Research On Effect Of Additive Particle Size On The Electrical Contact Properties Of AgSnO₂ Contact Materials

Electrical contact is the core component of switch electrical appliances.And it is one of the most vulnerable parts of switch electrical appliances.If the electrical contact can not work normally,it will bring very serious consequences.AgSnO₂ is a new type of environmentally friendly contact materials.It has broad application prospects.It is most likely to replace traditional toxic contact materials-AgCdO.However,there are some defects on AgSnO₂ contact materials.First,AgSnO₂ has large contact resistance and high temperature under the effect of arc for a long period of time.Second,AgSnO₂ has poor plasticity and ductility that makes the material difficult to be machined.The production cost of AgSnO₂ is too high,which is unfavorable for promotion.Adding additives can improve the performance of AgSnO₂ contact materials.And the electrical contact properties of AgSnO₂ contact materials is related to the grain size of additives.Because of this it is necessary to study the relationship between the electricalcontact properties of AgSnO₂contact materials and the particle size.Firstly,TiO₂,La₂O₃,Bi₂O₃,CeO₂ and Fe₂O₃ were selected as additives and mixed with AgSnO₂ contact material in different proportion.And the five different sizes were determined.Secondly,Then AgSnO₂ contact materials were processed into contact by the method of powder metallurgy.The density,hardness and conductivity of the contact materials were obtained by measuring their physical properties.Then the electrical contact materials tester was used to detect the electric contact performance of AgSnO₂ contact materials.Material contact resistance,arc energy and other data were acquired.Finally,the effects of five kinds of particle sizes on the physical and electrical contact properties of the doped AgSnO₂ contact materials were analyzed.