for si 3 no 4 Ceramic surface metallization material and preparation method and brazing process

Abstract

The invention discloses metalized materials for Si3N4 ceramic surface and a preparation method as well as brazing technique. Silver-based materials are of powder particles, which are prepared from the following components in percentage by weight: 20 to 25 percent of Cu, 3 to 5 percent of Ti, 2 to 3 percent of Ni, 0.1 to 0.3 percent of Ce, 0.2 to 0.3 percent of Sc, 0.5 to 0.6 percent of Re, and the balance of Ag; a particle size of the Ag, the Cu, the Ti and the Ni is 40 mu. m to 55 mu. m, the particle size of the Ce, Sc and Re is 15 mu. m to 25 mu. m. The silver-based materials provided by the invention are of flexible fibrous metal cloth materials, which are prepared by the pressure roller under the effect of a special adhesive; the composition of Ag-base alloy materials are uniform and the Ag-base alloy materials have a certain adhesive property; the Ag-base alloy materials are conductive to the local binding of ceramic parts in various complex parts, can ensure that the metalized materials for the Si3N4 ceramic surface do not fall off and the distribution of the surface metal is uniform under the condition of brazing, are conductive to the atomic diffusion and the interfacial reaction in a brazed connection process, can improve the wettability of the metalized materials for a surface, and are conductive to a good connection between the ceramic and a metal.

Description

technical field [0001] The present invention relates to a kind of for Si 3 N 4 The invention discloses a ceramic surface metallization material, a preparation method and a brazing process, belonging to the field of welding technology. Background technique [0002] Si 3 N 4 Ceramics have unique properties such as low density, high strength, high temperature resistance, and corrosion resistance. They are one of the most promising materials in structural ceramics. It is widely used in parts such as heat engines, internal combustion engines and heat exchangers, but the use of ceramic materials is challenged by practical problems due to their poor processability, low ductility and toughness, weak thermal shock resistance, and difficulty in manufacturing large or complex components . Realizing the reliable connection between ceramics and metals or between ceramics and ceramics has an important role and significance in developing the engineering application field of ceramics. ...

AI Technical Summary

Problems solved by technology

The internal stress problem in the connection joints, especially in the joints of ceramics and metals, due to the brittleness of ceramics, it is easy to cause cracking of ceramics under the action of internal stress, even if there is no cracking, it will lead to a significant decrease in joint strength

At present, the connection between ceramics and metals or ceramics is mainly active brazing and diffusion welding, but its performance is poor, which greatly limits its application range, and cannot make full use of the excellent performance of ceramics.