COMPOSITE POWDER HAVING MATRIX DOMAIN STRUCTURE AND NANOSIZE, WHICH HAS NO ADDITIONAL PULVERIZATION STEP

摘要

PURPOSE: Provided is nanosized composite powder, which has a matrix domain structure and balanced characteristics and is obtained with no need of an additional pulverization step. CONSTITUTION: The composite powder having a matrix domain structure comprises a matrix formed of a metal oxide, and is present in the form of three-dimensional clusters having a diameter of 250 nm or less in at least one-dimension. In the structure, each domain is formed of the metal oxide of the metal oxide matrix and/or noble metals. The domain comprises at least two metal oxides, at least two noble metals and a mixture of at least one metal oxide with at least one noble metal. The composite powder contains nanosized particles and has a surface area per unit volume of 60-1200 m2/cm3.