CN111763085A

CN111763085A - Ceramic shell, preparation method and electronic equipment

Info

Publication number: CN111763085A
Application number: CN202010687257.4A
Authority: CN
Inventors: 张文宇
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2020-10-13
Anticipated expiration: 2040-07-16
Also published as: CN111763085B

Abstract

The present application provides a ceramic housing comprising: a first color layer, the visible light transmittance of which is greater than 10%; the second color layer is formed on the surface of the first color layer; the materials of the first color layer and the second color layer both comprise main materials and pigments, and the content of the pigments in the first color layer is smaller than that of the pigments in the second color layer. A preparation method of the ceramic shell and electronic equipment are also provided.

Description

Ceramic shell, preparation method and electronic equipment

Technical Field

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

Background

The zirconia ceramic has high hardness, high strength and a texture like jade, and is an ideal shell material of high-end consumer electronic products; the existing ceramic shell mainly comprises black and white, is monotonous in color and is easy to cause aesthetic fatigue. Although the color of the zirconia ceramic shell can be enriched by adding the colorant, only a pure-color ceramic shell can be obtained, and the obtained shell color is lack of layering. In addition, the zirconia ceramics have a transparent feeling similar to a gem stone due to the light transmission of the zirconia ceramics, the transparent feeling is damaged by adding excessive coloring agents, and the dyeing purpose cannot be achieved due to the low content of the coloring agents.

Disclosure of Invention

In view of the above problems, the present application provides a ceramic case, a method of manufacturing the same, and an electronic device, which can have rich colors and a sense of non-transparency.

The application provides a ceramic housing, including: a first color layer, the visible light transmittance of which is greater than 10%; the second color layer is formed on the surface of the first color layer; the materials of the first color layer and the second color layer both comprise main materials and pigments, and the content of the pigments in the first color layer is smaller than that of the pigments in the second color layer.

The application also provides a preparation method of the ceramic shell, which comprises the following steps: providing a raw material for forming a first color layer and a raw material for forming a second color layer, wherein the two raw materials comprise a main material and a pigment; preparing a main material and a pigment for forming a first color layer into a first color layer green body, preparing a main material and a pigment for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank, so as to obtain the ceramic shell; the visible light transmittance of the first color layer is larger than 10%, and the pigment content in the first color layer is smaller than that in the second color layer.

The present application also provides an electronic device comprising a ceramic housing as described above.

In the ceramic shell, the preparation method and the electronic device of the embodiment of the application, the first color layer which can transmit visible light when the visible light transmittance is greater than 10% is arranged on the outer side of the ceramic shell, so that the ceramic shell has better surface permeability, the second color layer is arranged on the inner side of the ceramic shell, and the color of the second color layer can be overlapped and transmitted out through the first color layer, so that the ceramic shell can present specific color and rich layering; the materials of the first color layer and the second color layer both comprise main materials and pigments, so that the first color layer and the second color layer both have specific colors, and the first color layer and the second color layer are superposed to form richer colors; in addition, the pigment content in the first color layer is smaller than the pigment content in the second color layer, so that the first color layer and the second color layer have layering, and the permeability of the first color layer is better than that of the second color layer, thereby meeting the requirement of superposition of the color of the first color layer and the color of the second color layer and ensuring the permeability of the ceramic shell.

Drawings

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

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

Fig. 2 to 7 are schematic cross-sectional structural diagrams of several ceramic housings provided in the first embodiment of the present application.

Fig. 8 is a schematic flow chart of a method for processing a ceramic shell according to a second embodiment of the present disclosure.

Fig. 9 is a schematic cross-sectional structural diagram of an electronic device according to a third embodiment of the present application.

Detailed Description

In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

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

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

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

A first embodiment of the present application provides a ceramic case comprising a first color layer and a second color layer; the visible light transmittance of the first color layer is greater than 10%, that is, the first color layer can transmit visible light; the second color layer is formed on the surface of the first color layer; the materials of the first color layer and the second color layer both comprise main materials and pigments, and the content of the pigments in the first color layer is smaller than that of the pigments in the second color layer.

The outer side of the ceramic shell in the embodiment of the application is provided with the first color layer which can transmit visible light when the visible light transmittance is more than 10%, so that the ceramic shell has better surface permeability, the inner side of the ceramic shell is provided with the second color layer, and the colors of the second color layer can be overlapped and transmitted out through the first color layer, so that the ceramic shell can present specific colors and layering; the materials of the first color layer and the second color layer both comprise main materials and pigments, so that the first color layer and the second color layer both have specific colors, and the first color layer and the second color layer are superposed to form richer colors; in addition, the pigment content in the first color layer is smaller than the pigment content in the second color layer, so that the first color layer and the second color layer have layering, and the permeability of the first color layer is better than that of the second color layer, thereby meeting the requirement of superposition of the color of the first color layer and the color of the second color layer and ensuring the permeability of the ceramic shell.

