CN114180959B

CN114180959B - Shell, preparation method thereof and electronic equipment

Info

Publication number: CN114180959B
Application number: CN202010971081.5A
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: 2023-01-31
Anticipated expiration: 2040-09-15
Also published as: CN114180959A

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 a first direction, the gradual change area presents gradual change from the first color to the second color along the first direction, and the size of the gradual change area in the first direction is less than 200 mu m. By arranging the areas with various colors and arranging the narrow gradual change area between the single color areas, the ceramic assembly has strong color clash effect, 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 application provides a shell, a preparation method thereof, the shell and an electronic device, wherein the shell presents multiple colors, a narrow color gradient region exists between the two colors, a strong visual effect of color collision is realized, and the appearance of the shell is greatly enriched; when the shell is applied to electronic equipment, the appearance effect and the product 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 less than 200 μm.

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

providing a first ceramic slurry, wherein the first ceramic slurry comprises first ceramic powder, the first ceramic powder comprises a first colorant, the first colorant is a spinel colorant, and the first colorant in the first ceramic powder accounts for 0.1-10% of the mass of the first colorant;

providing a second ceramic slurry, wherein the second ceramic slurry comprises second ceramic powder, the second ceramic powder comprises alumina, and the mass content of the alumina in the second ceramic powder is greater than or equal to 3%;

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 glue 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 less than 200 μm.

The application provides a shell and a preparation method of the shell, and the shell is characterized in that areas with various colors are arranged, and a narrow gradual change area is arranged between single color areas, so that the ceramic assembly presents a strong color clash effect, 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 explain the technical solution 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 an enlarged schematic view of the region a in fig. 1.

Fig. 3 is a top view of a housing according to an embodiment of the present application.

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

Fig. 5 is an enlarged schematic view of the region B in fig. 4.

Fig. 6 is an external view of a ceramic substrate according to another embodiment of the present disclosure.

Fig. 7 is an enlarged schematic view of region C in fig. 6.

Fig. 8 is an enlarged schematic view of region D in fig. 6.

Fig. 9 is a flowchart of a method for manufacturing a housing according to an embodiment of the present disclosure.

Fig. 10 is a schematic structural diagram of a green ceramic substrate provided in an embodiment of the present invention, where (a) in fig. 10 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.

Fig. 11 is an electron microscope image of a housing fabricated in accordance with an embodiment of the present application.

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. 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. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations 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, and fig. 2 is an enlarged schematic diagram of a region a in fig. 1, in which a housing 100 includes a ceramic substrate 10, the ceramic substrate 10 includes a first region 11, a second region 12, and a transition 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 first direction gradual change area 13, and the size of the gradual change area 13 in the first direction is less than 200 μm. In the application, the two colors generate obvious color collision effect by arranging the areas with multiple colors and enabling the size of a color transition area between the single color areas to be smaller than 200 mu m; meanwhile, the size of the gradual change region 13 in the first direction is narrow, and the gradual change region is not easy to be identified by naked eyes, so that a clear boundary line is formed between two colors, the appearance of the shell 100 is greatly improved, the visual effect of the shell 100 is enriched, and the application of the shell is facilitated.

Referring to fig. 3, a top view of the housing according to an embodiment of the present disclosure is shown, wherein the housing 100 has a first area 11 of a first color and a second area 12 of a second color, a size of a transition area 13 between the first area 11 and the second area 12 in a first direction is narrower, and the transition area 13 is not shown in fig. 3, such that a clear boundary is present between the first area 11 and the second area 12, and an appearance effect of the housing 100 is improved.

