SIALON THROW-AWAY TIP, AND CUTTING TOOL

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PROBLEM TO BE SOLVED : To provide a sialon throw-away tip which is excellent in wear resistance even in high-speed machining of a difficult-to-machine material, prevents a cutting edge from being damaged due to fusing thereto of a workpiece material, and has a long service life, and also to provide a cutting tool having the throw-away tip mounted thereon. SOLUTION : The sialon throw-away tip is made of sialon which has a sialon phase consisting of an α sialon phase and a β sialon phase, and a grain boundary phase formed of a glass phase and/or a crystal phase. The β sialon phase is represented by a chemical formula Si6-ZAlZOZN8-Z, where the Z is in a value of 0.2 to 1, and an α ratio indicating the ratio of the α sialon phase in the sialon phase is in the range of 10 to 40%. The sialon contains at least one or more rare-earth elements selected from the group consisting of Sc, Y, Dy, Yb, and Lu in an amount of 2 to 5 mol% in total in terms of oxide, and the rare-earth elements of 30 to 50 mol% exist in the α sialon phase. The cutting tools is obtained by mounting the sialon throw-away tip on a holder. COPYRIGHT : (C)2007, JPO&INPIT