Manufacturing Development of Tungsten Alloys for Rocket Nozzles. Technique III. Vacuum Arc Skull Casting.
WESTINGHOUSE ELECTRIC CORP BLAIRSVILLE PA
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The vacuum arc skull casting technique was evaluated as a method of producing W and W alloys for rocket nozzles. Bars of the 50 W- 50 Mo, 70 W-30 Mo, 90 W-10 Mo wt- alloys and pure W in the pressed and sintered condition were vacuum arc melted and skull cast into graphite molds in a vacuum melting facility. Destructive testing of resultant parts was conducted to determine the hardness, soundness, contamination and grain size of the castings. The first pure W skull castings ever produced were made. The ability to vacuum arc melt and cast 60- to 70- lb pure W castings was established. The vacuum arc skull casting of W-Mo alloy rocket nozzles in thin configurations may be achieved. The temperature of the W arc was calculated theoretically and confirmed in experimental melting to be in the order of 8,000 to 11,000 F. Author