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 implicit to any number of technical features indicated. The application can have the region of two single colours, also can have the region of two above single colours, forms more colorful outward appearance effect. Fig. 4 is a schematic view of an appearance of a ceramic substrate according to an embodiment of the present disclosure, in which the ceramic substrate 10 includes a region I with a color a and a region II with a color B; please refer to fig. 5, which is an enlarged schematic view of the area B in fig. 4, wherein a transition area III is provided between the area I and the area II, and the dashed lines in fig. 5 are the boundary lines of the area I of the color a, the area II of the color B and the transition area III, respectively. Referring to fig. 6, an appearance of a ceramic substrate according to another embodiment of the present disclosure is schematically shown, in which the ceramic substrate 10 includes a region I with a color a, a region II with a color B, and a region IV with a color C; please refer to fig. 7, which is an enlarged schematic view of the region C in fig. 6, wherein a transition region III is formed between the region I and the region II; fig. 8 is an enlarged schematic view of a region D in fig. 6, wherein a transition region V is formed between the regions II and IV, and the dashed lines in fig. 7 and 8 are the 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 transition region 13 disposed around the first region 11, and a second region 12 disposed around the transition 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 region 11 or the second region 12 may not be added with a colorant, and the ceramic material is controlled to be colorless and transparent, so that the housing 100 has a partial color change and a partial transparent appearance, and the visual effect is more abundant.

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, if 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, and b value of b2, the lightness difference Δ L = | L1-L2 |, red, between the two colorsA/green difference Δ a = | -a 1-a2 |, a yellow/blue difference Δ b = | -b 1-b2 |, and a color difference value Δ E = (Δ L) between two colors ² +Δa ² +Δb ² ) ^1/2 . In this application, through controlling the chromatic aberration value of first region 11 and second region 12 to be greater than 2 to make the colour of first region 11 and second region 12 can be distinguished by people's eye, realize the outward appearance effect of multiple colour, further be favorable to the promotion of the effect of colliding with the look. 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 strong color contrast effect is formed.

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 11, a second region 12, and a transition region 13. 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 at 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 0.1% to 10% by mass. In the application, the mass content of the first colorant in the first region 11 is controlled to be 0.1-10%, so that the problems that the mechanical strength of the ceramic substrate 10 is influenced by too high content of the colorant and dyeing is not obvious due to too low content of the colorant are avoided. Further, the mass content of the first colorant in the first region 11 is 0.5% -5%. Furthermore, the first colorant is present in the first region 11 in an amount of 1% to 5% by mass, which darkens the first region 11 without increasing the size of the transition region 13 in the first direction too much.

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. In one embodiment, the second colorant is present in the second region 12 in an amount less than or equal to 10% by mass. Thereby achieving the coloration of the second region 12 while ensuring the mechanical properties of the second region 12. Further, the mass content of the second colorant in the second region 12 is 0.1% -5%. Thus, the size of the transition region 13 in the first direction is less than 200 μm. In another embodiment, the second colorant is present in the second region 12 at 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. Thus, the size of the gradation region 13 in the first direction is less than 200 μm.

In an embodiment of the present application, the first colorant is a 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, which may be, but is 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. In the present application, the use of spinel colorants facilitates the creation of a narrower transition region 13. In the embodiment of the present application, the second colorant may be a spinel colorant, may be a non-spinel colorant, and may be a mixture of a spinel colorant and a non-spinel colorant. 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, and the like. It will be appreciated that the first colorant and the second colorant 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 putty feeling is strong, the visual effect is good, the mutual agglomeration of the coloring agents is avoided, and the mechanical property 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 colorants of different colors, the particle size of the colorant of each color 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 and does not agglomerate in the process of preparing the shell 100, the mechanical strength of the ceramic substrate 10 and the shell 100 is further ensured, and the uniformity and the fineness 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 region 13 presents a transition from the first color to the second color along a first direction, it being understood that the transition region 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 region 13 in the first direction is less than 200 μm. It is understood that when the size of the gradient area 13 in the first direction is small, the color change cannot be observed with the naked eye, and the color change may be observed with a magnifying glass or a microscope, but not limited thereto. By arranging the gradual change region 13, the ceramic substrate 10 has a very obvious color impact effect, and the appearance expressive force is improved. Further, the size of the gradation region 13 in the first direction is smaller than 150 μm. 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 region 13 is less than 200 μm; further, the width of the transition region 13 is less than 150 μm. In another embodiment, the width of the transition region 13 is greater than or equal to 50 μm. 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 to second color gradation is presented along 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 along the first direction until the mass content of the first colorant reaches a minimum, even zero, at the boundary between the second region 12 and the transition region 13. 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, value 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 along the first direction. Thereby causing the content of the first colorant in the transition zone 13 to change rapidly and achieve a striking effect. 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 causing the content of the second colorant in the transition region 13 to change rapidly, achieving a color impact effect.

