Surface metallised ceramic and manufacturing method thereof

Abstract

The invention discloses a surface metallised ceramic and a manufacturing method thereof. The method comprises the following operation steps of immersing a metallised surface of the ceramic in an aluminium or aluminium alloy melt, making the metallised surface move with respect to the melt such that the aluminium or aluminium alloy melt wets the metallised surface of the ceramic, taking out the metallised surface of the ceramic from the melt and freely cooling the aluminium or aluminium alloy film attached to the surface, so as to obtain the ceramic with the surface connected with the aluminium or aluminium alloy film. Compared with prior art, the interface between the ceramic and the aluminium or the aluminium alloy film in the invention does not contain amorphous oxide. The aluminium or aluminium alloy crystal grains and the ceramic crystal grains are grown together. The internal organisations of the formed film are compact and do not contain oxide. The formed aluminium or aluminium alloy film has a thickness in a range from several microns to more than ten microns, is firm, and cannot easily fall off. The chessboard division peeling strength between the aluminium or the aluminium alloy film and the ceramic is proved, by experiments, to be greater than or equal to 4.1N / cm. The invention has wide application prospect in the surface metallising field of ceramic.

Description

technical field [0001] The invention relates to a surface metallized ceramic and a manufacturing method thereof. Background technique [0002] Ceramic has good thermal conductivity and insulation properties, and is a good packaging material. When used, it is generally necessary to carry out surface metallization treatment on ceramics to make circuits or solder electronic components. Traditional surface metallization methods include precious metal paste sintering method, Mo-Mn method, DBC method and active metal brazing method. Among them, the precious metal paste sintering method is to mix precious metal powder such as silver powder and glass powder, add binder, etc., prepare a slurry, coat it on the ceramic surface, and then sinter at about 900 ° C to form a surface precious metal layer; Mo-Mn method is Mix molybdenum powder and manganese oxide powder to make a slurry, coat it on the ceramic surface, and then sinter at 1500°C to form a surface metal molybdenum layer; the ...

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Problems solved by technology

However, there are also defects in the above method, that is, it is difficult to prepare thin films, especially thin films with a thickness less than 0.1 mm.

This is because the method uses a casting mold, and the casting mold must choose a material that does not react with aluminum and does not wet. If the mold gap is too small, the aluminum liquid cannot enter the casting mold, so the thin film cannot be produced.

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