Referring to fig. 1 to 7, a ceramic case 100 according to a first embodiment of the present disclosure is provided, where the ceramic case 100 includes a first color layer 11 and a second color layer 12.

In this embodiment, the second color layer 12 is formed on the surface of the first color layer 11; the materials of the first color layer 11 and the second color layer 12 both include a main material and a colorant, that is, the first color layer 11 and the second color layer 12 both have a predetermined color.

In some embodiments, the ceramic housing 100 includes an inner surface and an outer surface, when the ceramic housing 100 is used in an electronic device, the inner surface may form a receiving cavity for receiving some components, the outer surface may serve as an external surface of the electronic device, the second color layer 12 is adjacent to the inner surface of the ceramic housing 100, and the first color layer 11 is adjacent to the outer surface of the ceramic housing 100, that is, the first color layer 11 side may serve as an external surface of the electronic device.

In this embodiment, the visible light transmittance of the first color layer 11 is greater than 10%, that is, the first color layer 11 can transmit visible light; the visible light transmittance of the second color layer 12 is smaller than that of the first color layer 11.

The visible light transmittance is associated with the color development of the color layer to a certain extent, and generally, when the visible light transmittance of the color layer 11 is low, the color is dense, and when the visible light transmittance of the color layer is high, the color is transparent and the color is light.

In a preferred embodiment, the visible light transmittance of the first color layer 11 is greater than 10% and less than 30%, so that the transparency of the first color layer 11 is general but the color is more prominent, and the color obtained by superimposing the first color layer 11 and the second color layer 12 is richer.

In another embodiment, the visible light transmittance of the first color layer 11 is greater than or equal to 30% and less than 70%, so that the first color layer 11 has a higher transparency while presenting a color, the first color layer 11 is more transparent, and the layering of the color formed by overlapping the first color layer 11 and the second color layer 12 is stronger.

Generally, the pigment content is high, the color is more concentrated, and the visible light transmittance is correspondingly reduced; in this embodiment, the pigment content in the first color layer 11 is smaller than the pigment content in the second color layer 12.

In some embodiments, the content of colorant of the first color layer 11 is greater than zero and less than or equal to 0.5%; the content of the pigment enables the first color layer 11 to present colors and have better permeability; wherein, if the colorant of the first color layer 12 is not larger than 0.5%, otherwise the light transmittance of the first color layer 11 will be too small, and the color of the second color layer 12 will hardly penetrate from the first color layer 12.

In a preferred embodiment, the content of the pigment in the first color layer is greater than or equal to 0.2% and less than or equal to 0.5%; the content of the pigment enables the first color layer 11 to present a more significant color, so that the color obtained by overlapping the first color layer 11 and the second color layer 12 is richer.

In another embodiment, the colorant content of the first color layer is greater than zero and less than 0.2%; the content of the pigment makes the first color layer 11 have high transparency while presenting colors, makes the first color layer 11 more transparent, and makes the layering of the colors obtained by superposing the first color layer 11 and the second color layer 12 stronger.

In some embodiments, the colorant content of the second color layer 12 is greater than or equal to 2% and less than or equal to 10%; the content of the pigment is such that the second color layer 12 is full in color; wherein, if the content of the colorant of the second color layer 12 is less than 2%, the color of the second color layer 12 will be too light to penetrate from the first color layer 11; the content of the pigment in the second color layer 12 is not more than 10%, otherwise, the difference between the components of the second color layer 12 and the first color layer 11 is too large, which causes too large difference between the sintering temperature and the shrinkage rate, and deformation and dry cracking are likely to occur during sintering, which affects the mechanical strength of the ceramic shell 100.

In a preferred embodiment, the content of the colorant in the second color layer 12 is greater than or equal to 3% and less than or equal to 6%; the content of the pigment can ensure the color of the second color layer 12, and at the same time, the ceramic shell 100 has better mechanical strength.

In some preferred embodiments, the first color layer 11 presents a color other than black or white, so as to make the color of the ceramic shell 100 richer; wherein the color of the first color layer 11 is related to the colorant component of the first color layer 11.

In other embodiments, the color presented by the first color layer 11 may also be white, however, the color presented by the first color layer 11 and the second color layer 12 is basically the color of the second color layer 12; in other embodiments, the color of the first color layer 11 may also be black, which is used to darken the overall color of the ceramic housing 100.

In some embodiments, the main material of the first color layer 11 and the second color layer 12 is zirconia, and the main material of the first color layer 11 and the second color layer 12 is the same; the content range of the main material in the first color layer is 89.5-96%; the content range of the main material in the second color layer is 80-93%. The zirconia in this embodiment has a tetragonal crystal structure, wherein the dense zirconia ceramic composed of a fine-grained tetragonal phase in this embodiment has the characteristics of high strength and toughness, high bending strength and fracture toughness, good wear resistance, high hardness, low thermal conductivity, and the like.

