초록

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Abstract ▼ AI-Helper

In this study, AlN powder of fine particle size and of high purity was synthesized by the carbothermal reduction-nitridation of monodisperse, spherical Al(OH)₃ which had been prepared by sol-gel method using Al(O-sec-C₄H9)₃ as the starting material. Depending on the mixing order and kinds of reducin...

In this study, AlN powder of fine particle size and of high purity was synthesized by the carbothermal reduction-nitridation of monodisperse, spherical Al(OH)₃ which had been prepared by sol-gel method using Al(O-sec-C₄H9)₃ as the starting material. Depending on the mixing order and kinds of reducing agents, the optimum condition for the preparation of AlN was determined as follows. AlN single-phase was produced by the carbothermal reduction-nitridation of (1) Benzene-washed Al(OH)₃ and the reducing agent, carbon, which was mixed in a ball mill: for 5 hours at 1400℃ under NH₃ atmosphere; (2) The mixture prepared by hydrolysis of alkoxide solution into which carbon had been dispersed beforehand: for 5 hours at 1350℃ ; (3) Al(OH)₃ Poly(furfuryl alcohol) composite powder: for 2.5 hours at 1350℃ ; (4) The mixture of Al(OH)₃ and polyacrylonitrile: for 5 hours at 1400℃. Addition of CaF₂ increased the nitridation rate when carbon or polyacrylonitrile was used as the reducing agent; but it had no effect on the nitridation rate when furfuryl alcohol was used as the reducing agent.