The Effect of Porosity and Grain Size on the Phase Composition and Mechanical Properties of Zirconium-Dioxide-Based Ceramic

2018 ◽  
Vol 44 (8) ◽  
pp. 663-666 ◽  
Author(s):  
N. L. Savchenko ◽  
T. Yu. Sablina ◽  
I. N. Sevost’yanova ◽  
A. G. Burlachenko ◽  
S. P. Buyakova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Phase Composition ◽  
Zirconium Dioxide

scholarly journals Morphology and Mechanical Properties of 3Y-TZP Nanofiber Mats

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2097
Author(s):  
Alexander I. Tyurin ◽  
Vyacheslav V. Rodaev ◽  
Svetlana S. Razlivalova ◽  
Viktor V. Korenkov ◽  
Andrey O. Zhigachev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Phase Composition ◽  
Calcination Temperature ◽  
Tetragonal Zirconia ◽  
Calcination Temperatures ◽  
Nanoindentation Testing ◽  
Average Grain Size ◽  
Nanofiber Mats ◽  
Morphology And Mechanical Properties

The mats of yttria-stabilized tetragonal zirconia nanofibers were prepared using electrospinning. The effect of calcination temperature in the range of 600–1200 °C on their microstructure, phase composition and mechanical properties was investigated. Phase composition of the nanofibers did not change in all ranges of the calcination temperatures, while the average grain size increased from 8 to 39 nm. Nanoindentation testing of the mats showed a decrease in the hysteresis loop energy in samples with higher calcination temperature. Hardness and the elastic modulus measured with the indentation technique were the highest for the mats calcined at 900 °C.

Structural Analysis of Hydroxyapatite Sinters with Addition of ZrO2 Phase

2010 ◽  
Vol 638-642 ◽  
pp. 658-663 ◽  
Author(s):  
Agata Dudek ◽  
Zygmunt Nitkiewicz
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Phase Composition ◽  
Structural Analysis ◽  
Zirconium Dioxide ◽  
Volume Density ◽  
Ceramic Powders

A range of benefits of implants containing hydroxyapatites results, among other things, from their phase composition and degree of porosity. Poor mechanical properties of hydroxyapatite (HA) ceramics considerably limit its wider use. One of the methods for improvement of poor HA properties is addition of solid solution of Y2O3 in ZrO2. [1-8]. The investigations focused on compositions of ceramic powders based on hydroxyapatite with addition of zirconium dioxide (ZrO2 + 8%wt. Y2O3 and ZrO2 + 20%wt. Y2O3). The powders were axially compacted and then sintered at the temperature of 13000C for two hours. After the process of sintering the samples were subjected to analysis of microstructure, phase composition and geometrical measurements in order to determine volume density in each sample.

The Effect of Stoichiometry and Degree of Order on Mechanical Properties of Ni3Fe Intermetallics

2013 ◽  
Vol 747-748 ◽  
pp. 19-24 ◽  
Author(s):  
Ye Xin Chen ◽  
Hai Yan Qian ◽  
Tao Chen
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Phase Composition ◽  
Point Defects ◽  
Deformation Behavior ◽  
Disordered Alloys ◽  
Fe Intermetallics ◽  
Degree Of Order ◽  
Disordered Alloy

The effects of Fe stoichiometry and degree of order on mechanical properties of intermetallics Ni3Fe were investigated. The experimental results showed that the phase composition and the grain size of Ni3Fe alloy was independent on Fe stoichiometry. The Ni3Fe alloy with the normal stoichiometry had the lowest elongation in the ordered and disordered alloys. The tensile strength of Ni3Fe alloy depended on Fe stoichiometry of alloy. The effect of Fe stoichiometry on the mechanical properties of the ordered alloy was larger than that of disordered alloy. There were more point defects in lattice when the alloy stoichiometry deviating from the normal stoichiometry in the Ni3Fe alloy. The changes of the concentration of the point defects and degree of order altered the deformation behavior of the Ni3Fe alloy.

scholarly journals Структура и механические свойства композиционной керамики CaO-ZrO-=SUB=-2-=/SUB=--Al-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- при малых концентрациях корунда

2019 ◽  
Vol 89 (1) ◽  
pp. 107 ◽  
Author(s):  
А.А. Дмитриевский ◽  
А.О. Жигачев ◽  
Д.Г. Жигачева ◽  
А.И. Тюрин
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Phase Composition ◽  
Flexural Strength ◽  
Coefficient Of Friction ◽  
Zirconium Dioxide ◽  
Friction And Wear ◽  
Ceramic Composites ◽  
Porosity Coefficient

AbstractWe have studied the effect of the ratio between concentrations of zirconium dioxide (stabilized by CaO) and corundum on phase composition and mechanical properties of nanostructured CaO–ZrO_2–Al_2O_3 ceramic composites. The CaO–ZrO_2–Al_2O_3 composites sintered at temperatures typical of ZrO_2 are found to be characterized by the optimal microhardness/fracture toughness ratio at corundum content $${{C}_{{{\text{A}}{{{\text{l}}}_{2}}{{{\text{O}}}_{3}}}}}$$ = 5%. These composites have a high flexural strength; their porosity, coefficient of friction, and wear are typical of those for CaO–ZrO_2 ceramics.

