Method for preparing ceramic joint with temperature detection function by utilizing rare-earth doped oxide glass

Abstract

The invention provides a method for preparing a ceramic joint with a temperature detection function by utilizing rare-earth doped oxide glass, belonging to the field of joints. The invention aims to overcome the problems of a narrow joint area and difficulty in temperature monitoring in the prior art. The method comprises the following steps: preparing a rare-earth doped oxide material by using ahydrothermal method; then mixing the rare-earth doped oxide material with oxide glass powder, and placing the obtained mixture as a composite middle layer between welded ceramic materials to form a to-be-welded part; and carrying out welding in the air. According to the invention, the glass is endowed with optical performance by the rare-earth doped oxide material; the stress of joint is effectively relieved and the joint is endowed with the temperature sensing characteristic by utilizing the adjustability of the thermal expansion coefficient of the glass and the temperature dependence characteristic of the thermal coupling energy level of rare earth ions, so joint strength is improved and temperature monitoring of the joint is realized; and the strength of the joint reaches 50-110 Mpa, and the temperature detection sensitivity of the joint can reach 0.01-0.02 K / -1. The ceramic joint is applied to the fields of aerospace, electronic devices, automobiles, the nuclear industry and the like.

Description

Technical field [0001] The invention relates to the field of joints, in particular to a method for preparing ceramic joints with temperature detection function by using rare earth doped oxide glass. Background technique [0002] Ceramic materials are widely used in aerospace, electronic devices, automotive and nuclear industries because of their high mechanical strength, good thermal stability, corrosion resistance and wear resistance. However, ceramics are highly brittle and cannot be easily processed into complex and large components, which limits its application in industry to a certain extent. Realizing reliable connection between ceramics and real-time measurement of joint temperature can effectively monitor the failure process of joints and avoid safety accidents. At present, active brazing technology is often used in the industry to connect ceramics, and the addition of active elements to the brazing filler metal promotes its wetting and spreading on the ceramic surface, ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the current ceramic joint has a large residual stress and the temperature is difficult to monitor, and provides a method based on rare earth doped glass material to enhance the performance of the ceramic joint and realize the joint temperature detection method

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