Pyrophyllitic raw materials from the Kul’-Yurt-Tau deposit as a base for ceramic composites

2012 ◽  
Vol 68 (11-12) ◽  
pp. 405-409 ◽  
Author(s):  
V. S. Bakunov ◽  
A. R. Murzakova ◽  
R. U. Shayakhmetov ◽  
L. V. Yakupova
Keyword(s):  
Raw Materials ◽  
Ceramic Composites

scholarly journals Solid-state reaction in nanoparticulate alumina/LZSA glass-ceramic composites

Cerâmica ◽  
2018 ◽  
Vol 64 (371) ◽  
pp. 397-402
Author(s):  
O. R. K. Montedo ◽  
F. Raupp-Pereira ◽  
A. P. N. de Oliveira
Keyword(s):  
Solid State ◽  
Glass Ceramic ◽  
Coefficient Of Thermal Expansion ◽  
Raw Materials ◽  
Glass Frit ◽  
Ceramic Composites ◽  
Solid State Reactions ◽  
X Ray Diffraction ◽  
Dry Powders ◽  
Xrd Study

Abstract In this work, some properties, such as sinterability, modulus of elasticity (E), coefficient of thermal expansion (CTE) and dielectric constant (εr), of composites constituted by nanoparticulate alumina (27-43 nm, 35 m2.g-1) in different contents (0 to 77 vol%) and a LZSA glass-ceramic composition (17.7Li2O-5.2ZrO2-68.1SiO2-9.0Al2O3, molar basis) were evaluated. Dry powders of the raw materials (alumina and LZSA parent glass, frit) were uniaxially pressed (40 MPa) and the obtained compacts were sintered at 600-950 °C (1 h holding time). X-ray diffraction (XRD) study was performed in order to investigate the solid-state reactions occurred in LZSA-based compositions during sintering. XRD results were correlated to the CTE, E and εr of sintered samples. The CTE of the obtained composites decreased as alumina content increased mainly due to the β-spodumeness (solid solution Li2O.Al2O3.4-10SiO2) formation. The results concerning the E (22.3±1.5 GPa) and εr (3.1±1.3) for the composite with 5.6 vol% addition sintered at 850 °C for 1 h indicated, in a preliminary way, the possibility of development of materials with suitable properties for applications concerning to the low temperature co-fired ceramic (LTCC) technology.

Morphological, thermal and optical studies of jute-reinforced PbSrCaCuO–polypropylene composite

2016 ◽  
Vol 30 (31) ◽  
pp. 1650379
Author(s):  
Reenu Jacob ◽  
Jayakumari Isac
Keyword(s):  
Raw Materials ◽  
Natural Fibers ◽  
Ceramic Matrix ◽  
Ceramic Composites ◽  
Jute Fiber ◽  
Optical Studies ◽  
New Research ◽  
Tga And Dsc ◽  
Thermal Stability Of ◽  
Modern Technologies

New research with modern technologies has always grabbed substantial attention. Conservation of raw materials like natural fibers has helped composite world to explore eco-friendly components. The aim of this paper is to study the potential of jute fiber-reinforced ceramic polymers. Alkali-treated jute fiber has been incorporated in a polypropylene ceramic matrix at different volume fractions. The morphological, thermal and optical studies of jute-reinforced ceramic Pb2Sr2CaCu2O9 (PbSrCaCuO) are studied. Morphological results evidently demonstrate that when the polypropylene ceramic matrix is reinforced with jute fiber, interfacial interaction between the varying proportions of the jute fiber and ceramic composite takes place. TGA and DSC results confirm the enhancement in the thermal stability of ceramic composites reinforced with jute fiber. The UV analysis of the composite gives a good quality measure on the optical properties of the new composite prepared.

