CN114907101A - Shell assembly, preparation method and electronic equipment - Google Patents

Shell assembly, preparation method and electronic equipment Download PDF

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Publication number
CN114907101A
CN114907101A CN202110172057.XA CN202110172057A CN114907101A CN 114907101 A CN114907101 A CN 114907101A CN 202110172057 A CN202110172057 A CN 202110172057A CN 114907101 A CN114907101 A CN 114907101A
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China
Prior art keywords
glaze
parts
neodymium
ceramic
oxide
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CN202110172057.XA
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Chinese (zh)
Inventor
赵岩峰
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Priority to CN202110172057.XA priority Critical patent/CN114907101A/en
Publication of CN114907101A publication Critical patent/CN114907101A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C8/00Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/58007Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on refractory metal nitrides
    • C04B35/58028Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on refractory metal nitrides based on zirconium or hafnium nitrides
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00Casings, cabinets or drawers for electric apparatus

Abstract

The application provides a housing assembly, includes: a ceramic base body, the main component of which is at least one of alumina, zirconia and zirconium nitride; and neodymium-doped color-changing glaze layer formed on the surface of the ceramic substrate; the neodymium-doped color-changing glaze layer can change color under the irradiation of different light sources. A method for manufacturing the housing assembly and an electronic device are also provided.

Description

Shell assembly, preparation method and electronic equipment
Technical Field
The application relates to the technical field of electronics, in particular to a shell assembly, a manufacturing method and electronic equipment.
Background
The ceramics such as zirconia and the like have high hardness and high strength and are warm and moist like jade, and are ideal shell materials of high-end consumer electronic products; the existing ceramic shell assembly mainly comprises black and white, has monotonous color and is easy to cause aesthetic fatigue, and although the color of the ceramic shell assembly can be enriched by adding coloring agents, only the shell assembly which is pure in color and cannot be changed can be obtained.
Disclosure of Invention
In view of the above problems, the present application provides a housing assembly, a manufacturing method and an electronic device, which can change color under irradiation of different light sources, and have a better appearance.
The application provides a housing assembly, includes: a ceramic base body, the main component of which is at least one of alumina, zirconia and zirconium nitride; and a neodymium-doped color-changing glaze layer formed on the surface of the ceramic substrate; the neodymium-doped color-changing glaze layer can change color under the irradiation of different light sources.
The application also provides a preparation method of the shell assembly, which comprises the following steps: preparing a ceramic blank; sintering the ceramic blank to obtain a ceramic matrix, wherein the main component of the ceramic matrix is at least one of alumina, zirconia and zirconium nitride; providing a glaze and applying the glaze to the surface of the ceramic substrate, wherein the glaze comprises a neodymium discolouring agent therein; and sintering the glaze to form a neodymium-doped color-changing glaze layer to obtain the shell assembly.
The application also provides an electronic device, which comprises the shell assembly or the shell assembly prepared by the preparation method of the shell assembly.
In the housing assembly, the preparation method and the electronic device of the embodiment of the application, the main component of the ceramic substrate is at least one of alumina, zirconia and zirconium nitride, so that the ceramic substrate has the properties of high strength, high gloss, high fracture toughness, excellent heat insulation performance, high temperature resistance and the like, has low dielectric constant, is normally mature, does not shield signals and is a structural material with good 5G communication; in addition, the neodymium-doped color-changing glaze layer can change colors under the irradiation of different light sources, and has better appearance.
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 housing assembly according to a first embodiment of the present application.
Fig. 2 is a schematic flow chart of a method for preparing a housing assembly according to a second embodiment of the present application.
Fig. 3 is a schematic view of a process for applying the glaze to the surface of the ceramic substrate according to the second embodiment of the present application.
Fig. 4 is a schematic top view of an electronic device according to a third embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, 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 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 "including" and "having," and any variations thereof, in the description and claims of this application and the drawings described above, 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 case component, including a ceramic base having at least one of alumina, zirconia, and zirconium nitride as a main component; and neodymium-doped color-changing glaze layer formed on the surface of the ceramic substrate; the neodymium-doped color-changing glaze layer can change color under the irradiation of different light sources.
The main component of the ceramic matrix of the shell component in the embodiment of the application is at least one of alumina, zirconia and zirconium nitride, so that the ceramic matrix has the properties of high strength, high gloss, high fracture toughness, excellent heat insulation performance, high temperature resistance and the like, has low dielectric constant, does not shield signals and is a structural material with good 5G communication; the neodymium-doped color-changing glaze layer of the shell assembly can change colors under the irradiation of different light sources, and has better appearance; therefore, the shell assembly has better mechanical and physical properties, and the surface color can be changed along with the difference of the light source, so that the shell assembly has higher appearance.
Referring to fig. 1, a housing assembly 100 according to a first embodiment of the present application includes a ceramic substrate 11 and a neodymium-doped color-changing glaze layer 12, where the ceramic substrate 100 is formed of a ceramic material.
In the present application, the main component of the ceramic substrate 11 is at least one of alumina, zirconia, and zirconium nitride; among them, the alumina, zirconia, and zirconium nitride ceramics have properties such as high strength, high gloss, high fracture toughness, and excellent heat insulation performance and high temperature resistance, and also have properties such as low dielectric constant and no signal shielding, so that the ceramic substrate 11 of the present application is particularly suitable for use as a structural member or a decorative member of an electronic device.
