Novel disc type oxygen sensor and preparation method and detection method thereof

Abstract

The invention relates to a novel disc type oxygen sensor and a preparation method and a detection method thereof. The sensor is formed by sequentially superposing an upper protection layer, a signal layer, an air reference channel layer and a heating layer from top to bottom and then sintering, wherein the air reference channel layer comprises a tape casting substrate as the fifth layer, a tape casting substrate as the sixth layer and a tape casting substrate as the seventh layer, and an air reference channel with a closed end is arranged on the surface of the tape casting substrate as the fifth layer and is totally filled with a volatile piece; the preparation method comprises the steps of preparation of a plurality of tape casting slurry, tape casting forming, edge removing and cutting, hole punching, printing, filling, superposition, vacuum sealing, warm isostatic pressing, cutting, sintering and detection. The novel disc type oxygen sensor and the preparation method and the detection method thereof have the advantages that the oxygen sensor is simple in technology and stable in performance, has high adaptability, and can work stably in high temperature.

Description

technical field [0001] The invention relates to a novel chip oxygen sensor and its preparation method and detection method, in particular to a novel chip oxygen sensor with simple process, high yield and stable product performance, its preparation method and detection method. Background technique [0002] With the promulgation of automobile exhaust emission regulations in various countries around the world, the automobile oxygen sensor is a very important sensor in modern automobiles. It is used to monitor the oxygen content or concentration in the exhaust gas discharged from the engine, and output a signal according to the measured data. The voltage is fed back to the on-board computer (ECU), and the on-board computer controls the fuel injection volume and intake air volume according to the received signal, and adjusts the gas-oil ratio (the best gas-oil ratio is 14.7:1), so as to save fuel and improve efficiency and reduce pollution. [0003] Automotive oxygen sensors are...

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Problems solved by technology

[0005] At present, the domestic chip oxygen sensor has not got rid of the long-term dependence on imports, mainly because the related manufacturing process of the domestic chip oxygen sensor is still unstable, and the consistency and stability of the product cannot be well controlled.

[0006] Invention patent CN101806768 discloses an integrated chip oxygen sensor and its manufacturing method. The method of printing volatile paste is used to manufacture the air reference channel. The disadvantages are: 1. The thickness of the printed cavity is very limited, and the thickness before sintering reaches 15 μm -50μm thick, the cavity thickness after sintering is smaller, which is not conducive to the exchange of reference channel air with the outside world; 2. The printing layer will fall off during the subsequent operation, which will affect the lamination performance of the casting sheet; 3. The printing layer comparison Crisp and loose, it is easy to deform during isostatic pressing, resulting in irregular cavity shape; 4. The printing volatile paste is wrapped between two layers, which is easy to cause cracks between layers; 5. Dip the measuring electrode end into the Pulling in the slurry of magnesia-aluminum spinel forms an integrated porous ceramic protective layer. When pulling, it is easy to cause uneven porous protective layer, which is not conducive to multiple printings;

[0007] Invention patent CN101042366A discloses a method of making a flat oxygen sensor, which is demolded and cut after casting and drying. The disadvantages are: 1. During the subsequent printing and drying process, the casting green body will deform and shrink due to the softening of PVB. It will lead to alignment deviation during overprinting, which will directly lead to an increase in the reject rate; 2. It will warp during the printing and drying process, resulting in a certain bending stress, which is not conducive to subsequent lamination; 3. After deformation, it will also cause multi-layer lamination. Alignment deviation occurs; 4. The substrate is cut into sensor sheets, intermediate sheets and heating sheets by laser cutting. The principle of this method is to burn off the organic matter in the casting sheet with high energy of the laser, but it will generate dust, and the oxygen sensor The large batches have very high requirements on cleanliness, which is not conducive to mass production

[0008] The utility model patent CN202522539U discloses a flat-plate oxygen sensor. A long groove with an open tail is cut by laser in the middle of the third layer of ceramic green sheet as a reference channel. Organic matter in the extended sheet, but it will generate dust. The large batch of oxygen sensors requires very high cleanliness, which is not conducive to mass production

After retrieving relevant documents, no technical solutions identical or similar to the present invention have been found

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