In some embodiments, the colorants of the first color layer 11 and the second color layer 12 each comprise at least one of iron oxide, cobalt oxide, nickel oxide, zinc oxide, manganese oxide, chromium oxide, silicon oxide, and copper oxide.

In some embodiments, the colorants of the first color layer 11 and the second color layer 12 each comprise at least one of strontium oxide and gallium oxide.

In some embodiments, the colorants of the first color layer 11 and the second color layer 12 both comprise one of the rare earth oxides.

In some embodiments, the colorants of the first color layer 11 and the second color layer 12 each comprise one of aluminum oxide, magnesium oxide, and calcium oxide.

In some embodiments, the colorants of the first color layer 11 and the second color layer 12 both comprise a colorant having a chemical formula AB₂O₄Wherein A is one or more of zinc (Zn), cobalt (Co), nickel (Ni) and calcium, and B is one or more of aluminum (Al), iron (Fe) and manganese (Mn); for example, the formula is AB₂O₄The material is cobalt aluminate, nickel aluminate, calcium aluminate, zinc chromate, cobalt chromate, nickel chromate, calcium chromate, zinc ferrite, cobalt ferrite, nickel ferrite, calcium ferrite, zinc manganate, cobalt manganate, nickel manganate, calcium manganate, (Zn, Co, Ni) (Al, Fe, Mn)₂O₄And so on.

In a preferred embodiment, the color component of the first color layer 11 is different from the color component of the second color layer 12, so that the first color layer 11 and the second color layer 12 can present different colors.

In other embodiments, the pigment components of the first color layer 11 and the second color layer 12 may be the same, but the contents thereof are different, so as to present a color difference, which also enables the ceramic shell 100 to have a distinctive appearance color.

In some embodiments, each of the first color layer 11 and the second color layer 12 further comprises hafnium oxide, the content of hafnium oxide in each of the first color layer 11 and the second color layer 12 being in a range of 0 to 3%; it should be noted that hafnium oxide is a symbiont of zirconium oxide, and has very similar physicochemical properties to zirconium oxide, and it is difficult to separate them during the preparation process, and because the content thereof has little influence on the overall performance of the ceramic, it is not necessary to remove or add them intentionally.

In some embodiments, the first color layer 11 and the second color layer 12 each further comprise a stabilizer, which may be yttria; the content range of the stabilizer in the first color layer 11 and the second color layer 12 is 4% to 7%; too low content of the stabilizer in the first color layer 11 and the second color layer 12 is not favorable for stability of ceramic crystallization, and is easy to crack during sintering and processing, and too high content of the stabilizer in the first color layer 11 and the second color layer 12 reduces mechanical properties such as strength and toughness of the ceramic shell 100.

In some embodiments, the thickness of the first color layer 11 is less than or equal to 1 millimeter; after the thickness of the first color layer 11 is greater than 1 mm, the light transmittance thereof is greatly reduced, which is not favorable for the color of the second color layer 12 to be transmitted.

In some preferred embodiments, the thickness of the first color layer 11 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

In some embodiments, the thickness of the first color layer 11 is different at least two locations, so that the color depth of the first color layer 11 is different at least two locations, and the color of the first color layer 11 is different at least two locations after the first color layer is overlapped with the color of the second color layer 12, so that the ceramic shell is in multiple colors.

In some embodiments, the thickness of the second color layer 12 is different at least two positions, so that the color depth of the second color layer 12 is different at least two positions, and the color of the second color layer 12 is different after being overlapped with the first color layer 11, so that the ceramic shell 100 has multiple colors.

In some embodiments, referring to fig. 2 to 7, the ceramic shell 100 includes a plurality of side portions 101 and a middle portion 102 substantially vertically connected between the plurality of side portions 101, and the plurality of side portions 101 and the middle portion 102 are smoothly transited; wherein the thickness of the first color layer 11 at the middle part 102 is different from the thickness at the plurality of side parts 101, so that the color of the side parts 101 of the ceramic case 100 is different from the color of the middle part 102.

In some embodiments, the plurality of side portions 101 and the middle portion 102 enclose a receiving cavity for receiving a component, the second color layer 12 is disposed on one side of an inner wall of the receiving cavity, and the first color layer 11 is disposed on an opposite side of the inner wall of the receiving cavity.

In some embodiments, referring to fig. 2 to 7, the thickness of the second color layer 12 at the middle portion 102 is different from the thickness at a plurality of the side portions 101, which also makes the color of the side portions 101 of the ceramic shell 100 different from the color of the middle portion 102.

