JP7390501B2 - 絶縁体およびスパークプラグ - Google Patents
絶縁体およびスパークプラグ Download PDFInfo
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- JP7390501B2 JP7390501B2 JP2022574406A JP2022574406A JP7390501B2 JP 7390501 B2 JP7390501 B2 JP 7390501B2 JP 2022574406 A JP2022574406 A JP 2022574406A JP 2022574406 A JP2022574406 A JP 2022574406A JP 7390501 B2 JP7390501 B2 JP 7390501B2
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- 239000012212 insulator Substances 0.000 title claims description 118
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 92
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 58
- 239000011777 magnesium Substances 0.000 claims description 36
- 239000011575 calcium Substances 0.000 claims description 35
- 150000002910 rare earth metals Chemical class 0.000 claims description 35
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 230000014509 gene expression Effects 0.000 claims description 12
- 229910052788 barium Inorganic materials 0.000 claims description 10
- 229910052749 magnesium Inorganic materials 0.000 claims description 10
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 229910052746 lanthanum Inorganic materials 0.000 claims description 5
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical group [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 4
- 239000000843 powder Substances 0.000 description 104
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 67
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 49
- 150000001875 compounds Chemical class 0.000 description 31
- 239000000395 magnesium oxide Substances 0.000 description 26
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 26
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 26
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 25
- 239000002994 raw material Substances 0.000 description 25
- 239000000292 calcium oxide Substances 0.000 description 24
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 24
- 229910052681 coesite Inorganic materials 0.000 description 24
- 229910052906 cristobalite Inorganic materials 0.000 description 24
- 239000000377 silicon dioxide Substances 0.000 description 24
- 235000012239 silicon dioxide Nutrition 0.000 description 24
- 229910052682 stishovite Inorganic materials 0.000 description 24
- 229910052905 tridymite Inorganic materials 0.000 description 24
- 238000010304 firing Methods 0.000 description 19
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 16
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 description 16
- 238000002156 mixing Methods 0.000 description 14
- 230000015556 catabolic process Effects 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 12
- 239000002245 particle Substances 0.000 description 12
- 230000007423 decrease Effects 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 238000005245 sintering Methods 0.000 description 11
- 239000011521 glass Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 229910052593 corundum Inorganic materials 0.000 description 8
- 239000002002 slurry Substances 0.000 description 8
- 239000002904 solvent Substances 0.000 description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 7
- 229910019142 PO4 Inorganic materials 0.000 description 6
