JP7496524B2 - 無機構造体及びその製造方法 - Google Patents
無機構造体及びその製造方法 Download PDFInfo
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- JP7496524B2 JP7496524B2 JP2022527645A JP2022527645A JP7496524B2 JP 7496524 B2 JP7496524 B2 JP 7496524B2 JP 2022527645 A JP2022527645 A JP 2022527645A JP 2022527645 A JP2022527645 A JP 2022527645A JP 7496524 B2 JP7496524 B2 JP 7496524B2
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- magnesium oxide
- inorganic structure
- silicon
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- magnesium
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- 238000004519 manufacturing process Methods 0.000 title claims description 21
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 223
- 239000002245 particle Substances 0.000 claims description 162
- 239000000395 magnesium oxide Substances 0.000 claims description 114
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 75
- 229910052710 silicon Inorganic materials 0.000 claims description 54
- 239000010703 silicon Substances 0.000 claims description 54
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 48
- 239000007864 aqueous solution Substances 0.000 claims description 48
- 229910052751 metal Inorganic materials 0.000 claims description 41
- 239000011777 magnesium Substances 0.000 claims description 38
- 239000002184 metal Substances 0.000 claims description 38
- 229910052749 magnesium Inorganic materials 0.000 claims description 34
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 32
- 150000001875 compounds Chemical class 0.000 claims description 31
- 239000000377 silicon dioxide Substances 0.000 claims description 31
- 235000012239 silicon dioxide Nutrition 0.000 claims description 26
- 229910052760 oxygen Inorganic materials 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000010419 fine particle Substances 0.000 claims description 17
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 claims description 13
- 229910052783 alkali metal Inorganic materials 0.000 claims description 10
- 150000001340 alkali metals Chemical class 0.000 claims description 10
- 229910052797 bismuth Inorganic materials 0.000 claims description 9
- 229910052796 boron Inorganic materials 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 229910052745 lead Inorganic materials 0.000 claims description 8
- 229910052720 vanadium Inorganic materials 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 229910052712 strontium Inorganic materials 0.000 claims description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 6
- 229910052814 silicon oxide Inorganic materials 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 41
- 239000011148 porous material Substances 0.000 description 26
- 239000000843 powder Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- MKPXGEVFQSIKGE-UHFFFAOYSA-N [Mg].[Si] Chemical compound [Mg].[Si] MKPXGEVFQSIKGE-UHFFFAOYSA-N 0.000 description 11
- 239000002131 composite material Substances 0.000 description 11
- 238000001878 scanning electron micrograph Methods 0.000 description 9
- 229910021485 fumed silica Inorganic materials 0.000 description 8
- 238000013507 mapping Methods 0.000 description 8
- 229910052725 zinc Inorganic materials 0.000 description 8
- 239000011701 zinc Substances 0.000 description 8
- 238000002441 X-ray diffraction Methods 0.000 description 7
- UEGPKNKPLBYCNK-UHFFFAOYSA-L magnesium acetate Chemical compound [Mg+2].CC([O-])=O.CC([O-])=O UEGPKNKPLBYCNK-UHFFFAOYSA-L 0.000 description 7
- 229940069446 magnesium acetate Drugs 0.000 description 7
- 235000011285 magnesium acetate Nutrition 0.000 description 7
- 239000011654 magnesium acetate Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000001000 micrograph Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 229910052788 barium Inorganic materials 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 239000011812 mixed powder Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 4
- 238000000724 energy-dispersive X-ray spectrum Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 3
- 150000001342 alkaline earth metals Chemical class 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 229910052752 metalloid Inorganic materials 0.000 description 3
