Composite ceramic materials as a pulverization medium and for wo

Solid material comminution or disintegration – Processes – Subjecting material to impact by moving comminuting surface

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241170, 241172, 241179, 241184, B02C 1716, B02C 1720

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active

059573988

ABSTRACT:
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 Y.sub.2 O.sub.3 and CeO.sub.2 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/mm.sup.2 or higher, and a pulverizing medium whose Vickers hardness (Hv) is 100-600 kgf/mm.sup.2 lower than that of the Vickers hardness of said at least one of the working part and the container member.

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