CN105087984A - Platinum ceramic and manufacturing method thereof - Google Patents
Platinum ceramic and manufacturing method thereof Download PDFInfo
- Publication number
- CN105087984A CN105087984A CN201510277847.9A CN201510277847A CN105087984A CN 105087984 A CN105087984 A CN 105087984A CN 201510277847 A CN201510277847 A CN 201510277847A CN 105087984 A CN105087984 A CN 105087984A
- Authority
- CN
- China
- Prior art keywords
- platinum
- powder
- pottery
- ceramic
- volume
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/12—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on oxides
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4075—Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts
Abstract
The invention relates to a platinum ceramic, which includes platinum and at least one ceramic material. The platinum content of platinum ceramic contains less than 50 vol.%. The platinum ceramic can be produced by preparing a powder mixture containing platinum powder and at least one ceramic powder, and the powder mixture is then sintered. The proportion of the platinum powder in the powder mixture containing less than 50 vol.% and the proportion of the at least one ceramic powder to the powder mixture contains more than 50 vol. %. The platinum ceramic can be used as electrode lead and / or contact pad of an exhaust gas probe.
Description
Technical field
The present invention relates to platinum pottery and preparation method thereof.In addition the invention still further relates to and use the ceramic contact conductor as waste gas probe of described platinum and/or contact pad.
Background technology
The contact conductor of waste gas probe and contact pad are made up of a kind of platinum pottery usually, and described platinum pottery is be made up of platinum matrix more than 90 volume %, and stupalith is embedded among described platinum matrix.Current stupalith relates to by the partially stabilized zirconium white (zirconium white of stabilized with yttrium oxide: YSZ) of yttrium oxide.Platinum pottery is prepared from by carrying out sintering at about 1400 DEG C of temperature.Platinum content high in platinum pottery causes the cost of the contact pad of contact conductor region and subordinate higher.The surface portion of platinum ceramic lead comprises contact pad and usually accounts for be made up of electrode, contact conductor and contact pad always print electrode more than 60%.Platinum ceramic lead and contact pad are positioned at an insulating layer.The platinum electrode part of subordinate is positioned at above ionogen.Lead areas is enclosed in by among the insulation layer that aluminum oxide is formed.In a sensor element, be integrated with two electrodes when oxygen sensor and be even integrated with 3 when broadband oxygen sensor (LSU) and print electrode.
Summary of the invention
Comprise the steps: according to the preparation method of platinum pottery of the present invention
-powdered mixture is provided, described powdered mixture has, especially containing platinum powder and at least one ceramic powder, wherein in powdered mixture, the content of platinum powder is in and is more than or equal to 25 volume % to being less than or equal to 50 volume %, preferably be less than or equal to 45 volume %, especially 40 volume % scopes are preferably less than or equal to and the content of at least one ceramic powder is in and is more than or equal to 50 volume % to being less than or equal to 75 volume % in powdered mixture, preferably greater than or equal to 55 volume %, especially preferably greater than or equal to 60 volume % scopes, and
-sintering, especially dense sintering powdered mixture.
Make to prepare so a kind of platinum pottery according to method of the present invention and become possibility, described platinum pottery is suitable for contact conductor and contact pad and has quite low platinum content relative to traditional platinum pottery in high temperature range.Thus, can implement according to method of the present invention with obvious lower expense compared with the preparation method of traditional platinum pottery.
The sintering activity of at least one ceramic powder is preferably greater than the sintering activity of platinum powder.If the mean particle size of at least one ceramic powder is less than platinum powder, then regards it as according to the present invention and have more sintering activity than platinum powder.Alternatively, if at least one ceramic powder has larger BET-surface according to DIN-ISO9277 standard compared with platinum powder, then especially regard it as according to the present invention and have more sintering activity than platinum powder.Because at least one ceramic powder has larger sintering activity, this causes the volume of the ceramic phase when sintering to reduce very early, thus fixing metal platinum matrix.During this external sintering, the volume-diminished of metallographic phase is lower than the volume-diminished of ceramic phase, causes ceramic phase to be that sintering is on metallographic phase seemingly.The region of the platiniferous be separated from each other is wherein connected to each other together, thus produces the good electric conductivity of platinum pottery.
Preferably ceramic powder is nanocrystal, and the advantage of nanocrystal ceramic powder is, it has high surface-area and is special sintering activity thus.
