WO2004108802A1 - Coque de telephone cellulaire et son procede de fabrication - Google Patents

Coque de telephone cellulaire et son procede de fabrication Download PDF

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Publication number
WO2004108802A1
WO2004108802A1 PCT/KR2004/000983 KR2004000983W WO2004108802A1 WO 2004108802 A1 WO2004108802 A1 WO 2004108802A1 KR 2004000983 W KR2004000983 W KR 2004000983W WO 2004108802 A1 WO2004108802 A1 WO 2004108802A1
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WO
WIPO (PCT)
Prior art keywords
cellular phone
coating layer
boron carbide
phone case
base material
Prior art date
Application number
PCT/KR2004/000983
Other languages
English (en)
Inventor
Jong-Hee Kim
Myung-Jin Park
Original Assignee
Semtech Corporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Semtech Corporated filed Critical Semtech Corporated
Publication of WO2004108802A1 publication Critical patent/WO2004108802A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/06—Coating with compositions not containing macromolecular substances
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0086—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single discontinuous metallic layer on an electrically insulating supporting structure, e.g. metal grid, perforated metal foil, film, aggregated flakes, sintering
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C11/00—Receptacles for purposes not provided for in groups A45C1/00-A45C9/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
    • C08L55/02—ABS [Acrylonitrile-Butadiene-Styrene] polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C11/00—Receptacles for purposes not provided for in groups A45C1/00-A45C9/00
    • A45C2011/002—Receptacles for purposes not provided for in groups A45C1/00-A45C9/00 for portable handheld communication devices, e.g. mobile phone, pager, beeper, PDA, smart phone
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2355/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2323/00 - C08J2353/00
    • C08J2355/02—Acrylonitrile-Butadiene-Styrene [ABS] polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates

