Abrasive tool making process – material – or composition – With inorganic material
Patent
1986-11-03
1987-12-08
Bell, Mark L.
Abrasive tool making process, material, or composition
With inorganic material
501 97, 501 98, C04B 3558
Patent
active
047116447
ABSTRACT:
A dual phase silicon aluminum oxynitride material comprising a first phase Si-Al-O-N, commonly referred to as .beta.--Si--Al--O--N, and a second phase Si-Al-O-N referred to as .alpha.--Si--Al--O--N. In addition to the double phase Si-Al-O-Ns, there is included a glassy type material which can formulate up to ten percent by weight of the total composition. The material may be manufactured by forming a polytype material made from reacted alumina, aluminum nitride and silicon nitride. The polytype material may be mixed with further powders of silicon nitride and an oxide of yttrium, lithium or calcium and finally reacted to a double phase Si-Al-O-N material where hardness is increased by the additional .alpha.-Si-Al-O-N is increased significantly affecting its strength.
The material may be formed in situ by mixing aluminum nitride, alumina, silicon nitride, together with an oxide of yttrium, lithium or calcium. These materials can then be sintered to a final product containing a double phase Si-Al-O-N. Control of the alumina content in the polytype or in situ methods affects the percentage of .alpha.-Si-Al-O-N produced in the final product. The hardness of the material increases with the .alpha.-Si-Al-O-N content without significantly affecting its transverse rupture strength.
REFERENCES:
patent: 4127416 (1978-11-01), Lumby et al.
patent: 4310499 (1982-01-01), Mitomo et al.
patent: 4327187 (1982-04-01), Komatsu et al.
patent: 4354990 (1982-10-01), Martinengo et al.
Jack, K. H., "Siglon Tool Materials," Towards Improved Performance of Tool Materials, Tiptom '81, The National Physical Laboratory & The Metals Society, pp. 122-125, 1981, Teddington.
Mitomo et al., "Electrical Conductivity of .alpha.-Sialon Ceramics", Journal of Materials Science 16 (1981)-Letters, pp. 552-554, 1981, Chapman & Hall Ltd.
Jack, K. H., "The Significance of Structure & Phase Equilibria in the Development of Silicon Articles and SiAlON Ceramics", Science of Ceramics, vol. 11, pp. 125-141, 1981.
Mitamo et al., "The Strength of .alpha.-Sialon Ceramics", Journal of Material Science 15 (1980)-Letters, pp. 2661-2662, 1980, Chapman & Hall Ltd.
Jack, K. H., "Phase Assemblages in Nitrogen Ceramics and Their Relationships with Properties", pp. 295-305; 1979.
Grand et al, "Composition of Stability of Y--Si--Al--O--N Solid Solutions Based on .alpha.Si.sub.3 N.sub.4 Structure", Journal of Materials Science 14(1979)-Letters, pp. 1749-1751, 1979; Chapman & Hall Ltd.
Jack, K. H., "The Role of Additives in the Densification of Nitrogen Ceramics", Second Annual & Final Technical report, Oct. 1979, European Research Office, London, England.
Jack, K. H., "The Relationship of Phase Diagrams to Research & Development of Sialons", Phase Diagrams Materials Science & Technology, vol. V, pp. 241-285, 1978, Academic Press, New York.
Jack, K. H., "The Sialons", Mat. Res. Bull., vol. 13, pp. 1327-1333, 1978, Pergram Press, Inc.
Hampshire et al., ".alpha.-Sialon Ceramics", Nature, vol. 274, pp. 330-332, Aug. 31, 1978; MacMillan Journals Ltd.
Jack, et al, "Ceramics Based on the Si--Al--O--N and Related Systems", Nature Physical Science, vol. 238, pp. 23-24, Jul. 10, 1972.
Jama et al., "The Lithia-Silicon Nitride-Aluminum System", pp. 244-308.
Jack, K. H., "Review Sialons and Related Nitrogen Ceramics", Journal of Materials Science 11 (1976), pp. 1135-1158, 1976; Chapman & Hall Ltd.
Rae et al; "The Structure of Yttrium Silicon Oxynitride and Its Role in the H-.alpha.-Pressing of Silicon Nitride with Yttria Additions", Special Ceramics 6, vol. 6, pp. 347-360, 1975; The British Ceramics Research Association.
North Bernard
Yeckley Russel L.
Bell Mark L.
Kennametal Inc.
Prizzi John J.
LandOfFree
Ceramic material and method of manufacture does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ceramic material and method of manufacture, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ceramic material and method of manufacture will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-21317