Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1996-09-30
1998-08-25
Ryan, Patrick
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164113, 164122, 148403, 148538, B22D 4600, B22D 2704, C22C 4510, C22C 4500
Patent
active
057974438
ABSTRACT:
A casting charge of a bulk-solidifying amorphous alloy is cast into a mold from a temperature greater than its crystallized melting temperature, and permitted to solidify to form an article. The oxygen content of the casting charge is limited to an operable level, as excessively high oxygen contents produce premature crystallization during the casting operation. During melting, the casting charge is preferably heated to a temperature above a threshold temperature to eliminate heterogeneous crystallization nucleation sites within the casting charge. The casting charge may be cast from above the threshold temperature, or it may be cooled to the casting temperature of more than the crystallized melting point but not more than the threshold temperature, optionally held at this temperature for a period of time, and thereafter cast.
REFERENCES:
patent: 5225004 (1993-07-01), O'Handley et al.
patent: 5288344 (1994-02-01), Peker et al.
patent: 5368659 (1994-11-01), Peker et al.
patent: 5567251 (1996-10-01), Peker et al.
Ovid Eshbach et al., "Handbook of Engineering Fundamentals", Section 12, Heat Transfer, John Wiley & Sons, pp. 1113-1119 (1975).
Advertisement, "ProCAST . . . not just for casting", Source and date unknown.
D.E. Polk et al., "The Effect of Oxygen Additions on the Properties of Amorphous Transition Metal Alloys," in Rapidly Quenched Metals III, vol. 1, The Metals Society, pp. 220-230 (1978).
Johnson William L.
Lin Xianghong
Peker Atakan
Amorphous Technologies International
California Institute of Technology
Garmong Gregory
Lin I.-H.
Ryan Patrick
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