a second color, the first region and the second region have color difference, the first region comprises a first colorant, the second region comprises a second colorant, the first colorant and the second colorant are non-spinel colorants, the mass content of the first colorant in the first region is 4% -10%, and the mass content of the second colorant in the second region is 0% -2%; the ceramic substrate is made of aluminum oxide, and the mass content of the aluminum oxide in the ceramic substrate is less than 1%;

the direction from the first area to the second area is a first direction, the gradual change area presents gradual change from a first color to a second color along the first direction, and the size of the gradual change area in the first direction is larger than 5mm.

2. The housing of claim 1, wherein the first region and the second region have a color difference value greater than 2.

3. The housing of claim 1, wherein the fade area comprises the first colorant and the second colorant, and wherein the mass content of the first colorant in the fade area decreases linearly along the first direction.

4. The housing of claim 1, wherein the first region and the transition region are disposed contiguously and the second region and the transition region are disposed contiguously.

5. The housing of claim 1, wherein the ceramic substrate is a zirconia-based ceramic.

6. The housing of claim 1Characterized in that the bending strength of the ceramic substrate is more than 800MPa, and the fracture toughness is more than 7MPa ^1/2 The Vickers hardness is more than 500Hv0.1, and the surface roughness is less than 0.01 μm.

7. A method of making a housing, comprising:

providing a first ceramic slurry and a second ceramic slurry, wherein the first ceramic slurry comprises a first ceramic powder, the first ceramic powder comprises a first coloring agent, the second ceramic slurry comprises a second ceramic powder, the second ceramic powder comprises a second coloring agent, the first coloring agent accounts for 4-10% of the first ceramic powder by mass, the second coloring agent accounts for 0-2% of the second ceramic powder by mass, and the first coloring agent and the second coloring agent are non-spinel coloring agents;

the shell is prepared by removing glue from the ceramic substrate green body and sintering the ceramic substrate green body, and then the ceramic substrate is obtained, wherein the shell comprises a ceramic substrate, the ceramic substrate is made of alumina, the mass content of the alumina in the ceramic substrate is less than 1%, and the ceramic substrate comprises a first area, a second area and a gradual change area between the first area and the second area; the first region exhibits a first color, the second region exhibits a second color, and the first region and the second region have a color difference; the direction from the first area to the second area is a first direction, the gradual change area presents gradual change from a first color to a second color along the first direction, and the size of the gradual change area in the first direction is larger than 5mm.

8. The method of making according to claim 7, wherein forming the first ceramic slurry and the second ceramic slurry into a green ceramic substrate comprises:

and preparing the first ceramic slurry and the second ceramic slurry into ceramic substrate green bodies by adopting at least one of dry pressing, tape casting and injection molding.

9. The production method according to claim 7, wherein the first ceramic slurry further comprises a first organic auxiliary agent, and the mass ratio of the first organic auxiliary agent to the first ceramic powder is (0.01-0.2): 1; the second ceramic slurry also comprises a second organic auxiliary agent, and the mass ratio of the second organic auxiliary agent to the second ceramic powder is (0.01-0.2): 1.

10. the method of claim 7, wherein the first ceramic powder further comprises alumina, and wherein the first ceramic powder has an alumina content of less than 1% by mass; the second ceramic powder also comprises alumina, and the mass content of the alumina in the second ceramic powder is less than 1%.

11. The method of claim 7, wherein the discharging comprises treating at 300 ℃ to 500 ℃ for 12h to 24h; the sintering comprises processing for 2-4 h at 1300-1500 ℃.

12. The method of claim 7, wherein the bond strength of the first and second green ceramic bodies after sintering is greater than 800MPa.

13. An electronic device, comprising a housing and a motherboard, wherein the housing comprises a ceramic substrate, the ceramic substrate comprises a first region, a second region and a transition region between the first region and the second region; the first region presents a first color, the second region presents a second color, the first region and the second region have a color difference, the first region comprises a first colorant, the second region comprises a second colorant, the first colorant and the second colorant are non-spinel colorants, the mass content of the first colorant in the first region is 4% -10%, and the mass content of the second colorant in the second region is 0% -2%; the ceramic substrate is made of aluminum oxide, and the mass content of the aluminum oxide in the ceramic substrate is less than 1%; the direction from the first area to the second area is a first direction, the gradual change area presents gradual change from a first color to a second color along the first direction, and the size of the gradual change area in the first direction is larger than 5mm.