Surface metallised ceramic and manufacturing method thereof

A technology for metallization and ceramics, applied in the field of surface metallization ceramics and its manufacturing, can solve the problems of inaccessibility of molten aluminum, inability to make films, non-wetting, etc., and achieve the effect of good physical and mechanical properties

Active Publication Date: 2009-09-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Surface metallised ceramic and manufacturing method thereof
  • Surface metallised ceramic and manufacturing method thereof
  • Surface metallised ceramic and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1. Using the above-mentioned ceramic surface metallization device, put pure aluminum (99.9%) into a graphite crucible, and set an alumina ceramic plate (length 137mm, width 35mm, thickness 0.64mm, produced by Tsinghua Yueke, alumina purity greater than 95 %) is inserted into a graphite rail passing through the crucible, and then heated in a nitrogen atmosphere (nitrogen flow rate is 20 liters / min) to melt the aluminum and raise the temperature to 730°C. Insert another alumina ceramic plate into the guide rail at a speed of 68.5 mm / min from the guide rail entrance at the lower part of the device, and push the ceramic plate inserted into the guide rail to move vertically upward at the same speed. During the movement, the ceramic plate contacts the aluminum melt in the crucible through the window on the guide rail, and then pushes out from the upper part of the guide rail together with the aluminum melt adhered on the surface, and cools, forming a thickness of about 6 ...

Example Embodiment

[0031] Example 2 is the same as Example 1 except that the temperature of the melt is lowered to 700°C. With this method, a dense aluminum film with an average thickness of 7 microns is formed on the ceramic surface, and the peeling rate of the tape test is 0. The experiment was set to be repeated 3 times, and the results were the same.

Example Embodiment

[0032] Example 3 is the same as Example 1 except that the temperature of the melt is increased to 760°C. With this method, a dense aluminum film with an average thickness of 5 microns is formed on the ceramic surface, and the tape test peeling rate is 0. The experiment was set to be repeated 3 times, and the results were the same.

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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 ...

Claims

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Application Information

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IPC IPC(8): C04B41/88
Inventor 宁晓山李国才王波李莎
Owner TSINGHUA UNIV
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