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 6
- 150000001805 chlorine compounds Chemical class 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 150000004679 hydroxides Chemical class 0.000 description 6
- 238000009413 insulation Methods 0.000 description 6
- 239000007769 metal material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 150000002823 nitrates Chemical class 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- 235000021317 phosphate Nutrition 0.000 description 6
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 6
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 239000011162 core material Substances 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium oxide Inorganic materials [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 description 5
- FIXNOXLJNSSSLJ-UHFFFAOYSA-N ytterbium(III) oxide Inorganic materials O=[Yb]O[Yb]=O FIXNOXLJNSSSLJ-UHFFFAOYSA-N 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052747 lanthanoid Inorganic materials 0.000 description 2
- 150000002602 lanthanoids Chemical class 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000001694 spray drying Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229920000084 Gum arabic Polymers 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910020797 La-Si Inorganic materials 0.000 description 1
- 229910017414 LaAl Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052773 Promethium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 241000978776 Senegalia senegal Species 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 235000010489 acacia gum Nutrition 0.000 description 1
- 239000000205 acacia gum Substances 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- OHSVLFRHMCKCQY-UHFFFAOYSA-N lutetium atom Chemical compound [Lu] OHSVLFRHMCKCQY-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- VQMWBBYLQSCNPO-UHFFFAOYSA-N promethium atom Chemical compound [Pm] VQMWBBYLQSCNPO-UHFFFAOYSA-N 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/38—Selection of materials for insulation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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
- C04B35/10—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 aluminium oxide
- C04B35/111—Fine ceramics
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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
- C04B35/10—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 aluminium oxide
- C04B35/111—Fine ceramics
- C04B35/117—Composites
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- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3215—Barium oxides or oxide-forming salts thereof
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- 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
- C04B2235/3227—Lanthanum oxide or oxide-forming salts thereof
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- 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
- C04B2235/34—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
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6565—Cooling rate
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- C—CHEMISTRY; METALLURGY
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Spark Plugs (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