In the present embodiment, the second region 12 includes alumina, and the mass content of alumina in the second region 12 is greater than or equal to 3%. The alumina can stabilize the colorant and also inhibit the diffusion of the colorant, which is beneficial for reducing the size of the transition region 13 in the first direction, thereby obtaining a narrower transition region 13. Too low a mass content of alumina in the second region 12 is detrimental to obtaining a narrower transition region 13. Further, the mass content of alumina in the second region 12 is 3% -20%. Thus, the presence of alumina not only ensures the generation of the narrower transition region 13, but also does not affect the performance of the ceramic substrate 10. Furthermore, the mass content of the alumina in the second area 12 is 5-15%. In another embodiment of the present application, the first region 11 comprises alumina, and the mass content of alumina in the first region 11 is less than or equal to 20%. Further, the mass content of alumina in the first region 11 is 5% -15%. Furthermore, the mass content of alumina in the first region 11 is 6% -10%. Thereby facilitating a reduction in the size of the transition region 13 in the first direction, resulting in a transition region 13 having a narrower width.

In the present embodiment, the alumina has a particle size of 100nm to 2000nm. By adopting the alumina with the particle size of 100nm-2000nm, the uniform distribution of the alumina in the ceramic substrate 10 can be ensured, so that the ceramic substrate 10 and the shell 100 have excellent mechanical properties, are not easy to agglomerate, can be better distributed around the colorant, can fully block the diffusion of the colorant, and is more favorable for the generation of the narrower gradual change region 13. Furthermore, the grain diameter of the alumina is 500nm-1600nm. Further, the particle size of the alumina is 600nm to 1000nm. Specifically, the particle size of the alumina may be, but is not limited to, 100nm, 300nm, 500nm, 800nm, 1200nm, 1500nm, or 1700nm.

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, and improves the mechanical properties and the resistance of the ceramic substrate 10 and the case 100, thereby facilitating the application thereof. 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, by adding the stabilizer, a stable and dense zirconia crystal phase is advantageously formed in the finally obtained ceramic substrate 10, so as to improve the performance of the housing 100. 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.

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 housing 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. The fracture toughness characterizes the capability of the material for preventing crack propagation, and is a quantitative index for measuring the toughness of the material. In the application, three-point bending pairs in GB/T23806-2009 unilateral pre-crack Beam (SEPB) method of Fine ceramic fracture toughness test method are adoptedThe fracture toughness of the ceramic substrate 10 was examined. 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 has good fracture toughness and excellent brittle fracture resistance, and ensures that the shell 100 has excellent 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 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. 9, 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, wherein the first ceramic slurry comprises first ceramic powder, the first ceramic powder comprises a first coloring agent, the first coloring agent is a spinel coloring agent, and the mass content of the first coloring agent in the first ceramic powder is 0.1-10%.

Operation 102: and providing a second ceramic slurry, wherein the second ceramic slurry comprises second ceramic powder, the second ceramic powder comprises alumina, and the mass content of the alumina in the second ceramic powder is greater than or equal to 3%.

Operation 103: 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 104: 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 second ceramic green body undergo diffusion of a colorant in the ceramic green bodies during sintering, and a color mixture occurs near a joint surface to form a color different from the first color and the second color. The content and the type of the first colorant and the composition of the second ceramic powder are controlled, so that the diffusion distance of the colorant in the ceramic green body component is small in the sintering process, and a narrow and clear approximately linear gradual change region 13 can be 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 less than 200 μm. 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 gradation region 13 and the boundary line or the boundary surface of the second region 12 and the gradation region 13 are provided on the finally formed ceramic substrate 10, there is no splice seam.

