CN111454058B - Zirconia ceramic-based mobile phone backboard and preparation method thereof - Google Patents

Zirconia ceramic-based mobile phone backboard and preparation method thereof Download PDF

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CN111454058B
CN111454058B CN202010532465.7A CN202010532465A CN111454058B CN 111454058 B CN111454058 B CN 111454058B CN 202010532465 A CN202010532465 A CN 202010532465A CN 111454058 B CN111454058 B CN 111454058B
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ceramic
alumina
frame
zirconia
buffer structure
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CN111454058A (en
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张天舒
孔令兵
王生
刘银
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Nanjing Sanotes Material Technology Co ltd
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Nanjing Sanotes Material Technology Co ltd
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    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped 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
    • C04B35/49—Shaped 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 containing also titanium oxides or titanates
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    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5022—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with vitreous materials
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    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • C04B41/86—Glazes; Cold glazes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0279—Improving the user comfort or ergonomics
    • H04M1/0283—Improving the user comfort or ergonomics for providing a decorative aspect, e.g. customization of casings, exchangeable faceplate
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    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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    • C04B2235/666—Applying a current during sintering, e.g. plasma sintering [SPS], electrical resistance heating or pulse electric current sintering [PECS]

Abstract

The invention discloses a mobile phone backboard based on zirconia ceramics, which at least comprises a frame made of metal or alloy, a ceramic unit made of zirconia-based ceramics and embedded or penetrated in the frame, and a buffer structure arranged between the frame and the ceramic unit. And frame subunits which are periodically or non-periodically arranged along the length direction and/or the width direction of the mobile phone backboard and used for accommodating the ceramic units are formed in the frame, so that the ceramics can be embedded or penetrated in the frame subunits to form the ceramic subunits which are periodically or non-periodically arranged along the length direction and/or the width direction of the mobile phone backboard. The ceramic subunits arranged in this way, or the frame subunits arranged in this way, or the ceramic subunits and the frame subunits form a preset pattern together.

Description

Zirconia ceramic-based mobile phone backboard and preparation method thereof
Technical Field
The invention relates to the technical field of ceramic materials, in particular to a mobile phone back plate based on zirconia ceramics and a preparation method thereof.
Background
The rapid development of the mobile phone manufacturing technology has promoted the progress of the manufacturing technology of related component parts, and structural parts such as mobile phone shells and the like have made remarkable progress. As one of the main parts of the external structural components of the mobile phone, the performance and quality of the mobile phone rear cover are receiving more and more attention, and the consumers also put forward specific and strict technical requirements. As a main supporting part of the mobile phone, the mobile phone rear cover must have sufficient strength and toughness, and simultaneously have good design factors, and is more convenient for production, manufacture and reuse. Therefore, the development of a rear cover of a mobile phone made of various novel materials and a preparation process thereof are needed.
The traditional metal has a shielding effect, so that the application of the metal mobile phone back plate is limited, and the application of the plastic in the field of large-size and ultra-thin mobile phones is limited due to the inherent low strength defect of the plastic. Therefore, the ceramic is increasingly popular with consumers as a raw material of the mobile phone back plate. The zirconia ceramics has excellent mechanical properties, such as high strength, high hardness, high toughness, oxidation resistance, corrosion resistance, good glossiness, high melting point, large resistance, high refractive index and the like, and meanwhile, the material formed by taking zirconia as a main matrix has the excellent characteristics of high structural strength, large hardness, low thermal expansion coefficient, stable chemical property and the like, and is widely applied to various structural members and appearance members. And the zirconia ceramics have no shielding effect on electromagnetic signals, so the zirconia ceramics are accepted and favored by more and more consumers. However, the ceramic material is complex to prepare, the same powder and forming process are adopted, different sintering processes have important influence on the comprehensive performance of the finally prepared ceramic product, in addition, the mechanical property discreteness of the ceramic material is large, when zirconia is used alone, due to the hard and brittle mechanical property, other materials are required to be supplemented to increase the toughness and the forming characteristic of the mobile phone rear cover, and the factors cause great risk in the application of the zirconia ceramic in the field of the mobile phone rear cover.
