WO1999005077A1 - Electroconductive ceramic material - Google Patents
Electroconductive ceramic material Download PDFInfo
- Publication number
- WO1999005077A1 WO1999005077A1 PCT/IB1998/000824 IB9800824W WO9905077A1 WO 1999005077 A1 WO1999005077 A1 WO 1999005077A1 IB 9800824 W IB9800824 W IB 9800824W WO 9905077 A1 WO9905077 A1 WO 9905077A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chromite
- lanthanum
- ceramic material
- yttrium
- dioxide
- Prior art date
Links
- 229910010293 ceramic material Inorganic materials 0.000 title claims description 13
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 13
- NFYLSJDPENHSBT-UHFFFAOYSA-N chromium(3+);lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+3].[La+3] NFYLSJDPENHSBT-UHFFFAOYSA-N 0.000 claims abstract description 12
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 12
- ROKHXTDWQPQQEO-UHFFFAOYSA-N [Y+3].[Y+3].[O-][Cr]([O-])=O.[O-][Cr]([O-])=O.[O-][Cr]([O-])=O Chemical compound [Y+3].[Y+3].[O-][Cr]([O-])=O.[O-][Cr]([O-])=O.[O-][Cr]([O-])=O ROKHXTDWQPQQEO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 11
- JWCPKKUXENYVPL-UHFFFAOYSA-N [Mg+2].[O-][Cr]([O-])=O Chemical compound [Mg+2].[O-][Cr]([O-])=O JWCPKKUXENYVPL-UHFFFAOYSA-N 0.000 claims abstract description 10
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims abstract description 10
- -1 lanthanum aluminate Chemical class 0.000 claims abstract description 10
- 239000004615 ingredient Substances 0.000 claims description 5
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims 2
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 claims 2
- 229910002262 LaCrO3 Inorganic materials 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- 238000006467 substitution reaction Methods 0.000 claims 1
- 239000000919 ceramic Substances 0.000 abstract description 13
- 238000010438 heat treatment Methods 0.000 abstract description 13
- 239000000654 additive Substances 0.000 abstract description 3
- 238000005275 alloying Methods 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 18
- 239000000463 material Substances 0.000 description 12
- 230000004580 weight loss Effects 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- 229920005372 Plexiglas® Polymers 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000013077 target material Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
- H01B1/08—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances oxides
-
- 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
- C04B35/42—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 chromites
-
- 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
- H05B3/14—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 the material being non-metallic
- H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
Definitions
- the present invention relates to the field of producing high-temperature ceramics and can be used in manufacturing high-temperature heaters, semiconductors, thermocouples, temperature sensors, as additives in manufacturing conventional ceramics and in other fields requiring high thermal and chemical stability and high electric conductivity when operating in air, and in medical practice.
- An elcctroconductive material is known on the basis of rare-earth chromites, such as lanthanum and/or yttrium chromite with additions of zirconium dioxide and rare-earth oxides, which is intended for stable operation at high temperatures, about 2 000°K.
- the amount of zirconium dioxide must exceed 5 raol%, preferably 30-50 mol% (see US Patent # 3 475 352, "Electrically conductive ceramic material", national classification 252- 520, published 28.10.1969).
- a serious shortcoming of the said ceramic material is its low permissible rate of heating, relatively low reliability of operation at 1 600°C, and low thermal stability when operating at about 1 500°C.
- the object of the present invention is to create a ceramic material that will have a high heating rate, a higher thermal stability and a higher reliability when operating at high temperatures.
- the goal is achieved by modifying the target material, based on lanthanum chromite and containing zirconium dioxide, witli alloying and stabilizing additives of lanthanum aluminate, yttrium chromite, magnesium chromite and cerium dioxide, in the following ratio of ingredients, wt%: lanthanum aluminate 0.50 ⁇ 10.0 yttrium chromite 0.50 ⁇ 3.0 magnesium chromite 1.0 ⁇ 15.0 cerium dioxide 0. X1.0 zirconium dioxide 0.50X.0 lanthanum chromite the rest
- the material was obtained in the following manner. After preparing a charge of the necessary composition it was mixed in a planetary mill using plexiglass drums and teflon balls as milling bodies. The resulting powder was dried and melted in a solar furnace. The melt was cooled, ground and pressed into specimens of 50x6x6 mm in the middle and 50x6x12 at the ends for measuring maximum heating rate, of 40x4x4 mm for measuring electric conductivity, and of 15 mm in diameter and height for the rest of the tests.