In other embodiments, as shown in fig. 2 and 3, the thickness of the second coloring layer 12 may be different at different positions of the middle portion 102, so that different color effects are presented at different positions of the middle portion 102 of the ceramic shell 100. Of course, the thickness of the first color layer 11 at different positions of the middle portion 102 may also be different.

In some preferred embodiments, as shown in fig. 2 to 7, the first color layer 11 and the second color layer 12 are smoothly transited in the regions with different thicknesses, that is, the thicknesses of the first color layer 11 and the second color layer 12 are gradually changed, so that the displayed color is also gradually changed, so that the ceramic shell 100 is gradually changed in color as a whole.

In one embodiment, referring to fig. 4, the first color layer 11 is formed only on the middle portion 102, the second color layer 12 is formed on the middle portion 102 and the plurality of side portions 101, and the first color layer 11 and the second color layer 12 are smoothly transited in regions with different thicknesses; thus, the side part 101 of the ceramic shell 100 is colored by the second color layer 12, the middle part 102 of the ceramic shell 100 is colored by the first color layer 11 and the second color layer 12, and the whole ceramic shell 100 is gradually changed by at least two colors.

In one embodiment, referring to fig. 5, the first color layer 11 is formed only on the plurality of side portions 101, the second color layer 12 is formed on the middle portion 102 and the plurality of side portions 101, and the first color layer 11 and the second color layer 12 are smoothly transited in regions with different thicknesses; thus, the middle part 102 of the ceramic shell 100 is colored by the second color layer 12, the side parts 101 of the ceramic shell 100 are colored by the first color layer 11 and the second color layer 12, and the whole ceramic shell 100 is gradually changed in at least two colors.

In one embodiment, referring to fig. 6, the first color layer 11 is formed on a plurality of the side portions 101 and the middle portion 102, the second color layer 12 is formed only on the middle portion 102, and the first color layer 11 and the second color layer 12 are smoothly transited in regions with different thicknesses; thus, the side part 101 of the ceramic shell 100 is in the color of the first color layer 11, the middle part 102 of the ceramic shell 100 is in the color formed by the superposition of the first color layer 11 and the second color layer 12, and the whole ceramic shell 100 is in a gradient of at least two colors.

In one embodiment, referring to fig. 7, the first color layer 11 is formed on a plurality of the side portions 101 and the middle portion 102, the second color layer 12 is formed only on the side portions 101, and the first color layer 11 and the second color layer 12 are smoothly transited in regions with different thicknesses; thus, the middle portion 102 of the ceramic shell 100 is colored by the first color layer 11, the side portions 101 of the ceramic shell 100 are colored by the first color layer 11 and the second color layer 12, and the whole ceramic shell 100 is gradually changed in at least two colors.

Of course, the first color layer 11 and the second color layer 12 may be disposed in other ways, which are only illustrated here, and other similar variations are within the scope of the present application.

A second embodiment of the present application provides a method for manufacturing a ceramic case, including: providing a main material and a pigment for forming a first color layer and a main material and a pigment for forming a second color layer; preparing a main material and a pigment for forming a first color layer into a first color layer green body, preparing a main material and a pigment for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank, so as to obtain the ceramic shell; the visible light transmittance of the first color layer is larger than 10%, and the pigment content in the first color layer is smaller than that in the second color layer.

According to the preparation method of the ceramic shell, the ceramic shell with rich colors, transparent surface and rich layering can be obtained through a simple process, and the mechanical property of the ceramic shell formed by the preparation method is good.

Referring to fig. 8, a method for manufacturing a ceramic case according to a second embodiment of the present application includes:

s201, providing a raw material for forming a first color layer and a raw material for forming a second color layer, wherein the two raw materials comprise a main material and a pigment;

s202, preparing a main material and a pigment for forming a first color layer into a first color layer green body, preparing a main material and a pigment for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; and

s203, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain the ceramic shell; the visible light transmittance of the first color layer is larger than 10%, and the pigment content in the first color layer is smaller than that in the second color layer.

In some embodiments, the main material for forming the first color layer and the main material for forming the second color layer are both zirconia, and the main material for forming the first color layer and the main material for forming the second color layer are the same; the main material for forming the first color layer and the main material for forming the second color layer are in a powder state, and the ceramic shell formed after sintering in the embodiment mainly comprises fine-grained compact zirconia ceramic composed of tetragonal phase, and has the characteristics of high strength and toughness, high bending strength and fracture toughness, good wear resistance, high hardness, low thermal conductivity coefficient and the like.

In some embodiments, the content of the main material for forming the first color layer in all raw materials for forming the first color layer ranges from 89.5% to 96%; the content of the main material for forming the second color layer in all the raw materials for forming the second color layer ranges from 80% to 93%.

In some embodiments, the colorant used to form each of the first color layer and the second color layer comprises at least one of iron oxide, cobalt oxide, nickel oxide, zinc oxide, manganese oxide, chromium oxide, silicon oxide, and copper oxide.