Chinese patent CN201711366286.5 discloses a method for manufacturing a zirconia ceramic mobile phone rear cover by using a tape casting process, which comprises the steps of ball-milling a zirconia ceramic powder raw material for manufacturing the zirconia ceramic mobile phone rear cover, mixing and stirring the raw material and an additive together, then carrying out secondary wet grinding to obtain a premixed slurry, mixing the premixed slurry and an organic plasticizer solution to prepare a mixed slurry with a certain viscosity, carrying out tertiary grinding on the mixed slurry to obtain a tape casting slurry, and carrying out vacuum defoaming treatment on the tape casting slurry; then the casting slurry flows into a zirconia ceramic mobile phone rear cover die from a container, and is coated on the zirconia ceramic mobile phone rear cover die in a scraping way according to the thickness of the zirconia ceramic mobile phone rear cover by a scraper, and the zirconia ceramic mobile phone rear cover die is peeled from the upper part after being dried and cured to form a rear cover green body, and then the green body is subjected to punching and laminating processing according to the size and the shape of the zirconia ceramic mobile phone rear cover to be made into a blank; sintering to obtain a zirconia ceramic mobile phone rear cover blank; and processing to obtain a zirconia ceramic mobile phone rear cover finished product. The zirconia ceramic mobile phone rear cover prepared by the method does not modify zirconia, and still has the problems of poor toughness and easy fracture of the mobile phone rear cover.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a mobile phone backboard based on zirconia ceramics, which at least comprises a frame made of metal or alloy, a ceramic unit made of zirconia-based ceramics and embedded or penetrated in the frame, and a buffer structure arranged between the frame and the ceramic unit.
According to a preferred embodiment, a frame sub-unit for accommodating the ceramic unit is formed in the frame and arranged periodically or non-periodically along the length direction and/or the width direction of the handset back plate, so that the ceramic can be embedded or penetrated into the frame sub-unit to form a ceramic sub-unit arranged periodically or non-periodically along the length direction and/or the width direction of the handset back plate. The ceramic subunits arranged in this way, or the frame subunits arranged in this way, or the ceramic subunits and the frame subunits form a preset pattern together.
According to a preferred embodiment, the ceramic element is made of a nano-alumina doped zirconia ceramic. Wherein the weight percentage of the alumina is not more than 1.0wt percent, and the buffer structure is made of a negative thermal expansion material Zr2WP2O12A composite ceramic prepared by compounding with zirconia and alumina, wherein, Zr2WP2O12Is 4 to 6 weight percent of oxygenThe weight percentage of the aluminum oxide is 0.5wt% to 1.0 wt%.
According to a preferred embodiment, the ceramic subunits form a concentration gradient with a gradually increasing alumina fraction in the direction from the center of the ceramic subunit to the contact surface of the ceramic subunit with the buffer structure, so that the alumina fraction of the ceramic subunits gradually increases to be the same as the alumina fraction in the buffer structure from the center of the ceramic subunit to the contact surface of the ceramic subunits with the buffer structure.
According to a preferred embodiment, the ceramic subunits have an average radial dimension not greater than 1mm and the frame has an average cross-sectional dimension not greater than 1 mm.
According to a preferred embodiment, the frame shelving units are formed with apertures allowing adjacent ceramic subunits or cushioning structures to be connected therethrough.
The invention also discloses a preparation method of the mobile phone backboard based on the zirconia ceramics, which at least comprises the following steps: providing a mold with a preset pattern, wherein the mold is provided with a mold body for accommodating zirconia powder, zirconia and alumina mixed powder and zirconia, alumina and Zr which respectively form a ceramic unit and a buffer structure2WP2O12A mold subunit of the mixed powder, which is arranged periodically or non-periodically along the length direction and/or width direction of the mold; filling powder for forming a ceramic unit and a buffer structure in the mould subunit, wherein the powder for forming the buffer structure is filled between the powder for forming the ceramic unit and the mould subunit; sintering at a preset temperature to enable the powder to form a ceramic unit and a buffer structure; and removing the mold, and embedding metal or alloy in the ceramic unit and the buffer structure to form a frame, wherein the frame, the ceramic unit and the buffer structure jointly form the mobile phone backboard.
According to a preferred embodiment, a concentration gradient in which the alumina fraction gradually increases in the direction from the center of the ceramic subunit to the contact surface thereof with the buffer structure is formed in the ceramic subunit by adjusting the content of zirconia and alumina in the mixed powder of zirconia and alumina used for forming the ceramic unit, which content is related to the position of the powder, so that the alumina fraction gradually increases to be the same as the alumina fraction in the buffer structure from the center of the ceramic subunit to the contact surface thereof with the buffer structure.
