AgSnO2触点涂层的组织与性能

Microstructure and Properties of AgSnO2 Contact Materials Prepared by Cold Spray

摘要:

采用高能球磨方法制备Ag-SnO₂复合粉末,将球磨粉末冷喷涂到铜基板上,能够获得几毫米厚度的较致密的AgSnO₂触点涂层。850 ℃退火后涂层发生进一步致密化并且在原始粉末颗粒边界形成富银区,涂层材料硬度略为降低。电弧侵蚀和电接触试验表明,冷喷涂的AgSnO₂涂层材料具有低而稳定的接触电阻,能够满足触点的基本性能要求。

Abstract:

Cold spray was used to prepare the AgSnO₂ coating on copper substrates with high energy ball milled Ag-SnO₂ composite powders. The increased density, migration of Ag-rich phase toward the boundaries of original composite powders and decreased hardness occurred for the cold sprayed coatings during annealing at 850 ℃. It was found by the arcing and electrical contact experiments that there is low and stable contact resistance for the AgSnO₂ coating, which can be used in the low voltage apparatus.