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Glass-based composite sealing material used in flat oxygen sensor and sealing method thereof

An oxygen sensor and composite sealing technology, which is applied in the field of oxygen sensors, can solve problems such as the application of high pressure stress and changes in motion resistance, and achieve the effect of ensuring airtightness

Active Publication Date: 2020-06-30
CHANGZHOU LAMBDA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its characteristic is that the tortuosity formed by the geometric accumulation of ceramic powder is used to achieve gas sealing, and it has excellent high-temperature structural stability. The disadvantage is that this type of sealing material needs to apply high compressive stress to maintain good airtightness, that is, Through the compression deformation of the material and the adjustment of the internal porosity, the movement resistance of the gas passing through the pores changes, which is a relative seal.

Method used

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  • Glass-based composite sealing material used in flat oxygen sensor and sealing method thereof
  • Glass-based composite sealing material used in flat oxygen sensor and sealing method thereof
  • Glass-based composite sealing material used in flat oxygen sensor and sealing method thereof

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Effect test

Embodiment 1

[0043] According to the mass proportion of each component, the glass powder is as follows:

[0044] SiO 2 : 40%-45%;

[0045] BaO: 30%-35%;

[0046] B 2 o 3 : 10%-15%;

[0047] MgO: 8%-12%.

[0048] Metal powder and glass powder are respectively 10%-30% and 70%-90% according to mass proportion. Changes in the composition of glass will affect its key parameters as a sealing material. By optimizing SiO 2 ,BaO,B 2 o 3 , the ratio of MgO and other components, so that the coefficient of thermal expansion CTE is 10×10 6 / K, the glass softening temperature is 805 oC , to meet the requirements for the use of oxygen sensor sealing materials.

Embodiment 2

[0049] Embodiment 2 of the present invention: preparation of glass-based sealing material

[0050] According to the weight ratio of Al metal powder and glass powder is 20:80, weigh the required raw materials according to the total amount of 100g. Add 300g of zirconia balls, 13-15ml of ethyl cellulose / terpineol mixed solution as solvent and 1g of herring oil as powder dispersant to the ball milling tank, and mill for 18 hours to fully disperse the raw materials to form a stable, Sealing paste with moderate viscosity. It can be used directly as a sealing slurry, or it can be used at 120 o C, after drying for 60 minutes, use it as a sealing powder.

Embodiment 3

[0051] Embodiment 3 of the present invention: method of using glass-based sealing material in oxygen sensor

[0052] The glass-based composite powder material is injected into the position of the oxygen sensor that needs to be sealed, that is, between the zirconium core of the sensor and the main body of the alumina ceramic. Pre-press 100 kPa under the action of a hydraulic press, and keep the pressure for 10 minutes to ensure that the sealing powder can enter the slot of the alumina ceramic body. press 2 oC / min heating rate to 850 oC (maximum operating temperature of the oxygen sensor). When used in the form of sealing paste, it needs to be used at 150 oC Insulate for 30 minutes to avoid the rapid volatilization of organic matter in the sealant to create holes. Metal Al is oxidized to Al 2 o 3 The compressive stress generated by the process is helpful for the wetting and bonding of the interface between the glass in the sealant and the adjacent ceramic parts at high t...

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Abstract

The invention relates to the technical field of oxygen sensors, in particular to a glass-based composite sealing material used for a flat plate type oxygen sensor, and a sealing method of the flat plate type oxygen sensor. The glass-based composite sealing material used for the flat plate type oxygen sensor is composed of metal powder and glass powder, wherein the glass powder comprises the following components in percentage by mass: 40 to 45 percent of SiO2, 30 to 35 percent of BaO, 10 to 15 percent of B2O3, and 8 to 12 percent of MgO. According to the glass-based composite sealing material used for the flat plate type oxygen sensor and the sealing method of the flat plate type oxygen sensor, the glass-based sealing material is gradually softened in a temperature rise process, pressure is generated by volume expansion in a process of oxidizing metal Al into Al2O3, and the softened glass material is plastically deformed under the action of extrusion and tightly attached to an alumina ceramic main body and a zirconia core body to form an interface bonding layer, so the air tightness of the oxygen sensor at the whole working temperature interval is ensured, and the defects of high requirement for assembly precision and process in a traditional sealing-in process of the oxygen sensor and low yield in manufacturing and packaging processes are avoided.

Description

technical field [0001] The invention relates to the technical field of oxygen sensors, in particular to a glass-based composite sealing material used in a flat oxygen sensor and a sealing method thereof. Background technique [0002] my country's automobile industry has entered a stage of rapid development, and the rapid increase of automobiles has made the awareness of exhaust pollution control an urgent problem to be solved. In the past 30 years, the carbon monoxide, hydrocarbons, and nitrogen oxides emitted by single vehicles in the United States and Japan have all dropped by more than 90%. my country has also put forward more and more stringent requirements for emission reduction and control of automobile products. It is expected that the emission control level of various automobile products will gradually be in line with international standards, and the exhaust emissions of automobiles will meet the emission standards of Euro IV and above, reducing environmental polluti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/12C04B37/00C03C8/24G01N27/407
CPCC03C8/24C04B37/003C04B2237/10C04B2237/343C04B2237/348C04B2237/76G01N27/4078
Inventor 蒲健王晓春池波李箭冯江涛
Owner CHANGZHOU LAMBDA ELECTRONICS