According to a preferred embodiment, the mould sub-units have holes therein allowing adjacent ceramic sub-units or cushioning structures to be connected therethrough.
According to a preferred embodiment, the ceramic unit is made of a nano-alumina-doped zirconia ceramic, wherein the weight percentage of alumina is not more than 1.0wt%, and the buffer structure is made of a negative thermal expansion material Zr2WP2O12A composite ceramic prepared by compounding with zirconia and alumina, wherein, Zr2WP2O12Is 4 to 6wt%, and the weight percentage of the alumina is 0.5 to 1.0 wt%.
The beneficial technical effects of the invention comprise one or more of the following:
the mobile phone back plate disclosed by the invention adopts a composite structure formed by the metal frame, the ceramic embedding body and the buffer structure, and compared with an all-metal back plate, the electromagnetic signal shielding effect of the metal back plate is obviously weakened. Compared with the mobile phone back plate made of full zirconia ceramics, the mobile phone back plate made of full zirconia ceramics has the advantages that the defects of hard and brittle mechanical properties are obviously improved, particularly, the internal stress among the ceramics can be obviously reduced through the combination of the ceramics, the negative thermal expansion material and the metal frame which are embedded into each other, and particularly, the internal stress is caused in the temperature change process caused by the heat generation of the mobile phone. And thirdly, the metal frame can improve the heat dissipation performance of the ceramic back plate to a great extent, and heat generated by using the mobile phone can be effectively dissipated to the surrounding environment. Fourthly, the mobile phone back plate can be designed according to the preset pattern in the manufacturing process, namely the appearance design is combined with the manufacturing of the back plate, the pattern is manufactured while the back plate is manufactured, and compared with the pattern which is adhered to the back plate after the back plate is manufactured, the mobile phone back plate has better visual effect and cannot damage the pattern due to abrasion in use.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of a mobile phone back plate of the present invention.
List of reference numerals
1: and (3) a frame 2: ceramic unit 3: buffer structure
Detailed Description
The following detailed description is made with reference to the accompanying drawings.
The invention provides a mobile phone backboard based on zirconia ceramics, as shown in figure 1, the mobile phone backboard at least comprises a frame 1 made of metal or alloy, a ceramic unit 2 made of zirconia-based ceramics embedded or penetrated in the frame, and a buffer structure 3 (only shown in one frame subunit) arranged between the frame and the ceramic unit.
Preferably, the frame 1 is made of a metal or an alloy having good ductility and thermal conductivity. For example, the frame may be made of magnesium, aluminum, copper, iron, or other alloys containing magnesium, aluminum, copper, or iron. By making the metal into a frame rather than a complete backplane face, the shielding effect of the metal against electromagnetic signals is diminished. Magnesium and aluminum, which are low in density, are more preferable choices in view of metal density and lightweight requirements of the cellular phone.
Preferably, the ceramic element 2 is composed of zirconia ceramic, and may also be composed of zirconia ceramic doped to improve toughness, such as alumina-stabilized zirconia ceramic, or yttria-stabilized zirconia ceramic. Preferably, the ceramic unit 2 is embedded or penetrated in the frame 1 to form a structure in which the ceramic unit 2 and the metal frame 1 are embedded into each other, and a buffer structure is further arranged between the ceramic unit 2 and the frame 1, so that the mechanical stress in the ceramic unit 2 can be relieved through the metal frame 1 and the buffer structure 3, the toughness of the ceramic backboard is further improved, and the hard and brittle mechanical defects of the ceramic backboard are improved. In addition, the metal frame 1 gives the mobile phone back plate good heat-conducting property. Preferably, the metal frame 1 penetrates the thickness of the handset back plate. Compared with a full-ceramic backboard with low thermal conductivity, one surface of the metal frame 1 can be in contact with or close to a heating element of the mobile phone, the other surface of the metal frame is in contact with the external environment, and the thermal conductivity of the metal frame 1 is far greater than that of a ceramic material, so that heat dissipated by the mobile phone element in the using process can be effectively dissipated to the external environment, and the mobile phone is prevented from being overheated.
According to a preferred embodiment, frame sub-units for accommodating the ceramic units are formed in the frame 1 and are periodically or non-periodically arranged along the length direction and/or the width direction of the mobile phone backboard, so that the ceramic can be embedded or penetrated into the frame sub-units to form ceramic sub-units which are periodically or non-periodically arranged along the length direction and/or the width direction of the mobile phone backboard. The ceramic subunits arranged in this way, or the frame subunits arranged in this way, or the ceramic subunits and the frame subunits form a preset pattern together.
