Composite ceramic materials as a pulverization medium and for working parts of a pulverizer

摘要

A pulverizer for pulverizing a product has a container and at least one working part within the container, which may contain a pulverizing medium. At least one of (1) an inner liner of the container, (2) an outer shell of the working part and (3) an outer shell of the pulverizing medium is formed from a composite ceramic material containing aluminum oxide material as a main component, and zirconium oxide material in an amount of 15-40 wt. %. At least one of Y2O3 and CeO2 is present in the zirconium oxide material in an amount of 0.1-5 mol %. A pulverizer may comprise at least one of a working part of the pulverizer and a container having a Vickers hardness (Hv) of 1300 kgf/mm2 or higher, and a pulverizing medium whose Vickers hardness (Hv) is 100-600 kgf/mm2 lower than that of the Vickers hardness of said at least one of the working part and the container member.