Preferred use alumina powder (Al
2o
3), magnesia spinel powder (MgAl
2o
4) or their mixture as ceramic powder.Compared with nanocrystal ceramic powder, ceramic powder can be provided with lower cost.Especially preferably ceramic powder is magnesia spinel powder, and this powder can make to be sintered into possibility at temperature low especially.
Preferably lower than at the temperature of 1400 DEG C, especially preferred lower than at the temperature of 1350 DEG C, sinter particularly preferably at the temperature of the highest 1300 DEG C.Compared with the preparation method of platinum pottery that is traditional, that implement at the temperature of about 1400 DEG C, especially when using magnesia spinel powder as ceramic powder, this makes to implement to become possibility according to method of the present invention energy-conservationly.
In order to avoid the interference effect of foreign matter, preferred powdered mixture does not contain other sintered material except platinum powder and at least one ceramic powder.
Comprise platinum and at least one stupalith according to platinum pottery of the present invention, wherein the platinum content of platinum pottery is for being less than 50 volume %, is preferably less than 45 volume %, is particularly preferably less than 40 volume %.
Preferred platinum pottery comprises the platinum phase be associated, thus ensures the high electric conductivity of platinum pottery.
The stupalith of preferred platinum pottery is aluminum oxide, magnesia spinel or their mixture, wherein especially preferably magnesium spinel.Guarantee whereby easily to prepare platinum pottery.
In order to high thermal resistance and the good electric conductivity of platinum pottery, preferred platinum pottery does not contain other material except platinum and at least one stupalith.
Especially can by preparing according to method of the present invention according to platinum pottery of the present invention.Preferably by ceramic according to platinum of the present invention according to method preparation of the present invention, can provide in mode that is simple and low cost whereby.
According to platinum of the present invention pottery because its high thermal resistance and good electric conductivity especially can be used as contact conductor and/or the contact pad of waste gas probe.
Accompanying drawing explanation
Embodiments of the invention are shown in the drawings and be explained in detail in the following description.
Fig. 1 is the displaing micro picture of the platinum pottery according to the first embodiment of the present invention.
Fig. 2 is the displaing micro picture of the platinum pottery according to an alternative embodiment of the invention.
Embodiment
In the first embodiment of the present invention, the powdered mixture be made up of the magnesia spinel powder of platinum powder and nanocrystal at the temperature of 1300 DEG C by dense sintering.Obtain a kind of platinum pottery whereby, described platinum pottery at the most 38 volume % be made up of platinum and is made up of magnesia spinel with 62 volume % at the most.Be depicted as a part for the surperficial displaing micro picture of the platinum pottery taken by scanning electron microscopy (REM) when voltage is 10kV and scale-up factor is 5000 in FIG.Wherein platinum matrix is shown as black and ceramic phase is shown as white.Can identify, platinum pottery has the platinum matrix be associated, and platinum pottery has good electric conductivity thus.
A kind of powdered mixture is shown in the second embodiment of the present invention, the alumina powder of the platinum powder that described powdered mixture sinters under being included in the temperature of 1400 DEG C and nanocrystal.Obtain a kind of platinum pottery, its platinum matrix accounts for 38 volume % of platinum pottery, and ceramic phase is equivalent to 62 volume %.Be depicted as the macroscopic surface image of this platinum pottery in fig. 2.This image takes under the measuring condition identical with the image shown in Fig. 1.Also a platinum phase be associated is had according to the platinum pottery of the second embodiment of the present invention.
Can be processed to according to the platinum pottery of two embodiments of the present invention can the platinum ceramic size of silk screen printing.Described platinum ceramic size can be used to prepare the contact conductor of waste gas probe and contact pad and be can with remaining ceramic system co-sintering of waste gas probe.
Claims (10)
1. the preparation method of platinum pottery, it comprises the steps:
-powdered mixture is provided, described powdered mixture has, especially containing platinum powder and at least one ceramic powder, wherein in powdered mixture, the content of platinum powder is in and is more than or equal to 25 volume % to being less than or equal to 50 volume % scopes and the content of at least one ceramic powder is in and is more than or equal to 50 volume % to being less than or equal to 75 volume % scopes in powdered mixture, and
-sinter described powdered mixture.
2. method according to claim 1, is characterized in that, the sintering activity of described at least one ceramic powder is greater than the sintering activity of platinum powder.
3. method according to claim 1 and 2, is characterized in that, ceramic powder is nanocrystal.
4. the method according to any one of claim 1-3, is characterized in that, ceramic powder is Al
2o
3-powder, MgAl
2o
4-powder or their mixture.