In some embodiments, the colorant used to form the first color layer and the colorant used to form the second color layer each comprise at least one of strontium oxide and gallium oxide.

In some embodiments, the colorant used to form the first color layer and the colorant used to form the second color layer each comprise one of the rare earth oxides.

In some embodiments, the colorant used to form the first color layer and the colorant used to form the second color layer each comprise one of aluminum oxide, magnesium oxide, and calcium oxide.

In some embodiments, the colorant used to form the first color layer and the colorant used to form the second color layer each comprise a compound of formula AB₂O₄Wherein A is one or more of zinc (Zn), cobalt (Co), nickel (Ni) and calcium, and B is one or more of aluminum (Al), iron (Fe) and manganese (Mn); for example, the formula is AB₂O₄The materials are cobalt aluminate, nickel aluminate, calcium aluminate, zinc chromate, cobalt chromate, nickel chromate,Calcium chromate, zinc ferrite, cobalt ferrite, nickel ferrite, calcium ferrite, zinc manganate, cobalt manganate, nickel manganate, calcium manganate, (Zn, Co, Ni) (Al, Fe, Mn)₂O₄And so on.

In a preferred embodiment, the composition of the colorant used to form the first color layer is different from the composition of the colorant used to form the second color layer, so that the first color layer 11 and the second color layer 12 may exhibit different colors.

In other embodiments, the pigment used to form the first color layer and the pigment used to form the second color layer may have the same composition and different single content, thereby exhibiting color difference and also providing the ceramic shell 100 with a distinctive appearance color.

In some embodiments, the main material for forming the first color layer and the main material for forming the second color layer are zirconium oxide; the raw materials for forming the first color layer and the second color layer respectively further comprise hafnium oxide, and the content of the hafnium oxide in the raw materials for forming the first color layer and the content of the hafnium oxide in the raw materials for forming the second color layer are both 0-3%; it should be noted that hafnium oxide is a symbiont of zirconium oxide, and has very similar physicochemical properties to zirconium oxide, and it is difficult to separate them during the preparation process, and because the content thereof has little influence on the overall performance of the ceramic, it is not necessary to remove or add them intentionally.

In some embodiments, the raw material for forming the first color layer and the raw material for forming the second color layer each further comprise a stabilizer, which may be yttrium oxide; the content range of the stabilizer in the raw material for forming the first color layer and the raw material for forming the second color layer is 4-7%; too low content of the stabilizer is not beneficial to the stability of ceramic crystals and is easy to crack during sintering and processing, and too high content of the stabilizer can reduce the mechanical properties of the ceramic shell, such as strength, toughness and the like.

In some embodiments, the first color layer has a thickness of less than or equal to 1 millimeter; after the thickness of the first color layer is larger than 1 millimeter, the light transmittance of the first color layer is greatly reduced, which is not beneficial to the color transmission of the second color layer; preferably, the thickness of the first color layer 11 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

In some embodiments, the temperature at which the first color layer green body and the second color layer green body are sintered together is 1350 degrees celsius to 1500 degrees celsius; in the ceramic shell obtained by sintering the first color layer green body and the second color layer green body under the condition, the content of air holes of the first color layer is less than 0.1%, and the density is more than 6.0 grams per cubic centimeter (g/cm)³) The content of air holes in the second color layer is less than 0.1 percent, and the density is more than 5.8g/cm³Thereby, the ceramic shell has better mechanical property and more delicate appearance.

In some embodiments, the sintered first color layer and the sintered second color layer are further processed by flat grinding, CNC grinding, polishing, etc. to form a ceramic shell with a specific shape.

The first color layer and the second color layer of the ceramic shell in this embodiment have the same structure, characteristics, and the like as those of the first color layer and the second color layer of the first embodiment, and therefore, refer to the description of the first embodiment, and are not repeated herein.

As shown in fig. 9, the third embodiment of the present application further provides an electronic device 300, where the electronic device 300 includes the ceramic housing 100 according to the first embodiment of the present application.

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

In some embodiments, the electronic device 300 is a portable, mobile computing device, wearable device, etc., such as a smartphone, laptop, tablet, gaming device, etc.

The ceramic shell, and particularly the color of the ceramic shell, will be described with reference to specific embodiments.

Example 1

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.1% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 1; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 1 was tested, the bending strength of the sample 1 was tested, and the Lab value of the sample 1 was tested.

Example 2

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 2; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 2 was tested, the bending strength of the sample 2 was tested, and the Lab value of the sample 2 was tested.

Example 3

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.3% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 3; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 3 was tested, the bending strength of the sample 3 was tested, and the Lab value of the sample 3 was tested.

Example 4

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.5% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 4; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 4 was tested, the bending strength of the sample 4 was tested, and the Lab value of the sample 4 was tested.

