These whiskers distribute the cutting forces more

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Unformatted text preview: toughness. Particularly useful for machining nickel based alloys, cast iron and steels. The benefits of whisker-reinforced ceramics involve certain limitations. The SiC whiskers themselves have been identified as a carcinogen, and special precautions must be taken in order to manufacture this type of ceramic safely. Major Classes of Tool Materials Nickel-based alloys are commonly used in the aerospace market due to Nickel their high strength and heat resistance. This combination creates a product that is difficult to machine with conventional tooling because the material tends to work-harden during machining, which can lead to “notching” on the cutting tool and, ultimately, insert failure. Whisker-reinforced ceramics feature: • an alumina base with the addition of silicon carbide (SiC) whiskers, which have a high tensile strength that allows them to act like rebar in the alumina-based matrix. • improved notch resistance of the insert. • cutting speeds five to six times those of conventiona...
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This note was uploaded on 02/04/2014 for the course ME 3162 taught by Professor Nus during the Spring '13 term at National University of Singapore.

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