The thermal shock resistance and mechanical properties at elevated temperature of transparent ceramics
Fragment książki (Rozdział w książce)
| Status: | |
| Autorzy: | Boniecki Marek, Librant Zdzisław, Sadowski Tomasz, Wesołowski Władysław |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Arkusze wydawnicze: | 0.5 |
| Język: | angielski |
| Strony: | 307 - 321 |
| Scopus® Cytowania: | 1 |
| Bazy: | Scopus |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | polski |
| In this work, the thermal shock resistance and mechanical properties at elevated temperature of transparent ceramics (spinel (MgAl2O4) and yttria (Y2O3)) were studied. The thermal shocks were done by fast inserting ceramic samples (disk shape) into a hot furnace (1000C). Vickers indentations were made on the polished sample surfaces. Before and after shocks, the measurements of crack lengths were made and next a parameter Rm (an indicator of thermal stress resistance) was obtained. Hence the maximum thermal stresses was calculated using fracture toughness KIc. The measurements of bending strength rc and KIc as a function of temperature were carried out. Young’s modulus and Vickers hardness were measured at room temperature. For spinel, fracture toughness KIc reached the maximum value at room temperature and minimum at 800C. Above this temperature, KIc increased up to 1400C. Bending strength rc attained the minimum value at 800 and 1000C. At room temperature and at 1200C it has almost the same value. For yttria, KIc and rc are higher at temperature above 600C than at room temperature and remains almost constant up to 1500C. In order to explain these observations, some hypotheses were proposed. |
