scholarly journals The influence of sodium niobate addition on sintering and properties of zirconia ceramics

2019 ◽  
Vol 486 (1) ◽  
pp. 57-60
Author(s):  
V. V. Smirnov ◽  
S. V. Smirnov ◽  
T. O. Obolkina ◽  
M. A. Goldberg ◽  
O. S. Antonova ◽  
...  
Keyword(s):  
Phase Composition ◽  
Low Temperature ◽  
Crystalline Structure ◽  
Tetragonal Phase ◽  
Sintering Temperature ◽  
High Strength ◽  
Sodium Niobate ◽  
Zirconia Ceramics ◽  
Fine Crystalline Structure ◽  
Ceramic Crowns

The study of sintering, microstructure and phase composition of zirconia ceramics containing the additive - sodium niobate. It is shown that the use of an additive helps to reduce the sintering temperature to 1,400 ° C. The obtained materials are characterized by a high content of the tetragonal phase, a fine-crystalline structure and high strength up to 440 MPa during bending. The developed low-temperature materials can be used in dentistry as ceramic crowns.

scholarly journals The influence of manganese oxide on the sintering and properties of the eutectic ceramics ZrO2-Al2O3-SiO2 system

2019 ◽  
Vol 486 (6) ◽  
pp. 675-679
Author(s):  
V. V. Smirnov ◽  
S. V. Smirnov ◽  
T. O. Obolkina ◽  
O. S. Antonova ◽  
M. A. Goldberg ◽  
...  
Keyword(s):  
Phase Composition ◽  
Manganese Oxide ◽  
Tetragonal Phase ◽  
Sintering Temperature ◽  
High Strength ◽  
Temperature Decrease ◽  
Sio2 System

The results of investigation of sintering, microstructure and phase composition of the system ZrO2-Al2O3-SiO2 with MnO admixture are shown. It was approved that the usage of MnO admixture promoted sintering temperature decrease up to 1250-1350 °C. The product obtained is characterized by a high content of tetragonal phase as well as high strength while bending.

scholarly journals Low-temperature degradation resistance and plastic deformation of ATZ ceramics stabilized by CaO

2021 ◽  
Vol 2103 (1) ◽  
pp. 012075
Author(s):  
AA Dmitrievskiy ◽  
DG Zhigacheva ◽  
VM Vasyukov ◽  
PN Ovchinnikov
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Plastic Deformation ◽  
Compressive Strength ◽  
Phase Composition ◽  
Low Temperature ◽  
Uniaxial Compression ◽  
Calcium Oxide ◽  
Tetragonal Phase ◽  
Room Temperature

Abstract In this work, the phase composition (relative fractions of monoclinic m-ZrO2, tetragonal t-ZrO2, and cubic c-ZrO2 phases) and mechanical properties (hardness, fracture toughness, compressive strength) of alumina toughened zirconia (ATZ) ceramics, with an addition of silica were investigated. Calcium oxide was used as a stabilizer for the zirconia tetragonal phase. It was shown that CaO-ATZ+SiO2 ceramics demonstrate increased resistance to low-temperature degradation. The plasticity signs at room temperature were found due to the SiO2 addition to CaO-ATZ ceramics. A yield plateau appears in the uniaxial compression diagram at 5 mol. % SiO2 concentration. It is hypothesized that discovered plasticity is due to the increased t→m transformability.

scholarly journals Sintering and properties of dioxide of ceramics containing the sodium silicate additive

2019 ◽  
Vol 488 (1) ◽  
pp. 36-39
Author(s):  
V. V. Smirnov ◽  
S. V. Smirnov ◽  
T. O. Obolkina ◽  
O. S. Antonova ◽  
M. A. Goldberg ◽  
...  
Keyword(s):  
Phase Composition ◽  
Low Temperature ◽  
Flexural Strength ◽  
Sodium Silicate ◽  
Nanocrystalline Materials ◽  
Zirconium Dioxide ◽  
Crystal Size ◽  
Sintering Temperature ◽  
Sintering Additive ◽  
Stabilized Zirconium Dioxide

The dependences of the formation of the microstructure and the phase composition of ceramics based on partially stabilized zirconium dioxide on the sintering temperature and the content of the sintering additive are established. It is shown that the introduction of an additive, which forms a low-temperature melt based on sodium silicate - Na2SiO3, leads to a decrease in the sintering temperature by 200 °C. As a result of the work, were obtained dense nanocrystalline materials with a crystal size of 100-200 nm, flexural strength up to 600 MPa and a sintering temperature of 1200-1250 °C. 

scholarly journals Evidence of Phase Transitions and Their Role in the Transient Behavior of Mechanical Properties and Low Temperature Degradation of 3Y-TZP Made from Stabilizer-Coated Powder

Ceramics ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 271-285 ◽  
Author(s):  
Frank Kern
Keyword(s):  
Low Temperature ◽  
Tetragonal Phase ◽  
Sintering Temperature ◽  
Domain Size ◽  
Transient Behavior ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Fine Grain ◽  
Yttria Content ◽  
Temperature Ageing

