Method for preparing aluminum nitride powders
AssigneeNational Science Council
InventorsShyan-Lung Chung, Wen-Liang Yu
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Abstract
A method for preparing aluminium nitride includes a first step in which a mixture is formed of aluminium powder and ammonium halide powder. The mixture is then molded into a tablet, which is ignited in an airtight chamber containing nitrogen gas. Aluminium nitride is formed of the tablet through the combustion reaction of the tablet. The gas generated in the decomposition of the ammonium halide forms a number of channels in the tablet so as to enable nitrogen gas to enter the tablet to react with aluminium. The synthesis of aluminium nitride of high purity under low pressure is possible in view of the catalytic effect of the ammonium halide.
Claims23
A method for preparing aluminum nitride, said method comprising the steps of:
- (a) mixing an aluminum powder, an ammonium halide powder, and an aluminum nitride-compatible diluent, and forming said mixture into a densely confined structure without any catalyst;
- (b) placing the mixture having the confined structure in an atmosphere of nitrogen gas;
- and
- (c) heating the mixture until a self-combustion of the mixture is brought about.
Dependencies are inferred from the claim text.