Fracture toughness, strength and creep of transparent ceramics at high temperature
Source abstract
Abstract
Fracture toughness, four-point bending strength of transparent spinel, Y2O3 and YAG ceramics in function of temperature (from room temperature up to 1500° C) were measured. Creep resistance at 1500–1550° C was studied too. Grain size distribution was determined on polished and etched surfaces of samples. Fracture surfaces after tests were examined by scanning electron microscopy. The obtained results showed that: in the case of spinel ceramics fracture toughness and strength decreased from 20 to 800° C, increased from 800 to 1200° C and decreased at higher temperature; in the case of Y2O3 ceramics they increased from 400 to 800° C, and next kept constant up to 1500° C; in the case of YAG ceramics they kept constant from 20 to 1200° C and then decreased. The creep strain rate was measured for spinel and YAG but not for Y2O3 ceramics which appeared creep resistant. The hypotheses concerning toughening and creep mechanisms were proposed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Recycling and utilization of industrial and municipal waste in materials production
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (20)
Show source-provided references
1. Transmission physics and consequences for materials selection, manufacturing and applications10.1016/j.jeurceramsoc.2008.03.025 ↗
2. Transparent alumina: a light-scattering model10.1111/j.1151-2916.2003.tb03325.x ↗
3. Fracture of polycrystalline MgAl2O410.1111/j.1151-2916.1980.tb09847.x ↗
4. High-temperature mechanical behavior of stoichiometric magnesium spinel10.1111/j.1151-2916.1995.tb08900.x ↗
5. Influence of processing conditions on the microstructure and mechanical properties of sintered yttrium oxide10.1111/j.1151-2916.1995.tb08238.x ↗
6. Mechanical properties of fully dense yttrium aluminum garnet (YAG) ceramics10.2109/jcersj2.116.649 ↗
7. High-temperature fracture toughness of duplex microstructures10.1111/j.1151-2916.1996.tb07880.x ↗
8. Strain softening and hardening during superplastic-like flow in a fine-grained MgAl2O4 spinel polycrystal10.1111/j.1551-2916.2004.01102.x ↗
9. Large tensile ductility of high purity polycrystalline yttria10.1016/1359-6454(95)00162-5 ↗
10. Creep mechanism of polycrystalline yttrium aluminum garnet10.1111/j.1151-2916.1992.tb07193.x ↗
11. Subcritical crack growth of macrocracks in alumina with R-curve behavior10.1111/j.1151-2916.1992.tb04166.x ↗
12. Calculation of stresses and strains in four-point bending creep tests10.1111/j.1151-2916.1971.tb12263.x ↗
13. Critical notch-root radius effect in SENB-S fracture toughness testing10.1016/0955-2219(95)00197-2 ↗
14. Grain size dependent alumina fracture mechanics stress intensity10.1016/S0263-4368(01)00046-4 ↗
15. Fracture of ceramics and glasses10.1016/0022-3697(87)90121-1 ↗
16. Cannon · J. Mater. Sci. · 1988 · 23 · 110.1007/BF01174028 ↗
17. Characteristic of creep deformation in ceramics10.1179/mst.1991.7.7.577 ↗
18. Self-diffusion coefficients of oxygen ion in single crystals of MgO·nAl2O3 spinels10.1063/1.1681938 ↗
19. Ytterbium cation diffusion in yttrium aluminum garnet (YAG) – implication for creep mechanisms10.1111/j.1151-2916.2001.tb01014.x ↗
20. Self-diffusion of yttrium in monocrystalline yttrium oxide: Y2O310.1016/0022-4596(80)90500-9 ↗