In some embodiments, the ceramic substrate 11 is formed from a raw material including ceramic powder and a binder; wherein the ceramic powder is at least one of alumina powder, zirconia powder and zirconium nitride powder; the mass part range of the ceramic powder in the raw material is 70-99 parts, the mass part range of the binder in the raw material is 1-30 parts, and the sum of the weight parts of the ceramic powder and the binder is 100 parts.
In some embodiments, the ceramic substrate 11 may be obtained by sintering the above raw materials at a temperature of 1200 ℃ or higher for 0.5 to 10 hours.
In some embodiments, the main component of the ceramic powder is zirconia with a tetragonal crystal structure, which can form a dense zirconia ceramic having 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 ceramic powder further comprises a colorant, a stabilizer, and the like.
Wherein, in some embodiments, the colorant can be iron oxide, cobalt oxide, nickel oxide, zinc oxide, manganese oxide, chromium oxide, silicon oxide, copper oxide, strontium oxide, gallium oxide, rare earth oxide, aluminum oxide, magnesium oxide, and calcium oxide or AB 2 O 4 At least one of the materials of (a); wherein, the chemical formula is AB 2 O 4 In the material (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 chemical formula is AB 2 O 4 The 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) 2 O 4 And so on.
In some embodiments, the stabilizer may be yttria or the like, wherein the stabilizer is beneficial to the stability of the ceramic crystal, so that the ceramic matrix 11 is not easy to crack during sintering and processing.
In some embodiments, the total mass fraction of the components such as the colorant and the stabilizer may be 01.2 parts.
In some embodiments, the binder may be one or more of paraffin, polyethylene glycol, stearic acid, dioctyl phthalate, polyethylene, polypropylene, polymethyl methacrylate, polyoxymethylene.
In this embodiment, the neodymium-doped color-changing glaze layer 12 is formed on the surface of the ceramic substrate 11, and the neodymium-doped color-changing glaze layer 12 can change color under different light sources.
Wherein, in some embodiments, the neodymium-doped color-changing glaze layer 12 may be formed on the whole appearance surface of the ceramic substrate 11; in other embodiments, the neodymium-doped color-changing glaze layer 12 may also have a predetermined shape to be formed on a partial surface of the ceramic substrate 11, wherein the predetermined shape may be an abstract pattern, a physical pattern, a painting, a character symbol, or the like; the neodymium-doped color-changing glaze layer 12 can also be a pattern with a hollow part, namely a hollow pattern; and are not intended to be limiting herein.
In some embodiments, the neodymium-doped color change glaze layer 12 is formed by a glaze comprising a mineral solvent and a neodymium color change agent; wherein, the total mass fraction of the mineral solvent and the neodymium discoloring agent contained in the glaze is 100, and the mass fraction range of the neodymium discoloring agent contained in the glaze is 1 to 20, the mass fraction of the neodymium discoloring agent cannot be too high, otherwise, the mechanical property of the neodymium-doped discoloring glaze layer 12 is reduced; the mass parts of the neodymium discoloring agent can be selected according to discoloring requirements, if more obvious discoloring effect is required, a higher part can be selected within the mass part range, and if light discoloring effect is required, a lower part can be selected within the mass part range.
In some embodiments, the neodymium discoloring agent is neodymium oxide or neodymium silicon compound.
In a preferred embodiment, the neodymium discoloring agent is neodymium silicate (Nd) 2 Si 2 O 7 ) (ii) a The neodymium variable colorant can be prepared by a high-temperature solid phase method, a liquid phase method and the like.
The mineral solvent may be a combination of metal oxides; in some embodiments, the mineral solvent may include: silicon dioxide (SiO) 2 ) Alumina (Al) 2 O 3 ) Calcium oxide (CaO) 2 ) Magnesium oxide (MgO), potassium oxide (K) 2 O) and zinc oxide (ZnO).
Wherein, the silicon dioxide, namely quartz, is the main component of the glass, and the silicon dioxide powder can generate vitreous after sintering, so that the formed glaze layer is glittering and translucent and has better luster; the silica is a main component of the glaze, and because the melting point of the silica is 1750 ℃ and is higher, the silica can improve the melting temperature and viscosity of the glaze and reduce the thermal expansion coefficient of the glaze; therefore, controlling the content of the silicon dioxide is important for forming a better glaze layer, and if the content of the silicon dioxide is too high, the melting temperature of the glaze is too high, so that the sintering operation is difficult to perform; in the present application, the mass part of silica in the glaze is 35 to 60 parts.
Generally, it is desirable to reduce the melting temperature and viscosity of the glaze to some extent, to facilitate firing of the glaze, and in addition, a lower coefficient of thermal expansion is not conducive to the thermal stabilization of the glaze, which reduces the mechanical properties of the glaze layer, so it is also desirable to increase the coefficient of thermal expansion of the glaze appropriately; the alumina has a fluxing effect on the glaze, can promote the breakage of Si-O bonds of the silicon dioxide, accelerates the melting of high-melting-point crystals of the silicon dioxide, promotes the generation of low-melting-point eutectic substances, and can reduce the melting temperature of the glaze along with the increase of the content of the alumina so as to improve the expansion coefficient of the glaze; however, when the content of alumina is low, alumina and silicon dioxide can be welded and combined to form a network intermediate of a glaze layer in the sintering process, so that the mechanical strength of the glaze layer is improved; therefore, it is also important to control the content of alumina, which is too high to reduce the mechanical strength of the glaze layer; in the present application, the mass part of alumina in the glaze is 5 to 12 parts.