- 150000002738 metalloids Chemical class 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229910002012 Aerosil® Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000011164 primary particle Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229940097364 magnesium acetate tetrahydrate Drugs 0.000 description 1
- 150000002681 magnesium compounds Chemical class 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- XKPKPGCRSHFTKM-UHFFFAOYSA-L magnesium;diacetate;tetrahydrate Chemical compound O.O.O.O.[Mg+2].CC([O-])=O.CC([O-])=O XKPKPGCRSHFTKM-UHFFFAOYSA-L 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910052699 polonium Inorganic materials 0.000 description 1
- HZEBHPIOVYHPMT-UHFFFAOYSA-N polonium atom Chemical compound [Po] HZEBHPIOVYHPMT-UHFFFAOYSA-N 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 229910052705 radium Inorganic materials 0.000 description 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 239000005049 silicon tetrachloride Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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- 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
- C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/053—Fine ceramics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
- B28B3/025—Hot pressing, e.g. of ceramic materials
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/628—Coating the powders or the macroscopic reinforcing agents
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
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- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5454—Particle size related information expressed by the size of the particles or aggregates thereof nanometer sized, i.e. below 100 nm
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- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
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Description
本実施形態の無機構造体1は、図1に示すように、複数の酸化マグネシウム粒子2を含んでいる。そして、隣接する酸化マグネシウム粒子2が結合部3を介して互いに結合することにより、酸化マグネシウム粒子2が集合してなる無機構造体1を形成している。
次に、無機構造体1,1Aの製造方法について説明する。無機構造体は、複数の酸化マグネシウム粒子と、非晶質である複数の二酸化ケイ素粒子と、水溶液とを混合することにより、混合物を得る工程と、当該混合物を加圧及び加熱する工程と、により製造することができる。
次に、無機構造体1を備える部材について説明する。無機構造体1は、上述のように、厚みの大きな板状とすることができ、さらに緻密であるため安定性にも優れている。また、無機構造体1は、機械的強度が高く、一般的なセラミックス部材と同様に切断することができると共に、表面加工することもできる。そのため、無機構造体1は、建築部材として好適に用いることができる。建築部材としては特に限定されないが、例えば、外壁材(サイディング)、屋根材などを挙げることができる。また、建築部材としては、道路用材料、外溝用材料も挙げることができる。
まず、マグネシア粉末(MgO、宇部マテリアルズ株式会社製)と、非晶質であるシリカ粉末(フュームドシリカ、日本アエロジル株式会社製AEROSIL)とを準備した。次いで、表1に示す割合で、マグネシア粉末とシリカ粉末とを、メノウ乳鉢とメノウ乳棒を用い、アセトンを加えて混合することにより、各例の混合粉末を得た。なお、実施例1の混合粉末において、マグネシア粉末(MgO)とシリカ粉末(SiO2)の体積比率(vol%)は、62:38(MgO:SiO2)であった。
(結晶構造解析)
粉末X線回折(XRD)装置を用いて、試験サンプル1を粉砕した粉末のXRDパターンを測定した。図4では、ICSDに登録されたマグネシアのXRDパターン及び実施例1の試験サンプル1のXRDパターンを示す。
実施例1で作製した円柱状の試験サンプル1を割断した断面を、走査型電子顕微鏡(SEM)を用いて観察した。なお、試験サンプル1の観察面には、金のスパッタリングを施した。図5(a)では、試験サンプル1を300倍に拡大したSEM像を示す。また、参考までに、図5(b)では、300倍に拡大したマグネシア粉末のSEM像を示す。
まず、円柱状である実施例1の試験サンプル1の断面に、クロスセクションポリッシャー加工(CP加工)を施した。次に、走査型電子顕微鏡(SEM)を用い、試験サンプル1の断面について、50000倍の倍率で反射電子像を観察した。試験サンプル1の断面の3か所(位置1~3)を観察することにより得られた反射電子像を、図9(a),図9(b),図9(c)に示す。観察した反射電子像において、白色部22がマグネシア、灰色部23がケイ素含有化合物、黒色部25が気孔である。
実施例1の試験サンプル1、実施例2の試験サンプル2、実施例3の試験サンプル3の熱伝導率を、JIS R1611に準拠して測定した。各試験サンプルの熱伝導率を表2に示す。表2に示すように、本例の試験サンプル1,2,3は2.0W/m・K以上の高い熱伝導率を示し、実施例3の試験サンプル3は5.5W/m・Kと特に高い熱伝導率を示した。そのため、表1及び表2より、マグネシアの割合を高めることにより、無機構造体の熱伝導率を高められることが分かる。
2 酸化マグネシウム粒子
3 結合部
4 微粒子
11 酸化マグネシウム粒子
12 二酸化ケイ素粒子
13 ケイ素以外の金属元素を含む水溶液
Claims (7)
- 複数の酸化マグネシウム粒子と、
前記酸化マグネシウム粒子の表面を覆い、前記酸化マグネシウム粒子の間を結合する結合部と、
を備え、
前記結合部は、ケイ素とケイ素以外の金属元素と酸素とを含む非晶質化合物を含有し、かつ、アルカリ金属、B、V、Te、P、Bi、Pb及びZnを含まず、
前記結合部は、平均粒子径が100nm以下の微粒子を含み、
前記微粒子がケイ素と酸素と前記ケイ素以外の金属元素とを含む化合物及び二酸化ケイ素の少なくともいずれか一方を含み、
前記ケイ素以外の金属元素は、マグネシウムであり、
気孔率が20%以下である、無機構造体。 - 前記結合部は、Ca、Sr及びBaを含まない、請求項1に記載の無機構造体。
- 前記酸化マグネシウム粒子の体積割合が前記結合部の体積割合よりも大きい、請求項1又は2に記載の無機構造体。
- 前記酸化マグネシウム粒子は結晶質である、請求項1から3のいずれか一項に記載の無機構造体。
- 熱伝導率が2W/m・K以上である、請求項1から4のいずれか一項に記載の無機構造体。
- 厚みが500μm以上である、請求項1から5のいずれか一項に記載の無機構造体。
- 複数の酸化マグネシウム粒子と、非晶質である複数の二酸化ケイ素粒子と、ケイ素以外の金属元素を含む水溶液とを混合することにより、混合物を得る工程と、
前記混合物を、圧力が10~600MPaであり、かつ、温度が50~300℃である条件下で加圧及び加熱する工程と、
を有し、
前記ケイ素以外の金属元素は、マグネシウムである、無機構造体の製造方法。
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