CN1007837B - Coating for tubular zirconium-oxide electrode - Google Patents
Coating for tubular zirconium-oxide electrodeInfo
- Publication number
- CN1007837B CN1007837B CN 87104586 CN87104586A CN1007837B CN 1007837 B CN1007837 B CN 1007837B CN 87104586 CN87104586 CN 87104586 CN 87104586 A CN87104586 A CN 87104586A CN 1007837 B CN1007837 B CN 1007837B
- Authority
- CN
- China
- Prior art keywords
- electrode
- zirconium dioxide
- coating
- dioxide pipe
- zirconium
- 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.)
- Expired
Links
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The present invention relates to a coating layer for a zirconium dioxide pipe electrode, which is used for protecting a zirconium dioxide pipe electrode, preventing the erosion of a plurality of harmful gases in smoke gas to the zirconium dioxide pipe electrode and enhancing service life. The coating layer for a zirconium dioxide pipe electrode is a solidification multi-pore solid sintering layer. The coating layer for a zirconium dioxide pipe electrode is the same to a zirconium dioxide pipe basal body, and sintering temperature is 1000 DEG C to 1200 DEG C. The present invention is a novel coating layer material which has the advantages of stable performance, no generation of additional electrical potentials, no performance change of zirconium pipes and electrodes, high temperature resistance, firm bonding and good ventilation property.
Description
The present invention measures oxygen content coating for tubular zirconium-oxide electrode in the gas.
Stably-doped oxidation zirconium pipe, inside and outside wall is coated platinum electrode, constitutes the oxygen determination sensor.Oxygen molecule outside it is heated to more than 600 ℃, and lambda sensor is interior dissociates into oxonium ion, forms interface oxygen current potential.On the electrode (negative electrode) of the higher side of partial pressure of oxygen, the oxygen molecule electron gain dissociates into oxonium ion, and oxonium ion discharges electronics by solid electrolyte to anode, is reduced to oxygen molecule.
Observe the Nernst formula between the oxygen concentration that electromotive force E is corresponding with it between two electrodes on the relational theory
E= (RT)/(nF) ln (P
o)/(P
X)
-gas law constant
n-4
T-absolute temperature
The F-faraday constant
P
0-reference gas oxygen concentration
P
x-tested gas oxygen concentration
If T, P
0Known, can calculate tested oxygen concentration according to the electromotive force E that is surveyed.
When zircite oxygen transmitter is used for the flue gas oxygen determination,, zirconium pipe platinum electrode is corroded and efflorescence, peeling come off electrode failure often because of multiple harmful substances is arranged in the flue gas.With the platinum electrode composition that electron probing analysis was lost efficacy, finding wherein has elements such as sulphur, arsenic, oxygen, illustrates that platinum electrode is subjected to the corrosion of objectionable impurities such as sulfide, arsenide in the flue gas.This is the very fast deterioration of lambda sensor chemical property and the main cause that lost efficacy.
In order to prolong the serviceable life of lambda sensor, strengthen the platinum electrode erosion resistance, increasing people adopts the method at electrode surface coating coating protection electrode.Some patent reports are abroad arranged.Coating material also has multiple, as zirconia-yttria; Zirconia-yttria-lanthana; Aluminium oxide-silicon oxide etc.Jap.P. 61-54443A and 61-54444A report: electrolyte is the zirconia of stabilized with yttrium oxide, and the spraying protective finish identical with electrolyte on electrode is at 1650 ℃ of following sintering.U.S. Pat 4476008 reports: its electrode coating is the mixed-powder that adds the monox of 1-4% in the aluminium oxide, uses plasma spraying, is heated to 1300～1400 ℃ of sintering.
Comprehensive relevant document, external coating for tubular zirconium-oxide electrode material divides two big classes.One class is basic identical with zirconium pipe matrix material.Another kind of is high temperature resistant, the erosion-resisting oxide mixture of other kind that is different from matrix material, coats with spraying process, and sintering temperature is higher than 1300 ℃.
The objective of the invention is to prepare a kind of and electrolyte roughly the same, and solidify lower, anticorrosive, the stable performance of sintering temperature, long-lived coating for tubular zirconium-oxide electrode material.
