Method for producing single-phase, incongruently melting interme

Specialized metallurgical processes – compositions for use therei – Processes – Producing or purifying free metal powder or producing or...

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420 83, 420121, 420418, 148101, 148669, B22F 926

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053543548

ABSTRACT:
A method for producing single-phase intermetallic phases, which melt incongruently within a temperature range of 900.degree. to 2,000.degree. K., with a homogeneity range of .ltoreq.10 atom % at room temperature by co-reduction is described. The exothermic reaction of the calciothermal reduction is adjusted by altering the oxide content of the reaction mixture, the composition of which corresponds to the desired single-phase alloy, in such a way that the temperature condition T.sub.m >T.sub.R .gtoreq.0.9 T.sub.m (in .degree. K.) is fulfilled, T.sub.m being the melting temperature of the intermetallic phase and T.sub.R the reaction temperature. The components of the reaction mixture, with the exception of calcium, have an average particle size of .ltoreq.75 .mu.m. The reaction product at the end of the exothermic reaction is tempered at a temperature which is at least 0.7 times the melting temperature T.sub.m of the desired, single-phase alloy, measured in .degree. K., but is less than the melting temperature T.sub.m, during a period sufficient for the diffusion of the components.

REFERENCES:
patent: 3918933 (1975-11-01), Martin
patent: 4756775 (1988-07-01), Croat
patent: 4767450 (1988-08-01), Ishigaki et al.
patent: 4917724 (1990-04-01), Sharma
"Technological & Economic Aspects of Using Dy on NdFeB Magnets" by Ken Ohashi, Gorham Advanced Materials Institute, Washington, Jun. 1990.
"High coercivity in Sm2Fe17Nx magnets", by K. Schnitzke et al. pp. 2853-2855, Appl. Phys. Lett. 57(26) Dec. 24, 1990.
"Pr-Fe and Nd-Pe-based materials: A new class of high performance permanent magnets" (invited), J. Appl. Phys. 55(6) Mar. 15, 1987 J. J. Croat et al., pp. 2078-2082.
"Metallurgical Methods for the Production of Rare Earth-Transition Metal Permanent Magnet Materials", by Dr. U. Koster, pp. 438-444, MPR.
"The Current Status of Titanium Rapid Solidification" by C. Suryanarayana, pp. 22-25, JOM Mar. 1990, vol. 42, No. 3.
"Thermochemical Processing of Titanium Alloys" by F. H. Froes et al., pp. 26-29 JOM, Mar. 1990, vol. 42, No. 3.
"Melting and Casting Processes for High-Temperature Intermetallics", by Subhayu Sen et al., pp. 30-35, JOM vol. 45 No. 5, May 1991.
"Processing: Key to Enhancing the Performance of the Wonder Metal", by F. H. Froes, pp. 16-21, JOM, vol. 42, No. 3, Mar. 1990.
"Magnetic Properties of R2Fe14B single crystals", by N. C. Koon et al., pp. 4091-4093 J. Appl. Phys. 57(1) Apr. 15, 1985.
"Modern Permanent Magnets for Applications in Electro-Technology", by Karl J. Strnat, pp. 923-946, Proceeding of the IEEE, vol. 78, No. 6, Jun. 1990.
"A Family of New Cobalt-Base Permanent Magnet Materials", by K. Strnat et al., pp. 1001-1002, J. of App. Phys., vol. 38, No. 3, Mar. 1, 1967.

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