Devitrification in SiO2-B2O3-Al2O3-La2O3-TiO2 Glass during the Infiltration of Ceramic Composite

2016 ◽  
Vol 881 ◽  
pp. 77-82
Author(s):  
Afonso Chimanski ◽  
Amanda Martins Jordão ◽  
Paulo Francisco Cesar ◽  
Humberto Naoyuki Yoshimura
Keyword(s):  
Ceramic Composite ◽  
Raw Materials ◽  
Porous Alumina ◽  
Ceramic Composites ◽  
X Ray Diffraction ◽  
Infiltration Process ◽  
X Ray ◽  
Dental Prostheses ◽  
Devitrification Process ◽  
Natural Teeth

Dental prostheses made of ceramic composites infiltrated with glasses have been used due to their biocompatibility and possibility to mimic the natural teeth. In this study, the devitrification behavior of 20SiO2-25B2O3-25Al2O3-15La2O3-15TiO2 glass during the infiltration process in a porous alumina preform was investigated. Glass frits were prepared by melting the raw materials at 1500 °C for 60 min. The glass was infiltrated into the alumina preform at 1,150 or 1,200 °C for 60 min. The specimens were characterized by X-ray diffraction analysis and scanning electron microscopy. After the infiltration, it was possible to note that the devitrification process occurred in the remaining glass (excess glass that did not infiltrate in the preform), forming mostly aluminum borate and mullite crystalline phases. However, within the infiltrated composite no devitrification was noticed in the infiltrated glass. Possible explanations for this behavior are discussed.

Novel Intermediate Temperature Ceramic Composites, Materials and Processing for Siloxane Based Basalt Fiber Composites

2014 ◽  
Vol 611-612 ◽  
pp. 382-390 ◽  
Author(s):  
Rainer Gadow ◽  
Patrick Weichand
Keyword(s):  
Polymer Matrix Composites ◽  
Raw Materials ◽  
Basalt Fiber ◽  
Ceramic Composites ◽  
Filament Winding ◽  
Limiting Factor ◽  
Major Drawback ◽  
Reinforced Polymers ◽  
Promising Alternative ◽  
Manufacturing Technologies

SiC composites have been developed by various processing methods, i. e. reaction bonding, CVD/CVI and liquid phase impregnation. This class of composites is handicapped by the high cost of investment and processing, interface coatings and raw materials and therefore only attractive for applications in astronautics and military aviation. Polymer Matrix Composites (PMC) are widely used in lightweight applications. The manufacturing technologies are fully developed and raw materials are cheap. The major drawback and limiting factor of these reinforced polymers is the limited service temperatures. Novel composite materials, bridging the gap between PMC and CMC, are manufactured by the use of polysiloxanes as SiOC matrix precursor. Such competitive free formable composites are capable for service temperatures up to 800 °C even in oxidative atmosphere. In order to make the material attractive for series applications, cost effective manufacturing technologies like Resin Transfer Moulding (RTM), filament winding or warm pressing techniques are employed. Beside the improved thermal and chemical resistivity in comparison to reinforced polymers and light metals, a major benefit of SiOC composites is investigated in the field of friction materials. A promising alternative to carbon and synthetic ceramic fibers are mineral based Basalt fibers. These lightweight fibers show high thermochemical stability up to 700 °C, are relatively cheap and became recently available in industrial scale.

scholarly journals A Simple Approach to Bulk Bioinspired Tough Ceramics

2020 ◽  
Author(s):  
Hassan Saad ◽  
Kaoutar Radi ◽  
Thierry Douillard ◽  
David Jauffres ◽  
Christophe Martin ◽  
...  
Keyword(s):  
Materials Science ◽  
Raw Materials ◽  
Scale Up ◽  
Ceramic Composites ◽  
Simple Approach ◽  
Initiation Toughness ◽  
Damage Resistance ◽  
Brick And Mortar ◽  
Materials Science And Engineering ◽  
Field Assisted Sintering

The development of damage-resistant structural materials that can withstand harsh environments is a major issue in materials science and engineering. Bioinspired brick-and-mortar designs have recently demonstrated a range of interesting mechanical properties in proof-of-concept studies. However, reproducibility and scalability issues associated with the actual processing routes have impeded further developments and industrialization of such materials. Here we demonstrate a simple approach based on uniaxial pressing and field assisted sintering of commercially available raw materials to process bioinspired ceramic/ceramic composites of larger thickness than previous approaches, with a sample thickness up to 1 cm. The ceramic composite retains the strength typical of dense alumina (430 ± 30 MPa) while keeping the excellent damage resistance demonstrated previously at the millimeter scale with a crack initiation toughness of 6.6 MPa.m 1/2 and fracture toughness up to 17.6 MPa.m 1/2. These results validate the potential of these all-ceramic composites, previously demonstrated at lab scale only, and could enable their optimization, scale-up, and industrialization.

