Method for preparing high-purity superfine zirconium boride powder by high-frequency plasma

The invention relates to a method for preparing a high-purity superfine zirconium boride powder by high-frequency plasma. A superhigh temperature heat source provided by a high-frequency plasma arc provides enough high temperature and energy for synthetic reaction; the electrodeless heating characteristic of the high-frequency plasma guarantees the high-purity quality of the product; particles freely deposit and grow in an airflow to obtain superfine particles with good dispersibility; and a reactor is designed to achieve a purpose of regulating product particle size. The zirconium boride powder prepared by the method provided by the invention has the advantages of high purity, good dispersibility and nano-scale size and is suitable for preparing high-temperature ceramic and compound material. The high-frequency plasma technology has a short flow and is suitable for large-scale production.