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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of casting temperature and atmosphere on castability of Ni-Cr alloys: a comparative study with direct flame casting method

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Author(s):
Osvaldo Luiz Bezzon [1] ; Celso de Barros [2] ; Valéria Oliveira Pagnano [3] ; Natércia Carreira Soriani [4]
Total Authors: 4
Affiliation:
[1] University of São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prostheses - Brasil
[2] University of São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prostheses - Brasil
[3] University of São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prostheses - Brasil
[4] University of São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prostheses - Brasil
Total Affiliations: 4
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 9, n. 2, p. 237-241, 2006-06-00.
Abstract

The purpose of this study was to compare the effect of casting temperature and atmosphere on the castability of three Ni-Cr alloys against direct flame casting method. Vera Bond (VB), Vera Bond 2 (VB2) and Wiron 99 (W99) were cast at three temperatures: VB and VB2 (1310 °C, 1340 °C and 1370 °C); W99 (1400 °C, 1430 °C and 1460 °C) in atmosphere, vacuum and direct flame. Each alloy was cast in seven different conditions. Castability was assessed by the method that verifies the alloy potential to reproduce a nylon mesh. Kruskal-Wallis test demonstrated for VB, while there was no influence in the temperature range, castability was greater by vacuum (99.3%) than by direct flame (96.2%) and atmosphere (93.06%). For VB2, castability was greater at evaluated temperatures (1370 °C = 94.4%, 1340 °C = 91.15% and 1310 °C = 87.9%) than direct flame (77.8%); related vacuum (97.33%) obtained better values than atmosphere (84.6%) and direct flame. For W99, while atmosphere had no influence, castability was higher at 1460 °C (84.3%) than at other temperatures (1430 °C = 70.3%, 1400 °C = 37.05%) and direct flame (62.5%). Comparison among interactions showed that for all alloys it was possible to significantly increase the filling percentage of the mold in a comparative manner with the direct flame cast method. (AU)