Preferably, holes capable of accommodating ceramics, formed by staggering metal or alloy strips in the width direction and the length direction, are formed in the frame 1, namely, the frame subunits. The frame shelving units may be regularly shaped or irregularly shaped. The frame shelving units may be arranged periodically or non-periodically. The frame unit can be formed according to a predetermined pattern, so that the back panel of the mobile phone of the present invention can form the predetermined pattern through the frame, or form the predetermined pattern through the ceramic filled in the frame, or form the predetermined pattern through the combination of the ceramic and the frame. Under the effects of shielding prevention, heat dissipation, stress relief and toughening, the mobile phone back plate can form a decorative pattern which is different from a surface pattern which is attached or stuck on the back plate and easy to wear, is not easy to wear and cannot damage the pattern due to wear.
According to a preferred embodiment, the ceramic element 2 is made of a nano-alumina doped zirconia ceramic. Wherein the weight percentage of alumina is not more than 1.0wt%, and the buffer structure 3 is made of negative thermal expansion material Zr2WP2O12A composite ceramic prepared by compounding with zirconia and alumina, wherein, Zr2WP2O12Is 4 to 6wt%, and the weight percentage of the alumina is 0.5 to 1.0 wt%.
Preferably, the nano alumina is mixed with zirconia powder, and after high-temperature sintering, aluminum ions can be fully diffused into zirconia crystal lattices to form the aluminum ion doped zirconia ceramic material. After the alumina is doped, the compactness of the zirconia ceramic is improved, and the content of pores is obviously reduced. Due to the pinning effect of the nano alumina particles on the grain boundary of the zirconia material particles, the growth of zirconia matrix grains is effectively inhibited, and simultaneously, the sizes of various defects in a matrix are favorably reduced, so that the matrix material has a more uniform microstructure. The doped small amount of nano alumina is beneficial to improving the sintering density, the bending strength and the fracture toughness of the zirconia ceramic. The sintered compactness, the bending strength and the fracture toughness of the material are the best when the doping amount is 0.25 wt.%, and are respectively 99.6 percent, 1206MPa and 9.4 MPa. Because a small amount of aluminum ions are dissolved in the tetragonal zirconia in a solid solution mode, the lattice constant of the tetragonal zirconia is reduced, the ratio of the positive ions to the negative ions is increased, the stability of the tetragonal phase is reduced, the content of metastable tetragonal zirconia is increased, the phase change toughening effect of the material is enhanced, and finally the strength and the toughness of the material are improved to a certain extent. However, when the content of doped nano-alumina is too high, a large amount of aluminum ions are accumulated on the grain boundary of the matrix or deposited in the crystal grains, and the stability of the matrix is damaged, so that the mechanical properties of the material are reduced. Preferably, the weight percentage of the nano alumina is not more than 1.0 wt%.
Preferably, the buffer structure 3 contains a negative thermal expansion material Zr2WP2O12. By doping with negative thermal expansion material Zr2WP2O12The thermal expansion coefficient of the zirconia ceramic can be effectively adjusted, and the internal stress between the ceramic subunits can be further relieved. More advantageously, when the mobile phone backplate experiences a temperature increase during, for example, heating of the mobile phone components, the combination of the metal frame 1, the negative thermal expansion material-doped buffer structure 3 and the ceramic unit 2 can release or relieve the stress generated by the temperature increase when heated, and the macroscopic structure is stable. Through experiments, it is found that when 4wt% to 6wt% of Zr is doped in the buffer structure2WP2O12When the stress buffering structure 3 is matched with the frame 1 and the ceramic unit 2 to the maximum extent, the stress buffering performance is optimal. At this time, the buffer knot is formedThe thermal expansion coefficient of the composite ceramic is adjusted to 5.8 × 10-6/° C to 7.2 × 10-6Between/° c; the bending strength and the elastic modulus are significantly reduced compared to the undoped zirconia ceramic, the bending strength is about 50 to 70MPa, and the elastic modulus is about 2 to 4GPa, thereby leading to better cushioning performance and improving the toughness of the entire structure of the backplate.
