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Electric insulation material for lamellar detection element of gas sensor and preparation method thereof

A gas sensor, electrical insulating material technology, applied in electrical components, material analysis by electromagnetic means, insulators, etc., can solve problems such as large side effects and poor insulation effect, and achieve good mechanical properties, reduce defects, and stable performance.

Inactive Publication Date: 2011-04-06
HEFEI ZUOTIAN ELECTRONICS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose an electrical insulating material for a chip detection element of a gas sensor and a preparation method thereof, so as to overcome the shortcomings of existing electrical insulating materials such as poor insulation effect and large side effects

Method used

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  • Electric insulation material for lamellar detection element of gas sensor and preparation method thereof
  • Electric insulation material for lamellar detection element of gas sensor and preparation method thereof
  • Electric insulation material for lamellar detection element of gas sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Preparation of an electrical insulating material of the present invention and its sintering temperature test

[0020] Weigh 10.0 grams of analytically pure α-phase Al with a particle size of 50 nm 2 o 3 and 10.0 g of analytically pure alpha-phase Al with a particle size of 10 μm 2 o 3 , add 50 ml of alcohol, use α-phase Al 2 o 3 Ball milling for 30 hours, drying at 80°C to evaporate the alcohol, grinding in an agate mortar for half an hour, and then using uniaxial dry pressing method to press the powder into a strip green body under a pressure of 300MPa. The green body is subjected to thermal analysis test in an atmospheric air atmosphere.

[0021] attached figure 1 The sintering shrinkage curves of the electrical insulating material samples prepared in this example in an air atmosphere at normal pressure are given. from figure 1It can be seen that the material starts sintering at 1200°C and reaches the maximum sintering rate at 1400°C, so the sinteri...

Embodiment 2

[0022] Embodiment 2: the test comparison of the sintering shrinkage rate of several electrical insulation materials of the present invention and existing electrical insulation materials

[0023] Table 1 below lists the sintering line shrinkage and the density of fired ceramics of ceramic green bodies with various components produced by casting method.

[0024] Table 1 Sintering line shrinkage and density of ceramic green bodies composed of several different materials

[0025]

[0026]

[0027] As can be seen from the data in the table, its sintering line shrinkage of several electrical insulating materials from numbering b to g of the present invention is similar to that of zirconia ZrO 2 The electrolyte material is very close, and there will be a good match with the electrolyte material during sintering, and the density of the fired ceramic body is relatively large. The ceramic green bodies numbered h and i are made of a single particle of 50 nanometers or 20 microns o...

Embodiment 3

[0035] Embodiment 3: The application effect of the electrical insulation material of the present invention for a chip detection element of an oxygen sensor

[0036] In order to verify the performance of the electric insulating material of the present invention for the detection element of the gas sensor, in this embodiment, the material numbered c in the foregoing embodiment 2 is used to make the chip detection element of the oxygen sensor, and various performance tests are carried out .

[0037] figure 2 It is a schematic diagram of the layered structure of a chip detection element of an oxygen sensor using an electrical insulating material of the present invention: the chip detection element includes a detection unit 1, an insulation unit 2 and a heating unit 3, and the insulation unit 2 is arranged between the detection unit 1 and the heating unit 3. Between the heating units 3 to play the role of electrical insulation; wherein the detection unit 1 is covered on the measu...

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Abstract

The invention discloses an electric insulation material for a lamellar detection element of a gas sensor and a preparation method thereof. The electric insulation material is characterized by being prepared by mixing two or more alpha-phase Al2O3 with different particle sizes, wherein one alpha-phase Al2O3 has the particle size of 20-100nm and the mass duty ratio of 40-70%, and the other one or more than one alpha-phase Al2O3 has the particle size of 2-30 micrometers and the mass duty ratio of 30-60%. When the electric insulation material is used, a solvent, a binder, a plasticizing agent and a lubricating agent are added into the electric insulation material prepared in the invention to prepare ceramic slurry, a suspending liquid or sol, which are arranged between a heating unit and a detecting unit of a gas detection element through a silk screen print method, a blade casting method, a coating method or a spraying method so as to form an insulation unit. The electric insulation material of the invention has good insulation property, good heat conduction property and strong impact resistance, is used for detecting elements, and can prolong the service life, reduce power consumption and improve mechanism property of the elements.

Description

technical field [0001] The invention belongs to the technical field of motor vehicle exhaust detection sensors, and in particular relates to an electrical insulating material for a chip detection element of the sensor and a preparation method thereof. Background technique [0002] In recent years, the emission of motor vehicle exhaust pollutants has been restricted by increasingly strict laws and regulations. In order to reduce the emission of exhaust pollutants, sensors for detecting components of exhaust gas and catalytic converters for purifying exhaust gas are generally installed on automobiles. At present, the chip detection element of the exhaust gas detection sensor is generally composed of a gas-sensitive detection unit and a heating unit co-fired with it. In order to prevent the current of the heating unit from interfering with the output signal of the detection unit, the heating unit and An electric insulation layer is set between the detection units to isolate th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/10H01B19/00G01N27/407
Inventor 左艳波
Owner HEFEI ZUOTIAN ELECTRONICS SCI & TECH
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