- the specimens were sintered in a lanthanum chromite furnace at 1 600°C for
- the specimens thus prepared were held at 1 500°C for 60 hours for determining thermal stability at that temperature, and at 1 600°C for 20 hours for determining weight loss.
- the specimens of 40x4x4 mm were metallized at the ends.
- a charge was prepared of the following composition, wt%: lanthanum aluminate 0.30 yttrium chromite 0,30 magnesium chromite 0.50 cerium dioxide 0.05 zirconium dioxide 0.30 lanthanum chromite the rest
- the charge was mixed in plexiglass drums in a planetary mill using teflon balls, dried, melted in a solar furnace, cooled, ground and pressed into specimens of various dimensions and shapes.
- the specimens were sintered in a lanthanum chromite furnace at 1 600°C for
- the weight loss after 20 hours hold at 1 600°C was 1.2%, which is twice as much than the prototype material was.
- the electric resistivity was 312.6 Ohmxcm.
- the compressive strength after 60 hours hold at 1 500°C decreased from 72.6 MPa to 18.4 MPa.
- the ceramic material was prepared in the same way as in Example 1 , except that the ceramic composition was that given in column II of Table 1. In that case all the properties of the novel ceramic material were better than those of the prototype (see Table 1).
- Example 1 All the steps followed were the same as in Example 1 , except that the ceramic composition was that given in column III of Table 1 . In that case all the properties of the target material were greatly improved: maximum heating rate increased 5 times, weight loss decreased to 0.2%, resistivity decreased to 8.2 Ohmxcm, compressive strength was 144.1 MPa, and its degradation after 60 hours hold at 1 500°C was only 3.8.
- Example 1 All the steps followed were the same as in Example 1 , except that the 5 composition was that given in column V of Table 1. Resistivity increased so much that a specimen could not be sufficiently heated to measure maximum heating rate.
- maximum heating rate is 10 degrees per minute
- weight loss is 0.55 to 0.6%
- resistivity is 50 to 4800 Ohmxcm
- compressive strength is 96 to 135 MPa
- compressive strength after 60 hours hold at 1 500°C is 10.2 to 16.1 MPa.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Conductive Materials (AREA)
- Fuel Cell (AREA)
- Resistance Heating (AREA)
Abstract
The invention relates to the field of producing electroconductive ceramics on the basis of lanthanum chromite and intended for high-temperature applications (about 2000K). The object of the invention is to increase the heating rate of the ceramics, which will make it possible to reduce the time of the working operation, and ensure its improved thermal stability, which will increase the reliability of operation at high temperature. The goal is achieved by supplementing ceramics based on lanthanum chromite and containing zirconium dioxide, with alloying and stabilizing additives of lanthanum aluminate, yttrium chromite, magnesium chromite and cerium dioxide.
Description
ELECTROCONDUCTIVE CERAMIC MATERIAL
The present invention relates to the field of producing high-temperature ceramics and can be used in manufacturing high-temperature heaters, semiconductors, thermocouples, temperature sensors, as additives in manufacturing conventional ceramics and in other fields requiring high thermal and chemical stability and high electric conductivity when operating in air, and in medical practice.
An elcctroconductive material is known on the basis of rare-earth chromites, such as lanthanum and/or yttrium chromite with additions of zirconium dioxide and rare-earth oxides, which is intended for stable operation at high temperatures, about 2 000°K. In this case the amount of zirconium dioxide must exceed 5 raol%, preferably 30-50 mol% (see US Patent # 3 475 352, "Electrically conductive ceramic material", national classification 252- 520, published 28.10.1969).
Better results are obtained with compositions containing 33 mol% LaCr0 ., 16 mol% Gd203, the rest being Zr02 (Composition 1) and 33 mol% LaCr03 and the rest, Zrϋ (Composition 2). Hereinafter, the properties of the novel material are compared with those of the ceramics of the two compositions.
A serious shortcoming of the said ceramic material is its low permissible rate of heating, relatively low reliability of operation at 1 600°C, and low thermal stability when operating at about 1 500°C.
The object of the present invention is to create a ceramic material that will have a high heating rate, a higher thermal stability and a higher reliability when operating at high temperatures.