(1)15.5≦(Si成分の含有割合)≦55.1
(2)0.6≦(Mg成分の含有割合)≦7.4
(3)26.7≦(Ba成分の含有割合)≦68.5
(4)1.1≦(Ca成分の含有割合)≦32.4
(5)11.4≦(希土類成分の含有割合)≦46.5
(a)29.1≦(Ba成分の含有割合)≦52.5
(b)12.4≦(希土類成分の含有割合)≦41.5
(A)30.6≦(Ba成分の含有割合)≦35.3
(B)17.4≦(希土類成分の含有割合)≦29.7
先ず、スパークプラグ1の全体構成について、図1を参照しながら説明する。スパークプラグ1は、絶縁体50および主体金具30を備えている。
続いて、スパークプラグ1を構成する絶縁体50のより具体的な構成について説明する。絶縁体50は、アルミナ(Al2O3)を主成分とするアルミナ焼結体により形成されている。
(1)15.5≦(Si成分の含有割合)≦55.1
(2)0.6≦(Mg成分の含有割合)≦7.4
(3)26.7≦(Ba成分の含有割合)≦68.5
(4)1.1≦(Ca成分の含有割合)≦32.4
(5)11.4≦(希土類成分の含有割合)≦46.5
(a)29.1≦(RBaO)≦52.5
(b)12.4≦(RREE)≦41.5
上記の構成によれば、後述の実施例に示すように、高温下における絶縁体50の耐電圧性能をより向上させることができる。
(c)21.0≦(RSiO2)≦43.6
(d)1.7≦(RMgO)≦2.3
(e)1.1≦(RCaO)≦15.5
(A)30.6≦(RBaO)≦35.3
(B)17.4≦(RREE)≦29.7
上記の構成によれば、後述の実施例に示すように、高温下における絶縁体50の耐電圧性能をより一層向上させることができる。
(C)29.9≦(RSiO2)≦42.3
(D)1.9≦(RMgO)≦2.3
(E)1.1≦(RCaO)≦8.4
以下では、絶縁体50の製造方法について説明する。
以上のように、本実施形態にかかるスパークプラグ1は、筒状の絶縁体50を備えている。この絶縁体は、アルミナ(Al2O3)を主成分として含有するとともに、副成分をさらに含有する。副成分は、シリコン(Si)成分、マグネシウム(Mg)成分、バリウム(Ba)成分、カルシウム(Ca)成分、および希土類成分を含んでいる。これらの各成分を酸化物換算したときの副成分の総質量に対する含有割合(質量%)は、それぞれ以下の(1)から(5)の関係式を満たしている。
(1)15.5≦(Si成分の含有割合)≦55.1
(2)0.6≦(Mg成分の含有割合)≦7.4
(3)26.7≦(Ba成分の含有割合)≦68.5
(4)1.1≦(Ca成分の含有割合)≦32.4
(5)11.4≦(希土類成分の含有割合)≦46.5
以下、本発明の一実施例について説明する。なお、本発明は、以下の実施例に限定はされない。
先ず、高温耐電圧試験に使用するための絶縁体の試験片を作製した。アルミナ粉末と、SiO2粉末と、MgCO3粉末と、BaCO3粉末と、CaCO3粉末と、La(OH)3粉末とを所定の割合で混合して原料粉末とした。この原料粉末に、溶媒としての水、および親水性結合剤を添加して原料スラリーを調製した。
作製した各試験片70を切断して切断面を研磨して、研磨面を得た。この研磨面を、蛍光X線分析して、検出された各元素(Al、Si、Mg、Ba、Ca、希土類元素(すなわち、La、Y、Nd、またはYb))を酸化物換算したときの合計質量に対するAl成分の酸化物換算したときの質量の割合を算出した。5箇所において同様の測定を行い、得られた値の算術平均を算出し、Al成分の含有割合PAl2O3を求めた。同様にして、Si成分、Mg成分、Ba成分、Ca成分、および希土類成分をそれぞれ酸化物換算したときの含有割合PSiO2、PMgO、PBaO、PCaO、PLa2O3(またはPY2O3またはPNd2O3またはPYb2O3)をそれぞれ求めた。
(1)15.5≦(RSiO2)≦55.1
(2)0.6≦(RMgO)≦7.4
(3)26.7≦(RBaO)≦68.5
(4)1.1≦(RCaO)≦32.4
(5)11.4≦(RREE)≦46.5
各試験片70について、図2に示す耐電圧測定装置100を用いて、900℃における高温耐電圧試験を行った。耐電圧測定装置100は、主として、加熱ボックス120、電極123aおよび123b、アルミナ製碍筒124aおよび124b、ヒータ126、および高電圧発生装置(CDI電源)127などで構成される。
A:最良(絶縁破壊発生時の電圧値(kV/mm)が60以上)
B:より良好(絶縁破壊発生時の電圧値(kV/mm)が55以上60未満)
C:良好(絶縁破壊発生時の電圧値(kV/mm)が45以上55未満)
×:不良(絶縁破壊発生時の電圧値(kV/mm)が45未満)
(1)15.5≦(RSiO2)≦55.1
(2)0.6≦(RMgO)≦7.4
(3)26.7≦(RBaO)≦68.5
(4)1.1≦(RCaO)≦32.4
(5)11.4≦(RREE)≦46.5
(a)29.1≦(RBaO)≦52.5
(b)12.4≦(RREE)≦41.5
(A)30.6≦(RBaO)≦35.3
(B)17.4≦(RREE)≦29.7
11 :接地電極
20 :中心電極
30 :主体金具
50 :絶縁体
70 :絶縁体試験片
Claims (5)
- スパークプラグ用の筒状の絶縁体であって、
前記絶縁体は、アルミナを主成分として含有するとともに、副成分をさらに含有し、
前記副成分は、シリコン(Si)成分、マグネシウム(Mg)成分、バリウム(Ba)成分、カルシウム(Ca)成分、および希土類成分を含み、
これらの各成分を酸化物換算したときの前記副成分の総質量に対する含有割合(質量%)は、それぞれ下記(1)から(5)の関係式を満たしており、
(1)15.5≦(Si成分の含有割合)≦55.1
(2)0.6≦(Mg成分の含有割合)≦7.4
(3)26.7≦(Ba成分の含有割合)≦68.5
(4)1.1≦(Ca成分の含有割合)≦32.4
(5)11.4≦(希土類成分の含有割合)≦46.5
さらに、前記絶縁体の総質量に対する前記アルミナの含有割合(質量%)は、91.0質量%以上97.0質量%以下の範囲内である、絶縁体。 - 前記Ba成分および前記希土類成分を酸化物換算したときの前記副成分の総質量に対する含有割合(質量%)は、さらに、それぞれ下記(a)および(b)の関係式を満たしている、請求項1に記載の絶縁体。
(a)29.1≦(Ba成分の含有割合)≦52.5
(b)12.4≦(希土類成分の含有割合)≦41.5 - 前記Ba成分および前記希土類成分を酸化物換算したときの前記副成分の総質量に対する含有割合(質量%)は、さらに、それぞれ下記(A)および(B)の関係式を満たしている、請求項2に記載の絶縁体。
(A)30.6≦(Ba成分の含有割合)≦35.3
(B)17.4≦(希土類成分の含有割合)≦29.7 - 前記希土類成分は、ランタン(La)成分である、請求項1に記載の絶縁体。
- 請求項1から4の何れか1項に記載の絶縁体と、
筒状の形状を有し、前記絶縁体の少なくとも一部を内部に収容している主体金具と、
前記絶縁体の先端に配置されている中心電極と、
前記主体金具に接合され、前記中心電極との間でギャップを形成する接地電極と
を備えているスパークプラグ。
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