scholarly journals Processing and properties of zirconia-toughened alumina ceramics

1994 ◽  
Vol 17 (7) ◽  
pp. 1435-1439 ◽  
Author(s):  
D S Patil ◽  
B C Mutsuddy
Keyword(s):  
Alumina Ceramics ◽  
Zirconia Toughened Alumina

Controlling Grain Size in Oxide Ceramics for Optimization of Strength and Wear Resistance

2012 ◽  
Vol 715-716 ◽  
pp. 703-710
Author(s):  
W.M. Rainforth ◽  
P. Zeng ◽  
L. Ma
Keyword(s):  
Grain Size ◽  
Sliding Wear ◽  
Second Phase ◽  
Alumina Ceramics ◽  
Size Dependent ◽  
Mild Wear ◽  
Accumulation Mechanism ◽  
Wear Transition ◽  
Magnitude Increase ◽  
Zirconia Toughened Alumina

t is well known that alumina ceramics undergo a time dependent wear transition during sliding wear. The transition, which is associated with 1-2 orders of magnitude increase in specific wear rate, involves a change from mild wear to intergranular fracture. The transition is strongly grain size dependent, with the time to the transition decreasing with grain size. However, there is a minimum grain size that can be achieved in fully dense alumina using commercially viable processing. Alternative strategies for reducing grain size and increasing toughness are through the addition of a fine second phase, with SiC and ZrO2being the most promising. The resultant composite not only has finer grain size, but also exhibits additional toughening mechanisms. This paper reports on the microstructural control in alumina, zirconia toughened alumina and alumina-silicon carbide composites. The grain size and residual stress distribution are related to the damage accumulation mechanism that occur during frictional contact, in particular the surface specific dislocation activity.

Influence of Zircon Addition on Thermal Shock Resistance of ZTA for Plasma Reactors

2007 ◽  
Vol 544-545 ◽  
pp. 379-382
Author(s):  
Kyung Hun Jang ◽  
Bum Rae Cho
Keyword(s):  
Thermal Expansion ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Sintering Temperature ◽  
Plasma Reactors ◽  
Alumina Ceramics ◽  
Low Thermal Expansion ◽  
Resultant Data ◽  
Shock Resistance ◽  
Zirconia Toughened Alumina

The effect of CaO, MgO and SiO2 as a flux on the sinterability of zirconia toughened alumina(ZTA) used for plasma reactors was investigated and the effect of zircon addition on thermal shock resistance of ZTA with 15wt.% of ZrO2 was also investigated. The resultant data revealed that ZTA shows the best sinterability at the composition of 2wt.% of CaO, 4wt.% of MgO and 2wt.% of SiO2 and at the sintering temperature of 1350°C. Thermal shock resistance of ZTA containing zircon was improved significantly. It is shown that ZTA containing 10wt.% of zircon shows better thermal shock resistance than others. This fact can be explained due to the low thermal expansion coefficient of zircon. It was concluded that zircon is an effective material to improve thermal shock resistance of alumina ceramics.

Fabrication of dense zirconia-toughened alumina ceramics through a stereolithography-based additive manufacturing

2017 ◽  
Vol 43 (1) ◽  
pp. 968-972 ◽  
Author(s):  
Haidong Wu ◽  
Wei Liu ◽  
Rongxuan He ◽  
Ziwei Wu ◽  
Qiangguo Jiang ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Alumina Ceramics ◽  
Zirconia Toughened Alumina

Quantitative XRD analysis of zirconia-toughened alumina ceramics

1987 ◽  
Vol 22 (10) ◽  
pp. 3566-3570 ◽  
Author(s):  
R. Fillit ◽  
R. P. Homerin ◽  
R. J. Schafer ◽  
R. H. Bruyas ◽  
R. F. Thevenot
Keyword(s):  
Xrd Analysis ◽  
Alumina Ceramics ◽  
Zirconia Toughened Alumina

Research on the Fracture Phenomenon of Zirconia-Toughened Alumina Ceramics under Ultrasonic Vibration

2010 ◽  
Vol 455 ◽  
pp. 156-160
Author(s):  
Yan Yan Yan ◽  
Bo Zhao ◽  
Jun Li Liu
Keyword(s):  
Ultrasonic Vibration ◽  
Surface Integrity ◽  
Normal Load ◽  
Alumina Ceramics ◽  
Ceramic Specimen ◽  
Ceramic Fracture ◽  
Propagation Behavior ◽  
Ultrasonic Vibration Assisted Grinding ◽  
Zirconia Toughened Alumina ◽  
Working Efficiency

A study of the fracture phenomenon of zirconia-toughened alumina (ZTA) ceramics was carried. It analyzes the mechanisms of crack propagation of ZTA ceramics, and constructs fracture experiments of ZTA ceramics, so the propagation behavior on fracture in ZTA ceramics was investigated according to the experiment. By contrast, intercrystalline fracture happed in V-shaped groove of ceramic specimen under normal load without ultrasonic vibration during ceramic fracture, and transcrystalline fracture happed in V-shaped groove of ceramic specimen under normal load with ultrasonic vibration during ceramic fracture. Furthermore, the loading force of ceramic specimen under normal load with ultrasonic vibration is smaller than that under normal load without ultrasonic vibration all other conditions being equal. The results of fracture experiment prove that ultrasonic vibration assisted is good for the fracture of ceramic specimen, and it also proves that ultrasonic vibration assisted grinding may raise the working efficiency and improve surface integrity of ceramics from the standpoint of the fracture.

scholarly journals Effect of micron aluminium powder on mechanical properties and microstructural in zirconia toughened alumina ceramics

2020 ◽  
Vol 15 (10) ◽  
pp. 684-687
Author(s):  
Ruihao Zhang ◽  
Bao Qi ◽  
Jie Wang ◽  
Xinwei She ◽  
Zhende Ran ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Alumina Ceramics ◽  
Aluminium Powder ◽  
Zirconia Toughened Alumina

scholarly journals Nanoscale Plasticity Behavior of Additive-Manufactured Zirconia-Toughened Alumina Ceramics during Nanoindentation

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 1006 ◽  
Author(s):  
Wenli Li ◽  
Weiwei Liu ◽  
Maoshan Li ◽  
Jianbin Nie ◽  
Yao Chen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Maximum Shear Stress ◽  
Yttria Stabilized Zirconia ◽  
Plastic Behavior ◽  
Alumina Ceramics ◽  
Deformation Bands ◽  
Stabilized Zirconia ◽  
Component Design ◽  
Zirconia Toughened Alumina ◽  
Scanning Electron

The nanoscale plasticity phenomena in zirconia-toughened alumina (ZTA) ceramics with yttria-stabilized zirconia (YSZ) addition of 10% and 30% fabricated by additive manufacturing based on a stereolithography technique were explored in detail by nanoindentation and scanning electron microscopy. It was demonstrated that the initiation of nanoscale plasticity was attributed to the combined contributions from the generation of nanoscale shear deformation bands and localized microcracking at the indentations. Such localized plastic behavior underneath the nanoindenter was interpreted by maximum shear stress analysis. The response of the phase boundary during indentation was emphasized through crack propagation paths, and optimization of alumina–YSZ adaptation through component design and SL processing was expected.

Sign in / Sign up

Export Citation Format

Share Document