| Autor: | Kunihiro Hisatsune, Yasuhiro Tanaka, Katsuhiro Yasuda, K. Udoh |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
chemistry.chemical_classification
Materials science Metallurgy Biomedical Engineering Biophysics Bioengineering Polymer Activation energy Indentation hardness Biomaterials Dental porcelain chemistry Electrical resistivity and conductivity Transmission electron microscopy Hardening (metallurgy) Softening |
| Zdroj: | Journal of Materials Science Materials in Medicine. 8:277-282 |
| ISSN: | 0957-4530 |
| DOI: | 10.1023/a:1018556110936 |
| Popis: | The phase transformation during continuous heating of a high carat gold alloy used for porcelain bonding was investigated by electrical resistivity measurements, hardness tests, X-ray diffraction and scanning and transmission electron microscopy. Four reaction stages (I, II, III and IV) were found. Stage I corresponded to the formation of a short-range order. A discontinuous precipitation took place in stage II, which contributed to remarkable hardening. Stages III and IV were reactions to the stable phases at each temperature region, and resulted in softening. The activation energies for stages I, II and III are 27.1, 33.8 and 58.2 kcal/mol, respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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