WO2021225190A1 - Composition céramique à faible constante k, à haute résistance, et couvercle arrière utilisant celle-ci pour dispositif mobile - Google Patents

Composition céramique à faible constante k, à haute résistance, et couvercle arrière utilisant celle-ci pour dispositif mobile Download PDF

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WO2021225190A1
WO2021225190A1 PCT/KR2020/005980 KR2020005980W WO2021225190A1 WO 2021225190 A1 WO2021225190 A1 WO 2021225190A1 KR 2020005980 W KR2020005980 W KR 2020005980W WO 2021225190 A1 WO2021225190 A1 WO 2021225190A1
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ceramic composition
zirconium silicate
zrsio
zirconia
zro
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PCT/KR2020/005980
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English (en)
Korean (ko)
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신용욱
박덕해
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엘지전자 주식회사
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Priority to KR1020227041972A priority Critical patent/KR20230005935A/ko
Priority to PCT/KR2020/005980 priority patent/WO2021225190A1/fr
Publication of WO2021225190A1 publication Critical patent/WO2021225190A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • 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
    • C04B35/481—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 silicon, e.g. zircon
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/20—Silicates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • 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
    • C04B35/16—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 silicates other than clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • 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
    • 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
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/03—Covers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • 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
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • 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
    • C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
    • C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • 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
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
    • C04B2235/3246—Stabilised zirconias, e.g. YSZ or cerium stabilised zirconia