The goal is achieved by modifying the target material, based on lanthanum chromite and containing zirconium dioxide, witli alloying and stabilizing
additives of lanthanum aluminate, yttrium chromite, magnesium chromite and cerium dioxide, in the following ratio of ingredients, wt%: lanthanum aluminate 0.50~10.0 yttrium chromite 0.50~3.0 magnesium chromite 1.0~15.0 cerium dioxide 0. X1.0 zirconium dioxide 0.50X.0 lanthanum chromite the rest
The material was obtained in the following manner. After preparing a charge of the necessary composition it was mixed in a planetary mill using plexiglass drums and teflon balls as milling bodies. The resulting powder was dried and melted in a solar furnace. The melt was cooled, ground and pressed into specimens of 50x6x6 mm in the middle and 50x6x12 at the ends for measuring maximum heating rate, of 40x4x4 mm for measuring electric conductivity, and of 15 mm in diameter and height for the rest of the tests.
The specimens were sintered in a lanthanum chromite furnace at 1 600°C for
12 hours. The specimens thus prepared were held at 1 500°C for 60 hours for determining thermal stability at that temperature, and at 1 600°C for 20 hours for determining weight loss. To measure conductivity, the specimens of 40x4x4 mm were metallized at the ends.
To measure maximum heating rate the appropriate specimens were put in a corundum chamber and, after having a thermocouple attached to them, were energized and heated at various rates. Then the specimens were examined on a cross-section. When a certain heating rate was exceeded the specimens disintegrated owing to cracking at the surface and the inner layer melting through because of the low thermal conductivity and inverse temperature dependence of electric conductivity. The results obtained for various ceramic compositions are listed in Tables 1 to 1 1.
Given below are examples of preparing the ceramic material according to the present invention.
Example 1.
A charge was prepared of the following composition, wt%: lanthanum aluminate 0.30 yttrium chromite 0,30 magnesium chromite 0.50 cerium dioxide 0.05 zirconium dioxide 0.30 lanthanum chromite the rest
The charge was mixed in plexiglass drums in a planetary mill using teflon balls, dried, melted in a solar furnace, cooled, ground and pressed into specimens of various dimensions and shapes.
For measuring the maximum heating rate, plates were used of 50x6x6 mm in the middle and 50x6x12 mm at the ends.
For measuring electric conductivity, plates of 40x4x4 mm were used.
For measuring weight loss and thermal stability, cylinders of 15 mm in diameter and height were used.
The specimens were sintered in a lanthanum chromite furnace at 1 600°C for
12 hours. Then they were held at 1 500°C for 60 hours to determine thermal stability at that temperature, and at 1 600°C for 20 hours to measure weight loss. The specimens of 40x4x4 mm, for measuring electric conductivity, were metallized at the ends.
In measuring maximum heating rate the specimens — plates with a different thickness in the middle and at the ends — were put in a corundum chamber,
had a thermocouple attached to them, were energized and heated at various rates. Then the specimens were examined on a cross-section. When heated at a rate of 5K/min the specimens were in a good condition, but at a rate of 1 OK/min they exhibited cracking.
The weight loss after 20 hours hold at 1 600°C was 1.2%, which is twice as much than the prototype material was. The electric resistivity was 312.6 Ohmxcm.
The compressive strength after 60 hours hold at 1 500°C decreased from 72.6 MPa to 18.4 MPa.
Thus, almost all the properties of this composition turned out to be inferior to those of the prototype.
Example 2.
The ceramic material was prepared in the same way as in Example 1 , except that the ceramic composition was that given in column II of Table 1. In that case all the properties of the novel ceramic material were better than those of the prototype (see Table 1).
Example 3.
All the steps followed were the same as in Example 1 , except that the ceramic composition was that given in column III of Table 1 . In that case all the properties of the target material were greatly improved: maximum heating rate increased 5 times, weight loss decreased to 0.2%, resistivity decreased to 8.2 Ohmxcm, compressive strength was 144.1 MPa, and its degradation after 60 hours hold at 1 500°C was only 3.8.
Example 4.
All the steps followed were the same as in Example 1 , except that the composition was that given in column IV of Table 1. In that case the main
properties of the novel material were also higher than those of the prototype except resistivity.
Example 5.
All the steps followed were the same as in Example 1 , except that the 5 composition was that given in column V of Table 1. Resistivity increased so much that a specimen could not be sufficiently heated to measure maximum heating rate.
Example 6.
All the steps followed were those of Examples 1 to 5, except that all the i() compositions used the minimal (Table 2) and maximal (Table 3) concentrations of lanthanum aluminate. As can be seen from the data given, the main properties for columns II to IV of the tables exceed those of the prototype material.
