A Coated Cast Iron Crucible for Use With Eutectic Al-Si Alloy in the Temperature Range 595-650 C

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The feasibility of the coated metal crucible as a container for eutectic Al--Si alloy was proven by test. Small enamel-coated east-iron pets have successfully withstood Al-- Si alloys and an oxidizing atmosphere for a period of 3 months at 725 deg C. A similarly coated east-iron crucible containing 450 pounds of eutectic Al--Si alloy was successfully tested for 144 days in a jacketing operation conducted at 595 deg to 650 deg C. Under the same conditions, the normal service life of clay-bonded graphite and silicon carbide crucibles rarely exceeds 45 days. The coating material for the iron crucible is a … continued below

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37 pages

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Yaggee, F. L. November 1, 1957.

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The feasibility of the coated metal crucible as a container for eutectic Al--Si alloy was proven by test. Small enamel-coated east-iron pets have successfully withstood Al-- Si alloys and an oxidizing atmosphere for a period of 3 months at 725 deg C. A similarly coated east-iron crucible containing 450 pounds of eutectic Al--Si alloy was successfully tested for 144 days in a jacketing operation conducted at 595 deg to 650 deg C. Under the same conditions, the normal service life of clay-bonded graphite and silicon carbide crucibles rarely exceeds 45 days. The coating material for the iron crucible is a commercially available enamel capa ble of withstanding temperatures up to 790 deg C. lt is readily applied to the surface of a variety of ferrous metals and alloys; however, best results are obtained with alloys low in chromium and nickel which also have a low thermal expansion coefficient. (auth)

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37 pages

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Decl. Feb. 4, 1960. Orig. Receipt Date: 31-DEC-60

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  • November 1, 1957

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  • Sept. 16, 2016, 12:32 a.m.

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  • Aug. 25, 2025, 11:22 p.m.

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Yaggee, F. L. A Coated Cast Iron Crucible for Use With Eutectic Al-Si Alloy in the Temperature Range 595-650 C, report, November 1, 1957; Lemont, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc868835/: accessed March 13, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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