Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1970-10-09
1976-05-04
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
51309R, 264 60, 264102, 264332, B24D 306
Patent
active
039549305
ABSTRACT:
The present invention is directed to an improved cutting tool blank formed by hot pressing a mixture of finely divided high-purity alumina and from about 0.05% to 0.35% of magnesia. Up to 0.10% nickel oxide may be present. The hot pressing temperatures are effected at a temperature in the range of about 1300.degree.C to 1525.degree.C so that the crystal size of the alumina in the tool blank has an average size range from 1 to 2 microns and the pressed blank has a final product density in excess of 3.97 grams per cubic centimeter. The preferred density of the blank is in excess of 3.98 grams per cubic centimeter. The hot pressing is conducted under vacuum conditions.
REFERENCES:
patent: 3093498 (1963-06-01), Whittemore, Jr. et al.
patent: 3377176 (1968-04-01), Wolkodoff et al.
R. C. Rossi et al., "Final Stage Densification in Vacuum Hot-Pressing of Alumina", Nov., 1965, Jour. Amer. Cer. Soc., pp. 558-564.
A. G. King, "Ceramics For Cutting Metals", May, 1961, Ceramic Bulletin, pp. 395-401.
E. J. Smoke et al., "Hydrogen and Vacuum Firing", Apr., 1965, Ceramic Age, pp. 103 and 104.
Niesse John E.
Rhodes William H.
Vasilos Thomas
Avco Corporation
Hogan Charles M.
Ogman Abraham
Thurlow Jeffery R.
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