M.R. Piramoon
A. Kianvash - Department of Materials Engineering, University of Tabriz

Two types of alumina-based cutting tools with compositions of ۹۰ vol.% Al۲O۳+۱۰ vol.% ZrO۲ and ۸۰ vol.% A۱۲O۳+۲۰ vol.% TiC are produced by isostatic pressing and sintering technique. The effects of these additives on the mechanical properties and cutting performance of these materials are investigated. The tool life in both materials is examined under identical conditions on cutting a grey cast Iron of grade ۱۴. At a cutting speed of ۵۵۰ m/min., a feed rate of ۰.۲۵ mm/rev., and a cutting depth of ۲ mm, the material containing TiC with an optimal tool life of ۲۷ minutes, is found to be superior to the ZrO۲ containing material which had an optimal tool life of ۲۵ minutes. The possible role of these additives on the performance of these materials are discussed.