5. the method according to any one of claim 1-4, is characterized in that, sinters at lower than the temperature of 1400 DEG C.
6. platinum pottery, comprise platinum and at least one stupalith, wherein the platinum content of platinum pottery is for being less than 50 volume %.
7. platinum pottery according to claim 6, it is characterized in that, it comprises the platinum phase be associated.
8. the platinum pottery according to claim 6 or 7, it is characterized in that, described stupalith is Al
2o
3, MgAl
2o
4or their mixture.
9. the platinum pottery according to any one of claim 6-8, it is characterized in that, it can be prepared by the method according to any one of claim 1-5.
10. the platinum pottery according to any one of claim 6-9 is as the contact conductor of waste gas probe and/or the purposes of contact pad.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014209029.6 | 2014-05-13 | ||
| DE102014209029.6A DE102014209029A1 (en) | 2014-05-13 | 2014-05-13 | Platinumermet and process for its preparation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105087984A true CN105087984A (en) | 2015-11-25 |
Family
ID=54361618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510277847.9A Pending CN105087984A (en) | 2014-05-13 | 2015-05-12 | Platinum ceramic and manufacturing method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105087984A (en) |
| DE (1) | DE102014209029A1 (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4409135A (en) * | 1980-04-25 | 1983-10-11 | Nissan Motor Company, Limited | Paste containing electrically conducting powder to form conducting solid filler in cavity in ceramic substrate |
| JPS58198754A (en) * | 1982-05-14 | 1983-11-18 | Nissan Motor Co Ltd | Manufacture of substrate having heater for gas sensor element |
| EP1026502A2 (en) * | 1999-02-03 | 2000-08-09 | NGK Spark Plug Company Limited | Solid electrolyte containing insulating ceramic grains for gas sensor, and method for fabricating same |
| CN1359526A (en) * | 1999-07-13 | 2002-07-17 | 罗伯特·博施有限公司 | Heat conductor, especially for a sensor, and method for producing such a heat conductor |
| CN102246028A (en) * | 2008-12-15 | 2011-11-16 | 罗伯特·博世有限公司 | Structured electrode for ceramic sensor elements |
| CN102616036A (en) * | 2012-04-10 | 2012-08-01 | 无锡隆盛科技有限公司 | Manufacture method of heater capable of reducing light-off time of planar oxygen sensor |
| CN102970780A (en) * | 2011-08-30 | 2013-03-13 | 株式会社电装 | Ceramic heater and gas sensor element |
| JP2014066547A (en) * | 2012-09-25 | 2014-04-17 | Tanaka Kikinzoku Kogyo Kk | Sensor electrode and manufacturing method thereof, and metallic paste for electrode formation |
-
2014
- 2014-05-13 DE DE102014209029.6A patent/DE102014209029A1/en not_active Withdrawn
-
2015
- 2015-05-12 CN CN201510277847.9A patent/CN105087984A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4409135A (en) * | 1980-04-25 | 1983-10-11 | Nissan Motor Company, Limited | Paste containing electrically conducting powder to form conducting solid filler in cavity in ceramic substrate |
| JPS58198754A (en) * | 1982-05-14 | 1983-11-18 | Nissan Motor Co Ltd | Manufacture of substrate having heater for gas sensor element |
| EP1026502A2 (en) * | 1999-02-03 | 2000-08-09 | NGK Spark Plug Company Limited | Solid electrolyte containing insulating ceramic grains for gas sensor, and method for fabricating same |
| CN1359526A (en) * | 1999-07-13 | 2002-07-17 | 罗伯特·博施有限公司 | Heat conductor, especially for a sensor, and method for producing such a heat conductor |
| CN102246028A (en) * | 2008-12-15 | 2011-11-16 | 罗伯特·博世有限公司 | Structured electrode for ceramic sensor elements |
| CN102970780A (en) * | 2011-08-30 | 2013-03-13 | 株式会社电装 | Ceramic heater and gas sensor element |
| CN102616036A (en) * | 2012-04-10 | 2012-08-01 | 无锡隆盛科技有限公司 | Manufacture method of heater capable of reducing light-off time of planar oxygen sensor |
| JP2014066547A (en) * | 2012-09-25 | 2014-04-17 | Tanaka Kikinzoku Kogyo Kk | Sensor electrode and manufacturing method thereof, and metallic paste for electrode formation |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014209029A1 (en) | 2015-11-19 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151125 |
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| RJ01 | Rejection of invention patent application after publication |