Definitions

  • the present invention relates to a low-k, high-strength ceramic composition and a rear cover for mobile using the same, and more particularly, to zirconia (ZrO 2 ) by adding zirconium silicate (ZrSiO 4 ) to high strength characteristics and low dielectric It relates to a ceramic composition having characteristics and a rear cover for mobile using the same.
  • a high frequency or very high frequency is used to transmit and receive a large amount of data.
  • the frequency currently used is gradually changing from sub6 (4.5 GHz) to 28, 40 GHz, and it is expected that ultra-high frequencies above 100 GHz will be used in the future.
  • ion-strengthened glass is currently used as a rear cover of a mobile terminal, and ceramics are being considered as a material having higher strength than this.
  • the ceramic material has a very good strength compared to ion-strengthened glass, but has a problem in that a received signal may be lost or distorted because of a high dielectric constant.
  • the standard characteristics required to be usable as a rear cover of a mobile terminal can be defined as three-point flexural strength of 700 MPa to 800 MPa or more, dielectric constant 15, and signal loss of -4 dB or less.
  • the currently used zirconia (ZrO 2 ) ceramic material has excellent flexural strength of 1000 MPa or more, but has a dielectric constant of 28 to 32, and a signal loss of about -9 to 10 dB. Therefore, since the conventional zirconia (ZrO 2 ) ceramic material has a high dielectric constant and thus a signal loss is large, when used as a material for a rear cover of a mobile terminal or a component material for an electronic device exterior, a received signal may be lost or severely distorted. Therefore, there is a problem in that it is difficult to be used as a material for a rear cover for a mobile device or a component material for the exterior of an electronic device.
  • zirconia (ZrO 2) in order to reduce the high dielectric constant of the ceramic material zirconia (ZrO 2) a mixture of silica (silica, SiO 2) in the ceramic material should also take advantage of the sintered composition.
  • Silica has a dielectric constant of about 3.9.
  • Table 1 below is zirconia (ZrO 2 ) and silica (SiO 2 ) Flexural strength, dielectric constant (permittivity) and signal loss according to the composition ratio (weight percent, wt%) of a mixture of silica (SiO 2 ) shows the measurement results.
  • the dielectric constant decreases, so that the dielectric properties are improved, and thus the magnitude of the signal loss is reduced.
  • the flexural strength decreases accordingly.
  • the mixing ratio of silica is 16% or more, the flexural strength decreases to 550 MPa or less. That is, since the flexural strength is too low, there is a problem in that it is difficult to be used as a material for a rear cover of a mobile terminal or a component material for an exterior of an electronic device.
  • ZrO 2 zirconia
  • SiO 2 silica
  • An object of the present invention is to provide a ceramic composition having high strength characteristics and low dielectric properties by adding zirconium silicate (ZrSiO 4 ) to zirconia (ZrO 2 ) and a rear cover using the same in order to solve the above problems.
  • zirconium silicate ZrSiO 4
  • zirconia ZrO 2
  • the low dielectric high strength ceramic composition according to an embodiment of the present invention for achieving the above object includes stabilized zirconia and zirconium silicate (ZrSiO 4 ), and the stabilized zirconia is included in 20 to 60 weight percent (weight %), Zirconium silicate (ZrSiO 4 ) may be included in 40 to 80 weight percent (weight %).
  • flexural strength may be 700 MPa to 1000 MPa.
  • the dielectric constant may be 10 to 15.
  • the stabilized zirconia may contain 2 to 5 mole percent (mol%) of a stabilizer.
  • the stabilizer may be yttria (Yttria, Y 2 O 3 ).
  • zirconium silicate (ZrSiO 4 ) is zirconia (ZrO 2 ) and silica (SiO 2 ) Co-precipitation or It can be synthesized using a solid-reaction method.
  • zirconium silicate (ZrSiO 4 ) may have an average particle size of 0.5 ⁇ m to 1 ⁇ m.
  • the rear cover for mobile according to an embodiment of the present invention for achieving the above object may be formed by processing the ceramic composition.
  • the low-k, high-strength ceramic composition and the rear cover using the same according to an embodiment of the present invention have the effect of increasing strength and reducing signal loss by adding zirconium silicate (ZrSiO 4 ) to zirconia (ZrO 2 ).
  • ZrO 2 zirconia
  • SiO 2 silica
  • 2a to 2e are SEM images according to the mixing ratio of zirconia (ZrO 2 ) and zirconium silicate (ZrSiO 4 ) in the ceramic composition according to an embodiment of the present invention.
  • FIG. 3 is an XRD data plot according to the mixing ratio of zirconium silicate (ZrSiO 4 ) of FIGS. 2b to 2e.
  • FIGS. 4 is a graph showing the flexural strength according to the mixing ratio of zirconium silicate (ZrSiO 4 ) of FIGS. 2a to 2e.
  • FIG. 5 is a graph showing the dielectric constant and signal loss according to the zirconium silicate (ZrSiO 4 ) mixing ratio of FIGS. 2A to 2E .
  • module and “part” for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have a meaning or role distinct from each other by themselves. Accordingly, the terms “module” and “unit” may be used interchangeably.
  • the ceramic composition according to an embodiment of the present invention may include a single low-k compound in stabilized zirconia. Specifically, it may include a low-k single compound, zirconium silicate (ZrSiO 4 ).
  • Stabilized zirconia is prepared by adding a stabilizer to zirconia (ZrO 2 ).
  • Pure zirconia (ZrO 2 ) changes its crystal form from a tetragonal phase to a monoclinic phase at around 1100°C, and a rapid volume change causes cracks in the ceramics and self-destruction. none. Therefore, stabilized zirconia prepared by adding a stabilizer to prevent such a volume change may be used.
  • stabilized zirconia Since stabilized zirconia exhibits almost linear thermal expansion without a change in crystal form from room temperature to high temperature, a dense sintered body can be manufactured. In addition, stabilized zirconia has very high flexural strength.
  • Zirconium silicate (ZrSiO4) is a material with excellent thermal, mechanical, and chemical properties, and its sintered body is used in refractory materials, electromagnetic materials, and various chemical devices.
  • Zirconium silicate has a dielectric constant of 8.8 at a frequency of 1 MHz and a flexural strength of about 450 MPa.
  • stabilized zirconia is included in 20 to 60 weight percent (weight %), and zirconium silicate (ZrSiO 4 ) is included in 40 to 80 weight percent (weight %). have.
  • stabilized zirconia is included in 40 to 60 weight percent (weight %), and zirconium silicate (ZrSiO 4 ) may be included in 40 to 60 weight percent (weight %).
  • the content of the stabilized zirconia is less than 20 weight percent, the flexural strength of the ceramic composition of the present invention is too low, and there is a risk of easily breaking when used as a mobile rear cover.
  • the content of the stabilized zirconia exceeds 60 weight percent, the signal loss due to the ceramic composition increases, so that the radio wave reception ability of the mobile device is deteriorated when used as a mobile rear cover.
