CN1007193B - Sensing element for combustible gas - Google Patents
Sensing element for combustible gasInfo
- Publication number
- CN1007193B CN1007193B CN 88100227 CN88100227A CN1007193B CN 1007193 B CN1007193 B CN 1007193B CN 88100227 CN88100227 CN 88100227 CN 88100227 A CN88100227 A CN 88100227A CN 1007193 B CN1007193 B CN 1007193B
- Authority
- CN
- China
- Prior art keywords
- gas
- sensing element
- combustible gas
- smog
- present
- 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
Abstract
The present invention relates to a sensing element for combustible gas, which is prepared by adopting a new composite oxide material system. The present invention has strong capability of resisting interference of moisture, ethanol, smog, etc., and has the characteristics of high detection sensitivity to H2, CH4, C2H8, C4H10, C6H12 and other combustible gas, quick response recovery, high stability of long term operation, etc. The resistance value of the gas sensing element prepared according to the present invention in pure air can be regulated in a large range, and the gas sensing element has strong adaptability to complete machine alarm.
Description
The invention belongs to Metal Oxide Semiconductor Gas Sensing component fabrication technology.
When utilizing semiconductor gas sensor that imflammable gas is detected in real time, because some semiconductor gas sensor is to the detection sensitivity height of ethanol and smog, it is bigger influenced by airborne aqueous vapor, problem such as therefore often have the wrong report of the imflammable gas alarm that causes because of disturbing factors such as gas, ethanol and smog and fail to report.
Japan Patent (patent No. J60100753, J59019849) does not relate to the anti-interference problem to smog though reached element to the purpose that the ethanol gas detection sensitivity reduces.
Japan Patent (patent No. J60170759) utilizes α-Fe
2O
3Be main material, SnO
2, Sn and Pt be the sensing element for combustible gas of additive preparation, with CO
2Gas is also included among the imflammable gas, that is to say that this element is to the main gas componant CO in the smog
2Also has higher detection sensitivity.
The gas sensor ubiquity is the degradation problem under high humidity environment medium sensitivity, the gas sensor that Japan Patent (patent No. J57116242) provides, although solved ammonia and the ethanol interference problem when element detects imflammable gas such as hydrogen, methane, propane, butane, but the influence of humidity is failed to obtain satisfied result, can only under the situation of relative humidity 40-85%, use.Element is one of key factor that influences its long-term working stability to the absorption of water in air gas.
The objective of the invention is to utilize γ-Fe
2O
3, SnO
2For main material with Al
2O
3, interference such as MgO to be auxiliary material prepare under certain process conditions anti-high humidity and ethanol, smog, have New Flammable Gas senser than high selectivity, sensitivity and long-term working stability.
The present invention is with γ-Fe
2O
3, SnO
2With Al
2O
3, at least a Fe by weight percentage among the MgO
2O
35-30g, SnO
249-95g, Al
2O
30-20g, MgO0-1g fully behind the mixed grinding, after 60-120 minute, make high selectivity, sensing element for combustible gas through 550-780 ℃ of lower temperature sintering.
According to gas sensor provided by the invention, have following advantage:
A, higher to the detection sensitivity of imflammable gas such as methane, town gas, liquefied petroleum gas, gasoline and hydrogen.Element sensitivity S=R
0/ Rx(R
0Be the resistance of semiconductor gas sensor in pure air, Rx is that gas sensor is containing the airborne resistance of a certain amount of imflammable gas), R of the present invention
0The ratio that contains 10% resistance Rx of the corresponding LEL of imflammable gas with element in air is not less than 5.
B, element analog value under 70 ℃ of saturated steam situations only is equivalent to the response of 200PPm town gas.
C, element to the response of 2000PPm ethanol steam and II grade standard smog (is 20% because of smog causes light extinction rate) less than corresponding imflammable gas to be checked near alarm point response 1/3.