In some preferred embodiments, the content of alumina may be set according to the mass fraction of silica, and when the mass fraction of silica is in the range of 35 to 40, the mass fraction of alumina may be set to be low, for example, 5 to 7 parts, when the mass fraction of silica is in the range of 40 to 50, the mass fraction of alumina may be set to be high, for example, 7 to 11.5 parts, and when the mass fraction of silica is in the range of 50 to 60, the mass fraction of alumina may be set to be high, for example, 11.5 to 12 parts.
More preferably, the silica is set in a range of 35 to 40 parts by mass and the alumina is set in a range of 5 to 7 parts by mass in order to make the melting temperature of the glaze proper and make the mechanical strength of the glaze layer good.
It will be understood, of course, that the above-described preferred embodiments are not limiting, and that the preferred embodiments are merely preferred for better performance, since the values provided herein will also meet the manufacturing requirements.
The calcium oxide is also a fluxing agent with strong activity in the glaze, and can also reduce the melting temperature and the viscosity of the glaze and improve the fluidity and the expansion coefficient of the glaze; in the application, the mass part of the calcium oxide in the glaze is 14 to 16 parts.
Magnesium oxide can improve the thermal stability of the glaze and prevent the formed glaze layer from smoking and yellowing to a certain extent, but magnesium oxide can promote the formation of the intermediate layer of the blank glaze and further reduce the expansion coefficient of the glaze, so proper amount needs to be added; in the application, the mass part of the magnesium oxide in the glaze is 6 to 8 parts.
The potassium oxide and the zinc oxide are used for adjusting the binding force between the glaze and the ceramic matrix, and the contents of the potassium oxide and the zinc oxide are not too high, so that the melting temperature of the glaze is increased; in the present application, the mass part of potassium oxide in the glaze is 0.5 to 1.5 parts, preferably, 0.5 to 1 part; the mass part of the zinc oxide in the glaze is 5-6 parts.
In some embodiments, the mineral solvent may also include zirconia; the melting temperature of the zirconia is high, the zirconia can improve the high-temperature viscosity of the glaze and expand the temperature range of viscosity change at the temperature of about 2900 ℃, and when a small amount of zirconia is added, the anti-cracking performance of the glaze layer can be improved; in addition, the zirconium oxide has great chemical inertia, so that the chemical stability and the acid and alkali resistance of the glaze layer can be improved, and the function of an opacifier can be realized; in the present application, the mass part of zirconia in the glaze is 2 to 8 parts.
In the present application, when the ceramic substrate 11 is a zirconia ceramic substrate, zirconia in the glaze can improve the binding force between the neodymium-doped color-changing glaze layer 12 and the ceramic substrate 11, and further prevent the neodymium-doped color-changing glaze layer 12 from cracking and peeling off.
In some embodiments, the glaze further comprises a dispersant and printing oil, and the glaze is suitable for printing the glaze on the surface of the ceramic assembly 11 by printing or silk-screening; in this embodiment, the total parts by mass of the mineral solvent and the neodymium color-changing agent contained in the glaze is 100, and the ranges of the parts by mass of the dispersant and the stamp-pad ink contained in the glaze are respectively:
1 to 3 parts of a dispersant;
10-30 parts of stamp-pad ink;
the dispersant and the stamp-pad ink in this embodiment are mainly used to adjust the physical state of the glaze so that the glaze is suitable for printing.
In some embodiments, the dispersant can be, for example, at least one of sodium tripolyphosphate or sodium carboxymethylcellulose.
The glaze layer formed by the glaze in the embodiment of the application is light purple under sunlight, is dark green under a fluorescent lamp, and is orange red under a high-pressure sodium lamp. The content of neodymium discoloring agent in the glaze can influence the depth of discolored color, and in addition, if a proper amount of pigment is added into the glaze, glaze layers with other colors can be obtained; specifically, the additive may be added as needed.
In some embodiments, the colorant can be, for example, iron oxide, cobalt oxide, nickel oxide, manganese oxide, chromium oxide, titanium oxide, lead oxide, copper oxide, and the like; the addition amount of the colorant can be adjusted according to the required color, and generally, the colorant has high content and stronger color.
The glaze of the present application is formed on the surface of a ceramic substrate 11 whose main components are alumina, zirconia, and zirconium nitride; the glaze layer formed by the discoloring glaze materials formed on the surface of the traditional pottery clay porcelain is not stable in color change, poor in surface hardness, not wear-resistant, easy to generate pinholes and the like, and is not very poor in binding force with the surface of the ceramic substrate 11 mainly comprising aluminum oxide, zirconium oxide and zirconium nitride, and the glaze layer is easy to fall off, so that the glaze layer is not suitable for forming a shell component of electronic equipment; the glaze material has stable color change, good wear resistance and difficult occurrence of pinholes, and has very good binding force with the surface of the ceramic matrix 11 which takes alumina, zirconia and zirconium nitride as main components, thereby the glaze layer is difficult to fall off.
