WO2006018347A1 - Keramischer elektrischer widerstand - Google Patents
Keramischer elektrischer widerstand Download PDFInfo
- Publication number
- WO2006018347A1 WO2006018347A1 PCT/EP2005/053149 EP2005053149W WO2006018347A1 WO 2006018347 A1 WO2006018347 A1 WO 2006018347A1 EP 2005053149 W EP2005053149 W EP 2005053149W WO 2006018347 A1 WO2006018347 A1 WO 2006018347A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ceramic
- resistor according
- ceramic resistor
- filler
- organosilicon polymer
- Prior art date
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- 239000000919 ceramic Substances 0.000 title claims abstract description 92
- 239000000945 filler Substances 0.000 claims abstract description 24
- 238000000197 pyrolysis Methods 0.000 claims abstract description 12
- -1 polysiloxane Polymers 0.000 claims abstract description 9
- 230000007774 longterm Effects 0.000 claims abstract description 7
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 7
- 229910000323 aluminium silicate Inorganic materials 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 22
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 12
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 11
- 229910052863 mullite Inorganic materials 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 229920001558 organosilicon polymer Polymers 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 5
- 239000012798 spherical particle Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 238000010292 electrical insulation Methods 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229920000548 poly(silane) polymer Polymers 0.000 claims description 2
- 229920003257 polycarbosilane Polymers 0.000 claims description 2
- 238000001721 transfer moulding Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims 2
- 229910052581 Si3N4 Inorganic materials 0.000 claims 1
- 150000001639 boron compounds Chemical class 0.000 claims 1
- 230000001681 protective effect Effects 0.000 claims 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims 1
- 239000005995 Aluminium silicate Substances 0.000 abstract 1
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 abstract 1
- 235000012211 aluminium silicate Nutrition 0.000 abstract 1
- 229920000620 organic polymer Polymers 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 20
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 14
- 239000000377 silicon dioxide Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 235000012239 silicon dioxide Nutrition 0.000 description 9
- 238000000465 moulding Methods 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910021343 molybdenum disilicide Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- YOBOXHGSEJBUPB-MTOQALJVSA-N (z)-4-hydroxypent-3-en-2-one;zirconium Chemical compound [Zr].C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O YOBOXHGSEJBUPB-MTOQALJVSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- 229910052580 B4C Inorganic materials 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 229910016006 MoSi Inorganic materials 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 229920000734 polysilsesquioxane polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 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
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
- C04B35/571—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide obtained from Si-containing polymer precursors or organosilicon monomers
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- C04B35/6264—Mixing media, e.g. organic solvents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
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- H01C17/06506—Precursor compositions therefor, e.g. pastes, inks, glass frits
- H01C17/06513—Precursor compositions therefor, e.g. pastes, inks, glass frits characterised by the resistive component
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
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- H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
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- C04B2235/3427—Silicates other than clay, e.g. water glass
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- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
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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
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
-
- 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
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
-
- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/80—Phases present in the sintered or melt-cast ceramic products other than the main phase
-
- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
- F23Q2007/004—Manufacturing or assembling methods
Definitions
- the invention relates to a ceramic resistor and a method for its production and to a ceramic heater containing it after the
- ceramics are used as ceramic resistors, they often contain a high proportion of aluminum oxide in order to ensure a sufficiently high electrical resistance. However, this impairs the long-term stability of the ceramics at higher temperatures, as at temperatures above 1250 0 C a
- Ceramics based on hydridosiloxanes which may contain mullite, inter alia, are known from US Pat. No. 5,635,250. These ceramics also contain metallic powders which aid in the catalytic conversion of the hydridosiloxanes to the corresponding ceramic.
- the object of the present invention is to provide a ceramic resistor which shows a largely constant electrical resistance even in applications at higher temperatures.
- a ceramic electrical resistance is proposed, which can be produced by pyrolysis of an organosilicon polymer and at least one filler, wherein the ceramic resistor contains an aluminum silicate as a filler.
