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现今的燃油传感器要求在汽车汽油箱的苛刻的化学环境里有低的电子噪声,长的耐磨寿命和高的信号传递。虽然燃油传感器基板的设计师通过结构设计和选择触点、电刷的安装等能够较大的提高性能,但厚膜导体必须符合相关要求。导体浆料是贵重金属粉末混合物(例如Ag,Pd,Au,Pt和它们的合金、以及玻璃或氧化物粉末)悬浮于有机载体中而形成的。这些燃油传感器基板必须在包含水、酒精、有机酸、硫化合物、氟素的燃油中工作,要满足抗银离子迁移、抗化学腐蚀和耐磨性这些重要的特性。论述了一种应用于燃油传感器厚膜电路需求的导体浆料,以及工艺、机械和化学上的要求。并给出了详细的耐磨性、耐硫化及抗化学腐蚀的讨论,讨论了金属合金在导体中的作用,并用微结构分析和化学分析来评估材料。
Today’s fuel sensors require low electronic noise, long wear life and high signal transmission in the harsh chemical environment of automotive gas tanks. While designers of fuel sensor substrates can greatly improve performance through structural design and selection of contacts, brush mounting, etc., thick film conductors must meet the relevant requirements. The conductive paste is formed by suspending a mixture of precious metal powders, such as Ag, Pd, Au, Pt, and their alloys, and glass or oxide powders, in an organic vehicle. These fuel sensor substrates must work in fuels containing water, alcohol, organic acids, sulfur compounds, and fluorine to meet the important properties of silver ion migration, chemical resistance and abrasion resistance. A conductor paste for the thick film circuits of fuel sensors, as well as process, mechanical and chemical requirements, is discussed. A detailed discussion of wear resistance, sulfurization resistance and chemical resistance is given. The role of metal alloys in conductors is discussed. Microstructural and chemical analyzes are also used to evaluate the material.