Specialized metallurgical processes – compositions for use therei – Processes – Producing solid particulate free metal directly from liquid...
Patent
1991-02-26
1991-11-19
Dean, R.
Specialized metallurgical processes, compositions for use therei
Processes
Producing solid particulate free metal directly from liquid...
75375, 264 05, 264 5, B22D 2308
Patent
active
050663240
ABSTRACT:
The Droplet Emulsion Technique is used to produce droplets of bulk metal or metal alloys containing inoculant particles. Heterogeneous nucleation responses are then separated and identified with variances in inoculant chemistry, size, morphology, and surface conditions in the different droplets. Differential Thermal Analysis (DTA) is used to detect and to correlate thermal signals generated from as little as 50 droplets 75-100 .mu.m in size, allowing the separation of signals generated by a minor fraction of the total droplet population. Quenching treatments are used on the samples during thermal analysis to retain the original solidification microstructures produced from effective inoculation. Differences between droplet solidification microstructures preserved from the quenching treatments allow for visual identification of effective and ineffective inoculant particles. The factors controlling effective inoculation of solid include the chemistry, morphology, crystal structure, and surface conditions of inoculant particles which are identified by using analytical x-ray and electron microbeam techniques.
REFERENCES:
patent: 4042374 (1977-08-01), Rasmussen et al.
patent: 4282034 (1981-08-01), Smith et al.
patent: 4321086 (1982-03-01), Perepezko et al.
D. Turnbull et al., "Nucleation Catalysis," Ind. Eng. Chem., vol. 44, No. 6, pp. 1292-1298, Jun. 1952.
I. Maxwell et al., "A Simple Model for Grain Refinement During Solidification," Acta Metallurgica, vol. 23, pp. 229-237.
M. M. Guzowski et al., "The Role of Boron in the Grain Refinement of Aluminum with Titanium," Met. Trans., vol. 18A, pp. 603-619, Apr. 1987.
M. I. Pope and M. D. Judd, "Differential Thermal Analysis a Guide to the Technique and its Applications," Heyden Publ., London 1977 (book), pp. 1-42.
A. Raman and K. Schubert, "Uber den Aufbau einiger zu TiAl.sub.3 verwandter Legierungsreihen," Z. Metalldke, 56, 1, pp. 44-52 (1965) (In German; see phase diagram p. 46).
H. Goldschmidt, Interstititial Alloys (book), Butterworths and Co., Ltd., 1987, pp. 331-332.
J. H. Perepezko and S. E. LeBeau, "Nucleation of Aluminum During Solidification," in Aluminum Transformation Technology and Applications-1981 ASM (Metals Park, Oh.), pp. 309-346 (1982).
J. H. Perepezko, "Nucleation Kinetics," in Principles of Solidification, pp. 101-108, 1988.
M. K. Hoffmeyer and J. H. Perepezko, "Nucleation Catalysis by Dispered Particles," Scripta Metallurgica, vol. 22, pp. 1143-1148, 1988.
Hoffmeyer Mark K.
Perepezko John H.
Dean R.
Ip Sikyin
Wisconsin Alumni Research Foundation
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