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 Sintering and properties of ZrO2—Al2O3 ceramic material, containing sintering additives.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 134-137
Author(s):  
T. O. Obolkina ◽  
◽  
M. A. Goldberg ◽  
S. V. Smirnov ◽  
O. A. Antonova ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Ceramic Material ◽  
Zirconium Dioxide ◽  
Sintering Temperature ◽  
Al2o3 Content ◽  
Al2o3 Ceramic ◽  
Sintering Additives ◽  
Fe Oxides

We studied the effect of complex additives containing Na2Si2O5and Co, Fe oxides on the properties and sintering temperature of a ceramic material zirconium dioxide (ZrO2) with an aluminum oxide (Al2O3) content of 10 wt %. It was shown that the introduction of complex additives contributed to the intensification process and a significant increase in the strength and microhardness of the sintered ZrO2—10 % Al2O3. The greatest strength (362 ± 25 МPa) was achieved by sintering at 1250 ° C on the composition of ZrO2—10 % Al2O3—5 % Na2Si2O5+ 0,33 % Fe.

The Relation between Density and Flexural Strength of Geopolymer Based Ceramic with Addition of Ultra High Molecular Weight Polyethylene (UHMWPE) for Lightweight Ceramics

2019 ◽  
Vol 967 ◽  
pp. 286-291
Author(s):  
Romisuhani Ahmad ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Kamaruddin Hussin ◽  
Andrei Victor Sandu ◽  
Mohammed Binhussain
Keyword(s):  
Molecular Weight ◽  
Flexural Strength ◽  
High Molecular Weight ◽  
Sintering Temperature ◽  
Ceramic Materials ◽  
Powder Form ◽  
Liquid Ratio ◽  
Ultra High Molecular Weight ◽  
Strength And Toughness

Geopolymer are being considered for a variety of application including formation of ceramics. The addition of Ultra High Molecular Weight Polyethylene as binder in geopolymer based ceramic is purposely to enhance the strength and toughness of the ceramic materials. This paper aims to study the relation of density and flexural strength of geopolymer based ceramic with addition of Ultra High Molecular Weight Polyethylene as binder. Geopolymer were synthesized by fixing the NaOH molarity, Na2SiO3/NaOH and solid to liquid ratio at 12 M, 0.24 and 1.0 respectively. Geopolymer in a powder form with addition of various content of UHMWPE (2 wt.%, 4 wt.%, 6 wt.%, 8 wt.% ) were pressed into pellets followed by sintering at 1200 °C. The highest flexural strength of geopolymer based ceramics was achieved at sintering temperature of 1200 °C which is 92.1 MPa with a lowest density of 1.88 g/cm3.

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. 

Thick films of ceramic superconducting, electro-ceramic materials

2002 ◽  
Vol 74 (11) ◽  
pp. 2083-2096 ◽  
Author(s):  
H. Altenburg ◽  
J. Plewa ◽  
G. Plesch ◽  
O. Shpotyuk
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Ceramic Material ◽  
Thick Film ◽  
Screen Printing ◽  
Thick Films ◽  
Ceramic Materials ◽  
Superconducting Materials ◽  
Processing Sequence ◽  
Oxide Powders

The use of thick films becomes more and more important in particular for electronic and microelectronic applications. The term “thick film ” does not relate so much to the thickness of the film but more to the kind of deposition. Thick films are made by low-priced processes such as doctor (dr) blading, screen-printing, or spraying methods, etc. The preparation of thick films of ceramic material by these methods generally implies a processing sequence of the following steps: preparation of the oxide powders; preparation of pastes and slurries; painting/printing, etc.of the pastes onto a suitable substrate; drying at low temperature; and sintering at high temperature to get a consolidated layer. These technologies and the fabricated thick films of thermoresistive and superconducting materials will be discussed.

scholarly journals Sinter recrystalization and properties evaluation of glass-ceramic from waste glass bottle and magnesite for extended application

10.30544/223 ◽  
2016 ◽  
Vol 22 (4) ◽  
pp. 285-302
Author(s):  
As'mau Ibrahim Gebi ◽  
Shehu Aliyu Yaro ◽  
Malik Abdulwahab ◽  
Mamuda Rayyan Dodo
Keyword(s):  
Particle Size ◽  
Flexural Strength ◽  
Glass Ceramic ◽  
Sintering Temperature ◽  
Ceramic Materials ◽  
Glass Frit ◽  
X Ray Diffraction ◽  
Glass Bottle ◽  
X Ray ◽  
Glass Ceramic Materials