- the addition of an alumitium silicate instead of aluminum oxide to the ceramic increases their long-term stability, so that it exhibits a largely constant electrical resistance even in the long term under elevated temperatures. This is essentially due to the fact that in aluminum oxide-containing SiOC ceramics at high temperatures a
- the ceramic is another filler
- Mobybdändisilicid provided. This makes it possible to use the ceramic resistor as a resistance track, since the content of molybdenum disilicide, the electrical conductivity of the ceramic can be influenced.
- the total filler content of the ceramic resistor is advantageously 10 to 30 vol.%.
- the filler particles used have an average particle size d.sub.50 of less than 3 .mu.m, since in this case the resulting ceramic exhibits a particularly good sintering behavior.
- the ceramic resistor contains a
- FIG. 1 shows an exemplary embodiment of a Glühstiflkerze in longitudinal section, which contains the erf ⁇ ndungswashen ceramic contradiction.
- FIG. 1 shows a longitudinal section through an embodiment of an Glühstiflkerze containing the ceramic contraindication according to the invention.
- the electrical contact via a circular connector 2, which is separated by a seal 3 of a metallic candle housing 4 with a - A -
- cylindrical feed line 5 is connected.
- the cylindrical feed 5 is via a contact pin 10 and a suitable contacting element 12, preferably as a contact spring, as an electrically conductive powder package or as an electrically conductive tablet with an elastic
- Spring component preferably made of graphite, is connected to a ceramic glow plug 14.
- the cylindrical feed line 5 can also be combined with the contact pin 10 in one component.
- the interior of the glow plug is sealed by means of a sealing packing 15 with respect to the combustion chamber.
- the sealing packing 15 consists of an electrically conductive carbon compound.
- the packing 15 can also be through metals, a
- the glow plug 14 consists of a ceramic heating layer 18 and ceramic lead layers 20 and 21, wherein the two lead layers 20, 21 through the
- Heating layer 18 are connected and together with the heating layer 18 form a conductive layer.
- the lead layers 20, 21 have an arbitrary shape; the heating layer 18 can also have any desired shape.
- the conductive layer is U-shaped.
- the lead layers 20, 21 are separated by an insulating layer 22, which is also made of ceramic material.
- the glow plug 14 is designed such that the w
- lead layers 20 and 21 are located within the Glühstifles 14 and still from an outer, ceramic, insulating layer to be covered.
- Candle housing 4 the ceramic glow plug 14 by a glass layer, not shown isolated from the other components of the glow plug 4, 8, 12, 15.
- the glass layer is interrupted at the point 24. Further perforation of the glass layer at the point 26 allows electrical contact between the feed layer 21 and the plug housing 4 via the sealing packing 15.
- the heating layer 18 was placed at the tip of the glow plug 14 as a preferred embodiment. However, it is also conceivable to place the heating layer 18 at another location of the conductive layer. The heating layer 18 should be at the
- the material of the heating layer 18 is chosen so that the absolute electrical resistance of the heating layer 18 is greater than the absolute electrical resistance of the supply layers 20, 21. (In the following, the term resistance without addition of the absolute electrical resistance is understood.) To cross currents between the components of the conductive layer, the resistance of the insulating layer is preferably significantly greater than the resistance of the heating layer 18 and the lead layers 20, 21.
- Insulation layer 22 in the entire operating range of the glow plug at least 10 times greater than the specific resistance of the heating layer 18th
- compositions of the insulating layer, the feed layers and the heating layer are chosen in the above-mentioned exemplary embodiments so that their thermal expansion coefficients and the shrinkage occurring during the sintering or pyrolysis process of the individual supply, heating and insulating layers are the same, so that no cracks arise in the glow plug.
- the heating layer 18 is made of an electrically conductive ceramic with a high electrical resistance. It is preferably a ceramic resistor based on a filled organosilicon polymer, such as a polysiloxane or a polysilsesquioxane.
