Ceramic and metal brazing technology is one of the key […]
Ceramic and metal brazing technology is one of the key technologies for the development and application of cermet materials. The difficulty of ceramic and metal brazing is outlined. The technical methods and research progress of ceramic and metal brazing are expounded, and the application prospects of ceramic and metal brazing technology are prospected. Ceramic materials have excellent high temperature resistance, wear resistance, corrosion resistance, low density and good insulation.
They have broad application prospects in the fields of automobile, military, electronics and aerospace. However, the poor plasticity and high brittleness of the ceramics on the one hand cause difficulty in the processing of ceramic parts with complex shapes, and on the other hand, the ability to resist thermal stress and impact load during the individual use is determined. According to the requirements of use, an effective connection method is selected, and the ceramic and the metal are connected to obtain a ceramic-metal composite member, which can combine the advantages of the two, fully exert the excellent performance of the ceramic material and broaden the application range thereof.
Brazing is a method of joining metals to ceramics. Brazing is to use a metal material with a lower melting point than the base material as a brazing material, heating the weldment and the brazing material to a temperature higher than the melting point of the brazing material, lower than the melting temperature of the base metal, using the liquid brazing material to wet the base material, filling the joint gap and A method of interconnecting a base material to achieve a joint weldment.
Advantages of brazing: small brazing deformation, smooth and beautiful joints, suitable for welding precision, complex and components composed of different materials, such as honeycomb structural panels, turbine blades, carbide tools and printed circuit boards. Before the brazing, the workpiece must be carefully processed and strictly cleaned to remove oil and excessively thick oxide film to ensure the interface assembly gap. The gap is generally required to be between 0.01 and 0.1 mm.
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