Mechanical and Thermal Properties of MgAl2O4-Y3Al5O12 Ceramic Composites

2018 ◽  
Vol 281 ◽  
pp. 255-260 ◽  
Author(s):  
Jiang Bo Liu ◽  
Zhou Fu Wang ◽  
Hao Liu ◽  
Xi Tang Wang ◽  
Yan Ma
Keyword(s):  
Thermal Properties ◽  
Raw Materials ◽  
Laser Flash ◽  
Ceramic Composites ◽  
Mechanical And Thermal Properties ◽  
X Ray Diffraction ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients ◽  
Increasing Temperature ◽  
Flash Diffusivity

MgAl2O4-Y3Al5O12 ceramic composites were prepared using fused spinel and a Y2O3 micropowder as the raw materials. The microstructure and thermal properties of the composites were characterized by X-ray diffraction, scanning electron microscopy, laser flash diffusivity measurements. The mechanical properties were also determined. MgAl2O4-Y3Al5O12 ceramic composites are composed of spinel and garnet structures. The thermal expansion coefficients of MgAl2O4 and MgAl2O4-Y3Al5O12 ceramics are similar. The measured thermal diffusivity decreases gradually with increasing temperature. Thermal conductivity of the composites is in the range of 3.3-5.8 W∙m-1∙K-1 from 400°C to 900°C.

scholarly journals A Simple Approach to Bulk Bioinspired Tough Ceramics

2020 ◽  
Author(s):  
Hassan Saad ◽  
Kaoutar Radi ◽  
Thierry Douillard ◽  
David Jauffres ◽  
Christophe Martin ◽  
...  
Keyword(s):  
Materials Science ◽  
Raw Materials ◽  
Scale Up ◽  
Ceramic Composites ◽  
Simple Approach ◽  
Initiation Toughness ◽  
Damage Resistance ◽  
Brick And Mortar ◽  
Materials Science And Engineering ◽  
Field Assisted Sintering

The development of damage-resistant structural materials that can withstand harsh environments is a major issue in materials science and engineering. Bioinspired brick-and-mortar designs have recently demonstrated a range of interesting mechanical properties in proof-of-concept studies. However, reproducibility and scalability issues associated with the actual processing routes have impeded further developments and industrialization of such materials. Here we demonstrate a simple approach based on uniaxial pressing and field assisted sintering of commercially available raw materials to process bioinspired ceramic/ceramic composites of larger thickness than previous approaches, with a sample thickness up to 1 cm. The ceramic composite retains the strength typical of dense alumina (430 ± 30 MPa) while keeping the excellent damage resistance demonstrated previously at the millimeter scale with a crack initiation toughness of 6.6 MPa.m 1/2 and fracture toughness up to 17.6 MPa.m 1/2. These results validate the potential of these all-ceramic composites, previously demonstrated at lab scale only, and could enable their optimization, scale-up, and industrialization.

Mechanical Properties of Hot-Pressed B4C-TiB2 Composites Synthesized from B4C-TiO2 and B4C-TiC

2021 ◽  
Vol 902 ◽  
pp. 81-86
Author(s):  
Shu Mao Zhao ◽  
Ling Ran Zhao
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Volume Fraction ◽  
Raw Materials ◽  
Ceramic Composites ◽  
In Situ Synthesis ◽  
Second Phase ◽  
Pressing Method ◽  
The One