Definitions

  • the present invention relates to a method of manufacturing a cellular phone case of which a surface is coated with boron carbide, and more particularly, to a scratch- . resistant cellular phone case coated with boron carbide, wherein the boron carbide is coated using a sputtering method on a glossy or flat surface thereof formed by spraying powder of metal such as aluminum (Al) onto a surface of a base material of a mixture of PC and ABS resins, thereby improving scratch resistance and prolonging the life of the cellular phone case due to the high hardness of the boron carbide thin film and a semipermanent adhesion property of the boron carbide thin film to the base material, and a method of manufacturing the same.
  • metal such as aluminum (Al)
  • a cellar phone case is molded by pouring a predetermined amount of a mixed slurry of PC (polycarbonate) resin and ABS (acrylonitrile-butadiene-styrene hybrid polymer or alkyl benzene sulfate) resin into an injection mold and then dried on a drying stand. Thereafter, glossy or flat coatings are formed on inner and outer surfaces of the molded cellular phone case through a spraying process. The coated cellular phone case is dried, packaged and shipped.
  • PC polycarbonate
  • ABS acrylonitrile-butadiene-styrene hybrid polymer or alkyl benzene sulfate
  • silver, copper, aluminum or the like is applied by means of spraying to the inner surface of a cellular phone case with a thickness of several dozen to hundreds of ⁇ m. Electromagnetic waves of up to 1,600 MHz radiate from the interior of a cellular phone while in use.
  • the silver, copper, aluminum or the like spray-coated on the inner surface of the cellular phone case serves as a conductor for allowing the electromagnetic waves radiating from the interior thereof to flow to the outside so that the electromagnetic waves can be rapidly collected at a ground terminal mounted in the cellular phone, thereby functioning as a shield against electromagnetic waves.
  • the outer surface of the cellular phone case is generally spray-coated with aluminum or the like in a glossy or flat manner so as to adjust the durability, fanciness, color or the like.
  • the present applicant proposed the application of a boron carbide (B 4 C) coating, which is used to improve scratch resistance and prolong the use life by imparting a high hardness property to a base material with poor scratch resistance such as various kinds of plastics, glasses, high strength resins and optical lenses, on the surfaces of conventional cellular phone cases by means of a sputtering method in which a reactive gas is added.
  • a boron carbide (B 4 C) coating which is used to improve scratch resistance and prolong the use life by imparting a high hardness property to a base material with poor scratch resistance such as various kinds of plastics, glasses, high strength resins and optical lenses, on the surfaces of conventional cellular phone cases by means of a sputtering method in which a reactive gas is added.
  • boron carbide generally has the following properties: superior thermal and mechanical properties due to its high melting point and hardness, chemical resistance against acids and bases, corrosion resistance and excellent absorbtance of neutrons for molten metal, relatively large thermoelectromotive force, low density and the like, it is suitable for coating the outer surfaces of cellular phone cases.
  • boron carbide has a disadvantage in that it is difficult to sinter the boron carbide due to its high degree of covalent bonding greater than 90% as in other carbides or nitrides. Therefore, there is a need for a method of producing a dense sintered material by solving the problem of difficult sintering in the prior art.
  • sputtering methods that are vacuum evaporation deposition methods using a sintered material of boron carbide as a target.
  • the sputtering methods are basically classified into RF sputtering and DC sputtering according to the kind of energy source used. They have been developed into magnetron sputtering mounted with a magnetron to improve ionization of the deposition material.
  • argon (Ar) gas or Ar gas with a reactive gas added thereto is used in a case where a deposition material is an oxide or nitride.
  • boron carbide expressed as B 4 C is a unique compound that stably exists in a binary system of boron (B) and carbon (C), carbon content has a wide range of solid solutions of 8 to 21 at%. Therefore, boron carbide is expressed as various formulas in addition to B C according to the carbon content.
  • the cause of degradation of the hardness in a range where carbon exists over the solid solution limit (B/C ⁇ 4) is the presence of free carbon.
  • Fig. 2 is a graph showing the cause of transition of a crystalline structure according to carbon content in boron carbide.
  • Zone II is a region where carbon content deceased from 17.7 at% to 13.5 at% and the lattice constant of the crystal lattice of the boron carbide did not vary according to changes in the carbon content.
  • Zone III is a region where the carbon content was below 13.5 at% and the lattice constant along the c-axis of a lattice point of boron carbide decreased and a lattice constant a h along the a-axis increased peculiarly according to decreases in the carbon content.
  • Fig. 1 is a graph showing variation of hardness value according to a stoichiometric composition ratio of B/C.
  • Fig. 2 is a graph showing variation of a lattice constant according to carbon content in a crystal structure of boron carbide.