In some embodiments, the neodymium-doped color change glaze layer 12 may have a thickness ranging from 0.01 mm to 0.5 mm; however, if the thickness is too small, the appearance of the glaze layer 12 is likely to be poor, and if the thickness is too large, the transparency of the glaze layer 12 and the bonding force between the glaze layer 12 and the ceramic body 11 are affected.
In some embodiments, a transparent glaze layer 13 may be further formed on a surface of the neodymium-doped color-changing glaze layer 12 away from the ceramic substrate 11, so as to protect the neodymium-doped color-changing glaze layer 12 and further improve the crystal transparency of the surface of the neodymium-doped color-changing glaze layer 12.
Referring to fig. 2, a method for manufacturing a housing assembly according to a second embodiment of the present application is provided, including:
s201, preparing a ceramic blank;
s202, sintering the ceramic blank to obtain a ceramic matrix, wherein the main component of the ceramic matrix is at least one of alumina, zirconia and zirconium nitride;
s203, providing a glaze and applying the glaze to the surface of the ceramic substrate, wherein the glaze comprises a neodymium discoloring agent;
and S204, sintering the glaze to form a neodymium-doped color-changing glaze layer, thereby obtaining the shell assembly.
In some embodiments, the step of preparing the ceramic green body may be: providing raw materials containing ceramic powder and a binder, and mixing and molding the raw materials to obtain the ceramic blank.
Wherein the ceramic powder is at least one of alumina powder, zirconia powder and zirconium nitride powder; the mass part range of the ceramic powder in the raw material is 70-99 parts, the mass part range of the binder in the raw material is 1-30 parts, and the total weight parts of the ceramic powder and the binder are 100 parts.
In some embodiments, the main component of the ceramic powder is zirconia with a tetragonal crystal structure, which can form a dense zirconia ceramic having 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 ceramic powder further comprises a colorant, a stabilizer, and the like.
Wherein, in some embodiments, the colorant can be iron oxide, cobalt oxide, nickel oxide, zinc oxide, manganese oxide, chromium oxide, silicon oxide, copper oxide, strontium oxide, gallium oxide, rare earth oxide, aluminum oxide, magnesium oxide, and calcium oxide or AB 2 O 4 At least one of the materials of (a); wherein, the chemical formula is AB 2 O 4 In the material (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 chemical formula is AB 2 O 4 The 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) 2 O 4 And so on.
In some embodiments, the stabilizer may be yttria or the like, wherein the stabilizer facilitates stability of the ceramic crystal such that the ceramic matrix is not prone to cracking during sintering and processing.
In some embodiments, the binder may be one or more of paraffin, polyethylene glycol, stearic acid, dioctyl phthalate, polyethylene, polypropylene, polymethyl methacrylate, polyoxymethylene.
In some embodiments, the ceramic body may be obtained by sintering the ceramic green body at a temperature of 1200 ℃ or higher, and the sintering time may be 0.5 hours to 10 hours, depending on parameters such as the thickness of the ceramic green body.
Wherein, the ceramic green body can be placed in a sintering furnace and sintered in a reducing or oxidizing or inert atmosphere.
Preferably, before sintering the ceramic blank, the ceramic blank can be placed in a glue discharging box for glue discharging or degreasing, the glue discharging or degreasing temperature is controlled below 400 ℃, the time is controlled within 0.5-4 hours, and after glue discharging or degreasing, the obtained ceramic blank has no problems of distortion, cracking, discoloration and the like after sintering.
In some embodiments, after sintering the ceramic green body, CNC machining, grinding and polishing are performed to obtain a ceramic substrate with a proper shape and size and a smooth surface.
In some embodiments, the step of providing a glaze comprises: providing a neodymium color-changing agent; providing a mineral solvent; mixing the neodymium discoloring agent and the mineral solvent to obtain the glaze; wherein, the total mass fraction of the mineral solvent and the neodymium discoloring agent contained in the glaze is 100, and the mass fraction range of the neodymium discoloring agent contained in the glaze is 1 to 20, the mass fraction of the neodymium discoloring agent cannot be too high, otherwise, the mechanical property of the neodymium-doped discoloring glaze layer 12 is reduced; the mass parts of the neodymium discoloring agent can be selected according to discoloring requirements, if more obvious discoloring effect is required, a higher part can be selected within the mass part range, and if light discoloring effect is required, a lower part can be selected within the mass part range.
In some embodiments, the neodymium color-changing agent is a neodymium oxide or a neodymium silicon compound.
In a preferred embodiment, the neodymium discoloring agent is neodymium silicate (Nd) 2 Si 2 O 7 ) (ii) a The neodymium variable colorant can be prepared by a high-temperature solid phase method, a liquid phase method and the like.
In the present application, the mineral solvent may be a combination of metal oxides; in some embodiments, the mineral solvent may include: silicon dioxide (SiO) 2 ) Alumina (Al) 2 O 3 ) Calcium oxide (CaO) 2 ) Magnesium oxide (MgO), potassium oxide (K) 2 O) and zinc oxide (ZnO).