According to a preferred embodiment, the ceramic subunits form a concentration gradient with a gradually increasing alumina fraction in the direction from the center of the ceramic subunit to the contact surface of the ceramic subunit with the buffer structure, so that the alumina fraction of the ceramic subunits gradually increases to be the same as the alumina fraction in the buffer structure from the center of the ceramic subunit to the contact surface of the ceramic subunits with the buffer structure. Through this arrangement, there is the gradient layer in terms of alumina content between pottery subunit and the buffer structure, and this gradient layer can regard as the buffering of another layer between pottery subunit and the buffer structure, can also strengthen the hookup compactness between pottery subunit and the buffer structure, prevents to appear splitting between pottery subunit and the buffer structure.
According to a preferred embodiment, the ceramic subunits have an average radial dimension not greater than 1mm and the frame has an average cross-sectional dimension not greater than 1 mm. Preferably, the smaller the geometric dimensions of the ceramic and frame sub-units, the better the stress relief and heat dissipation properties. Moreover, smaller geometries also enable finer appearance patterns. In the context of the present invention, the radial dimension of a ceramic subunit refers to the maximum of the dimension in the direction of its radial extension. The cross-sectional dimension of the frame is the largest dimension of the cross-section of the metal or alloy bars or rods constituting the frame.
According to a preferred embodiment, the frame shelving units are formed with apertures allowing adjacent ceramic subunits or cushioning structures to be connected therethrough. In this way, adjacent ceramic subunits or buffer structures can be coupled to each other.
Example 2
The embodiment discloses a preparation method of a mobile phone backboard based on zirconia ceramics, which at least comprises the following steps: providing a preset mapThe mold comprises a ceramic unit and a buffer structure formed by mixing zirconia powder, zirconia and alumina mixed powder, zirconia, alumina and Zr2WP2O12A mold subunit of the mixed powder, which is arranged periodically or non-periodically along the length direction and/or width direction of the mold; filling powder for forming a ceramic unit and a buffer structure in the mould subunit, wherein the powder for forming the buffer structure is filled between the powder for forming the ceramic unit and the mould subunit; sintering at a preset temperature to enable the powder to form a ceramic unit and a buffer structure; and removing the mold, and embedding metal or alloy in the ceramic unit and the buffer structure to form a frame, wherein the frame, the ceramic unit and the buffer structure jointly form the mobile phone backboard.
According to a preferred embodiment, a concentration gradient in which the alumina fraction gradually increases in the direction from the center of the ceramic subunit to the contact surface thereof with the buffer structure is formed in the ceramic subunit by adjusting the content of zirconia and alumina in the mixed powder of zirconia and alumina used for forming the ceramic unit, which content is related to the position of the powder, so that the alumina fraction gradually increases to be the same as the alumina fraction in the buffer structure from the center of the ceramic subunit to the contact surface thereof with the buffer structure.
According to a preferred embodiment, the mould sub-units have holes therein allowing adjacent ceramic sub-units or cushioning structures to be connected therethrough.
According to a preferred embodiment, the ceramic unit is made of a nano-alumina-doped zirconia ceramic, wherein the weight percentage of alumina is not more than 1.0wt%, and the buffer structure is made of a negative thermal expansion material Zr2WP2O12A composite ceramic prepared by compounding with zirconia and alumina, wherein, Zr2WP2O12Is 4 to 6wt%, and the weight percentage of the alumina is 0.5 to 1.0 wt%.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims (9)

1. The mobile phone back plate based on zirconia ceramics is characterized by at least comprising a frame made of metal or alloy, a ceramic unit made of zirconia-based ceramics and embedded or penetrated in the frame, and a buffer structure arranged between the frame and the ceramic unit;
a frame subunit which is periodically or non-periodically arranged along the length direction and/or the width direction of the mobile phone backboard and is used for accommodating the ceramic unit is formed in the frame, so that the ceramic can be embedded into or penetrated into the frame subunit to form the ceramic subunit which is periodically or non-periodically arranged along the length direction and/or the width direction of the mobile phone backboard, the ceramic subunits arranged in the way, or the frame subunit arranged in the way, or the ceramic subunits and the frame subunit form a preset pattern together;
the buffer structure is made of negative thermal expansion material Zr2WP2O12A composite ceramic prepared by compounding with zirconia and alumina, wherein, Zr2WP2O12Is 4 to 6wt%, and the weight percentage of the alumina is 0.5 to 1.0 wt%.
2. The handset backplate of claim 1, wherein the ceramic elements are comprised of nano alumina doped zirconia ceramic, wherein the weight percent of alumina is no greater than 1.0 wt%.