  • zirconium silicate (ZrSiO 4 ) when the content of zirconium silicate (ZrSiO 4 ) is less than 40 weight percent, the signal loss due to the ceramic composition increases, and when the content of zirconium silicate (ZrSiO 4 ) is 80 weight percent or more, the flexural strength of the ceramic composition is too low.
  • the dielectric constant of the ceramic composition may be 10 to 15.
  • the permittivity is 15 or more, the signal loss is excessively large, so that the radio wave reception ability of the mobile device is deteriorated when used as a rear cover for a mobile device.
  • the flexural strength of the ceramic composition may be 700 MPa to 1000 MPa.
  • the flexural strength of the ceramic composition may be 800 MPa to 1000 MPa.
  • the ceramic composition of the present invention is obtained by mixing zirconia (ZrO 2 ) and zirconium silicate (ZrSiO 4 ) in the same ratio as above and sintering, so that a low-k single compound such as zirconium silicate (ZrSiO 4 ) is zirconia (ZrO 2 ) It should be located in the grain interior and grain boundary of Accordingly, it is possible to implement a ceramic composition having low dielectric properties and high strength properties.
  • the stabilized zirconia may include yttria (Yttria, Y 2 O 3 ) as a stabilizer.
  • the stabilizer may be calcium oxide (CaO), magnesium oxide (MgO), or a rare earth oxide, but is not limited thereto.
  • the stabilized zirconia may contain from 2 to 5 mole percent (mol %) of a stabilizer. Preferably, the stabilized zirconia may contain 3 mole percent of a stabilizer.
  • zirconia has a monoclinic crystalline phase, thereby reducing flexural strength.
  • yttria Y 2 O 3
  • zirconia ZrO 2
  • a stabilized zirconia crystal in which all particles are tetragonal can be obtained by sintering under a stable tetragonal phase.
  • Such stabilized zirconia may have high strength properties of 1000 MPa or more.
  • the calcination temperature of the zirconia (ZrO 2 ) may be 1450° C. or less. The more a lot of stabilizers added to zirconia (ZrO 2) is the sintering temperature of the zirconia (ZrO 2) can be raised.
  • the ceramic composition according to an embodiment of the present invention may further include aluminum oxide (Al 2 O 3 ) in an amount of 0.5 to 2.5 weight percent based on the total weight of the ceramic composition.
  • Al 2 O 3 aluminum oxide
  • Aluminum oxide has a dielectric constant of about 9.4. Therefore, when the aluminum oxide is in the range of 0.5 to 2.5 weight percent, the dielectric constant of the ceramic composition may be reduced. In addition, due to the addition of aluminum oxide, it is possible to further improve the strength of the ceramic composition.
  • Yttria-stabilized zirconia undergoes a phase transition from a tetragonal phase to a monoclinic phase when exposed for a long time in a temperature range of room temperature (25° C.) to 400° C.
  • YSZ Yttria-stabilized zirconia
  • ZrO 2 zirconia
  • zirconia-alumina composite is much higher strength than zirconia (ZrO 2) can have
  • ZrO 2 Strength of zirconia (ZrO 2) is that it is inversely proportional to particle size, and the aluminum oxide added to zirconia (ZrO 2) inhibit the sintering when zirconia (ZrO 2) grain growth, increase the strength of the tetragonal zirconia (ZrO 2) It works.
  • the zirconium silicate (ZrSiO 4 ) may have an average particle size of 0.5 ⁇ m to 1 ⁇ m.
  • Zirconium silicate may improve the mechanical properties of the ceramic composition by increasing the crack propagation path as the average particle size is small.
  • zirconium silicate (ZrSiO 4 ) zirconia (ZrO 2 ) and silica (SiO 2 ) co-precipitation (Co-precipitation) or solid-phase reaction method (Solid-reaction) can be obtained by synthesis.
  • zirconia (ZrO 2 ) powder which is an oxide containing a zirconium (Zr) component
  • silica (SiO 2 ) powder which is an oxide containing a silicon (Si) component
  • the prepared raw material is put into a milling machine together with a ball and a solvent and mechanically mixed and pulverized to cause a solid-state reaction between the oxides. Thereafter, the pulverized product may be calcined to prepare a zirconium silicate (ZrSiO 4 ) powder.
  • ZrSiO 4 zirconium silicate
  • zirconium silicate may also be obtained by a sol-gel method, a thermal spray method, or a spray pyrolysis method, but is not limited thereto.
  • FIGS. 2a to 2e are SEM images according to the mixing ratio of zirconia (ZrO 2 ) and zirconium silicate (ZrSiO 4 ) in the ceramic composition according to an embodiment of the present invention
  • FIG. 3 is the zirconium of FIGS. 2b to 2e.
  • the XRD data plot according to the mixing ratio of silicate (ZrSiO 4 ) is shown.
  • the ceramic composition of the present invention includes zirconia (A) and zirconium silicate (B). It can be seen that the zirconium silicate (B) is evenly distributed in the grain boundaries and in the grains of the zirconia (A).
  • Zirconium silicate (ZrSiO 4 ) The melting point is about 2550 °C. Since the heat treatment temperature for forming the ceramic composition in the present invention is a temperature lower than the melting point of zirconium silicate (ZrSiO 4 ) by a certain temperature or more, zirconium silicate (ZrSiO 4 ) is zirconia (ZrO 2 ) and silica (SiO 2 ). Rather, it is mostly sintered by itself.
  • silica (SiO 2 ) is hardly present, and only zirconia (ZrO 2 ) and zirconium silicate (ZrSiO 4 ) It can be confirmed that have.
  • Tables 2 to 5 show XRD data according to the mixing ratio of zirconium silicate (ZrSiO 4 ) of FIGS. 2b to 2e.
  • the unit of content ratio is weight percent.
  • zirconium silicate (ZrSiO 4 ) All exist in a tetragonal phase.
  • zirconia is present in a tetragonal phase when the content ratio of zirconium silicate (ZrSiO 4 ) is less than 80 weight percent.
  • ZrSiO 4 zirconium silicate
  • Table 6 shows the results of measuring flexural strength, dielectric constant, and signal loss according to the composition ratio (weight percent, wt%) of the composition in which the stabilized zirconia is mixed with zirconium silicate (ZrSiO 4 ).
  • yttria-stabilized zirconia 3YSZ containing 3 mole percent of yttria (Y 2 O 3 ) was used.
  • the dielectric constant is about 9.8 and the signal loss is about -1.9, so it has excellent properties.
  • the flexural strength is about 650 MPa, and the strength characteristics are not suitable, so it cannot be used as a rear cover for mobile.
  • FIGS. 4 is a graph showing the flexural strength according to the mixing ratio of zirconium silicate (ZrSiO 4 ) of FIGS. 2a to 2e.
  • FIG. 5 is a graph showing the dielectric constant and signal loss according to the zirconium silicate (ZrSiO 4 ) mixing ratio of FIGS. 2A to 2E .
  • the ceramic composition according to an embodiment of the present invention may be processed to form a mobile rear cover, a side cover, or an exterior part.
  • These mobile rear covers, side covers, or exterior parts have sufficient flexural strength and can minimize signal loss in high-frequency or ultra-high-frequency environments.
  • the ceramic composition according to an embodiment of the present invention has excellent signal loss characteristics and thermal characteristics, it can be used in application fields such as ADAS substrate materials and various LTCC (Low Temperature Co-firing Ceramics) substrate materials. .