Example 7.
15 All the steps followed were those of Examples I to 6, except that all the compositions of the novel ceramic used the minimal (Table 4) and maximal (Table 5) concentrations of yttrium chromite. As can be seen from the data given, the main properties for columns II to IV of the tables exceed those of the prototype material.
20 Example 8.
All the steps followed were those of Examples 1 to 7, except that all the compositions of the novel ceramic used the minimal (Table 6) and maximal (Table 7) concentrations of magnesium chromite. As can be seen from the data given, the main properties for columns IT to TV of the tables exceed 25 those of the prototype material.
Example 9.
All the steps followed were those of Examples 1 to 8, except that all the compositions of the novel ceramic used the minimal (Table 8) and maximal (Table 9) concentrations of cerium dioxide. As can be seen from the data given, the main properties for columns II to IV of the tables exceed those of the prototype material.
Example 10.
All the steps followed were those of Examples 1 to 9, except that all the compositions of the novel ceramic used the minimal (Table 10) and maximal (Table 1 1) concentrations of zirconium dioxide. As can be seen from the data given, the main properties for columns II to IV of the tables exceed those of the prototype material.
Given below are tables comparing properties for various compositions of the novel ceramic material with the corresponding properties for the prototype material.
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
Ingredients and Ingredient content, wt% main properties
II HI IV VI
lanthanum aluminate 0.30 0.50 3.00 10.00 12.00 prototype yttrium chromite 0.30 0.50 2.50 3.00 4.00 magnesium chromite 0.50 1.00 10.00 15.00 20.00 cerium dioxide 0.05 0.10 1.00 1.00 2.00 zirconium dioxide 0.50 0.50 0.50 0.50 0.50 lanthanum chromite the rest the rest the rest the rest the rest maximum heating rate
K/min 5 15 50 20 - 10 weight loss, % 0.9 0.5 0.3 0.4 1.0 0.55-0.6 resistivity, Ohmxcm 372.8 124.0 7.1 768.3 1987.7 50-4800 compressive strength,
MPa 92.6 96.3 123.1 103.3 89.8 96-135 compressive strength,
MPa (1 500°C/60h) 21.3 71.4 101.6 36.9 32.2 10.2-16.1
Table 11
As can be seen from the tables, for the prototype material obtained by the same technology, maximum heating rate is 10 degrees per minute, weight loss is 0.55 to 0.6%, resistivity is 50 to 4800 Ohmxcm, compressive strength is 96 to 135 MPa, and compressive strength after 60 hours hold at 1 500°C is 10.2 to 16.1 MPa.
Thus, the use of this technical decision to permits increase maximum heating rate 5 times, reduce weight loss 3 times (these two parameters are the principal shortcomings of the prototype), and decrease compressive strength degradation after 60 hours hold at 1 500°C 9 times while increasing this property about 1 .5 times.
Claims
CLAIM
An electroconductive ceramic material containing lanthanum chromite and zirconium dioxide, whose distinguishing feature is that it also contains lanthanum aluminate, yttrium chromite, magnesium chromite and cerium dioxide in the following ratio of ingredients, wt%: lanthanum aluminate 0.50-10.0 yttrium chromite 0.50-3.0 magnesium chromite 1.0-15.0 cerium dioxide 0.1-1 .0 zirconium dioxide 0.50-5.0 lanthanum chromite the rest
AMENDED CLAIMS
[received by the International Bureau on 31 October 1998 (31.10.98); original claim replaced by amended claim (1 page)]
An electroconductive ceramic material containing magnesium chromite, yttrium chromite, zirconium dioxide, cerium dioxide, lanthanum chromite, whose distinguishing feature is that it also contains lanthanum aluminate in the following ratio of ingredients, wt%: lanthanum aluminate La Al2O 0.50-10.0 magnesium chromite Mg CrO4 1.0-15.0 yttrium chromite Y CrO3 0.50-3.0 zirconium dioxide Zr O2 0.50-5.0 cerium dioxide Ce O2 0.1-1.0 lanthanum chromite LaCrO3 remainder
STATEMENT UNDER ARTICLE 19
The Applicant wishes to amend the claim in connection with substitution of the prototype.
As a result of the International search the new information has been found out: Patent WO 93 26011 A (MITECH SCIENT CORP) 23 December 1993.