In this study, B4C-TiB2 ceramic composites were manufactured by hot pressing method. The raw materials for the in-situ synthesis of TiB2 were TiO2 and TiC. After being sintered at 1900°C for 60min under a pressure of 30MPa, compact composites samples with a TiB2 volume fraction range from 0 to 11.05% were prepared. The relative density, fracture toughness and flexural strength of different sample were tested. Microstructures on the fracture surface were studied by SEM. The result shows that B4C-TiB2 ceramic composites sintered from B4C-TiC had a better mechanical property than the one sintered from B4C-TiO2. When the content of TiB2 (reacted from TiC) was 11.05vol.%, the strength and toughness of B4C-TiB2 ceramics can reach 598MPa and 6.45MPa·m1/2. The toughening mechanisms of B4C-TiB2 composites include micro-crack toughening and energy consumption by the pulling out process of second phase.

New Advanced SiC Ceramics Based on Natural Biomaterials

2012 ◽  
Vol 729 ◽  
pp. 350-355 ◽  
Author(s):  
László A. Gömze ◽  
Dóra Lipusz ◽  
Ludmila N. Gömze
Keyword(s):  
Silicon Carbide ◽  
High Purity ◽  
Raw Materials ◽  
Xrd Analysis ◽  
Ceramic Composites ◽  
Low Density ◽  
High Porosity ◽  
X Ray Diffraction ◽  
Trade Name ◽  
Sic Ceramic

On the basis of several years experiments in investigation of hetero-modulus material structures and using natural biomaterials and high purity quartz powders the authors successfully developed new high porosity low density SiC ceramic cellulars and foams. For the development of new silicon-carbide and carbon-silicon-carbide (C/SiC) cellular ceramic composites and foams the author used high purity SiO2 powders mined in Fehervarcsurgo (Hungary) and a biomaterial reagents made from renewable vegetable under trade-name IG-R1. These low density high porosity silicon-carbides probably can be successfully applied in development of light weight ceramic reinforced metal alloy composites in the future. The structure and X-ray diffraction (XRD) analysis of used raw materials and the achieved by authors new SiC and C/SiC ceramic composites and foams are described and shown in present work.

scholarly journals Development of bioactive and biocompatible ceramic composites based on potassium polytitanate

2019 ◽  
Vol 13 (2) ◽  
pp. 149-156
Author(s):  
Ángel Villalpando-Reyna ◽  
Dora Cortés-Hernández ◽  
Jose Granjeiro ◽  
Marcelo Prado ◽  
Alexander Gorokhovsky ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Calcium Silicate ◽  
Raw Materials ◽  
Ceramic Composites ◽  
Negative Control ◽  
Calcium Titanate ◽  
In Vitro Cytotoxicity ◽  
Apatite Formation ◽  
Potassium Polytitanate

Bioactive and biocompatible composites were successfully prepared by reactive sintering of mixtures of a crystalline titanate precursor and 45S5 Bioglass?. The polytitanate/glass precursor ratios were 20/80, 40/60, 60/40 or 80/20 (wt.%). The powder mixtures were uniaxially pressed and heat treated at 1000 ?C for 1 h. During sintering, intensive interactions between raw materials occurred. The formed main crystalline phases were: potassium hexatitanate (K2Ti6O13), calcium titanate (CaTiO3), calcium silicate (CaSiO4) and sodium-calcium silicate (Na6Ca3Si6O18). Additionally, a Si-rich glassy phase was also observed. The mechanism of apatite formation indicated that both crystalline and amorphous phases play important roles in this process. A homogeneous apatite layer was formed on Si-OH, Ti-OH-rich interfaces. In vitro bioactivity was assessed using simulated body fluid (SBF K-9). The in vitro cytotoxicity behaviour was evaluated using a human osteoblastlike cells model and compressive strength by ASTM C-773 standard. All the composites demonstrated high bioactivity as cytotoxicity assays indicated a biocompatibility similar to that of the negative control. The samples showed high cell adherence and elongation cell characteristics similar to those observed on biocompatible systems. The compressive strength of the sintered samples decreased as the polytitanate content precursor was increased. The results obtained indicate that these materials are highly promising composites for medical applications.

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