In operation 101, the mass content of the first colorant in the first ceramic powder is controlled to be 0.1% to 10%, and the first colorant is a spinel colorant. When the content of the first colorant is too high, the mechanical property of the first ceramic green body is not facilitated, and the selection of the sintering temperature is influenced, so that the shrinkage rates of the ceramic green bodies during sintering cannot be ensured to be similar, and the diffusion range of the first colorant is wider, so that the narrow gradual change region 13 is not facilitated to be generated; if the content of the first coloring agent is too low, the first ceramic green compact cannot exhibit a distinct color, and the striking effect is not exhibited. Therefore, the present application can make the shell 100 exhibit the narrow and distinct line transition region 13 by using the first colorant in the above-mentioned amount, and simultaneously ensure the performance of the shell 100. The spinel colorant has excellent structural stability and high-temperature stability, and the spinel colorant is slowly thermally diffused during sintering, which is advantageous in that the size of the transition region 13 in the first direction is less than 200 μm. Further, the mass content of the first colorant in the first ceramic powder is 0.5% -8%. Furthermore, the mass content of the first colorant in the first ceramic powder is 1-5%. Specifically, the mass content of the first colorant in the first ceramic powder may be, but is not limited to, 0.1%, 0.5%, 1%, 3%, 5%, 7%, or 9%. Thereby, the size of the gradation region 13 in the first direction can be further reduced so that the gradation region 13 is formed on the final casing 100 approximately as a boundary line so that the appearance thereof exhibits a conspicuous color impact effect.

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, 0.1-10% of first 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, 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 application, the alumina can play a role in hindering the diffusion of the colorant, and part of the alumina can enter a spinel structure under a high-temperature condition, so that the stability of the spinel colorant is further improved, and the diffusion speed of the colorant is further reduced; and part of alumina is uniformly dispersed around the colorant, so that the pinning effect is realized on the colorant, the diffusion of the colorant is further inhibited, the formation of a narrower gradient region 13 is facilitated, and the definition of a striking line between the first region 11 and the second region 12 is improved. In the embodiments of the present application, the mass content of alumina in the first ceramic powder is 20% or less. Thereby, the diffusion of the colorant is prevented, and the performance of the ceramic substrate 10 and the case 100 is not affected, which is advantageous for obtaining the extremely narrow gradation region 13. Further, the mass content of the alumina in the first ceramic powder is 3% -20%. Furthermore, the mass content of the alumina in the first ceramic powder is 5-10%. Specifically, the mass content of the alumina in the first ceramic powder may be, but is not limited to, 2%, 5%, 7%, 9%, 12%, 15%, or 18%. In one embodiment, the first ceramic powder comprises 3-10% by mass of a stabilizer, less than 20% by mass of alumina, 0.1-10% by mass of a first colorant, and the balance zirconia.

In an embodiment of the present application, the first ceramic slurry includes a first ceramic powder and a first organic assistant. 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 ethanol, 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 operation 102, the alumina can act as a barrier to the diffusion of the colorant, and at high temperature, part of the alumina can enter into the spinel structure, further improving the stability of the spinel colorant, and further reducing the colorant diffusion speed; and part of the alumina is uniformly dispersed around the colorant to play a pinning role on the colorant, so that the diffusion of the colorant is further inhibited, the formation of a narrower gradient region 13 is facilitated, and the definition of the color impact line between the first region 11 and the second region 12 is improved. By controlling the mass content of alumina in the second ceramic powder to be more than 3%, the blocking effect of alumina on the colorant during sintering is ensured, so that the gradual change region 13 with the size of less than 200 μm in the first direction can be formed. In the embodiment of the present application, the mass content of alumina in the second ceramic powder is 3% to 20%. Therefore, while the formation of the narrower gradually-changing region 13 is ensured, the processing difficulty is reduced, and the higher mechanical strength of the ceramic substrate 10 and the housing 100 is ensured. Further, the mass content of the alumina in the second ceramic powder is 5-10%. Specifically, the mass content of the alumina in the second ceramic powder may be, but is not limited to, 2%, 5%, 7%, 9%, 12%, 15%, or 18%.

