CN1035207A - Sensing element for combustible gas - Google Patents
Sensing element for combustible gas Download PDFInfo
- Publication number
- CN1035207A CN1035207A CN 88100227 CN88100227A CN1035207A CN 1035207 A CN1035207 A CN 1035207A CN 88100227 CN88100227 CN 88100227 CN 88100227 A CN88100227 A CN 88100227A CN 1035207 A CN1035207 A CN 1035207A
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- CN
- China
- Prior art keywords
- gas
- sensing element
- gas sensor
- smog
- stronger
- Prior art date
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Abstract
The sensing element for combustible gas that the present invention adopts a kind of new composite oxide material system to prepare, it is stronger that its anti-aqueous vapor, ethanol and smog equal the ability of disturbing, and have H
2, CH
4, C
2H
8, C
4H
10, C
6H
12Deng imflammable gas detection sensitivity height, characteristics such as it is fast that response recovers, and long-term working stability is good.The resistance of gas sensor in pure air according to the present invention's preparation can be adjusted in a big way, and be stronger to warning complete machine adaptive capacity.
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, higher to the detection sensitivity of imflammable gas such as methane, town gas, liquefied petroleum gas, gasoline and hydrogen.
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 7.Element (relative humidity 〉=90%) in high humidity environment has good stability.Stronger to influencing factor antijamming capabilities such as ethanol, smog, insensitive to the variations in temperature in 0 ℃ of-40 ℃ of scope.The resistance R of element in pure air
0Can in a big way, adjust according to material prescription and process conditions, difference warning complete machine is had stronger adaptability.Element is to the responsive response of imflammable gas and recover very fast, and response, recovery time are all less than 20 seconds.
Gas sensor provided by the invention is adapted at high humidity and contains under the interference atmosphere such as a certain amount of ethanol and smog imflammable gas is detected in real time.
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 preparation method who is used for the Metal Oxide Semiconductor Gas Sensing element of imflammable gas detection is characterized in that 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, fully behind the mixed grinding, after 60-120 minute, be prepared into gas sensor through 550-780 ℃ of temperature sintering.
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 true CN1035207A (en) | 1989-08-30 |
| CN1007193B 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 |
|---|---|---|---|---|
| CN110280253A (en) * | 2013-07-31 | 2019-09-27 | 研究三角协会 | Mixed metal ferriferous oxide and its application |
Families Citing this family (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 |
-
1988
- 1988-01-18 CN CN 88100227 patent/CN1007193B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110280253A (en) * | 2013-07-31 | 2019-09-27 | 研究三角协会 | Mixed metal ferriferous oxide and its application |
| CN110280253B (en) * | 2013-07-31 | 2023-04-07 | 研究三角协会 | Mixed metal iron oxides and uses thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1007193B (en) | 1990-03-14 |
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| 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 |