Effect of far-field stresses and residual stresses incorporation in predicting fracture toughness of carbon nanotube reinforced yttria stabilized zirconia

2017 ◽  
Vol 122 (14) ◽  
pp. 145104 ◽  
Author(s):  
Neelima Mahato ◽  
Ambreen Nisar ◽  
Pratyasha Mohapatra ◽  
Siddharth Rawat ◽  
S. Ariharan ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Carbon Nanotube ◽  
Residual Stresses ◽  
Yttria Stabilized Zirconia ◽  
Far Field ◽  
Stabilized Zirconia

scholarly journals Effect of Crack Bridging on the Toughening of Ceramic/Graphene Composites

2018 ◽  
Vol 57 (1) ◽  
pp. 54-62 ◽  
Author(s):  
S.V. Bobylev ◽  
A.G. Sheinerman
Keyword(s):  
Experimental Data ◽  
Fracture Toughness ◽  
Crack Growth ◽  
Crack Deflection ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Crack Bridging ◽  
The Matrix ◽  
Graphene Content ◽  
Graphene Platelets

Abstract A model is proposed describing the effect of crack bridging on the fracture toughness of ceramic/graphene composites. The dependences of the fracture toughness on the graphene content and the sizes of the graphene platelets are calculated in the exemplary case of yttria stabilized zirconia (YSZ)/graphene composites. The calculations predict that if crack bridging prevails over crack deflection during crack growth, the maximum toughening can be achieved in the case of long graphene platelets provided that the latter do not rupture and adhere well to the matrix. The model shows good correlation with the experimental data at low graphene concentrations.

Mechanical and Structural Properties of Ion Implanted Yttria Stabiizeed Zirconia Ceramics

1983 ◽  
Vol 24 ◽  
Author(s):  
J. K. Cochran ◽  
K. O. Legg ◽  
H. F. Solnick-Legg
Keyword(s):  
Fracture Toughness ◽  
Penetration Depth ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics ◽  
Mechanical And Structural Properties ◽  
Knoop Microhardness ◽  
Vicker’S Microhardness ◽  
Reflection Electron Diffraction ◽  
Indenter Penetration

ABSTRACTSingle crystal yttria stabilized zirconia was implanted with 100 keV Ca+, Al+, and O2+ ions at fluences of 1015 to 6 × 1016 ions/cm2; . Blistering was observed at doses of 3 × 1016; O2;+ cm−2; and 6 × 1016; Al+ cm−2; but none was evident with Ca+. Knoop microhardness with a shallow indenter penetration depth peaked at a dose of 1016; ions/cm−2; for both Al+ and O2;+ but Ca+ produced no effect on microhardness. Vicker's microhardness with a much greater indenter penetration depth was not changed detectably by implantation but fracture toughness measurements from the same Vicker's indentations exhibited 10–23% increases at the highest O2+ doses and 20–25% increases at high Al+ doses. Annealing the highest implant doses at 1200° reduced the fracture toughness to pre-implant levels. Reflection electron diffraction showed that the surface had not been made amorphous by the 6 × 1016; Al+ dose as a well crystallized diffraction pattern was obtained.

Environmental Effect on the Crack Behavior of Yttria-Stabilized Zirconia During Laser Drilling

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Hong Shen ◽  
Juan Jiang ◽  
Decai Feng ◽  
Chen Xing ◽  
Xiaofeng Zhao ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Phase Transformation ◽  
Environmental Effect ◽  
Monoclinic Phase ◽  
Oxygen Vacancies ◽  
High Stress ◽  
Laser Drilling ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Crack Behavior

The crack behaviors of yttrium-stabilized zirconia during laser drilling in air, vacuum, and water environments were investigated. Due to the high stress and low fracture toughness induced by tetragonal-monoclinic phase transformation, tremendous cracks occur during drilling in air. Contrastly, cracks were reduced in vacuum drilling since the phase transformation was suppressed due to the generation of oxygen vacancies. By protection of water, no cracks were observed due to low stress and maintained fracture toughness. The crack mechanisms in different drilling media were discussed.

The Effects of Cr2O3 Addition on Fracture Toughness and Phases of ZTA Ceramic Composite

2012 ◽  
Vol 620 ◽  
pp. 35-39 ◽  
Author(s):  
Ahmad Zahirani Ahmad Azhar ◽  
Nik Akmar Rejab ◽  
Mohamad Hasmaliza ◽  
Mani Maran Ratnam ◽  
Zainal Arifin Ahmad
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Vickers Hardness ◽  
Ceramic Composite ◽  
Weight Percent ◽  
Ceramic Composites ◽  
Oxide System ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Mechanical And Physical Properties

Fracture toughness and phases of ceramic composites produced from alumina, yttria stabilized zirconia and chromia oxide system was investigated. The Cr2O3weight percent was varied from 0 wt% to 1.0 wt%. Each batch of composition was mixed, uniaxially pressed 13mm diameter and sintered at 1600 C for 4 h in pressureless conditions. Studies on on their mechanical and physical properties such as Vickers hardness and fracture toughness were carried out. Results show that an addition of 0.6 wt% of Cr2O3produces the best mechanical properties. Results of the highest fracture toughness is 4.73 MPa.m1/2,

The Effects of Silica Content and Thermal Cycles on Young’s Modulus and Residual Stresses in Yttria Stabilized Zirconia Thermal Barrier Coatings

1997 ◽  
Author(s):  
R.T.R. McGrann ◽  
E.F. Rybicki ◽  
J.R. Shadley ◽  
R.E. Sanchez ◽  
W.J. Brindley
Keyword(s):  
Residual Stresses ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Silica Content ◽  
Yttria Stabilized Zirconia ◽  
Ceramic Layer ◽  
Thermal Barrier ◽  
Stabilized Zirconia ◽  
Thermal Cycles ◽  
Plasma Sprayed

Abstract The Young's modulus of the ceramic top coat of a plasma sprayed thermal barrier coating (TBC) has been reported to vary by as much as a factor of three with changes in processing parameters and by as much as a factor of four due to prolonged thermal exposure. Since the residual stress is expected to vary directly with the modulus of the ceramic layer, it follows that a change in modulus will change the residual stresses in the ceramic layer. The objective of this study was to evaluate the modulus of plasma sprayed coatings as a function of thermal cycle exposure and silica content of the ceramic. The study employed the Cantilever Beam Bending Method to examine Young's modulus for an yttria stabilized zirconia TBC applied by plasma spraying, for zero and ten thermal cycles and for silica contents of 0.1% and 1.0%. Results are discussed in terms of mechanisms that may affect modulus and the effect of modulus variations on residual stresses.

scholarly journals Fracture toughness improvements of dental ceramic through use of yttria-stabilized zirconia (YSZ) thin-film coatings

2013 ◽  
Vol 29 (8) ◽  
pp. 881-887 ◽  
Author(s):  
Ryan N. Chan ◽  
Brian R. Stoner ◽  
Jeffrey Y. Thompson ◽  
Ronald O. Scattergood ◽  
Jeffrey R. Piascik
Keyword(s):  
Thin Film ◽  
Fracture Toughness ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Dental Ceramic ◽  
Film Coatings ◽  
Thin Film Coatings ◽  
Ysz Thin Film
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