The substance 3 mol% yttria stabilized zirconia (3Y-TZP) has become a commodity for the manufacture of components in biomedical and engineering applications. Materials made from stabilizer-coated rather than co-precipitated starting powders are known for their superior toughness and low temperature ageing resistance. The reason for this phenomenon is however still not fully understood. In this study, 3Y-TZP materials hot pressed at 1300–1450 °C for 1 h were characterized. It was found that at a sintering temperature of 1375 °C, a transition from fine grain to coarse grain microstructure associated with a shift from tough and ageing resistant to brittle and prone to ageing was observed. The detailed analysis of the phase composition by X-ray diffraction revealed that TZPs consists of up to five crystallographically different phases of zirconia simultaneously whose contents dynamically change with sintering temperature. At low sintering temperature, the predominant phases are a tetragonal phase with low yttria content and large domain size and high tetragonality together with a cubic phase of high yttria content. At high temperature, a tetragonal phase of higher yttria content and lower tetragonality is formed together with a cubic phase of lower yttria content.

The Patterns of Phase Composition and Properties of High-Calcium Low-Density Ceramics Formation Based on Argillous Raw Materials of Various Chemical and Mineralogical Composition

2021 ◽  
Vol 1037 ◽  
pp. 167-173
Author(s):  
Natalia Yatsenko ◽  
Aleksandr I. Yatsenko ◽  
Natalia A. Vil'bitskaya ◽  
Olga I. Sazonova ◽  
Rimma V. Savanchuk
Keyword(s):  
Phase Composition ◽  
Low Temperature ◽  
Raw Materials ◽  
High Strength ◽  
Mineralogical Composition ◽  
Strength Properties ◽  
Low Density ◽  
High Calcium ◽  
Sintering Properties ◽  
Alkaline Oxides

The post-sintering properties of walling high-calcium ceramics based on clay-containing raw materials in low-temperature roasting depend on the chemical-mineralogical composition of clay with different contents of iron, calcium-containing and alkaline oxides that contribute to the formation of new crystalline phases, which provide for the production of low-density ceramic material with high-strength properties.

Design of Glass-Ceramic Matrix by Modification of Microstructure for High Strength LTCC Application

2007 ◽  
Vol 544-545 ◽  
pp. 541-544
Author(s):  
Jin Ho Kim ◽  
Seong Jin Hwang ◽  
Hyung Sun Kim
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Low Temperature ◽  
Glass Ceramic ◽  
Sintering Temperature ◽  
High Strength ◽  
Ceramic Matrix ◽  
Glass Frit ◽  
Sintered Body ◽  
Crystal Phases

For low temperature co-fired ceramics (LTCC) materials, BaO-B2O3-MgO-Al2O3 glass system was tested. The starting temperature for densification of a sintered body was at 700°C and the onset temperature for crystallization of a sintered body was 820°C. With the sintering temperature, the sintered body was investigated with shrinkage, crystal phases, thermal properties, and mechanical properties. The glass transition temperature was constant with increasing frit size. However, the onset point of crystallization increased with increasing frit size. The formation of crystal phase was celsian (BaAl2Si2O8). From our results, it is possible to achieve the glass-ceramic having the high strength and the ability of sintering at low temperature using controlling the sintering temperature of BaO-B2O3-MgO-Al2O3 system glass frit.

Effect of spark plasma sintering temperature on structure and phase composition of Ti-Al-Nb-based alloys

2017 ◽  
Vol 59 (11-12) ◽  
pp. 1033-1036 ◽  
Author(s):  
Sherzod Kurbanbekov ◽  
Mazhyn Skakov ◽  
Viktor Baklanov ◽  
Batyrzhan Karakozov
Keyword(s):  
Phase Composition ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Plasma Sintering ◽  
Spark Plasma

COPPER ALLOY No. 510

Alloy Digest ◽  
1971 ◽  
Vol 20 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Low Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Fatigue Properties ◽  
Temperature Performance ◽  
Tin Bronze

Abstract COPPER ALLOY No. 510 is a tin bronze containing about 0.25% phosphorus. It combines high strength and toughness with excellent fatigue properties. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep and fatigue. It also includes information on low temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-238. Producer or source: Brass mills.

AMPCOLOY 495

Alloy Digest ◽  
1966 ◽  
Vol 15 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Low Temperature ◽  
Physical Properties ◽  
High Strength ◽  
Heat Treating ◽  
Aluminum Bronze ◽  
High Manganese ◽  
Temperature Performance

Abstract AMPCOLOY 495 is a high manganese type of aluminum bronze recommended where high strength and corrosion resistance are required along with good weldability. It is recommended for marine equipment and ship propellers. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness, creep, and fatigue. It also includes information on low temperature performance and corrosion resistance as well as casting, forming, heat treating, machining, and joining. Filing Code: Cu-171. Producer or source: Ampco Metal Inc..

CRUCIBLE D6

Alloy Digest ◽  
1962 ◽  
Vol 11 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Low Temperature ◽  
High Strength Steel ◽  
High Strength ◽  
Heat Treating ◽  
Steel Company ◽  
Temperature Performance ◽  
Ultra High Strength Steel ◽  
Crucible Steel

Abstract Crucible D6 is a low alloy ultra-high strength steel developed for aircraft-missile applications and primarily designed for use in the 260,000-290,000 psi tensile strength range. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on low temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-129. Producer or source: Crucible Steel Company of America.

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