汽车油位传感器厚膜电阻的力学性能

摘要

Thick-film resistors of the fuel level sensor,which is the most widely used at the automotive market,were firstly analyzed after the samples were prepared.The mechanical properties of three types of thick-film resistors:C4303GCD (Ag Pa paste)、C4303M(Ag-Pa paste),5800B(Pt-Au paste) and their substrate were measured by nanoindentation.The hardness and elastic modulus of the thick-film resistors were obtained.The results show that the hardness and elastic modulus of C4303GSD track are the largest.And the lower Ag/Pa ratio is,the bigger the hardness of the track will be.The study is of significance for improving the quality of the fuel level sensor,solving the problem which the manufactures cannot measure the mechanical property of the track.It will also provide a theoretical and experimental basis for reasonable rivet-track matching,quality evaluation of new product and characteristics evaluation of thick-film resistors of the fuel level sensor.%通过对汽车市场应用最广的油位传感器核心部件厚膜电阻导带进行分析和样品准备,利用纳米压痕法对常用的三种油位传感器厚膜电阻导带:C4303GCD(银/钯导体浆料)、C4303M(银/钯导体浆料)和5800B(陶瓷铂金导体浆料)及其基片进行了力学性能测试,得到了厚膜电阻导带的硬度、弹性模量等力学特性参数.结果表明:C4303GSD型导带的硬度值和弹性模量最大,而且导带中银/钯含量比越低,导带硬度值越高.该研究对于油位传感器质量提高有着十分重要的意义,不但解决了目前生产厂家无法测出厚膜电阻导带力学性能的问题,也为新型油位传感器的触头导带的合理配对选型和性能改进,厚膜电阻导带的质量和耐磨性评价提供了重要的理论和试验依据.