Effect of Te content on microstructure and electrical contact properties of Ag/SnO2In2O3 electrical contact materials
Ag/SnO2In2O3 electrical contact materials with different Te contents were prepared by alloy melting-internal oxidation method.Microstructure of the Ag/SnO2In2O3 was analyzed using X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and optical microscope(OM).The electrical contact performance of rivet type contacts was tested using the JF04C contact testing system,and the transfer loss of the Ag/SnO2In2O3 electrical contact materials was analyzed.The arc erosion morphology of the dynamic and static contacts of electrical contact materials was analyzed by scanning electron microscopy(SEM),and the effect of Te addition on properties and arc burning mechanism of the materials was analyzed.The results show that the addition of Te helps to refine the grains,and as the Te content increases,the Ag/SnO2In2O3 materials form a wavy structure.The addition of Te does not affect the existing forms of Ag,SnO2 and In2O3,and the phase composition of the materials includes Ag,SnO2,In2O3,TeO2 and elemental Te.As the Te content increases,the contact resistance of the materials shows a trend of first increasing,then decreasing,and then increasing.When the Te content is 0.75％,the contact resistance is the lowest and most stable,with an average welding force of 26.6 cN,which is lower than the breaking force of 30.6 cN in conventional analog relays.The addition of Te changes the material transfer mode and reduces the appearance of splashy erosion morphology on the arc erosion surface.When the Te content is 0.75％,the"pig net oil"like network structure and"mulberry"like structure generated on the arc erosion surface significantly improve the directional transfer resistance and fusion welding resistance of the Ag/SnO2In2O3 materials in continuous high-frequency DC conditions,but excessive addition will deteriorate the contact performance.
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