  • Fig. 3 is an enlarged sectional view showing a structure in which a glossy or flat spray-coating layer and a boron carbide coating layer are deposited on a surface of a cellular phone case in accordance with the present invention.
  • Fig. 4 is a sectional view of a sputtering apparatus for forming the boron carbide coating layer on the surface of the cellular phone case in accordance with the present invention.
  • Fig. 5 is a graph showing results of scratch tests according to an introduction ratio of methane gas.
  • Fig. 6 is a diagrammatic view of a pencil hardness (ASTM D3363) tester for measuring the hardness of the boron carbide coating layer.
  • Base material 2 Spray-coating layer 3: Boron carbide coating layer 10: Sputtering apparatus 11 : DC or RF power source 12: Boron carbide target 13: Argon gas inlet
  • Methane gas inlet 15 Plasma 16: Substrate holder 17: Vacuum pump 18 : Deposition sample
  • An object of the present invention is to provide a wear-resistant cellular phone case coated with boron carbide, wherein a boron carbide coating layer is formed by means of a sputtering method adding methane as a reactive gas on a surface of a base material (glossy or flat substrate obtained through spray coating on a mixed PC and ABS resin) of the cellular phone case, thereby improving durability due to high scratch resistance and a semipermanent adhesion property of the boron carbide coating layer.
  • the object of the present invention is achieved by a method of manufacturing a cellular phone case, comprising the steps of forming a base material composed of a mixture of PC and ABS resins; applying a spray-coating layer to a surface of the base material; and depositing a boron carbide coating layer by means of a sputtering method on the surface of the base material with the spray-coating layer applied thereto.
  • the step of depositing the boron carbide coating layer comprises the steps of placing a boron carbide target within a sputtering apparatus; maintaining the interior of the sputtering apparatus in a vacuum state; introducing argon gas and a reactive gas into the sputtering apparatus; placing the base material with the spray-coating layer applied thereto within the sputtering apparatus; cleaning the base material with an RF bias; and depositing the boron carbide coating layer by means of the sputtering method on the surface of the base material with the spray-coating layer applied thereto, wherein the reactive gas is methane gas, and the methane gas is introduced into the sputtering apparatus in a range of 0.4 to 1.6% by volume.
  • the inner temperature of the sputtering apparatus upon deposition of the boron carbide coating layer is not grater than 80 ° C .
  • the spray-coating layer is formed by applying a material containing an aluminum (Al) component to the surface of the base material.
  • a cellular phone case comprising a base material composed of a mixture of PC and ABS resins; a spray-coating layer applied to a surface of the base material; and a boron carbide coating layer formed on the spray-coating layer.
  • the spray-coating layer contains an aluminum (Al) component.
  • the boron carbide coating layer is deposited by means of a sputtering method using methane gas as a reactive gas.
  • the boron carbide coating layer has a thickness of 0.02 to 0.1 ⁇ m.
  • the methane gas is used in a range of 0.4 to 1.6% by volume.
  • the present invention provides a thin film coating technique using a sputtering method in which methane (CH 4 ) gas is added as a reactive gas. Since the coating of the present invention has superior hardness and surface lubricity to those of the existing ceramic coating, it is applicable to various kinds of touch screens, bio fingerprint sensor devices, optical lenses and various kinds of protection coatings through the improvement of scratch resistance and durability of a cellular phone case.
  • Fig. 4 is a sectional view of a sputtering apparatus for forming a boron carbide coating layer on a surface of a cellular phone case in accordance with the present invention.
  • a method of manufacturing a cellular phone case will be described in detail below with reference to constitutional elements of a sputtering apparatus 10.
  • a boron carbide coating layer 3 is deposited by means of a sputtering method that is one of the physical vacuum deposition (PND) methods suitable for deposition of a base material 1 of the cellular phone case having a planar shape rather than a complex shape since the method has properties such as deposition at low temperature (deposition at room temperature), a coating process without discharge of pollutants, coating on a base material having a simple shape, deposition only in a region of plasma 15, a planar surface configuration, generation of various composition phases including an amorphous phase, and adaptation to a thin coating not greater than the order of ⁇ .
  • the cellular phone case of the present invention is prepared through a step of spray-coating a glossy or flat coating layer 2 on a surface of the base material 1 molded by a manufacturing apparatus.
  • the base material 1 of the cellular phone case is molded by means of injection molding by pouring a slurry obtained through proper combination of PC and ABS resins into a mold for the cellular phone case and is then dried.
  • an inner surface of the base material 1 is spray-coated with a conductive material such as aluminum (Al), silver or copper with a predetermined thickness (several dozen ⁇ m so as to shield electromagnetic waves.