3. The handset backplate of claim 2, wherein the ceramic subunits form a concentration gradient with a gradually increasing alumina fraction in a direction from the center of the ceramic subunits to the interface with the buffer structure, such that the alumina fraction of the ceramic subunits increases gradually to the same fraction as the alumina fraction in the buffer structure from the center of the ceramic subunits to the interface with the buffer structure.
4. A handset backplate according to claim 3 in which the ceramic sub-units have an average radial dimension of no more than 1mm and the frame has an average cross-sectional dimension of no more than 1 mm.
5. The cellular phone backplate of claim 4, wherein the frame stand units are formed with holes allowing adjacent ceramic subunits or buffer structures to be connected therethrough.
6. A preparation method of a mobile phone backboard based on zirconia ceramics is characterized by at least comprising the following steps:
providing a mold with a preset pattern, wherein the mold is provided with a mold body for accommodating zirconia powder, zirconia and alumina mixed powder and zirconia, alumina and Zr which respectively form a ceramic unit and a buffer structure2WP2O12A mold subunit of the mixed powder, which is arranged periodically or non-periodically along the length direction and/or width direction of the mold;
filling powder for forming a ceramic unit and a buffer structure in the mould subunit, wherein the powder for forming the buffer structure is filled between the powder for forming the ceramic unit and the mould subunit;
sintering at a preset temperature to enable the powder to form a ceramic unit and a buffer structure;
removing the mold, and embedding metal or alloy in the ceramic unit and the buffer structure to form a frame, wherein the frame, the ceramic unit and the buffer structure jointly form the mobile phone backboard;
the buffer structure is made of negative thermal expansion material Zr2WP2O12A composite ceramic prepared by compounding with zirconia and alumina, wherein, Zr2WP2O12Is 4 to 6wt%, and the weight percentage of the alumina is 0.5 to 1.0 wt%.
7. The production method according to claim 6, wherein a concentration gradient in which the alumina fraction gradually increases in a direction from the center thereof to the surface thereof in contact with the buffer structure is formed in the ceramic subunit by adjusting the content of zirconia and alumina in the mixed powder of zirconia and alumina for forming the ceramic unit, which is filled in the mold, in relation to the position where the powder is located, so that the alumina fraction gradually increases from the center of the ceramic subunit to the surface thereof in contact with the buffer structure to be the same as the alumina fraction in the buffer structure.
8. The method of claim 7, wherein the mold sub-units have holes therein that allow adjacent ceramic sub-units or cushioning structures to be connected therethrough.
9. The method of claim 8, wherein the ceramic elements are comprised of nano alumina doped zirconia ceramic, wherein the weight percent of alumina is no greater than 1.0 wt%.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5165983A (en) * 1984-09-30 1992-11-24 Kabushiki Kaisha Toshiba Method for production of aluminum nitride ceramic plate
CN1881570A (en) * 2005-01-21 2006-12-20 福克斯电子公司 Integrated circuit package encapsulating a hermetically sealed device
CN103581375A (en) * 2012-07-27 2014-02-12 Lg电子株式会社 Mobile terminal
CN108717240A (en) * 2018-07-25 2018-10-30 惠州市华星光电技术有限公司 A kind of Rimless liquid crystal display die set and liquid crystal display
CN208112684U (en) * 2018-04-03 2018-11-16 Oppo广东移动通信有限公司 Housing unit and electronic device
CN109413244A (en) * 2018-12-03 2019-03-01 武汉华星光电半导体显示技术有限公司 Flexible OLED mobile phone module

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5165983A (en) * 1984-09-30 1992-11-24 Kabushiki Kaisha Toshiba Method for production of aluminum nitride ceramic plate
CN1881570A (en) * 2005-01-21 2006-12-20 福克斯电子公司 Integrated circuit package encapsulating a hermetically sealed device
CN103581375A (en) * 2012-07-27 2014-02-12 Lg电子株式会社 Mobile terminal
CN208112684U (en) * 2018-04-03 2018-11-16 Oppo广东移动通信有限公司 Housing unit and electronic device
CN108717240A (en) * 2018-07-25 2018-10-30 惠州市华星光电技术有限公司 A kind of Rimless liquid crystal display die set and liquid crystal display
CN109413244A (en) * 2018-12-03 2019-03-01 武汉华星光电半导体显示技术有限公司 Flexible OLED mobile phone module

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