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. 

Low temperature sintering of nano-SiC using a novel Al8B4C7 additive

2010 ◽  
Vol 25 (3) ◽  
pp. 471-475 ◽  
Author(s):  
Sea-Hoon Lee ◽  
Byung-Nam Kim ◽  
Hidehiko Tanaka
Keyword(s):  
Grain Size ◽  
Liquid Phase ◽  
Low Temperature ◽  
Sintering Temperature ◽  
Applied Pressure ◽  
Liquid Phase Sintering ◽  
Low Temperature Sintering ◽  
Densification Rate ◽  
Sintering Additive ◽  
Average Grain Size

Al8B4C7 was used as a sintering additive for the densification of nano-SiC powder. The average grain size was approximately 70 nm after sintering SiC-12.5wt% Al8B4C7 at 1550 °C. The densification rate strongly depended on the sintering temperature and the applied pressure. The rearrangement of SiC particles occurred at the initial shrinkage, while viscous flow and liquid phase sintering became important at the middle and final stage of densification.

Effect of Mineral Composition and Sintering Temperature on the Synthetic Cordierite

2014 ◽  
Vol 633 ◽  
pp. 61-64
Author(s):  
Lei Li ◽  
Rui Long Wen ◽  
Xiao Guang Zhang ◽  
Cheng Biao Wang ◽  
Ming Hao Fang ◽  
...  
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Flexural Strength ◽  
Mineral Composition ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Temperature Reaction ◽  
Final Phase ◽  
High Temperature Reaction ◽  
Industrial Alumina

Cordierite samples were prepared using quartz sand tailings, industrial alumina and magnesite tailings as raw materials by high-temperature reaction. The influence of mineral composition and sintering temperature on the final phase composition and physical properties of cordierite were studied. The results shown that a large number of cordierite generated at 1300 °C. When the ratio of Al2O3/SiO2 equals to 1.08, the flexural strength of samples increased to 27.66 MPa.

Effect of Y2O3 on the Sintering, Mechanical and Dielectric Properties of Mullite/h-BN Composites

2016 ◽  
Vol 848 ◽  
pp. 28-31
Author(s):  
Han Jin ◽  
Yong Feng Li ◽  
Zhong Qi Shi ◽  
Hong Yan Xia ◽  
Guan Jun Qiao
Keyword(s):  
Fracture Toughness ◽  
Dielectric Constant ◽  
Phase Composition ◽  
High Temperature ◽  
Dielectric Properties ◽  
Liquid Phase ◽  
Flexural Strength ◽  
Sintering Temperature ◽  
Pressureless Sintering ◽  
Different Temperatures

Mullite/10 wt. %h-BN composites with 5 wt. % Y2O3 additive were fabricated by pressureless sintering at different temperatures. The densification, phase composition, microstructure, mechanical and dielectric properties of the mullite/h-BN composites were investigated. With the addition of Y2O3, the sintering temperature of the mullite/h-BN composites declined, while the density, mechanical and dielectric properties all increased. The addition of Y2O3 promoted the formation of liquid phase at high temperature, which accelerated the densification. Besides, Y2O3 particles which were located at the grain boundaries inhibited the grain growth of mullite matrix. For the mullite/h-BN composites with Y2O3 additive, the appropriate sintering temperature was about 1600°C. The relative density, flexural strength, fracture toughness and dielectric constant of the Y2O3 doped mullite/h-BN composite sintered at 1600 °C reached 82%, 135 MPa, 2.3 MPa·m1/2 and 4.9, respectively.

Effect of Iron Additive on the Sintering Behavior of Hot-Pressed ZrC-W Composites

2008 ◽  
Vol 368-372 ◽  
pp. 1764-1766 ◽  
Author(s):  
Yu Jin Wang ◽  
Lei Chen ◽  
Tai Quan Zhang ◽  
Yu Zhou
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Relative Density ◽  
Sintering Temperature ◽  
Sintering Behavior ◽  
Hot Press ◽  
Sintering Additive ◽  
Microstructure And Mechanical Properties ◽  
Hot Press Sintering

The ZrC-W composites with iron as sintering additive were fabricated by hot-press sintering. The densification, microstructure and mechanical properties of the composites were investigated. The incorporation of Fe beneficially promotes the densification of ZrC-W composites. The relative density of the composite sintered at 1900°C can attain 95.3%. W2C phase is also found in the ZrC-W composite sintered at 1700°C. The content of W2C decreases with the increase of sintering temperature. However, W2C phase is not identified in the composite sintered at 1900°C. The flexural strength and fracture toughness of the composites are strongly dependent on sintering temperature. The flexural strength and fracture toughness of ZrC-W composite sintered at optimized temperature of 1800°C are 438 MPa and 3.99 MPa·m1/2, respectively.

Properties of ceramics obtained on the basis of powders of a mechanical mixture of zirconium hydroxide and dopant

2019 ◽  
pp. 44-48
Author(s):  
Yu. I. Komolikov ◽  
I. D. Kashcheev ◽  
V. I. Pudov
Keyword(s):  
Thermal Decomposition ◽  
Phase Composition ◽  
Flexural Strength ◽  
Specific Surface ◽  
Zirconium Dioxide ◽  
High Strength ◽  
Zirconium Hydroxide ◽  
Mechanical Mixture ◽  
Ceramic Samples ◽  
Structure Phase

The results of studies of the structure, phase composition and specific surface of powders based on zirconium dioxide obtained by the method of thermal decomposition of a mechanical mixture of hydroxide and a stabilizing additive are presented. The forming and sintering of ceramic samples obtained from calcined powders, some properties of ceramics were studied. It has been shown that finegrained dense high-strength ceramics with a flexural strength of 860 MPa and microhardness up to 12‒13 GPa can be obtained from the synthesized powders. Ill. 2. Ref. 12. Tab. 3.