Wherein, the silicon dioxide, namely quartz, is the main component of the glass, and the silicon dioxide powder can generate vitreous after sintering, so that the formed glaze layer is glittering and translucent and has better luster; the silica is a main component of the glaze, and because the melting point of the silica is 1750 ℃ and is higher, the silica can improve the melting temperature and viscosity of the glaze and reduce the thermal expansion coefficient of the glaze; therefore, controlling the content of the silicon dioxide is important for forming a better glaze layer, and if the content of the silicon dioxide is too high, the melting temperature of the glaze is too high, so that the sintering operation is difficult to perform; in the present application, the mass part of silica in the glaze is 35 to 60 parts.
Generally, it is desirable to reduce the melting temperature and viscosity of the glaze to some extent, to facilitate firing of the glaze, and in addition, a lower coefficient of thermal expansion is not conducive to the thermal stabilization of the glaze, which reduces the mechanical properties of the glaze layer, so it is also desirable to increase the coefficient of thermal expansion of the glaze appropriately; the alumina has a fluxing effect on the glaze, can promote the breakage of Si-O bonds of the silicon dioxide, accelerates the melting of high-melting-point crystals of the silicon dioxide, promotes the generation of low-melting-point eutectic substances, and can reduce the melting temperature of the glaze along with the increase of the content of the alumina so as to improve the expansion coefficient of the glaze; however, when the content of alumina is low, alumina and silicon dioxide can be welded and combined to form a network intermediate of a glaze layer in the sintering process, so that the mechanical strength of the glaze layer is improved; therefore, it is also important to control the content of alumina, which is too high to reduce the mechanical strength of the glaze layer; in the present application, the mass part of alumina in the glaze is 5 to 12 parts.
In some preferred embodiments, the content of alumina may be set according to the mass fraction of silica, and when the mass fraction of silica is in the range of 35 to 40, the mass fraction of alumina may be set to be low, for example, 5 to 7 parts, when the mass fraction of silica is in the range of 40 to 50, the mass fraction of alumina may be set to be high, for example, 7 to 11.5 parts, and when the mass fraction of silica is in the range of 50 to 60, the mass fraction of alumina may be set to be high, for example, 11.5 to 12 parts.
More preferably, the silica is set in a range of 35 to 40 parts by mass and the alumina is set in a range of 5 to 7 parts by mass in order to make the melting temperature of the glaze proper and make the mechanical strength of the glaze layer good.
The calcium oxide is also a fluxing agent with strong activity in the glaze, and can also reduce the melting temperature and the viscosity of the glaze and improve the fluidity and the expansion coefficient of the glaze; in the application, the mass part of the calcium oxide in the glaze is 14 to 16 parts.
Magnesium oxide can improve the thermal stability of the glaze and prevent the formed glaze layer from smoking and yellowing to a certain extent, but magnesium oxide can promote the formation of the intermediate layer of the blank glaze and further reduce the expansion coefficient of the glaze, so proper amount needs to be added; in the application, the mass part of the magnesium oxide in the glaze is 6 to 8 parts.
The potassium oxide and the zinc oxide are used for adjusting the binding force between the glaze and the ceramic matrix, and the content of the potassium oxide and the content of the zinc oxide are not too high, so that the melting temperature of the glaze is increased; in the present application, the mass part of potassium oxide in the glaze is 0.5 to 1.5 parts, preferably, 0.5 to 1 part; the mass portion of the zinc oxide in the glaze is 5 to 6 portions.
In some embodiments, the mineral solvent may further comprise zirconia; the melting temperature of the zirconia is high, the zirconia can improve the high-temperature viscosity of the glaze and expand the temperature range of viscosity change at about 2900 ℃, and when a small amount of zirconia is added, the anti-cracking performance of the glaze layer can be improved; in addition, the zirconium oxide has great chemical inertia, so that the chemical stability and the acid and alkali resistance of the glaze layer can be improved, and the function of an opacifier can be realized; in the present application, the mass part of zirconia in the glaze is 2 to 8 parts.
In this application, when ceramic base 11 is zirconia ceramic base, the zirconia in the frit can promote the cohesion of neodymium-doped glaze layer 12 that discolours and ceramic base 11, further prevents the chap and the peeling-off of neodymium-doped glaze layer 12 that discolours.
In some embodiments, the glaze further comprises a dispersant and printing oil, and the glaze is suitable for printing the glaze on the surface of the ceramic assembly 11 by printing or silk-screening; in this embodiment, the total parts by mass of the mineral solvent and the neodymium color-changing agent contained in the glaze is 100, and the ranges of the parts by mass of the dispersant and the stamp-pad ink contained in the glaze are respectively:
1 to 3 parts of a dispersant;
10-30 parts of stamp-pad ink;
the dispersant and the stamp-pad ink in this embodiment are mainly used to adjust the physical state of the glaze so that the glaze is suitable for printing.
In some embodiments, the dispersant may be, for example, at least one of sodium tripolyphosphate or sodium carboxymethyl cellulose.
The content of neodymium discoloring agent in the glaze can influence the depth of discolored color, and in addition, if a proper amount of pigment is added into the glaze, glaze layers with other colors can be obtained; specifically, the additive may be added as needed.
In some embodiments, the colorant can be, for example, iron oxide, cobalt oxide, nickel oxide, manganese oxide, chromium oxide, titanium oxide, lead oxide, copper oxide, and the like; the addition amount of the coloring material can be adjusted according to the required color, and generally, the coloring material content is high, and the color is thicker.