Example 5

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 5; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 5 was tested, the bending strength of the sample 5 was tested, and the Lab value of the sample 5 was tested.

Example 6

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 3% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 6; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 6 was tested, the bending strength of the sample 6 was tested, and the Lab value of the sample 6 was tested.

Example 7

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 6% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 7; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 7 was tested, the bending strength of the sample 7 was tested, and the Lab value of the sample 7 was tested.

Example 8

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 10% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 8; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 8 was tested, the bending strength of the sample 8 was tested, and the Lab value of the sample 8 was tested.

Example 9

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 9; wherein the thickness of the first color layer is 0.1 mm, and the thickness of the second color layer is 1.9 mm.

The light transmittance of the first color layer in the sample 9 was tested, the bending strength of the sample 9 was tested, and the Lab value of the sample 9 was tested.

Example 10

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 10; wherein the thickness of the first color layer is 0.5 mm, and the thickness of the second color layer is 1.5 mm.

The light transmittance of the first color layer in the sample 10 was tested, the bending strength of the sample 10 was tested, and the Lab value of the sample 10 was tested.

Example 11

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 11; wherein the thickness of the first color layer is 0.7 mm, and the thickness of the second color layer is 1.3 mm.

The light transmittance of the first color layer in the sample 11 was tested, the bending strength of the sample 11 was tested, and the Lab value of the sample 11 was tested.

Example 12

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 12; wherein, the thickness of first color layer is 1.0 millimeter, the thickness of second color layer is 1.0 millimeter.

The light transmittance of the first color layer in the sample 12 is tested, the bending strength of the sample 12 is tested, and the Lab value of the sample 12 is tested.

Comparative example 1

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.7% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 13; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 13 was tested, the bending strength of the sample 13 was tested, and the Lab value of the sample 13 was tested.

Comparative example 2

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 1.0% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 14; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 14 is tested, the bending strength of the sample 14 is tested, and the Lab value of the sample 14 is tested.

Comparative example 3

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 15.0% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 15; wherein the thickness of the first color layer is 0.3 mm, and the thickness of the second color layer is 1.7 mm.

The light transmittance of the first color layer in the sample 15 was tested, the bending strength of the sample 15 was tested, and the Lab value of the sample 15 was tested.

Comparative example 4

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4.0% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first color layer into a first color layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; then, sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank to obtain a ceramic shell, and marking the ceramic shell as a sample 16; wherein the thickness of the first color layer is 1.5 mm, and the thickness of the second color layer is 0.5 mm.

The light transmittance of the first color layer in the sample 16 is tested, the bending strength of the sample 16 is tested, and the Lab value of the sample 16 is tested.

Comparative example 5

Providing raw materials for forming the first ceramic layer: 5% of yttria stabilizer, 0% of pigment, the balance of zirconia (possibly containing traces of hafnia intergrowths): 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a first ceramic layer into a first ceramic layer green body, preparing a raw material for forming a second color layer into a second color layer green body, and forming the first ceramic layer green body on the surface of the second color layer green body; then, sintering the first ceramic layer green body and the second color layer green body together to form the first ceramic layer green body and the second color layer green body into a second color layer, so as to obtain a ceramic shell, and marking the ceramic shell as a sample 17; wherein, the thickness of first ceramic layer is 0.3 millimeter, the thickness of second colour layer is 1.7 millimeter.

The light transmittance of the first ceramic layer in the sample 17 was tested, the bending strength of the sample 17 was tested, and the Lab value of the sample 17 was tested.

Comparative example 6

Providing raw materials for forming a first color layer: 5% of yttrium oxide stabilizer, 0.2% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/chromium oxide/nickel oxide composite green pigment; preparing raw materials for forming a first color layer into a first color layer green body; then, sintering the first color layer green body to form the first color layer green body into a first color layer, so as to obtain a ceramic shell, and marking the ceramic shell as a sample 18; wherein the thickness of the first color layer is 2.0 millimeters.

The light transmittance of the first color layer in the sample 18 is tested, the bending strength of the sample 18 is tested, and the Lab value of the sample 18 is tested.

Comparative example 7

Providing raw materials for forming the second color layer: 5% of yttrium oxide stabilizer, 4% of pigment and the balance of zirconium oxide (possibly containing trace hafnium oxide intergrowth), wherein the pigment is an aluminum oxide/cobalt oxide composite blue pigment; preparing a raw material for forming a second color layer into a second color layer green body; then, sintering the second color layer green body to form the second color layer green body into a second color layer, so as to obtain a ceramic shell, and marking the ceramic shell as a sample 19; wherein the thickness of the second color layer is 2.0 millimeters.

The sample 19 was tested for bending strength, and the sample 19 was tested for Lab value.