  • a conductive material such as aluminum (Al), silver or copper with a predetermined thickness (several dozen ⁇ m so as to shield electromagnetic waves.
  • An outer surface of the base material 1 is spray-coated in a glossy or flat manner with metal powder containing aluminum so as to provide functions of decoration and a protection film against external environments.
  • the boron carbide coating layer 3 is deposited on the surface of the base material 1 or the spray-coating layer 2 of the cellular phone case, in order to improve the durability of the cellular phone case due to scratch resistance even through the cellular phone case is exposed to external environments by complementing a disadvantage in which a portion or corner portion of the cellular phone case exposed to the outside is partially worn and thus the spray-coating layer 2 is peeled off.
  • a boron carbide target 12 that is a sputtering material for improving scratch resistance and adhesiveness of the cellular phone case is placed within the sputtering apparatus 10, and the interior of the sputtering apparatus is maintained in a vacuum state.
  • the boron carbide coating layer 3 is deposited by controlling deposition time in a range of 1 hour or less at a process pressure of 1 to lOmtorr without heating the substrate.
  • a substrate holder 16 of the sputtering apparatus 10 is maintained under ultra high vacuum (10 "7 torr or higher) using a vacuum pump 17, argon gas is introduced at a flow rate of 5 to 80sccm through an argon gas inlet 13 into the sputtering apparatus 10, methane gas as a reactive gas is introduced in a range of 0.4 to 1.6% by volume through a methane gas inlet 14 thereinto, and DC power 11 of 0.5 to 5.5W/cm 2 is then applied. Then, the base material 1 with the spray-coating layer 2 applied thereto is placed within the apparatus 10 under these conditions, and the surface of the base material 1 is cleaned using an RF bias 19.
  • the interior of the sputtering apparatus 10 is in a state where there exists the plasma 15 under an argon gas atmosphere or a hydrocarbon atmosphere having methane (CH 4 ) gas as a reactive gas added thereto.
  • Fig. 5 shows the results of scratch tests in which cellular phone cases coated with a boron carbide coating layer having a thickness of 0.1 ⁇ m at a deposition temperature for cellular phone cases according to the present invention, i.e. room temperature, while controlling the introduction ratio of methane gas were tested using test instruments of Fig. 6. Generally, it shows that if a critical load was 3 ON or greater, superior scratch resistance was obtained. From the test results shown in Fig.
  • the critical load is 30N or greater and thus superior scratch resistance is obtained. More particularly, it can be seen that at the introduction ratio of methane gas of about 0.8% by volume, the critical load is about 40N and thus scratch resistance is maximized (this means that even though the coating is subjected to a scratch force of 40N, the coating withstands the force without any damage thereto).
  • the influence of deposition temperature on the deposition of a general boron carbide coating layer rather than the coating layer of the cellular phone case according to the present invention will be discussed with reference to Fig. 5.
  • the critical load is maximized at the introduction ratio of methane gas of about 0.8% by volume. Moreover, it can be seen that if the introduction ratio of methane gas further increases to 1.2% by volume at a deposition temperature below 100 ° C, the critical load decreases. On the contrary, it can be seen that at a deposition temperature of 200 °C, the critical load continuously increases along with the introduction ratio of methane gas so that the critical load can reach 32N at 1.6% by volume, thereby obtaining superior scratch resistance.
  • boron carbide atoms of the target 12 are vacuum deposited on the glossy or flat coated surface under the plasma 15 that is a group of cations and electrons charged due to electrical discharge of the introduced gases, thereby forming the scratch-resistant protection coating layer.
  • the glossy or flat spray-coating layer 2 and the boron carbide coating layer 3 are formed on the surface of the base material 1 of the cellular phone case.
  • the cellular phone case with the spray-coating layer and the boron carbide coating layer and its section are shown in Fig. 3.
  • the boron carbide coating layer 3 deposited on the base material 1 by means of the sputtering method be formed to have a thickness of 0,02 to 0.1 ⁇ m. Accordingly, the coating layer can be semi-permanently used while keeping high hardness without peeling thereof. The reason will be described in detail below based on the test results for the cellular phone case, according to the present invention.
  • the inner temperature of the sputtering apparatus 10 be maintained not greater than 80 °C , more preferably at room temperature without raising the temperature of the base material 1. The reason is because the inner temperature of the sputtering apparatus 10 cannot be raised in view of the property of the base material 1. Therefore, to improve the quality of a coating layer and enhance adhesiveness at an interface, methane gas is added as a reactive gas so that carbon particles can be absorbed between aluminum particles of the spray-coating layer 2 to enhance the adhesive property at the interface. Since a crystalline phase is formed as temperature increases, the surface friction coefficient becomes better when deposition is performed at room temperature at which an amorphous phase is formed. To further enhance the adhesiveness in addition thereto, the reactive gas is controllably mixed.