Effect of carbon nanotubes on the microstructure and fracture resistance of nanostructured oxide ceramics

2021 ◽  
pp. 21-26
Author(s):  
Yu.A. Mirovoy ◽  
◽  
A.G. Burlachenko ◽  
A.S. Buyakov ◽  
E.S. Dedova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Grain Size ◽  
Fracture Resistance ◽  
Zirconium Dioxide ◽  
Volume Fraction ◽  
Stable State ◽  
Ceramic Composites ◽  
Plasma Sintering ◽  
Nanostructured Oxide

The structure and properties of ceramics based on zirconium dioxide stabilized yttrium oxide with the addition of high-modulus inclusions of carbon nanotubes were investigated. The composite materials were obtained by spark plasma sintering. The introduction of carbon nanotubes provides a slight decrease in the density and grain size of ceramics. Growth of volume fraction of carbon nanotubes leads to increase of mechanical properties of ceramic composites. The highest values of mechanical properties were obtained by the introduction of 5 vol.% of carbon nanotubes and were E = (246±8) GPa, H = (12.7±0.21) GPa, K 1 CI = (12.1±0.35) MPa∙m1/2, K 1 CN = (7.8±0.29) MPa∙m1/2. The increase of fracture toughness when carbon nanotubes are introduced into the ceramic matrix is caused by two dissipative mechanisms - phase transformation from tetragonal to monoclinic modification of ZrO2 and crack bridging. As the amount of introduced additive increases, the contribution of martensitic transformation in fracture resistance decreases, which is associated with a decrease in the grain size of the tetragonal zirconium dioxide phase and, accordingly, its transition to a stable state.

Phase composition and mechanical properties of a zirconium dioxide based ceramic obtained by high temperature sintering in a vacuum

1994 ◽  
Vol 32 (9-10) ◽  
pp. 839-843 ◽  
Author(s):  
N. L. Savchenko ◽  
T. Yu. Sablina ◽  
T. M. Poletika ◽  
A. S. Artish ◽  
S. N. Kul'kov
Keyword(s):  
Mechanical Properties ◽  
Phase Composition ◽  
High Temperature ◽  
Zirconium Dioxide

Synthesis of Coloured Dental Zirconia Ceramics and their Mechanical Behaviors

2014 ◽  
Vol 602-603 ◽  
pp. 594-597 ◽  
Author(s):  
Jing Li ◽  
Shi Ming Liu ◽  
Yuan Hua Lin
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Size ◽  
Phase Composition ◽  
Bending Strength ◽  
Linear Shrinkage ◽  
Zirconia Ceramic ◽  
Mechanical Behaviors ◽  
Zirconia Ceramics ◽  
Dental Zirconia Ceramics

The effects of Pr6O11 and Er2O3 dopants on microstructure and mechanical properties of zirconia ceramics were investigated. The phase composition and microstructure analysis indicate that samples are all tetragonal phase and grain size is about 50-100 nm. The relative density of zirconia ceramics was above 99.1%, linear shrinkage was nearly 20%, while Vickers hardness was over 12.5 GPa. Three-points bending strength was over 850 MPa which was slightly lower than that of the pure samples, and fracture toughness was above 4.9 MPa*m1/2. The results show that the dopants can be used to obtain the colored zirconia ceramic, and also have effects on its mechanical properties.

Surface Modification and its Influence on the Microstructure and Creep Resistance of Nickel Based Superalloy René 77 / Modyfikacja Powierzchniowa Oraz Jej Wpływ Na Mikrostrukture I Wytrzymałosc Na Pełzanie Odlewów Z Nadstopu Niklu Ren´E 77

2013 ◽  
Vol 58 (1) ◽  
pp. 95-98 ◽  
Author(s):  
M. Zielinska ◽  
J. Sieniawski
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Surface Modification ◽  
Turbine Blades ◽  
Processing Parameters ◽  
Grain Structure ◽  
Creep Tests ◽  
Cobalt Aluminate ◽  
Nickel Based Superalloy ◽  
Average Grain Size

Superalloy René 77 is very wide used for turbine blades, turbine disks of aircraft engines which work up to 1050°C. These elements are generally produced by the investment casting method. Turbine blades produced by conventional precision casting methods have coarse and inhomogeneous grain structure. Such a material often does not fulfil basic requirements, which concern mechanical properties for the stuff used in aeronautical engineering. The incorporation of controlled grain size improved mechanical properties. This control of grain size in the casting operation was accomplished by the control of processing parameters such as casting temperature, mould preheating temperature, and the use of grain nucleates in the face of the mould. For nickel and cobalt based superalloys, it was found that cobalt aluminate (CoAl2O4) has the best nucleating effect. The objective of this work was to determine the influence of the inoculant’s content (cobalt aluminate) in the surface layer of the ceramic mould on the microstructure and mechanical properties at high temperature of nickel based superalloy René 77. For this purpose, the ceramic moulds were made with different concentration of cobalt aluminate in the primary slurry was from 0 to 10% mass. in zirconium flour. Stepped and cylindrical samples were casted for microstructure and mechanical examinations. The average grain size of the matrix ( phase), was determined on the stepped samples. The influence of surface modification on the grain size of up to section thickness was considered. The microstructure investigations with the use of light microscopy and scanning electron microscopy (SEM) enable to examine the influence of the surface modification on the morphology of ’ phase and carbides precipitations. Verification of the influence of CoAl2O4 on the mechanical properties of castings were investigated on the basis of results obtained form creep tests.

MICROCAST-X MAR-M-247

Alloy Digest ◽  
1995 ◽  
Vol 44 (5) ◽  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Properties ◽  
Negative Impact ◽  
Rupture Properties

Abstract The Microcast-X process produces a substantially finer grain size that improves mechanical properties in MAR-M-247 with modest negative impact on rupture properties above 1600 F (871 C). This datasheet provides information on composition, microstructureand tensile properties as well as creep and fatigue. It also includes information on casting. Filing Code: Ni-481. Producer or source: Howmet Corporation.

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