Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Special medium during sintering
Patent
1994-07-06
1995-12-19
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Special medium during sintering
419 32, 419 28, 419 53, 419 54, 419 56, 419 48, 420 94, 75228, 75246, B22F 300
Patent
active
054766338
ABSTRACT:
An INVAR 36 material having long-term dimensional stability is produced by sintering a blend of powders of nickel and iron under pressure in an inert atmosphere to form an alloy containing less than 0.01 parts of carbon and less than 0.1 part aggregate and preferably 0.01 part individually of Mn, Si, P, S, and Al impurities. The sintered alloy is heat treated and slowly and uniformly cooled to form a material having a coefficient of thermal expansion of less than 1 ppm/.degree.C. and a temporal stability of less than 1 ppm/year.
REFERENCES:
patent: 5049184 (1991-09-01), Harner et al.
patent: 5310520 (1994-05-01), Jha et al.
J. Marsh, Alloys of Iron and Nickel, vol. I McGraw-Hill Book Co., 1938, 135-183.
B. S. Lement, B. L. Averbach and M. Cohen, Trans. AMS 43, 1072-1097, 1951.
G. Z. Pupke, Phys. Chem. 207, 91, 1957.
C. W. Marshall, Proc. 21st, Natl. SAMPE Symp., Los Angeles, 1976.
Physics and Application of Invar Alloys, Honda Mem. Series on Materials Science, No. 3, Maruzen Co., Ltd., Tokyo, 1978 pp. 465-549.
M. A. Hunter, Low Expansion Alloys, Metals Handbook, American Society for Metals, Cleveland, Ohio, 1948, p. 601.
Iron-Nickel Alloys for Sealing Glasses and Ceramics, MIL-I-23011, U.S. Government Printing Office, Mar. 24, 1974.
T. P. O'Donnell and W. M. Rowe Processing and Thermal Expansion Performance of Three Invar Alloys, Intl. Joint Conf. on Thermophysical Properties, 8th Thermal Expansion Symposium Proceeding, Jun. 1981.
C. W. Marshall and R. E. Maringer, Dimensional Instability, Pergamon Press, N.Y. 1977.
A. D. White, Applied Optics 6, 1138, 1967.
D. Hills and J. L. Hall, Phys. Rev. Letters 64, 1697-1700 (1990).
J. B. Berthold and S. F. Jacobs, Ultraprecise Expansion Measurements of Several Low Expansion Material, Appl. Opt. 15, (1976).
D. E. Schwab, S. T. Jacobs and S. F. Johnston, Isothermal Dimension Instabilty of Invar, 29th Natl. SAMPE Symposium, pp. 169-184, Apr. 3-5 (1984).
J. W. Berthold, S. F. Jacobs and M. A. Norton, Dimensional Stability of Fused Silica, Invar and Several Ultra-Low Thermal Expans. Matls, Metrologia, 13, 9-16 (1977).
S. F. Jacobs, Dimensional Stability of Materials Useful in Optical Engineering, Optica Acta 33, 1377-1388 (1986).
J. M. Steele, D. A. Thompson, S. F. Jacobs and D. L. Bass, Temperature and Age Effects on Temporal Stability of Invar, SPIE Proc. V1752/10, Jul. 1992 San Diego.
S. F. Jacobs Variable Invariables--Dimensional Instability with Time and Temp. SPIE, C. R. Jul. 1992, San Diego, Calif.
A. I. Zakharow, B. V. Molotilow, L. V. Pastukhowa and N. A. Solov'yeva, Fiz. Metal, Metalloved 37, No. 2, 442-444 (1974).
Hsieh Cheng H.
Lane Marc S.
O'Donnell Timothy P.
Sokolowski Witold M.
Greaves John N.
Kusmiss John H.
The United States of America as represented by the Administrator
Walsh Donald P.
LandOfFree
Ultrahigh-purity dimensionally stable INVAR 36 does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ultrahigh-purity dimensionally stable INVAR 36, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultrahigh-purity dimensionally stable INVAR 36 will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-990562