Mechanically Ground Powders of β-Rhombohedral Boron: Structure and Properties

Abstract

The paper analyzes and summarizes the studies focusing on the structure and the mechanical, chemical, and process properties of size-classified β-rhombohedral boron powders produced by mechanical grinding. The influence of certain factors of grinding on some characteristics (pycnometric and bulk densities, flowability, amplitude of EPR signals, and chemical activity) is evaluated. Methods for removal of impurities from ground powders, storage, and XRD testing of fine fractions are proposed. The research results are used to develop a flow chart to produce β-rhombohedral boron powders of different particle sizes with stable structure and physical and process characteristics. It is established that individual powder fractions can be used as additions to abrasive diamond micropowders and for the formation of neutron-absorbing coatings on various materials and articles.