- a polysiloxane is, for example, a condensation-crosslinked polyalkoxysiloxane or an addition-crosslinking polysiloxane such as a
- Methyl-phenyl-vinyl-polysiloxane used.
- Other polymers such as polycarbosilanes and polysilanes may be added to the polysiloxanes used. These can be dissolved in a suitable solvent such as acetone or tetrahydrofuran and mixed with suitable fillers. On the selection and addition amount of one or more suitable fillers, the electrical
- a suitable filler is, for example, molybdenum disilicide mixed with other fillers such as SilMumnitrid, silicon powder, Titansilicid, geroxide, bismuth oxide or barium oxide, in particular silicon carbide, boron carbide, boron nitride or graphite and optionally also carbon nanotubes or alumina.
- the ceramic resistor contains a filler Akuniniumsilikat, wherein the amount of added Alumiruumsilikat is chosen so that can be at least largely dispensed with the addition of alumina.
- the aluminosilicate used preferably has a composition of the formula Al 2 (Al (2 + 2 ⁇ ) Si ⁇ 2- ⁇ ) ) O (1 o- X) with 0.17 ⁇ x ⁇ 0.6.
- Particularly preferred is a mullite with x ⁇ 0.25, since this is thermodynamically stable and contains a high proportion of silicon dioxide. It is ensured that at high temperatures no further mullite is formed by reaction of aluminum oxide of the mullite with silicon dioxide from the ceramic matrix.
- an aluminosilicate which is low in aluminum oxide.
- Particularly suitable is a degree of filling of the ceramic of 35 to 65 wt.%, In particular from 40 to 55 wt.% Based on the solvent-free polymer-filler mixture.
- the aluminum silicate content of the ceramic is preferably 5 to 25 vol.%.
- the fillers preferably have a mean particle size of 0.001 to 100 .mu.m, in particular from 3.5 to 5 microns.
- the average particle size ds 0 of the aluminum silicate used is preferably less than 3 ⁇ m, in particular less than 1 ⁇ m.
- an aluminum complex is used in which U 99 ⁇ 20 microns.
- the aluminosilicate particles used are preferably at least partly spherical.
- the shrinkage behavior of the ceramic during the manufacturing process is essentially determined by the morphology of the aluminum silicate particles. Spherical particles lead to a greater shrinkage with the same
- Mass loss during pyrolysis which can be attributed to the fact that spherical particles can slip past each other better during the shrinkage process compared to irregular shaped particles.
- the result is a ceramic of lower porosity.
- the organosilicon polymer mixed with the filler (s) is first mixed to form a molding compound and subjected to a corresponding molding process. This can, for example. In a pressing, transfer molding, injection molding or other plastic engineering
- the molding is carried out by hot pressing, the intended die is first treated with oleic acid and a weighed amount of the molding compound is added.
- the hot pressing takes place at a temperature of 120 to 170 0 C and a pressure of
- a heat treatment in air for densification of the ceramic and the construction of an oxide layer on the ceramic surface is preferably carried out in the same manner as in the previous pyrolysis.
- first and a second embodiment of aluminum silicate-containing ceramics are listed, wherein the first embodiment corresponds to an electrically insulating ceramic and the second embodiment of an electrically conductive ceramic.
- Zirconium acetylacetonate 2 SIC UF 05, HC Starck, DE 3 : MuIHt NA221, Ibu-Tec GmbH, DE 4 : MoSi 2 Grade C, HC Starck, DE 5 : boron amorphous, Alfa Aesar, DE
- the following table lists the specific electrical resistances of a ceramic produced from a molding compound according to the first exemplary embodiment and for comparison of another ceramic, which is likewise embodied according to the first exemplary embodiment but contains aluminum oxide instead of an aluminum silicate.
- the measurement of the electrical resistance took place directly after the pyrolysis and after a long-term heat treatment at 1390 0 C for 15 hours and then at 1350 0 C for a further 50 hours.
