LABORATORY EVALUATION OF GRAPHITE CRUCIBLE COATINGS FOR VACUUM MELTING URANIUM

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Oxide and carbide coatings and methods of applying them to graphite crucibles were evaluated on a laboratory scale. The objectives were to find a better crucible and mold coating than magnesia (Mgo), which is currently used in the remelt operation, and a better method of application than brushing. The evaluation consisted of the vacuum-melting of slug uranium charges and derby having different coatings, followed by studies of the appearance of the coatings and the metal quality (impurity levels) of the products. Flame-sprayed magnesium zirconate (MgZro/sub 3/) was determined to be the best coating evaluated. It limited the average carbon pickup ... continued below

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Magoteaux, O.R.; Elston, D.L. & Hall, C.F. October 24, 1958.

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Description

Oxide and carbide coatings and methods of applying them to graphite crucibles were evaluated on a laboratory scale. The objectives were to find a better crucible and mold coating than magnesia (Mgo), which is currently used in the remelt operation, and a better method of application than brushing. The evaluation consisted of the vacuum-melting of slug uranium charges and derby having different coatings, followed by studies of the appearance of the coatings and the metal quality (impurity levels) of the products. Flame-sprayed magnesium zirconate (MgZro/sub 3/) was determined to be the best coating evaluated. It limited the average carbon pickup to 73 ppm for derby uranium charges; with slug uranium, no pickup occurred. The flame-spray method provided a uniform coating thickness and virtually eliminated moisture and volatiles in the coatings. Studies showed that the flamesprayed magnesium zirconate contains a very small amount of volatiles and is not hygroscopic, but that 2500 deg F it is reduced slightly by graphite and co is released. (auth)

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  • Other Information: Orig. Receipt Date: 31-DEC-59

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  • Report No.: NLCO-759
  • Grant Number: AT(30-1)-1156
  • DOI: 10.2172/4267926 | External Link
  • Office of Scientific & Technical Information Report Number: 4267926
  • Archival Resource Key: ark:/67531/metadc1026597

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Office of Scientific & Technical Information Technical Reports

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  • October 24, 1958

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  • Oct. 15, 2017, 10:09 p.m.

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Magoteaux, O.R.; Elston, D.L. & Hall, C.F. LABORATORY EVALUATION OF GRAPHITE CRUCIBLE COATINGS FOR VACUUM MELTING URANIUM, report, October 24, 1958; United States. (digital.library.unt.edu/ark:/67531/metadc1026597/: accessed April 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.