レーザ焼結による炭化ホウ素の小径パイプの造形
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概要
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The purpose of this research work is to fabricate small pipes consisting of boron carbide. The characteristics of boron carbide are hard and anti-corrosion. However, it is difficult to sinter the material and to obtain small pipes. Therefore, a new method is developed to fabricate pipes of boron carbide in this paper. At first, graphite powder is mixed with boron powder. And the surface of mixed powder is irradiated by a laser beam. And then, the powder is evaporated at the central portion of the laser beam. Boron carbide is produced around the central portion by the chemical reaction between the graphite powder and boron powder. Then, a small pipe consisting of boron carbide is obtained. The outer, inner diameter and length of the pipes are measured for different irradiating conditions of laser beam. The boron carbide is detected by XRD in the pipes. It is deduced that the concentration of boron carbide at the inner surface of the pipes is more than that at the other portions. Connected two or three pipes are fabricated by this method.