In an embodiment of the present application, the second ceramic powder further includes a second colorant. In one embodiment, the second colorant is present in the second ceramic powder in an amount less than or equal to 10% by mass. Therefore, the second ceramic green bodies prepared subsequently can present obvious colors, and the shrinkage rates of the ceramic green bodies are not different greatly in the sintering process, so that the adverse effect on the performance of the ceramic substrate 10 and the shell 100 is avoided. Furthermore, the mass content of the second colorant in the second ceramic powder is 0.5-8%. Furthermore, the mass content of the second colorant in the second ceramic powder is 1-5%. In an embodiment of the present application, the second colorant may be a spinel colorant, a non-spinel colorant, or a mixture of both. In another embodiment of the present application, the second ceramic powder is free of colorants. In one embodiment, the second colorant comprises a spinel colorant, or is absent, in favor of a narrower transition zone 13, and the appearance of a sharper striking line. In an embodiment of the present application, the difference between the first colorant and the second colorant is greater than 2%. Further, the difference value between the first coloring agent and the second coloring agent is more than 4%, so that the color impact effect is further improved. 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 coloring agent and the second coloring agent. 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 colorant and the second colorant is lower than the sintering temperature, so that the graded region 13 may occur during sintering.

In an embodiment of the present application, the second ceramic powder includes zirconia, alumina, a stabilizer, and a second colorant. In one embodiment, the second ceramic powder comprises 3-10% by mass of a stabilizer, more than 3% by mass of alumina, less than 10% by mass of a second colorant, and the balance zirconia. In another embodiment, the second ceramic powder comprises 3-10% of stabilizer, 3-20% of alumina, 0.1-10% 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 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 agent 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 evenly disperse in the second organic auxiliary agent, 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 defoaming agent, 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 103, the first ceramic slurry and the second ceramic slurry are made into a ceramic substrate green body, including: 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. In this 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 one embodiment, the method further comprises, before the dry-pressing, 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 not limited to processing for 10s-150s under 5MPa-20MPa, and the pressing can be but not limited to processing for 5s-150s under 50MPa-200MPa, so that a ceramic substrate green body with high strength is prepared, and the mechanical properties of the ceramic substrate 10 and the shell 100 are improved.

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 first ceramic slurry and the second ceramic slurry have a viscosity of 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, the first ceramic body and/or the second ceramic body with the thickness of 0.5mm to 1.2mm are/is prepared at the tape casting speed of 0.4m/min to 1m/min and the tape casting drying zone temperature of 70 ℃ to 100 ℃.

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 is not limited to 150-200 ℃, and the injection pressure can be but is 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 can be obtained, for example, but not limited to, planar, three-dimensional, curved, and unequal-thickness ceramic substrate green sheets, and ceramic substrate green sheets of circular, semicircular, oval, triangular, square, rectangular, and irregular polygonal shapes can also be obtained, so as to improve the variety of choices of the case 100.

Fig. 10 is a schematic structural diagram of a ceramic substrate green body according to an embodiment of the present disclosure, in which (a) - (i) in fig. 10 are schematic structural diagrams of ceramic substrate green bodies with different splicing manners, 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. 10 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 104, 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 the 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 wide 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 consistency of the ceramic surface and the internal color is ensured. 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 further 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 above embodiments. This casing 100 can give the outward appearance of electronic equipment multiple colour, and the effect of strikeing simultaneously is obvious, and has clear strikeing lines between the adjacent different colour region, has promoted electronic equipment's expressive force.

Examples

Weighing 4 percent (Co) according to the mass percentage _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ The ceramic green body A-1 is prepared by mixing a colorant, 7% 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 9 percent by mass(Co _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ The ceramic green body A-2 is prepared by mixing a colorant, 7% 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 15 percent (Co) by mass _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ The ceramic green body A-3 is prepared by mixing a colorant, 7% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with an organic assistant and performing dry pressing.

