Compositions: ceramic – Ceramic compositions – Refractory
Reexamination Certificate
2006-05-23
2006-05-23
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Refractory
C501S098300
Reexamination Certificate
active
07049256
ABSTRACT:
A SiAlON ceramic body made from a starting powder mixture that includes silicon nitride powder, and one or more powders that provide aluminum, oxygen, nitrogen and ytterbium to the SiAlON ceramic. The SiAlON ceramic body includes a two phase composite comprising alpha prime SiAlON phase, which is present in an amount greater than or equal to about 20 weight percent of the two phase composite, and a beta prime SiAlON phase wherein the alpha prime SiAlON phase containing ytterbium therein. The starting silicon nitride powder contains less than or equal to about 1.6 weight percent beta-silicon nitride. The ceramic body further includes an intergranular phase that includes an intergranular crystalline phase comprising at least one of YbAG and J-phase. The overall composition of the ceramic body is YbaSibAlcOdNe, wherein when a is less than 0.05, the relative intensity of the peak associated with either one or both intergranular crystalline phases of YbAG and J-phase is greater than about 2.5 of the major peak of the two-phase composite.
REFERENCES:
patent: 4127416 (1978-11-01), Lumby et al.
patent: 4563433 (1986-01-01), Yeckley et al.
patent: 4711644 (1987-12-01), Yeckley et al.
patent: 4826791 (1989-05-01), Mehrotra et al.
patent: 4880755 (1989-11-01), Mehrotra et al.
patent: 5032553 (1991-07-01), Tarry
patent: 5200374 (1993-04-01), Yamada et al.
patent: 5370716 (1994-12-01), Mehrotra et al.
patent: 5413972 (1995-05-01), Hwang et al.
patent: 5468696 (1995-11-01), Ishizawa et al.
patent: 5618768 (1997-04-01), Higuchi et al.
patent: 5648042 (1997-07-01), Miller, Jr.
patent: 5908798 (1999-06-01), Chen et al.
patent: 6064122 (2000-05-01), McConnell
patent: 6066898 (2000-05-01), Jensen
patent: 6124225 (2000-09-01), Tien et al.
patent: 6139791 (2000-10-01), Chen et al.
patent: 6198174 (2001-03-01), Nims et al.
patent: 6281595 (2001-08-01), Sinha et al.
patent: 6307278 (2001-10-01), Nims et al.
patent: 6471734 (2002-10-01), Yeckley
patent: 6693054 (2004-02-01), Yeckley
patent: 6964933 (2005-11-01), Yeckley
patent: 2004/0102305 (2004-05-01), Yeckley
patent: 2005/0189683 (2005-09-01), Yeckley
patent: 4046062 (1992-02-01), None
patent: 5-43333 (1993-02-01), None
patent: 5208870 (1993-08-01), None
patent: 6-32658 (1994-02-01), None
patent: 2966644 (1999-10-01), None
patent: 2988966 (1999-12-01), None
patent: 0002829 (2000-01-01), None
patent: WO02/44104 (2002-06-01), None
Mandal, “SiAlON Ceramics Sintered with Additions of Yb203, Dy203, and Sm203 or as Mixtures With Y203”, 8thInt'l Met. & Mat'ls Congress II, Istanbul, Turkey pp. 845-850 (1995).
Wang et al., “Preparation of R-α′-β′-SiAlONs (R=sm,Gd,Dy,Y and Yb) by Pressureless Sintering”, Journal of the European Ceramic Society, 13 (1994), pp. 461-465.
Shen et al., “Ytterbium-stabilized α-sialon Ceramics”, J. Phys. D. Appl Phys. 29 (1996) pp. 893-904.
Shue, “Microstructure and Mechanical Properties of the In Situ β-Si 3 N 4 / α′-SiAlON Composite”, J. Am. Ceramic Society 77 (1994) pp. 2345-2353.
Wittmer et al., “Economic Comparison of Continuous and Batch Sintering of Silicon Nitride”, American Ceramic Society Bulletin, vol. 72, No. 6 (Jun. 1993) pp. 129-137.
Wittmer et al., “Economic Comparison of Continuous Sintering to Batch Sintering of Si3N4”, American Ceramic Society Bulletin, vol. 70, No. 9 (1991) pp. 1519-1527.
Wittmer et al., “Continuous Sintering of Si3N4 in a controlled Atmosphere Belt Furnace”, pp. 546-562.
English Abstract of JP-4046062A, SiAlON sintered Body and Production Thereof and Gas Turbine-Blade using the Same, Jun. 1990.
English Abstract of JP-3290373A, SiAlON-based Sintered Material and Production Thereof, Apr. 1990.
English Abstract of JP-4042864A, Highly Strong SiAlON Sintered Product, Jun. 1990.
English Abstract of JP-4002664A, High-Strength SiAlON Based Sintered Compact, Apr. 1990.
Puddephatt et al., “The Periodic Table of the Elements”, Clarendon Press (1986) pp. 90-95.
Izhevskiy et al., Progress in SiAlON Ceramics, Journal of the European Ceramic Society, 20 (2000) pp. 2275-2295.
CRC Handbook of Chemistry and Physics, CRC Press (1998) pp. 4-121.
International Preliminary Examination Report in PCT Patent Application No. PCT/US01/47094 (10 pages).
Shen et al., “Reactions Occurring in Post Heat Treated α/β Sialons; On the Thermal Stability of α-Sialon”, Journal of European Ceramic Society 16 (1996) pp. 873-883.
Nordburg et al., Stability and Oxidation Properties of RE-α Sialon Ceramics (RE-Y, Sm, Yb), J. Am. Ceramic Society 81 (6) pp. 1461-1470 (1998).
Watari et al., Reaction Process and Densification Process of Mixed α′/β′ Sialon Ceramics, Journal of the European Ceramic Society 15 (1995) pp. 173-184.
Menik, et al., Quantitative Phase Analysis of Synthetic Silicon Nitride by Z-Ray Diffraction, Advances in X-Ray Analysis, vol. 23, 1979, pp. 375-379.
Group Karl
Kennametal Inc.
Prizzi John J.
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