- the ceramic resistor according to the invention is not only suitable as a heating element for glow plugs, but also for heaters of flame candles or ceramic gas sensors and for high temperature applications.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Resistance Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004039925.5 | 2004-08-18 | ||
DE102004039925 | 2004-08-18 | ||
DE102004043873A DE102004043873A1 (de) | 2004-08-18 | 2004-09-10 | Keramischer Widerstand |
DE102004043873.0 | 2004-09-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006018347A1 true WO2006018347A1 (de) | 2006-02-23 |
Family
ID=35721575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/053149 WO2006018347A1 (de) | 2004-08-18 | 2005-07-01 | Keramischer elektrischer widerstand |
Country Status (2)
Country | Link |
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DE (1) | DE102004043873A1 (de) |
WO (1) | WO2006018347A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009005446A1 (de) | 2009-01-21 | 2010-07-22 | Schott Ag | Granulat, Verfahren zu dessen Herstellung sowie dessen Verwendung |
CN102798144A (zh) * | 2012-08-29 | 2012-11-28 | 湖南华菱涟源钢铁有限公司 | 一种手持式绝缘放电型可燃气体点火器 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1814293A1 (de) * | 1967-12-15 | 1969-07-24 | Mueanyagipari Ki | Elektrisch leitende Stoffkombination aus poroesen Stoffen und Kunststoff |
DE3501558A1 (de) * | 1984-01-18 | 1985-07-25 | Ngk Spark Plug Co., Ltd., Nagoya, Aichi | Widerstandszusammensetzung, geeignet zur herstellung eines widerstandes in zuendkerzen |
EP0412428A1 (de) * | 1989-08-07 | 1991-02-13 | Peter Prof. Dr. Greil | Keramische Verbundkörper und Verfahren zu ihrer Herstellung |
DE3546922C2 (de) * | 1984-01-18 | 1997-09-04 | Ngk Spark Plug Co | Pulvermischungen zur Herstellung eines elektrischen Widerstands in Zündkerzen und ihre Verwendung |
EP1035550A2 (de) * | 1999-03-10 | 2000-09-13 | Robert Bosch Gmbh | Keramischer elektrischer Widerstand |
-
2004
- 2004-09-10 DE DE102004043873A patent/DE102004043873A1/de not_active Ceased
-
2005
- 2005-07-01 WO PCT/EP2005/053149 patent/WO2006018347A1/de active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1814293A1 (de) * | 1967-12-15 | 1969-07-24 | Mueanyagipari Ki | Elektrisch leitende Stoffkombination aus poroesen Stoffen und Kunststoff |
DE3501558A1 (de) * | 1984-01-18 | 1985-07-25 | Ngk Spark Plug Co., Ltd., Nagoya, Aichi | Widerstandszusammensetzung, geeignet zur herstellung eines widerstandes in zuendkerzen |
DE3546922C2 (de) * | 1984-01-18 | 1997-09-04 | Ngk Spark Plug Co | Pulvermischungen zur Herstellung eines elektrischen Widerstands in Zündkerzen und ihre Verwendung |
EP0412428A1 (de) * | 1989-08-07 | 1991-02-13 | Peter Prof. Dr. Greil | Keramische Verbundkörper und Verfahren zu ihrer Herstellung |
EP1035550A2 (de) * | 1999-03-10 | 2000-09-13 | Robert Bosch Gmbh | Keramischer elektrischer Widerstand |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009005446A1 (de) | 2009-01-21 | 2010-07-22 | Schott Ag | Granulat, Verfahren zu dessen Herstellung sowie dessen Verwendung |
CN102798144A (zh) * | 2012-08-29 | 2012-11-28 | 湖南华菱涟源钢铁有限公司 | 一种手持式绝缘放电型可燃气体点火器 |
Also Published As
Publication number | Publication date |
---|---|
DE102004043873A1 (de) | 2006-02-23 |
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