Ceramic welding device and method adopting microwave focusing method

Abstract

The invention discloses a microwave focusing method ceramic welding device and method, and relates to the technical field of microwave ceramic welding. The device comprises a single-mode resonant cavity, a cover plate and an adjustable piston structure, one side part of the single-mode resonant cavity is provided with a microwave power input port, and the side surface opposite to the direction of the microwave power input port is a concave-surface-shaped metal reflecting surface capable of reflecting microwaves and focusing the microwaves on one point; pressurizing mechanisms capable of pressurizing ceramic to be subjected to microwave welding in the single-mode resonant cavity are symmetrically mounted on the other two opposite side parts of the single-mode resonant cavity, and a vacuumizing opening is formed in the side part of the single-mode resonant cavity. The device is simple in structure, easy to control, relatively uniform in electric field and temperature distribution and stable in operation, can improve the problem that stress is generated due to non-uniform microwave field distribution, adopts the focusing reflecting surface with the ellipsoid curved surface to reflect and focus microwave beams, overcomes the defects that a traditional non-focusing device is high in microwave source power requirement and high in manufacturing cost, and improves the device reliability. The welding size of materials is improved, and the types of welding materials are increased.

Description

technical field [0001] The invention belongs to the technical field of microwave ceramic welding, in particular to a microwave focusing method ceramic welding device and a microwave focusing method ceramic welding method. Background technique [0002] The use of microwaves to weld ceramics at high temperature is a new technology that has developed rapidly this year. This welding technology has extremely high use value and broad development prospects; the ceramic material itself has good heat resistance and corrosion resistance, which makes it suitable for As a structural material in a high temperature environment, metal materials are gradually replaced. This welding technology is also widely used in industrial science and technology fields, such as aerospace, electronic information, chemical industry, and marine drilling. Because of its excellent characteristics, microwave ceramic welding technology is widely used in various fields. play an increasingly important role. [0...

AI Technical Summary

Problems solved by technology

[0004] Uniform heating is an important and key link in the ceramic welding process. It is an important prerequisite to ensure the uniform sintering of large-sized ceramic parts and complex-shaped ceramic parts. Good heating uniformity is the guarantee of welding strength. Non-uniform heating exists in microwave During the heating and sintering process, in serious cases, a huge residual stress will be generated, which will lead to the cracking of ceramic parts

The main reasons can be divided into the following categories: (1) The distribution of the microwave field is uneven, and the approximate uniform area is also extremely small, resulting in a certain internal stress that affects the welding strength; (2) The unique heating phenomenon of microwaves, such as hot spots, thermal runaway, Selective heating; (3) Problems existing in the welding material itself, such as low thermal conductivity, large size, large thermal expansion coefficient, complex structure, etc.; (4) The welding size of the welding material, the current microwave field of the microwave welding cavity The uniform area is not large; the welding strength needs to be improved, the selection of solder, the node loss and the matching with the matrix material need to be improved; the welding size of the welding material is problematic, and the uniform area of ​​the microwave field of the microwave welding cavity is not large at present; the welding strength It needs to be improved, the matching of solder selection area, node loss and matrix material needs to be improved, and the types of welding materials need to be enriched. Currently, the welding materials used are generally structural ceramics, and the use is relatively single.

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