The test results are shown in the following table:

TABLE 1

When the light transmittance of the first color layer is tested, if the second color layer is attached, the second color layer is flatly ground and completely removed, then the two sides of the remaining first color layer are polished to the thickness of 0.2 mm, and then a spectrophotometer is used for measuring the full transmittance of the first color layer under the wavelength light of 580 nanometers; if the second color layer is not attached, the first color layer is directly subjected to double-sided polishing to a thickness of 0.2 mm, and then the full transmittance of the first color layer at a wavelength of 580 nm is measured using a spectrophotometer.

The specific mode of bending strength test is as follows: making each sample into a bending resistant strip: the thickness is 2.0 mm, the width is 20.0 mm, the length is 50.0 mm, and the bending resistance strip is tested by referring to a four-point bending strength test method in the national standard GB _ T6569-2006-fine ceramic bending strength test method.

The Lab value of the sample is measured using a color difference meter in a D65 mode, wherein the Lab test of the sample is performed on the first color layer side of the ceramic case including the first color layer and the second color layer, that is, the color value exhibited by the ceramic case including the first color layer and the second color layer on the first color layer side is measured.

It should be noted that, for convenience of testing and comparison of test results, the first color layer and the second color layer in each of the above-mentioned examples are equal-thickness ceramic layers.

As can be seen from comparing the transmittance test results of samples 1 to 4 and 13, the transmittance of the first color layer decreases with the increase of the colorant content, when the colorant content is 0.5%, the transmittance of the first color layer is still above 10%, when the colorant content is 0.7%, the transmittance of the first color layer is only above 6.1%, and corresponding Lab indicates that the b value is positive, which indicates that blue is not visible at this time, that is, the first color layer cannot substantially transmit the color of the second color layer, so the colorant content of the first color layer in the present application is less than or equal to 0.5%; and comparing samples 1 to 4, it can be seen that the absolute value of the value a gradually decreases as the colorant content of the first color layer decreases, i.e., the color of the first color layer starts to become insignificant, and therefore, the colorant content of the first color layer is preferably greater than or equal to 0.2% and less than or equal to 0.5% in the present application.

Comparing the bending strength test results of samples 1 to 4 and sample 13, it can be seen that the proper amount of the pigment can increase the bending strength of the ceramic shell sample including the first color layer with the increase of the pigment content.

Comparing the bending strength test results of samples 5 to 8, 14 and 15, it can be seen that after the pigment content of the second color layer is relatively large, the bending strength of the ceramic shell sample is significantly reduced along with the increase of the pigment content, when the pigment content of the second color layer is 10%, the bending strength is only 710 mpa, when the pigment content of the second color layer is 15%, the bending strength is only 314 mpa, and the pigment content of the second color layer is too high, so that the difference between the sintering shrinkage rate and the densification temperature of the first color layer green blank and the second color layer green blank is large, and it is difficult to find a proper sintering temperature and sinter the first color layer green blank and the second color layer green blank compactly without overburning; in addition, as can be seen by comparing the Lab test results of samples 5 to 8 and samples 14 and 15, when the colorant content of the second color layer is 1%, the b value in Lab is only-0.1, i.e., the second color layer is not substantially colored; therefore, the colorant content of the second color layer described in the application needs to be 2% or more and 10% or less.

Comparing the light transmittance test results of samples 9 to 12 and 16, it can be seen that as the thickness of the first color layer increases, the color of the second color layer is more and more difficult to penetrate out of the first color layer, and when the thickness of the first color layer is 1.5 mm, the b value in Lab is 0.3, which is a positive value, and the color of the second color layer cannot penetrate out at all; and when the thickness of the first color layer is more than 0.5 mm, such as 0.7 mm and 1.0 mm, the b value in Lab is negative, but the absolute value is smaller, that is, the color of the second color layer is less transmitted out of the first color layer; therefore, the thickness of the first color layer in the present application needs to be equal to or less than 1 mm, and preferably equal to or more than 0.1 mm and equal to or less than 0.5 mm.

Sample 17 through sample 19 are extreme comparative examples that may be used as references herein, such as some data for the first color layer alone, some data for the second color layer alone, and some data for a ceramic shell sample containing a first ceramic layer without colorant; and will not be described in detail herein.

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

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A ceramic shell, comprising:

a first color layer, the visible light transmittance of which is greater than 10%; and

the second color layer is formed on the surface of the first color layer;

the materials of the first color layer and the second color layer both comprise main materials and pigments, and the content of the pigments in the first color layer is smaller than that of the pigments in the second color layer.

2. The ceramic shell of claim 1, wherein the colorant content of the first color layer is greater than zero and less than 0.5%; the content of the pigment of the second color layer is more than 2% and less than 10%.

3. The ceramic shell of claim 2, wherein the colorant content of the first color layer is greater than zero and less than 0.2%; the content of the pigment in the second color layer is more than 3% and less than 6%.

