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| Evolution Migration Behavior and Regulation of Tungsten in Metallic Gadolinium |
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Received:November 01, 2017
Revised:November 03, 2017
Accepted:November 06, 2017
Published Online:March 20, 2018
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| DOI：doi：10.3969/j.issn.1007-7545.2018.04.015 |
| KeyWord:metal gadolinium; tungsten; evolution migration behavior; shape; regulation |
| Author | Institution |
| haozhanzhong |
包头师范学院化学学院 |
| 许林成 |
包头师范学院化学学院 |
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| Abstract: |
| The element source, shape, distribution, evolution migration behavior and regulation of W in metal gadolinium were studied via calcium thermal reduction and XRD applying GdF3 as raw materials and Ca as reductant in vacuum induction furnace. The results show that W mainly comes from crucible and exists in forms of melt state tungsten and inclusion Gd2(WO4)3. Content of W is the highest under surface of central region and is the lowest at 1/2 radius on ingot casting surface while W in metal gadolinium ingot casting appears partial poly. Evolutionary migration behavior of W is presented as two forms including shed, dissolution, migration redistribution in melt, and migration to bottom and center in cast mold, or W being oxidized to WO3 in form of Gd2(WO4)3 in melt, and migrating to bottom and center in cast mold. Gadolinium containing 0.008%W is obtained through regulating compactness of tungsten crucible, melting atmosphere, residual oxygen in furnace, purity of raw supplementary materials and regulation of temperature. |
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