  • the substrate holder 16 is rotated and carbon particles relatively smaller than boron (B) particles are uniformly distributed in the coating layer by means of addition of the reactive gas and control of supplied power.
  • the boron carbide coating layer 3 having strong cohesion to the base material 1 of the cellular phone case even at low (room) temperature.
  • the deposition rate of the boron carbide for forming the scratch-resistant boron carbide coating layer 3 is increased so that a coating layer with higher crystallinity can be produced more rapidly.
  • the introduction of methane gas as the reactive gas is employed upon control of a chemical composition of boron carbide to improve strength, durability, cohesion and the like according to the glossy or flat spray-coating layer 2.
  • methane gas as the reactive gas is employed upon control of a chemical composition of boron carbide to improve strength, durability, cohesion and the like according to the glossy or flat spray-coating layer 2.
  • the target 12 of B 4 C is used, there are many cases where the composition of deposited boron carbide does not have the same crystalline phase of B 4 C as the target but has an amorphous phase (B 8 C, B 12 C, B 25 C, etc.) according to the kind of a substrate material used.
  • the boron carbide coating layers were deposited on glossy spayed-coated surfaces of the base materials of the cellular phone cases under the conditions of Table 2. Then, variations in pencil hardness, corrosion resistance, color and the like according to the thicknesses of the coating layers were evaluated.
  • the samples 18 were subjected to scratch forces by pushing respective pencils from a 6B pencil with the lowest hardness to an 8H pencil with the highest hardness thereon at an angle of about 45 degrees with a predetermined load of 500g using a pencil hardness tester as shown in Fig. 6. Then, the degree of scratch was measured. According to the degree of scratch, the mechanical properties of the boron carbide coating layers 3 were evaluated qualitatively.
  • Table 3 compares various surface properties according to the thicknesses of the boron carbide coating layers on the spray-coated surfaces of the cellular phone cases. It shows results of a comparison of Comparative example 1 (article on the market), which was a spray-coated mixed PC and ABS resin, with the boron carbide coating layers 3 having different thicknesses formed by depositing boron carbide for 2, 4 and 10 minutes on a glossy spray-coated mixed PC and ABS resin in view of pencil hardness, transparency, color, corrosiveness and the like.
  • the pencil hardness it is generally determined that if a product surface is scratched with a B pencil, it has low hardness, whereas if it is scratched with an H pencil, it has a certain degree of hardness.
  • Comparative example 1 was scratched with an H pencil
  • Example 1 was scratched with a 4H pencil
  • Examples 2 and 3 were scratched with 5H and 2H pencils, respectively. Therefore, it can be seen that the deposition of the boron carbide coating layers 3 considerably improve the hardness over the existing article on the market, and more particularly, the deposition of boron carbide in a thickness of about 60nm maximizes hardness.
  • both the cellular phone cases of Comparative example 1 in which glossy metal powder was spray-coated and Example 1 in which the boron carbide coating layer 3 was deposited for about 2 minutes represented silver color.
  • the cellular phone case of Example 2 in which the boron carbide coating layer 3 was deposited for about 4 minutes represented dark silver color. That is, Example 2 maintained silver color of Example 1 to a certain extent.
  • the cellular phone case of Example 3 in which the boron carbide coating layer 3 was deposited for about 10 minutes to obtain a coating thickness of about lOOnm represented a brown tone including light brown. Therefore, it can be seen that Example 3 could not maintain the color of the cellular phone case prior to the deposition but was changed.
  • the surface of the sample 18 of Comparative example 1 was corroded within 1 minute after immersion thereof in a corrosive solution so that aluminum pieces were peeled off over the entire surface.
  • any of the coating conditions exhibits superior pencil hardness or adhesiveness, it can be applicable in consideration of only scratch resistance of a cellular phone case.
  • the boron carbide coating layer 3 have a thickness between 20nm and lOOnm. Particularly, it can be seen that the deposition of the boron carbide coating layer 3 controllably deposited to have a coating thickness of about 60nm can most effectively improve surface properties while maintaining the configuration of an existing product.
  • the boron carbide coating of the present invention obtained through the manufacturing process using the sputtering method with the added reactive gas has a wider range of deposition conditions than diamond or cubic born nitride known for high hardness, and has easy formulation of chemical compositions and superior wear resistance, surface lubricity and thermal stability. Therefore, the boron carbide coating of the present invention can be widely used as a super-hard coating for use in molds, cutting tools, magnetic heads, hard disks, and the like.