D, element the corresponding time of warning concentration less than 10 seconds, recovery time was less than 30 seconds.
Do not contain any noble metal catalyst in e, the element sensitive material, have resisting sulfide, the silicide poisoning capability.
But f, element continuous operation are more than 1 year, and every performance index such as sensitivity, selectivity, response time are reliable and stable.
G, by changing the high low-resistance component ratio in the sensitive material or by changing sintering temperature, sintering time can make element resistance R in pure air
0In in a big way, adjust, to be fit to the requirement of different detection alarm complete machines.
Gas sensor provided by the invention is adapted at high temperature and contains a certain amount of ethanol, in the interference atmosphere such as smog and contain in the atmosphere of sulfide, silicide the imflammable gas actual time safety is detected.Solved that element of the same type waits to solve because of high humidity, smog, key issues such as wrong report that interference atmosphere such as ethanol cause and the failing to report of being caused of descending because of noble metal catalyst poisoning element gas sensing property.
Embodiment provided by the invention is as follows:
Embodiment 1
With γ-Fe
2O
35g, SnO
295g fully behind the mixed grinding, added the ionized water wet-milling 20-40 minute again, and this slurry evenly is coated on the spirality heater coil that platinum filament makes, and the interpolation silk that will scribble this slurry again places in the heater coil.Be separated by by pasty slurry between interpolation silk and the heater strip, the microballon formula element of making is like this toasted through about 100 ℃ be placed in the sintering furnace 550-780 ℃ of constant temperature sintering 60-90 minute.Gained gas sensor heater strip terminal voltage V
HValue is 1.8-2.5V, and interpolation silk and heater strip one end are signal end, operating voltage V≤6V.The gained gas sensor is to imflammable gas detection sensitivity height, and is strong to aqueous vapor, ethanol and smog antijamming capability.
Embodiment 2
With γ-Fe
2O
315g, SnO
280g, Al
2O
35g fully behind the mixed grinding, makes sensing element for combustible gas, and process conditions and element function characteristics are with embodiment 1.
Embodiment 3
With γ-Fe
2O
330g, SnO
249g, Al
2O
320g, MgO1g fully behind the mixed grinding, make gas sensor, and its process conditions and element function are with embodiment 1.
Embodiment 4
With γ-Fe
2O
315g, SnO
284.9g, make gas sensor behind the abundant mixed grinding of MgO0.1g, its process conditions and element function are with embodiment 1.
Claims (1)
1, a kind of Metal Oxide Semiconductor Gas Sensing element that is used for the imflammable gas detection is characterized in that the material of this gas element is formed employing γ-Fe
2O
3, SnO
2With Al
2O
3, at least a 5-30g by weight percentage, 49-95g, 0-20g, 0-1g among the MgO, make gas sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100227 CN1007193B (en) | 1988-01-18 | 1988-01-18 | Sensing element for combustible gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100227 CN1007193B (en) | 1988-01-18 | 1988-01-18 | Sensing element for combustible gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1035207A CN1035207A (en) | 1989-08-30 |
| CN1007193B true CN1007193B (en) | 1990-03-14 |
Family
ID=4831248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88100227 Expired CN1007193B (en) | 1988-01-18 | 1988-01-18 | Sensing element for combustible gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007193B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401548C (en) * | 2003-12-11 | 2008-07-09 | 上海大学 | Method for making ferric oxide/stannic oxide bilaminar membrane alcohol sensitive element |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL3027310T3 (en) * | 2013-07-31 | 2023-07-24 | Research Triangle Institute | Mixed metal iron oxides and uses thereof |
-
1988
- 1988-01-18 CN CN 88100227 patent/CN1007193B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401548C (en) * | 2003-12-11 | 2008-07-09 | 上海大学 | Method for making ferric oxide/stannic oxide bilaminar membrane alcohol sensitive element |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1035207A (en) | 1989-08-30 |
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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 | ||
| 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 |