Weighing 4 percent (Co) according to the mass percentage _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ The ceramic green body A-4 is prepared by mixing a colorant, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with an organic assistant and performing dry pressing.

Weighing 4 percent (Co) according to the mass percentage _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ The ceramic green body A-5 is prepared by mixing a colorant, 3% 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.

Weighing 4 percent (Co) according to the mass percentage _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ The ceramic green body A-6 is prepared by mixing a colorant, 7% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with an organic assistant and performing dry pressing.

Weighing 4 percent (Co) according to the mass percentage _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ The ceramic green body A-7 is prepared by mixing a colorant, 7% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with an organic assistant and performing dry pressing.

Weighing 4 percent (Co) according to the mass percentage _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ Colorant, 7% alumina, 2% hafnium oxide, 5% oxideYttrium and the balance of zirconia, and mixing the yttrium and the balance of zirconia with an organic auxiliary agent, and performing dry pressing to obtain a ceramic green body A-8.

Weighing 4 percent (Co) according to the mass percentage _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ The ceramic green body A-9 is prepared by mixing a colorant, 7% of aluminum oxide, 2% of hafnium oxide, 5% of yttrium oxide and the balance of zirconium oxide with an organic assistant and performing dry pressing.

Weighing 4% of Cr by mass ₂ O ₃ The ceramic green body B-1 is prepared by mixing a colorant, 2% 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.

Weighing 4% of Cr according to mass percentage ₂ O ₃ The ceramic green body B-2 is prepared by mixing a colorant, 7% 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.

Weighing 2% 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 and forming to obtain a ceramic green body C-1.

Weighing 7% 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 forming to obtain a ceramic green body C-2.

Weighing 25% 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 and forming to obtain a ceramic green body C-3.

Weighing 2 percent of CoAl according to mass percentage ₂ O ₄ Colorant 2% of Cr ₂ O ₃ The ceramic green body D-1 is prepared by mixing a colorant, 2% 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 2 percent of CoAl according to mass percentage ₂ O ₄ Colorant 2% of Cr ₂ O ₃ Colorant, 7% aluminum oxide, 2% hafnium oxide, 5% yttrium oxide, and balance of oxideZirconium, and mixing the zirconium with a binder, a dispersant and a lubricant, and performing dry pressing to obtain a ceramic green body D-2.

Wherein, the above (Co) _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ Colorant, coAl ₂ O ₄ The colorant is spinel colorant, cr ₂ O ₃ The colorant is a non-spinel colorant; the grain size of the colorant in the ceramic green body A-6 is 50nm, the grain size of the colorant in the ceramic green body A-7 is 2500nm, and the rest is (Co) _0.7 Zn _0.3 )(Fe _0.7 Al _0.3 ) ₂ O ₄ The grain sizes of the coloring agents are all 800nm; cr ₂ O ₃ The grain diameter of the colorant is 600nm; the grain size of the alumina in the ceramic green body A-8 is 60nm, the grain size of the alumina in the ceramic green body A-9 is 2200nm, and the grain sizes of the alumina in the rest ceramic green bodies are 300nm.

The ceramic green compacts prepared above were spliced together in the combination manner shown in table 1 to form ceramic substrate green compacts. And (3) treating the ceramic substrate green body at 400 ℃ for 15h, and then at 1400 ℃ for 4h to obtain a ceramic substrate and obtain 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: placing the glass substrate under an optical microscope, amplifying the glass substrate to a proper multiple, determining boundary lines of the gradient area and the first area and the second area, measuring the distance between the two boundary lines, measuring three different positions on each boundary line, and calculating an average value.

The A-1/C-1 thus obtained was examined under an electron scanning microscope, and the results are shown in FIG. 11, with a scale of 1 μm and black dots of alumina therein.

