Aluminum oxide ceramic electric contact structure

Abstract

The invention discloses an aluminum oxide ceramic electric contact structure. The aluminum oxide ceramic electric contact structure comprises a ceramic tube and a metal probe, wherein the metal probeis arranged at an upper end and a lower end of the ceramic tube; a convex step is arranged on an end face, connected with the ceramic tube, on the metal probe; the end face of the convex step is coated with a nickel layer, an external side face of the convex step is sleeved with a first copper ring, and an inner side face of the convex step is sleeved with a second copper ring; an upper end face and a lower end face of the ceramic tube both are provided with a metalized layer, moreover, the surface of the metalized layer is coated with a second nickel layer, ring-shaped groove cavities are arranged in the inner side faces of the upper end face and the lower end face of the ceramic tube, the ring-shaped groove cavity can accommodate the second copper ring, and the ceramic tube and the metalprobe are welded together through the first copper ring and the second copper ring. With the aluminum oxide ceramic electric contact structure provided by the invention, by improving a sealing-in mode of an electric contact, working environment temperature of the electric contact can be improved effectively, and the aluminum oxide ceramic electric contact structure has the advantages of high sealing-in strength, excellent air impermeability, high reliability, long service life and low cost, is safe and practical, and is suitable for being popularized and used.

Description

technical field [0001] The invention relates to the technical field of alumina ceramic electrical connection, in particular to an alumina ceramic electrical contact structure. Background technique [0002] Alumina ceramics is a ceramic material mainly composed of aluminum oxide, which is used for signal conversion in thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It should be noted that Wash with ultrasound. Alumina ceramics are a kind of ceramics with a wide range of uses. Because of its superior performance, it has been more and more widely used in modern society, and can meet the needs of different performances. Alumina ceramic electrical contacts generally use alumina ceramic tubes as insulating materials, high-temperature corrosion-resistant alloy steel as electrode probes, and a signal conversion component welded at high temperature. It is mainly used for measuring liquid levels in various ...

AI Technical Summary

Problems solved by technology

But its biggest disadvantage is that the porcelain seal alloy is expensive; another sealing structure is the brazing seal between alumina ceramics and stainless steel. Due to the large difference in linear expansion coefficient between stainless steel and alumina ceramics, it will cause its The sealing stress is large, resulting in low sealing strength, poor airtightness, low reliability and short service life of the sealing parts

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