In some embodiments, referring to fig. 3, the step of applying the glaze to the surface of the ceramic substrate comprises:
s2031, grinding the glaze to obtain glaze slurry;
s2032, preheating the ceramic matrix;
s2033, forming the glaze slip on the preheated ceramic substrate; and
s2034, drying the glaze slip.
Wherein, the step of grinding the glaze to obtain the glaze slurry can be as follows:
uniformly mixing the glaze formula, ball-milling the glaze in a planetary ball mill, and sieving to obtain glaze slurry; wherein, the ball milling proportion of the ball milling particles during ball milling is as follows: the method comprises the following steps: small-2: 4: 4, the rotating speed during ball milling is 400 revolutions per minute (r/min), the ball milling time is 1 hour to 1.5 hours, and the proportion of glaze, ball mill and water during ball milling is as follows: glaze material: ball milling: 1 in water: 1.8: and 0.8, sieving the glaze slurry by a 250-mesh sieve during sieving to obtain the glaze slurry.
In some embodiments, the ceramic matrix is preheated at a temperature of 150 ℃ to 200 ℃ for a time of 10 minutes to 20 minutes.
In some embodiments, the method of forming the glaze slip on the preheated ceramic substrate is spraying, printing or silk-screening.
In some embodiments, the glaze slip is dried at a temperature of 60 ℃ to 80 ℃ for a time of 50 minutes to 70 minutes.
In some embodiments, the glaze is sintered to form the neodymium-doped color-changing glaze layer at a temperature of 600 ℃ to 900 ℃ for a time of 100 minutes to 140 minutes.
In some embodiments, the neodymium-doped color-changing glaze layer may be formed on the entire appearance surface of the ceramic substrate; in other embodiments, the neodymium-doped color-changing glaze layer may also have a predetermined shape to be formed on a partial surface of the ceramic substrate, and the predetermined shape may be an abstract pattern, a real pattern, a painting, a character symbol, or the like; the neodymium-doped color-changing glaze layer can also be a pattern with a hollow part, namely a hollow pattern; and are not intended to be limiting herein; the sintering temperature and time of the glaze can be adjusted according to the actual process and the glaze pattern.
In some embodiments, after the applying the glaze to the surface of the ceramic substrate, the method further comprises the steps of: forming a transparent glaze on the surface of the glaze, which is far away from the ceramic substrate; sintering the glaze to form a neodymium-doped color-changing glaze layer, and sintering the transparent glaze to form a transparent glaze layer; the transparent glaze layer is used for protecting the neodymium-doped discoloring glaze layer and further improving the crystal transparency of the surface of the neodymium-doped discoloring glaze layer.
As shown in fig. 4, the third embodiment of the present application further provides an electronic device 300, where the electronic device 300 includes the housing assembly 100 according to the first embodiment of the present application, or includes the housing assembly prepared by the method for preparing the housing assembly as described above.
In some embodiments, the housing assembly 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 housing assembly, and particularly the color of the housing assembly, will be described with reference to specific embodiments.
Example 1
Preparing a zirconium oxide ceramic blank, and sintering the ceramic blank to obtain a ceramic matrix; providing a glaze, the glaze comprising: 2 parts of neodymium silicate, 52 parts of silicon dioxide, 12 parts of aluminum oxide, 15 parts of calcium oxide, 7 parts of magnesium oxide, 1 part of potassium oxide, 5 parts of zinc oxide and 6 parts of zirconium oxide; grinding the glaze to obtain glaze slip, preheating the ceramic matrix at 150 ℃ for 15 minutes, forming the glaze slip on the preheated ceramic matrix, and drying the glaze slip; and sintering the glaze together with the ceramic substrate at 700 ℃ for 100 minutes, and sintering the glaze to form a neodymium-doped color-changing glaze layer to obtain the ceramic chip.
The surface condition of the ceramic sheet in example 1 was observed, and the ceramic sheet in example 1 was subjected to a bonding force test, a surface hardness test, and a discoloration test.
Example 2
Preparing a zirconia ceramic blank, and sintering the ceramic blank to obtain a ceramic matrix; providing a glaze, the glaze comprising: 10 parts of neodymium silicate, 50 parts of silicon dioxide, 11.5 parts of aluminum oxide, 14 parts of calcium oxide, 6 parts of magnesium oxide, 0.5 part of potassium oxide, 5 parts of zinc oxide and 3 parts of zirconium oxide; grinding the glaze to obtain glaze slip, preheating the ceramic matrix at 150 ℃ for 15 minutes, forming the glaze slip on the preheated ceramic matrix, and drying the glaze slip; and sintering the glaze together with the ceramic substrate at 700 ℃ for 100 minutes, and sintering the glaze to form a neodymium-doped color-changing glaze layer to obtain the ceramic chip.
The surface condition of the ceramic sheet in example 2 was observed, and the ceramic sheet in example 2 was subjected to a bonding force test, a surface hardness test, and a discoloration test.