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-3 exceeds 10%, and the content of the alumina in the B-1 in the ceramic green body is less than 3%, so that the width of the transition region of A-3/C-1, A-3/C-2, A-1/B-1 and A-2/B-1 is more than 200 μm, and a narrower transition region with clear limit cannot be reached. The content of alumina in the ceramic green bodies C-1, C-2 and C-3 is increased in sequence, so that the widths of the gradual change regions in A-1/C-1, A-1/C-2 and A-1/C-3 are gradually reduced, and the mechanical property of A-1/C-3 is slightly reduced. Compared with A-6/C-1, A-1/C-1, the colorant is not easy to agglomerate, and the prepared shell has better mechanical property. Compared with A-7/C-1, A-1/C-1, the appearance is more greasy. Compared with A-8/C-1 and A-1/C-1, the width of the gradual change area is narrower, the color impact effect is more obvious, and the lines of the gradual change area are clearer. Compared with A-9/C-1, A-1/C-1, the color distribution is uniform, and the mechanical property of the prepared shell is better.

The mechanical properties of A-1/C-1 are examined, and the bending strength of A-1/C-1 is 850MPa, and the fracture toughness is more than 7MPa.m ^1/2 The Vickers hardness is 600Hv0.1, the porosity is less than 1 percent, and the surface roughness is less than 0.01 mu m after processing treatment; meanwhile, as can be seen from an electron microscope image of A-1/C-1, the aluminum oxide is uniformly dispersed in the aluminum oxide, so that the diffusion of the colorant is blocked in the preparation process, and the generation of a gradual change area with clear boundary and small width is facilitated.

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, the 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 gradient area presents gradient from a first color to a second color along the first direction, the size of the gradient area in the first direction is less than 200 mu m, the first area comprises a first colorant, the first colorant is a spinel colorant, the particle size of the first colorant is 100nm-2000nm, the mass content of the first colorant in the first area is 0.1-10%, the second area comprises alumina, the mass content of the alumina in the second area is 3-20%, the particle size of the alumina is 100nm-2000nm, and part of the alumina enters the spinel structure of the spinel colorant.

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 first region further comprises alumina, and wherein the mass content of alumina in the first region is less than or equal to 20%.

4. The housing of claim 1, wherein the second region further comprises a second colorant, and wherein the second colorant comprises less than or equal to 10% by mass of the second region.

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

6. The housing of claim 1, wherein the ceramic substrate has a flexural strength greater than 800MPa and a fracture toughness greater 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, wherein the first ceramic slurry comprises first ceramic powder, the first ceramic powder comprises a first coloring agent, the first coloring agent is a spinel coloring agent, the particle size of the first coloring agent is 100nm-2000nm, and the mass content of the first coloring agent in the first ceramic powder is 0.1% -10%;

providing second ceramic slurry, wherein the second ceramic slurry comprises second ceramic powder, the second ceramic powder comprises alumina, the mass content of the alumina in the second ceramic powder is 3% -20%, and the particle size of the alumina is 100nm-2000nm;

ceramic substrate green body binder removal, obtain ceramic substrate after the sintering, make the casing, the casing includes ceramic substrate, ceramic substrate includes first region, second area and is located first region with gradual change district between the second area, first region presents first colour, the second area presents the second colour, first region with the second area has the colour difference, first region extremely the direction of second area is first direction, follows first direction the gradual change district presents the gradual change of first colour to second colour, the gradual change district is in size in first direction is less than 200 mu m, part the aluminium oxide gets into in the spinel structure of spinel colorant.

8. 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.

9. the method of manufacturing 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.

10. 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 ℃.

11. The method of claim 7, wherein the first ceramic green body and the second ceramic green body have a bond strength of greater than 800MPa after the sintering.

12. An electronic device, comprising a housing and a motherboard, wherein the housing comprises a ceramic substrate, and 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 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 gradient area presents gradient from a first color to a second color along the first direction, the size of the gradient area in the first direction is less than 200 mu m, the first area comprises a first colorant, the first colorant is a spinel colorant, the particle size of the first colorant is 100nm-2000nm, the mass content of the first colorant in the first area is 0.1-10%, the second area comprises alumina, the mass content of the alumina in the second area is 3-20%, the particle size of the alumina is 100nm-2000nm, and part of the alumina enters the spinel structure of the spinel colorant.