In a bid to address environmental challenges associated with the management of waste Coca cola glass bottle, this study set out to develop glass ceramic materials using waste coca cola glass bottles and magnesite from Sakatsimta in Adamawa state. A reagent grade chrome (coloring agent) were used to modify the composition of the coca cola glass bottle;  X-ray fluorescence(XRF), X-ray diffraction (XRD) and Thermo gravimetric analysis (TGA) were used to characterize raw materials, four batches GC-1= Coca cola glass frit +1%Cr2O3, GC-2=97% Coca cola glass frit+ 2% magnesite+1%Cr2O3, GC-3=95% Coca cola glass frit+ 4%magnesite+1%Cr2O3, GC-4=93%Coca cola glass frit+ 6%magnesite+ 1%Cr2O3 were formulated and prepared. Thermal Gradient Analysis (TGA) results were used as a guide in selection of three temperatures (7000C, 7500C and 8000C) used for the study, three particle sizes -106+75, -75+53, -53µm and 2 hr sintering time were also used, the sinter crystallization route of glass ceramic production was adopted. The samples were characterized by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM), the density, porosity, hardness and flexural strength of the resulting glass ceramics were also measured. The resulting glass ceramic materials composed mainly of wollastonite, diopside and anorthite phases depending on composition as indicated by XRD and SEM, the density of the samples increased with increasing sintering temperature and decreasing particle size. The porosity is minimal and it decreases with increasing sintering temperature and decreasing particle size. The obtained glass ceramic materials possess appreciable hardness and flexural strength with GC-3 and GC-4 having the best combination of both properties.

Electron Microscopy of Silicon Nitride-Based Ceramics

1991 ◽  
Vol 49 ◽  
pp. 926-927
Author(s):  
Gareth Thomas
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Silicon Nitride ◽  
World Wide ◽  
Sintering Temperature ◽  
Liquid Phase Sintering ◽  
High Temperature Strength ◽  
Sintering Additives ◽  
Glass Forming ◽  
Dense Product

Silicon nitride and silicon nitride based-ceramics are now well known for their potential as hightemperature structural materials, e.g. in engines. However, as is the case for many ceramics, in order to produce a dense product, sintering additives are utilized which allow liquid-phase sintering to occur; but upon cooling from the sintering temperature residual intergranular phases are formed which can be deleterious to high-temperature strength and oxidation resistance, especially if these phases are nonviscous glasses. Many oxide sintering additives have been utilized in processing attempts world-wide to produce dense creep resistant components using Si3N4 but the problem of controlling intergranular phases requires an understanding of the glass forming and subsequent glass-crystalline transformations that can occur at the grain boundaries.

Energy saving technology for sintering of black bricks from high-siliceous clay

MRS Advances ◽  
2020 ◽  
Vol 5 (61) ◽  
pp. 3123-3131
Author(s):  
Mario Flores Nicolas ◽  
Marina Vlasova ◽  
Pedro Antonio Márquez Aguilar ◽  
Mykola Kakazey ◽  
Marcos Mauricio Chávez Cano ◽  
...  
Keyword(s):  
Low Temperature ◽  
Oxygen Deficiency ◽  
Glass Ceramics ◽  
Total Content ◽  
Ceramic Materials ◽  
Ternary Mixtures ◽  
High Porosity ◽  
Reducing Conditions ◽  
Binary And Ternary Mixtures ◽  
Dark Color

AbstractThe low-temperature synthesis of bricks prepared from high-siliceous clays by the method of plastic molding of blanks was used. For the preparation of brick blanks, binary and ternary mixtures of high-siliceous clays, black sand, and bottle glass cullet were used. Gray-black low-porosity and high-porosity ceramics was obtained by sintering under conditions of oxygen deficiency. It has been established that to initiate plastic in mixtures containing high-siliceous clay, it is necessary to add montmorillonite/bentonite additives, carry out low-temperature sintering, and introduce low-melting glass additives with a melting point ranging from 750 to 800 °C. The performed investigations have shown that the sintering of mixtures with a total content of iron oxide of about 5 wt% under reducing conditions at Tsint. = 800°C for 8 h leads to the formation of glass ceramics consisting of quartz, feldspars, and a phase. The main sources of the appearance of a dark color is the formation of [Fe3+O4]4- and [Fe3+O6]9- anions in the composition of the glass phase and feldspars. By changing the contents of clay, sand, and glass in sintering, it is possible to obtain two types of ceramic materials: (a) in the form of building bricks and (b) in the form of porous fillers.

Numerical Modeling and Experimental Characterization of the Pyroplasticity in Ceramic Materials during Sintering

2010 ◽  
Vol 62 ◽  
pp. 203-208 ◽  
Author(s):  
Pasquale Bene ◽  
Danilo Bardaro ◽  
Daniela Bello ◽  
Orazio Manni
Keyword(s):  
Ceramic Material ◽  
Ceramic Materials ◽  
Constitutive Law ◽  
Beam Deflection ◽  
Firing Cycle ◽  
Experimental Characterization ◽  
Viscosity Increase ◽  
Ceramic Components ◽  
Deflection Theory ◽  
Sintering Shrinkage

The aim of the work is the study of the pyroplasticity in ceramic materials in order to simulate the deformations of complex ceramic component during sintering. A ceramic material undergoing densification can be treated as a linear viscous material. Generally, the viscosity decreases as the temperature increases, however the densification and the consequent grain growth, result in a viscosity increase. A bending creep test is proposed for measuring the change in viscosity of the ceramic material during densification. Equations, based on beam deflection theory, are derived to determine the viscosity during the whole firing cycle by measuring the deflection in the centre of specimens. In addition, dilatometric analyses are performed to measure the sintering shrinkage and the specimen density, which continuously changes during the sintering process. On the basis of an accurate experimental characterization the parameters of Maxwell viscoelastic constitutive law are derived. A numerical-experimental procedure has been adopted in order to calibrate the numerical model that, finally, has been used to predict the pyroplastic deformations of complex ceramic components.

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