Example 3
Preparing a zirconium oxide ceramic blank, and sintering the ceramic blank to obtain a ceramic matrix; providing a glaze, the glaze comprising: 20 parts of neodymium silicate, 38 parts of silicon dioxide, 6 parts of aluminum oxide, 15 parts of calcium oxide, 7 parts of magnesium oxide, 1 part of potassium oxide, 5 parts of zinc oxide and 8 parts of zirconium oxide; grinding the glaze to obtain glaze slurry, preheating the ceramic matrix at 150 ℃ for 15 minutes, then forming the glaze slurry on the preheated ceramic matrix, and drying the glaze slurry; and sintering the glaze together with the ceramic substrate at 700 ℃ for 100 minutes, and sintering the glaze to form a neodymium-doped color-changing glaze layer to obtain the ceramic chip.
The surface condition of the ceramic sheet in example 3 was observed, and the ceramic sheet in example 3 was subjected to a bonding force test, a surface hardness test, and a discoloration test.
Example 4
Preparing a zirconia ceramic blank, and sintering the ceramic blank to obtain a ceramic matrix; providing a glaze, the glaze comprising: 10 parts of neodymium silicate, 50 parts of silicon dioxide, 11.5 parts of aluminum oxide, 14 parts of calcium oxide, 6 parts of magnesium oxide, 0.5 part of potassium oxide, 5 parts of zinc oxide, 2 parts of zirconium oxide and 1 part of chromium oxide serving as a pigment; grinding the glaze to obtain glaze slip, preheating the ceramic matrix at 150 ℃ for 15 minutes, forming the glaze slip on the preheated ceramic matrix, and drying the glaze slip; and sintering the glaze together with the ceramic substrate at 700 ℃ for 100 minutes, and sintering the glaze to form a neodymium-doped color-changing glaze layer to obtain the ceramic chip.
The surface condition of the ceramic sheet in example 4 was observed, and the ceramic sheet in example 4 was subjected to a bonding force test, a surface hardness test, and a discoloration test.
Comparative example 1
Preparing a zirconia ceramic blank, and sintering the ceramic blank to obtain a ceramic matrix; providing a glaze, the glaze being a commercially available glaze comprising: 18 parts of neodymium silicate, 45 parts of silicon dioxide, 9 parts of aluminum oxide, 13 parts of calcium oxide, 6 parts of magnesium oxide, 2 parts of potassium oxide and 7 parts of zinc oxide; grinding the glaze to obtain glaze slip, preheating the ceramic matrix at 150 ℃ for 10 minutes, forming the glaze slip on the preheated ceramic matrix, and drying the glaze slip; and sintering the glaze together with the ceramic matrix at 1250 ℃ for 100 minutes, and sintering the glaze to form a neodymium-doped color-changing glaze layer to obtain the ceramic chip.
The surface condition of the ceramic sheet in comparative example 1 was observed, and the ceramic sheet in comparative example 1 was subjected to a bonding force test, a surface hardness test, and a discoloration test.
Comparative example 2
Preparing a zirconia ceramic blank, and sintering the ceramic blank to obtain a ceramic matrix; providing a glaze, the glaze comprising: 24 parts of neodymium silicate, 38 parts of silicon dioxide, 6 parts of aluminum oxide, 14 parts of calcium oxide, 7 parts of magnesium oxide, 1 part of potassium oxide, 5 parts of zinc oxide and 5 parts of zirconium oxide; grinding the glaze to obtain glaze slurry, preheating the ceramic matrix at 150 ℃ for 15 minutes, then forming the glaze slurry on the preheated ceramic matrix, and drying the glaze slurry; and sintering the glaze together with the ceramic substrate at 700 ℃ for 100 minutes, and sintering the glaze to form a neodymium-doped color-changing glaze layer to obtain the ceramic chip.
The surface condition of the ceramic sheet in comparative example 2 was observed, and the ceramic sheet in comparative example 2 was subjected to a bonding force test, a surface hardness test, and a discoloration test.
The test results are shown in the following table:
TABLE 1
Figure BDA0002939252390000141
The method for testing the binding force comprises the following steps: refer to the national standard GB/T30707-2014 fine ceramic coating binding force test method-scratch method ".
The method for testing the surface hardness comprises the following steps: refer to the national standard 'testing method for the room temperature hardness of fine ceramics GB/T16534-2009'.
The test method of the discoloration test is as follows: and (3) placing the ceramic plates with the glaze layers under sunlight, a fluorescent lamp, a mercury lamp and a high-pressure sodium lamp in sequence respectively, and observing color change.
It should be noted that, for the convenience of testing and comparing the test results, the thicknesses of the ceramic substrates and the thicknesses of the glaze layers in the above-mentioned examples are the same.
Comparing the test results of examples 1 to 4 and comparative examples 1 to 2, it can be seen that: the color of the glaze layer formed becomes dark along with the increase of the content of the neodymium discoloring agent, the color of the glaze layer can be changed by adding the pigment, the traditional glaze is not suitable for the ceramic matrix of the application, the surface condition of the glaze layer is poor, the adhesion force with the ceramic matrix is poor, and in addition, the excessive addition of the neodymium discoloring agent also enables the surface condition of the glaze layer to be poor, and the adhesion force with the ceramic matrix is reduced.
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 (16)

1. A housing assembly, comprising:
a ceramic base body, the main component of which is at least one of alumina, zirconia and zirconium nitride; and
a neodymium-doped color-changing glaze layer formed on the surface of the ceramic substrate; the neodymium-doped color-changing glaze layer can change color under the irradiation of different light sources.
