Cutters – for shaping – Comprising tool of specific chemical composition
Patent
1997-03-12
1999-07-13
Pitts, Andrea L.
Cutters, for shaping
Comprising tool of specific chemical composition
407118, 407120, 408144, B23B 2714
Patent
active
059217251
ABSTRACT:
Sintered silicon nitride articles for cutting tools and the like, having a high relative density, excellent wear resistance and nicking, particularly at high temperatures, and a method for preparing such articles are disclosed. The articles are made by mixing 0.25 to 3.0 vol % of magnesium oxide powder and 0.3 to 2.0 vol % of ytterbium oxide with silicon nitride starting materials, then crushing and mixing, optionally with 1.0%-vol. or less, preferably 0.5%-vol. or more of aluminum oxide powder and adding an organic binder. The article is formed using a metal press to a shape for usage as SNGN120408 tools. The sintered silicon nitride articles for tools are obtained by degasing the shaped articles, subjecting them to a primary firing at 1700 to 1900.degree. C. and 0.3 to 1.0 MPa temperature and pressure, and following with a secondary firing at a temperature which is substantially lower than the primary firing temperature, at a pressure of 100 MPa or greater.
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Kashiwagi Tetsuya
Matsubara Masaru
Pitts Andrea L.
Tsai Henry W. H.
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