Abstract

La présente invention concerne un procédé de fabrication d'une coque de téléphone cellulaire et, plus précisément, une coque de téléphone cellulaire et son procédé de fabrication. Ce procédé consiste à déposer par vaporisation une couche de revêtement à base de carbure de bore (B4C) possédant des propriétés mécaniques supérieures (résistance à l'usure, pouvoir lubrifiant, etc.), sur une surface brillante ou plane enduite par pulvérisation d'un matériau de base de la coque de téléphone cellulaire, ce qui permet de protéger la surface de la coque du téléphone cellulaire contre les rayures et d'augmenter ainsi sa durabilité. A cette fin, une couche de revêtement à base de carbure de bore, à coefficient de frottement et à conductivité thermique très bas et de très haute dureté, est déposée par vaporisation. Durant cette étape, du méthane gazeux (CH4) est utilisé comme gaz réactif pour améliorer la cristallinité et le pouvoir adhésif de la couche de revêtement à base de carbure de bore déposée sur la surface brillante ou plane enduite par pulvérisation du matériau de base de la coque de téléphone cellulaire.
PCT/KR2004/000983 2003-06-11 2004-04-29 Coque de telephone cellulaire et son procede de fabrication WO2004108802A1 (fr)

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Application Number Priority Date Filing Date Title
KR10-2003-0037426 2003-06-11
KR10-2003-0037426A KR100529590B1 (ko) 2003-06-11 2003-06-11 핸드폰 케이스 및 그 제조방법

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WO2004108802A1 true WO2004108802A1 (fr) 2004-12-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114481030A (zh) * 2022-01-26 2022-05-13 苏州闻道电子科技有限公司 一种固体中子转换层及其制备方法和应用

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Publication number Priority date Publication date Assignee Title
US5980602A (en) * 1994-01-19 1999-11-09 Alyn Corporation Metal matrix composite
JP2000349874A (ja) * 1999-06-09 2000-12-15 Yasuo Daidoji 携帯電話機等機器本体の塗装構造
KR20020006317A (ko) * 2000-07-12 2002-01-19 마상만 전자파 차단용 휴대폰 케이스의 조성물 및 그 제조방법
US20020072335A1 (en) * 2000-11-16 2002-06-13 Nec Corporation Cellular phone housing
JP2003012945A (ja) * 2001-03-28 2003-01-15 Ube Ind Ltd 導電性樹脂組成物及びその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5980602A (en) * 1994-01-19 1999-11-09 Alyn Corporation Metal matrix composite
JP2000349874A (ja) * 1999-06-09 2000-12-15 Yasuo Daidoji 携帯電話機等機器本体の塗装構造
KR20020006317A (ko) * 2000-07-12 2002-01-19 마상만 전자파 차단용 휴대폰 케이스의 조성물 및 그 제조방법
US20020072335A1 (en) * 2000-11-16 2002-06-13 Nec Corporation Cellular phone housing
JP2003012945A (ja) * 2001-03-28 2003-01-15 Ube Ind Ltd 導電性樹脂組成物及びその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114481030A (zh) * 2022-01-26 2022-05-13 苏州闻道电子科技有限公司 一种固体中子转换层及其制备方法和应用

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KR100529590B1 (ko) 2005-11-21
KR20040106641A (ko) 2004-12-18

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