2. The housing assembly of claim 1, wherein the neodymium-doped color-changing glaze layer is formed by a glaze comprising a mineral solvent and a neodymium color-changing agent; wherein the total mass part of the mineral solvent and the neodymium discoloring agent contained in the glaze is 100, and the mass part range of the neodymium discoloring agent contained in the glaze is 1-20; the mineral solvent comprises silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, potassium oxide and zinc oxide; the mass parts of the mineral solvent contained in the glaze are respectively as follows:
silica, 35 to 60 parts;
5 to 12 parts of alumina;
14 to 16 parts of calcium oxide;
6-8 parts of magnesium oxide;
0.5 to 1.5 portions of potassium oxide;
5 to 6 portions of zinc oxide.
3. The housing assembly of claim 2, wherein the ceramic matrix comprises zirconia or zirconium nitride as a major component and the mineral solvent further comprises zirconia.
4. A housing assembly according to claim 3, wherein the mass fraction of zirconia in the mineral solvent is in the range of 2 to 8 parts.
5. The housing assembly of any of claims 2 to 4, wherein the mass fraction of silica in the mineral solvent ranges from 35 to 40 parts, the mass fraction of alumina in the mineral solvent ranges from 5 to 7 parts, and the mass fraction of potassium oxide in the mineral solvent ranges from 0.5 to 1 part.
6. The housing assembly of any one of claims 2 to 5, wherein the glaze further comprises a dispersant and a printing oil, wherein the dispersant and the printing oil are in the following ranges by weight:
1 to 3 parts of a dispersant;
10 to 30 portions of stamp-pad ink.
7. A housing assembly as claimed in any one of claims 2 to 6, wherein the neodymium discolouring agent is neodymium silicate (Nd) 2 Si 2 O 7 )。
8. The housing assembly of claim 1, wherein the ceramic substrate is formed from a raw material comprising a ceramic powder and a binder; wherein the ceramic powder is at least one of alumina powder, zirconia powder and zirconium nitride powder; the mass part range of the ceramic powder in the raw material is 70-99 parts, the mass part range of the binder in the raw material is 1-30 parts, and the total weight parts of the ceramic powder and the binder are 100 parts.
9. The housing assembly of claim 1, further comprising a transparent glaze layer formed on a side surface of the neodymium-doped color-changing glaze layer remote from the ceramic substrate.
10. A method of making a housing assembly, comprising:
preparing a ceramic blank;
sintering the ceramic blank to obtain a ceramic matrix, wherein the main component of the ceramic matrix is at least one of alumina, zirconia and zirconium nitride;
providing a glaze and applying the glaze to the surface of the ceramic substrate, wherein the glaze comprises a neodymium discolouring agent therein; and
and sintering the glaze to form a neodymium-doped color-changing glaze layer to obtain the shell assembly.
11. The method of making a housing assembly of claim 10, wherein the step of providing a frit comprises:
providing a neodymium color-changing agent;
providing a mineral solvent, wherein the mineral solvent comprises silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, potassium oxide and zinc oxide; and
mixing the neodymium discoloring agent and the mineral solvent to obtain the glaze;
wherein the total mass portion of the mineral solvent and the neodymium color-changing agent contained in the glaze is 100, and the mass portion range of the neodymium color-changing agent contained in the glaze is 1-20; the glaze comprises the following mineral solvents in parts by weight:
silica, 35 to 60 parts;
5 to 12 parts of alumina;
14 to 16 parts of calcium oxide;
6-8 parts of magnesium oxide;
0.5 to 1.5 portions of potassium oxide;
5 to 6 parts of zinc oxide.
12. The method of manufacturing a housing assembly according to claim 11, wherein the ceramic substrate has a main component of zirconia or zirconium nitride; the step of providing a mineral solvent further comprises providing zirconia; wherein the mass part range of the zirconia in the mineral solvent is 2 to 8 parts.
13. The method of making a housing assembly of claim 11, wherein the silica in the mineral solvent ranges from 35 to 40 parts by mass, the alumina in the mineral solvent ranges from 5 to 7 parts by mass, and the potassium oxide in the mineral solvent ranges from 0.5 to 1 part by mass.
14. The method of preparing a housing assembly of claim 10, wherein the step of applying the glaze to the surface of the ceramic substrate comprises:
grinding the glaze to obtain glaze slip;
preheating the ceramic substrate;
forming the glaze slip on the preheated ceramic substrate; and
drying the glaze slip;
wherein the preheating temperature of the ceramic matrix is 150 ℃ to 200 ℃, and the preheating time is 10 minutes to 20 minutes; the method for forming the glaze slip on the preheated ceramic substrate is spraying, printing or silk-screen printing; the temperature for drying the glaze slip is 60-80 ℃, and the drying time is 50-70 minutes.
15. The method for producing a housing component according to any one of claims 10 to 12, wherein the glaze is sintered to form the neodymium-doped discolored glaze layer at a temperature of 600 ℃ to 900 ℃ for a time of 100 minutes to 140 minutes.
16. An electronic device comprising the housing assembly according to any one of claims 1 to 9, or a housing assembly prepared by the method of preparing the housing assembly according to any one of claims 10 to 15.
CN202110172057.XA 2021-02-08 2021-02-08 Shell assembly, preparation method and electronic equipment Pending CN114907101A (en)

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Application publication date: 20220816