What the present invention used is the stable tubular zirconium-oxide solid electrolyte of yttrium, and surfaces externally and internally coats platinum electrode and lead-in wire, continue after coat protective finish on detection side zirconium pipe electrode surface.
Coating material of the present invention is with stable zirconia powder, phosphoric acid solution, magnesium oxide, rosin alcoholization solution, be mixed into paste after, coat sintering and form.Its Recipe is as follows:
Stable zirconia powder (200-300 order) 10 grams, phosphoric acid solution 0.3-0.8 gram, magnesium oxide 0.1-0.4 gram, 0.5 milliliter of rosin alcoholization solution (wherein zirconia powder adds calcium stable, and its content is 4-8%).These four kinds of materials are mixed into paste, coat the zirconium tube-surface, electrode promptly is capped.Room temperature is air-dry.
Sintering process:
One hour → 100 ℃ insulations of 80 ℃ of insulations one hour.1000 ℃-1200 ℃ solidified sintering two hours, and then cooled off with stove.
Electrode coating of the present invention is curing porous solid sinter layer, and micro porosity is 10-20%, and the aperture is the 150-300 micron, coats thickness and can be reduced to the 0.2-0.4 millimeter.
Embodiments of the invention are exactly the tubular zirconium-oxide platinum electrode protective finish that produces by above-mentioned prescription and technology.
This coating so do not produce additional potential, does not change the performance of zirconium pipe and electrode because material is identical with solid electrolyte character. Oxonium ion by the little pore of coating, and the side enter electrode, effectively prevented pernicious gas and dust to the erosion of electrode, reach ten times more than service life that has prolonged electrode and zirconium pipe.
With the lambda sensor that adds protective finish that this technology is manufactured, be assembled into the oxygen detector of industrial practicality, result on trial aspect industrial furnace flue gas oxygen determination: the life-span is all more than 1 year, than the Service life of coating not more than ten times. This has proved that this coating has positive effect to preventing electrode corrosion, and has obtained preferably economic benefit and environmental benefit.
Claims (1)
1; a kind of tubular zirconium-oxide electrode protective finish of measuring oxygen content; be specially adapted to measure the oxygen content in the flue gas; this electrode protection coating is made by following prescription and technology; the coating process prescription; be to use the 200-300 order, stable zirconia powder 10 grams (wherein zirconia powder adds calcium stable, and its content is 4-8%); phosphoric acid solution 0.3-0.8 gram; magnesium oxide 0.1-0.4 gram, 0.5 milliliter of rosin alcoholization solution, furnishing paste; be coated on the zirconia platinum electrode; room temperature is air-dry, and sintering process is: 80 ℃ are incubated 1 hour, and 100 ℃ of insulations are after 1 hour; 1000 ℃-1200 ℃ solidified sintering 2 hours, and cooled off with stove then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87104586 CN1007837B (en) | 1987-07-07 | 1987-07-07 | Coating for tubular zirconium-oxide electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87104586 CN1007837B (en) | 1987-07-07 | 1987-07-07 | Coating for tubular zirconium-oxide electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1031098A CN1031098A (en) | 1989-02-15 |
| CN1007837B true CN1007837B (en) | 1990-05-02 |
Family
ID=4814935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87104586 Expired CN1007837B (en) | 1987-07-07 | 1987-07-07 | Coating for tubular zirconium-oxide electrode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007837B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405052C (en) * | 2006-03-23 | 2008-07-23 | 广州杰赛科技股份有限公司 | Co-burning method for oxygen sensor electrolyte and palatinum electrode |
| CN100405053C (en) * | 2006-03-23 | 2008-07-23 | 广州杰赛科技股份有限公司 | Co-burning method for oxygen sensor electrolyte and porous film |
| KR101665155B1 (en) * | 2009-08-21 | 2016-10-11 | 가부시키가이샤 노리타께 캄파니 리미티드 | Zirconia sintered body, and mixture, pre-sintered compact and pre-sintered calcined body for sintering zirconia sintered body |
| CN113430330A (en) * | 2021-06-23 | 2021-09-24 | 北京浩德楚业新材料科技有限公司 | Preparation method of zirconia solid electrolyte tube and oxygen determination probe |
-
1987
- 1987-07-07 CN CN 87104586 patent/CN1007837B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1031098A (en) | 1989-02-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |