Lanthanum zirconate ceramic toughened by ferroelastic domain switching of LaAlO3
Source abstract
Abstract
Abstract The poor fracture toughness limits the wide application of the cubic lanthanum zirconate (La2Zr2O7) ceramics. The current study reports a dramatic fracture toughness improvement of lanthanum zirconates by the introduction of lanthanum aluminates (LaAlO3), a ferroelastic second phase. A composite ceramic with the composition of x LaAlO3/ (1-x) La2Zr2O7, where x = 10, 20, 30, 40, 50 mol%, has been fabricated by a spark plasma sintering method. It is found that, the ferroelastic domains of LaAlO3 in x LaAlO3/(1-x)La2Zr2O7 composite ceramics clearly switch towards a direction that is normal to a propagating crack. In addition, the processing zone width of ferroelastic domains is found to decrease with an increase of LaAlO3 inclusion, attributing to that the residual tensile stress in LaAlO3 caused by the thermal expansion coefficient mismatch, which helps to expand the processing zone, decreases with more LaAlO3 included.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Nuclear materials and radiation effects · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (22)
Show source-provided references
1. Radiation tolerance of complex oxides10.1126/science.289.5480.748 ↗
2. Oxygen migration in A2B2O7 pyrochlores10.1016/S0167-2738(00)00836-5 ↗
3. Enhanced radiation resistance of nanocrystalline pyrochlore Gd2(Ti0.65Zr0.35)2O710.1063/1.3155855 ↗
4. Materials selection guidelines for low thermal conductivity thermal barrier coatings10.1016/S0257-8972(02)00593-5 ↗
5. Glass-like thermal conductivities in (La1-x1Yx1)2(Zr1-x2Yx2)2O7-x2 (x = x1 + x2, 0 ≤ x ≤ 1.0) solid solutions10.1016/j.actamat.2012.08.063 ↗
6. Effect of the addition of YAG (Y3Al5O12) nanopowder on the mechanical properties of lanthanum zirconate10.1016/j.msea.2007.02.003 ↗
7. La2Zr2O7 TBCs toughened by Pt particles prepared by cathode plasma electrolytic deposition, Inter
8. Effects of non-stoichiometry on the mechanical properties of Nd2-xZr2+xO7+x/2 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) ceramics10.1016/j.matlet.2014.08.065 ↗
9. Enhanced thermal expansion and fracture toughness of Sc2O3-doped Gd2Zr2O7 ceramics10.1016/j.ceramint.2015.05.008 ↗
10. The phase stability and toughening effect of 3Y-TZP dispersed in the lanthanum zirconate ceramics10.1016/j.msea.2014.03.010 ↗
11. Effects of atom- and phase- scale compressive stress on fracture toughness in yttrium-doped lanthanum zirconate solid solutions10.1016/j.ceramint.2018.01.062 ↗
12. Lanthanum zirconate ceramic toughened by BaTiO3 secondary phase10.1016/j.jallcom.2006.11.025 ↗
13. Ferroelastic domain switching toughening in spark plasma sintered t′-yttria stabilized zirconia/La2Zr2O7 composite ceramics10.1016/j.ceramint.2017.06.121 ↗
14. Dielectric and mechanical characteristics of lanthanum aluminate ceramics with strontium niobate addition10.1016/S0955-2219(03)00372-8 ↗
15. Phase diagram of the Al2O3–ZrO2–La2O3 system10.1016/j.jeurceramsoc.2005.01.014 ↗
16. On the measurement of ceramic fracture toughness using single edge notched beams10.1016/j.jeurceramsoc.2015.05.005 ↗
17. Synthesis of LaAlO3 based materials for potential use as methane-fueled solid oxide fuel cell anodes10.1016/j.ijhydene.2015.06.019 ↗
18. Toughening of a Particulate-Reinforced Ceramic-Matrix Composite by Thermal Residual Stress10.1111/j.1151-2916.1990.tb05209.x ↗
19. A.G. Evans, A.H. Heuer, D.L. Porter, The fracture toughness of ceramics, in: D.M.R. Taplin (Ed.), Proceedings of the 4th International Conference on Fracture, vol. 1, Waterloo, University of Waterloo Press, 1977.
20. The effect of binder thickness and residual stresses on the fracture toughness of cemented carbides10.1007/BF01113762 ↗
21. On a ferroelastic mechanism governing the toughness of metastable tetragonal-prime (t′) yttria-stabilized zirconia
22. Toughening of nontransformable t′-YSZ by addition of titania10.1111/j.1551-2916.2007.01990.x ↗