Effect of Fly Ash/Alkaline Activator Ratio and Sodium Silicate/NaOH Ratio on Fly Ash Geopolymer Coating Strength

2013 ◽  
Vol 594-595 ◽  
pp. 146-150 ◽  
Author(s):  
J. Liyana ◽  
Abdullah Mohd Mustafa Al Bakri ◽  
Kamarudin Hussin ◽  
C.M. Ruzaidi ◽  
A. Rashid Azura
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Sodium Silicate ◽  
Sintering Temperature ◽  
Coating Material ◽  
Liquid Ratio ◽  
Alkali Activator ◽  
Alkaline Activator ◽  
Solid Liquid ◽  
Exposure Conditions

Fly ash geopolymer coating material potential used to protect surface used in exposure conditions. Ratio of fly ash/alkaline activator and Na2SiO3/NaOH play important parameter on determining the best flexural strength of geopolymer coating material. Fly ash and alkali activator (Al2O3/Na2SiO3) were mixed with the solids-to-liquid ratios in range of 1.0-3.0 and different ratios of Na2SiO3/NaOH (1.0-3.0) to prepare geopolymer coating material at constant NaOH concentration of 10 M. Effect of fly ash/alkaline activator ratio and Na2SiO3/NaOH on geopolymer coating was determined with respect to the highest flexural strength of the 1200oC sintering temperature of geopolymer coating substrates. The results concluded that the highest strength for fly ash geopolymer coating material is achieved 42 MPa when the solid/liquid ratio is 2.0 and the Na2SiO3/NaOH ratio is 2.5.

Fabrication and Sinter-Ability of Ce3+-Doped YAG Ceramics by Low-Temperature Combustion Method

2011 ◽  
Vol 299-300 ◽  
pp. 493-497
Author(s):  
Zhi Qiang Wang ◽  
Xin Sun ◽  
Xiao Li Zhou
Keyword(s):  
Low Temperature ◽  
Sintering Temperature ◽  
Combustion Method ◽  
Linear Shrinkage ◽  
Raw Material ◽  
Low Temperature Combustion ◽  
Photoluminescence Properties ◽  
X Ray ◽  
Sintering Additive ◽  
Temperature Combustion

The phosphors YAG doped with Ce3+was prepared by low-temperature combustion method. Utilizing the prepared YAG powders as raw material and Li2O-CaO-ZnO-Y2O3-Al2O3-SiO2glass powder as sintering additive, YAG:Ce3+ceramics were sintered at 1400-1550°C for 10h in vacuum. Thesinter-ability of the YAG ceramics was studied by measuring the linear shrinkage rate. The phase, microstructure and photoluminescence properties of the YAG: Ce3+powders and ceramics were investigated by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) analysis. The results show that the sinter-ability properties of YAG:Ce3+ceramics was mainly associated with sintering temperature and contents of glass sintering additive; the best result was achieved when the sample was sintered at 1500°C and doped sintering additive of 1%.

scholarly journals Low-temperature ceramics of the 3Y-TZP-Al2O3 system, containing sintering additives

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 188-191
Author(s):  
T. O. Obolkina ◽  
◽  
M. A. Goldberg ◽  
S. V. Smirnov ◽  
O. A. Antonova ◽  
...  
Keyword(s):  
Low Temperature ◽  
Flexural Strength ◽  
Aluminum Oxide ◽  
Ceramic Material ◽  
Sintering Temperature ◽  
Ceramic Materials ◽  
Al2o3 Content ◽  
Sintering Additives

In this work, we studied the effect of complex additives containing Na2Si2O5 and Ni, Zn oxides on the properties and sintering temperature of a ceramic material 3Y-TZP- Al2O3 with an aluminum oxide (Al2O3) content of 5 wt %. It was shown that the introduction of complex additives promoted an increase in the flexural strength of ceramic materials. The greatest strength (445±22 МПа) was achieved by sintering at 1250 °C on the composition with 5 wt % Na2Si2O5 and 0.33 mol % Zn.

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.

Low Temperature Sintering of (Ba0.98Ca0.02)(Sn0.04Ti0.96)O3 Ceramics Using CuO-B2O3 as a Sintering Additive

2014 ◽  
Vol 602-603 ◽  
pp. 813-816
Author(s):  
Jian Qiang Zhou ◽  
Ke Pi Chen
Keyword(s):  
Low Temperature ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Solid State Reaction Method ◽  
Low Temperature Sintering ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Sintering Additive ◽  
Precision Impedance Analyzer

The effects of CuO-B2O3(CBO) additive on densification, microstructure, and electrical properties of (Ba0.98Ca0.02)(Sn0.04Ti0.96)O3(BCST) cermaics were investigated. The phase compositions, microstructure, dielectric, ferroelectric and piezoelectric properties of BCST ceramics were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), precision impedance analyzer, ferroelectric tester and quasi-static piezoelectric constant testing meter, respectively. The results show that CuO-B2O3(CBO) frit can improve the densification and promote low-temperature sintering of BCST ceramics prepared by a conventional solid-state reaction method. Dense BCST ceramics with CBO can be sintered at temperatures as low as 1175 °C, which is approximately 275 °C less than the sintering temperature of pure BCST. When sintered at 1200 °C, the optimized properties of the BCST ceramics with 0.5 wt% CBO were obtain asε= 1206,d33= 346 pC/N,kP= 0.39, tgδ = 0.009.

Sign in / Sign up

Export Citation Format

Share Document