cBN SINTERED BODY AND TOOL MADE OF cBN SINTERED BODY
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United States of America Patent
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Issued Date -
Dec 16, 2010
app pub date -
Jan 15, 2008
filing date -
Jan 15, 2007
priority date (Note) -
Abandoned
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Abstract
A cBN sintered body excellent in chipping resistance and wear resistance in working difficult-to-machine centrifugally cast iron is provided. The present invention is directed to a cBN sintered body composed of a cBN component not lower than 50 volume % and not higher than 90 volume % or not lower than 40 volume % and not higher than 85 volume %, characterized in that the cBN sintered body contains alumina and zirconia not lower than 9 volume % and not higher than 50 volume % and a weight ratio of zirconia/alumina is not lower than 0.1 and not higher than 4. A tool including the cBN sintered body according to the present invention in a portion involved with cutting achieves improved performance in working difficult-to-machine centrifugally cast iron as compared with a conventional tool made of a cBN sintered body, because the cBN sintered body is excellent in strength, hardness and toughness.
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