COMPOSITE CUPROUS OXIDE POWDER

摘要

A composite cuprous oxide powder is provided comprising at least about 80% by weight of cuprous oxide particles and substantially the balance cupric oxide adhering to cuprous oxide particles. The composite cuprous oxide powder is produced by surface oxidizing cuprous oxide particles to form a black coating or layer thereon. The composite powder is produced by subjecting particles of cuprous oxide to surface oxidation at a temperature ranging from about 400 DEG F. to less than about 900 DEG F. for a time period sufficient to surface oxidize the particles of cuprous oxide and produce a black coating thereon of cupric oxide. The method is applicable to the production of black pigment grade cuprous oxide powder.