Vulcanization-resistant silver-palladium paste for oil level sensor

Abstract

The invention discloses a vulcanization-resistant silver-palladium paste for an oil level sensor. The silver-palladium paste comprises the following components in percentage by weight: 50-65% of silver powder, 5-10% of palladium powder, 1-4% of boron-nickel solid solution powder, 5-15% of lead-free glass powder and 15-30% of an organic carrier, wherein the boron-nickel solid solution powder is prepared by smelting 60-90% of boron powder and 10-40% of nickel powder at a temperature of 2000+/-20 DEG C and then carrying out water quenching, roasting, ball milling and sieving, and the lead-free glass powder is composed of Bi2O3, CuO, Al2O3 and SiO2. According to the invention, the silver-palladium paste is printed and sintered on an aluminum oxide ceramic substrate by adopting a thick film process, the production process is simple, the repeatability is good, and the reliability and batch production of products are ensured; and on the basis that the cost is not increased, the boron-nickel solid solution is added, so that corrosion of harmful substances in the working environment to the surface of a silver-palladium conduction band is reduced, the vulcanization resistance of the silver-palladium conduction band is greatly enhanced, the working life of an oil level sensor is prolonged, and the long-term reliability of the oil level sensor is improved.

Description

technical field [0001] The invention belongs to the technical field of silver-palladium paste for sulfuration-resistant oil level sensors, and is widely used in products of oil level sensors with alumina ceramic bases and thick-film circuit technology. Background technique [0002] During the use of thick film oil level sensor products, due to long-term immersion in gasoline, the working environment is relatively harsh, which is prone to failure. The resulting output power has always been the focus of after-sales complaints, and it is also an important topic for sensor suppliers to study and improve. As the silver-palladium conductor paste used as a supporting oil level sensor, if the anti-sulfurization performance is poor, the resistance value will become larger, thereby affecting the output function of the oil level sensor. Therefore, the anti-sulfurization performance of silver-palladium conductor paste for oil level sensor is the key performance index of paste products....

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the current silver-palladium conduction band used for oil level sensor is working in a special working environment for a long time, the resistance of the conduction band becomes larger due to corrosion, the electric signal of the oil level sensor is disordered, and the oil gauge indicates wrongly.

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