In this Patent is given a description of ceramic material, which is the most close to the applicated ceramic material according to this PCT Application PCT /IB 98/ 00824 and evidently must be taken as a prototype to this invention.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL13413598A IL134135A0 (en) | 1997-07-25 | 1998-05-27 | Electroconductive ceramic material |
| EA200000153A EA001965B1 (en) | 1997-07-25 | 1998-05-27 | Electroconductive ceramic material |
| KR1020007000837A KR20010022264A (en) | 1997-07-25 | 1998-05-27 | Electroconductive ceramic material |
| AU72301/98A AU7230198A (en) | 1997-07-25 | 1998-05-27 | Electroconductive ceramic material |
| JP2000504080A JP2001510772A (en) | 1997-07-25 | 1998-05-27 | Electrically conductive ceramic material |
| EP98919439A EP1017647A1 (en) | 1997-07-25 | 1998-05-27 | Electroconductive ceramic material |
| US09/486,775 US6200501B1 (en) | 1997-07-25 | 1998-05-27 | Electroconductive ceramic material |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| UZINDR9700645.1 | 1997-07-25 | ||
| UZ9700645 | 1997-07-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999005077A1 true WO1999005077A1 (en) | 1999-02-04 |
Family
ID=25546921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB1998/000824 WO1999005077A1 (en) | 1997-07-25 | 1998-05-27 | Electroconductive ceramic material |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6200501B1 (en) |
| EP (1) | EP1017647A1 (en) |
| JP (1) | JP2001510772A (en) |
| KR (1) | KR20010022264A (en) |
| AU (1) | AU7230198A (en) |
| EA (1) | EA001965B1 (en) |
| IL (1) | IL134135A0 (en) |
| TR (1) | TR200000240T2 (en) |
| WO (1) | WO1999005077A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10163087B4 (en) * | 2002-10-30 | 2006-04-27 | Ibt.Infrabiotech Gmbh | Infrared radiator for the thermal treatment of goods |
| DE102007015261A1 (en) | 2007-03-27 | 2008-10-02 | Aacure Aadhesives Gmbh | Reactive mass for substrate application, preferably for the generation of a glop-top, comprises a thermally initiable matrix forming material and an energy absorbing initiator, where the initiator is soluble in the reactive mass |
| KR101189392B1 (en) * | 2010-07-30 | 2012-10-10 | 엘지이노텍 주식회사 | Silicon carbide manufacturing method using ball |
| JP6901265B2 (en) * | 2017-01-12 | 2021-07-14 | 日本特殊陶業株式会社 | Conductive oxide sintered body and ceramic element |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993026011A1 (en) * | 1992-06-17 | 1993-12-23 | Mitech Scientific Corporation | Radiation emitting ceramic materials, devices containing same and methods of use thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1468883A (en) * | 1965-11-03 | 1967-02-10 | Commissariat Energie Atomique | Electrically conductive ceramic material, manufacturing process and applications |
| JP3388306B2 (en) * | 1996-02-01 | 2003-03-17 | 株式会社ニッカトー | Electric furnace |
-
1998
- 1998-05-27 WO PCT/IB1998/000824 patent/WO1999005077A1/en not_active Application Discontinuation
- 1998-05-27 JP JP2000504080A patent/JP2001510772A/en active Pending
- 1998-05-27 KR KR1020007000837A patent/KR20010022264A/en not_active Application Discontinuation
- 1998-05-27 IL IL13413598A patent/IL134135A0/en unknown
- 1998-05-27 US US09/486,775 patent/US6200501B1/en not_active Expired - Fee Related
- 1998-05-27 EA EA200000153A patent/EA001965B1/en not_active IP Right Cessation
- 1998-05-27 AU AU72301/98A patent/AU7230198A/en not_active Abandoned
- 1998-05-27 EP EP98919439A patent/EP1017647A1/en not_active Withdrawn
- 1998-05-27 TR TR2000/00240T patent/TR200000240T2/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993026011A1 (en) * | 1992-06-17 | 1993-12-23 | Mitech Scientific Corporation | Radiation emitting ceramic materials, devices containing same and methods of use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001510772A (en) | 2001-08-07 |
| US6200501B1 (en) | 2001-03-13 |
| AU7230198A (en) | 1999-02-16 |
| EP1017647A1 (en) | 2000-07-12 |
| EA001965B1 (en) | 2001-10-22 |
| KR20010022264A (en) | 2001-03-15 |
| EA200000153A1 (en) | 2000-08-28 |
| IL134135A0 (en) | 2001-04-30 |
| TR200000240T2 (en) | 2000-08-21 |
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