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
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Abstract

La présente invention concerne une composition céramique à faible k, à haute résistance, et un couvercle arrière utilisant celle-ci. Une composition céramique à faible k, à haute résistance selon un mode de réalisation de la présente invention comprend de la zircone stabilisée et du silicate de zirconium, la zircone stabilisée pouvant être contenue en une quantité de 20 à 60 % en poids, et le silicate de zirconium pouvant être contenu en une quantité de 40 à 80 % en poids. En conséquence, la composition peut avoir des propriétés de résistance élevée et de faibles propriétés diélectriques.
PCT/KR2020/005980 2020-05-07 2020-05-07 Composition céramique à faible constante k, à haute résistance, et couvercle arrière utilisant celle-ci pour dispositif mobile WO2021225190A1 (fr)

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KR1020227041972A KR20230005935A (ko) 2020-05-07 2020-05-07 저유전 고강도 세라믹 조성물 및 이를 이용한 모바일용 리어 커버
PCT/KR2020/005980 WO2021225190A1 (fr) 2020-05-07 2020-05-07 Composition céramique à faible constante k, à haute résistance, et couvercle arrière utilisant celle-ci pour dispositif mobile

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060268528A1 (en) * 2004-07-02 2006-11-30 Apple Computer, Inc. Handheld computing device
KR20130093173A (ko) * 2010-12-22 2013-08-21 생-고뱅 생트레 드 레체르체 에 데투드 유로삐엔 색상이 있는 소결된 지르코니아를 함유하는 장식용 물품
KR20140112523A (ko) * 2011-12-23 2014-09-23 생-고뱅 생트레 드 레체르체 에 데투드 유로삐엔 통신 소자
KR20160018904A (ko) * 2014-08-07 2016-02-18 주식회사 페코텍 상이한 결정상을 포함하는 지르코니아-이트리아-실리카 소결체

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060268528A1 (en) * 2004-07-02 2006-11-30 Apple Computer, Inc. Handheld computing device
KR20130093173A (ko) * 2010-12-22 2013-08-21 생-고뱅 생트레 드 레체르체 에 데투드 유로삐엔 색상이 있는 소결된 지르코니아를 함유하는 장식용 물품
KR20140112523A (ko) * 2011-12-23 2014-09-23 생-고뱅 생트레 드 레체르체 에 데투드 유로삐엔 통신 소자
KR20160018904A (ko) * 2014-08-07 2016-02-18 주식회사 페코텍 상이한 결정상을 포함하는 지르코니아-이트리아-실리카 소결체

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SHI, Y. HUANG, X. YAN, D.: "Toughening of hot-pressed ZrSiO"4 ceramics by addition of Y-TZP", MATERIALS LETTERS, ELSEVIER, AMSTERDAM, NL, vol. 35, no. 3-4, 1 May 1998 (1998-05-01), AMSTERDAM, NL , pages 161 - 165, XP004336819, ISSN: 0167-577X, DOI: 10.1016/S0167-577X(97)00239-5 *

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