4. The ceramic shell according to any one of claims 1 to 3, wherein the first coloring layer exhibits a color of black or a color; the thickness of the first color layer is less than or equal to 1 mm; the visible light transmittance of the first color layer is more than 10% and less than 30%.

5. The ceramic shell according to any one of claims 1 to 4, wherein the coloring materials of the first coloring layer and the second coloring layer each comprise at least one of iron oxide, cobalt oxide, nickel oxide, zinc oxide, manganese oxide, chromium oxide, silicon oxide, and copper oxide; and/or the coloring materials of the first color layer and the second color layer both comprise at least one of strontium oxide and gallium oxide; and/or the coloring materials of the first color layer and the second color layer both comprise one of rare earth oxides; and/or the pigments of the first color layer and the second color layer comprise one of aluminum oxide, magnesium oxide and calcium oxide; and/or the pigments of the first color layer and the second color layer both comprise a pigment with a chemical formula AB₂O₄Wherein A is one or more of zinc, cobalt, nickel and calcium, and B is one or more of aluminum, iron and manganese.

6. The ceramic shell according to any one of claims 1 to 5, wherein the main material of the first color layer and the second color layer is zirconia, and the main material of the first color layer and the second color layer is the same; the content range of the main material in the first color layer is 89.5-96%; the content range of the main material in the second color layer is 80-93%.

7. The ceramic shell according to any one of claims 1 to 6, wherein each of the first color layer and the second color layer further comprises hafnium oxide, and the content of hafnium oxide in each of the first color layer and the second color layer ranges from 0 to 3%; the first color layer and the second color layer both further comprise yttrium oxide, and the content range of the yttrium oxide in the first color layer and the second color layer is 4% to 7%.

8. Ceramic shell according to any one of claims 1 to 7, wherein the first coloured layer has a different thickness in at least two locations and/or the second coloured layer has a different thickness in at least two locations; the ceramic shell is in various colors as a whole.

9. The ceramic shell according to claim 8, wherein the ceramic shell comprises a plurality of side portions and a middle portion connected substantially perpendicularly therebetween, the plurality of side portions and the middle portion having smooth transitions therebetween; wherein the first color layer has a thickness in the middle portion that is different from a thickness in the plurality of side portions, and/or the second color layer has a thickness in the middle portion that is different from a thickness in the plurality of side portions; the first color layer and the second color layer are in smooth transition between the middle part and the plurality of side parts, and the whole ceramic shell is in a gradually-changed color.

10. The ceramic shell according to claim 9, wherein the first color layer is formed only in the middle portion, and the second color layer is formed in the middle portion and the plurality of side portions; or, the first color layer is formed only on the plurality of side portions, and the second color layer is formed on the middle portion and the plurality of side portions; or, the first color layer is formed on the middle part and the plurality of side parts, and the second color layer is formed only on the middle part; or, the first color layer is formed on the middle part and the plurality of side parts, and the second color layer is formed only on the plurality of side parts.

11. A method of making a ceramic shell, comprising:

providing a raw material for forming a first color layer and a raw material for forming a second color layer, wherein the two raw materials comprise a main material and a pigment;

preparing a main material and a pigment for forming a first color layer into a first color layer green body, preparing a main material and a pigment for forming a second color layer into a second color layer green body, and forming the first color layer green body on the surface of the second color layer green body; and

sintering the first color layer green blank and the second color layer green blank together to form a first color layer from the first color layer green blank and a second color layer from the second color layer green blank, so as to obtain the ceramic shell;

the visible light transmittance of the first color layer is larger than 10%, and the pigment content in the first color layer is smaller than that in the second color layer.

12. The method of manufacturing a ceramic case according to claim 11, wherein a content of a colorant for forming the first color layer in a raw material for forming the first color layer is greater than zero and less than 0.5%; the content of the coloring material for forming the second color layer in the raw material for forming the second color layer is more than 2% and less than 10%.

13. The method of claim 11 or 12, wherein the thicknesses of at least two positions of the first color layer are different and/or the thicknesses of at least two positions of the second color layer are different, so that the ceramic shell has a plurality of colors as a whole.

14. The method of claim 13, wherein the ceramic shell comprises a plurality of side portions and a middle portion substantially perpendicularly connected between the plurality of side portions, the plurality of side portions smoothly transition with the middle portion; wherein the first color layer has a thickness in the middle portion that is different from a thickness in the plurality of side portions, and/or the second color layer has a thickness in the middle portion that is different from a thickness in the plurality of side portions; the first color layer and the second color layer are in smooth transition between the middle part and the plurality of side parts, and the whole ceramic shell is in a gradually-changed color.

15. An electronic device characterized in that it comprises a ceramic case according to any one of claims 1 to 10.