scholarly journals Introductory Chapter: Ceramic Materials - Synthesis, Characterization, Applications and Recycling

2019 ◽  
Author(s):  
Dolores Eliche-Quesada ◽  
Luis Pérez-Villarejo ◽  
Pedro José Sánchez-Soto
Keyword(s):  
Ceramic Materials ◽  
Materials Synthesis

Model of particle-vapor codeposition with application to ceramic materials synthesis

AIChE Journal ◽  
1991 ◽  
Vol 37 (10) ◽  
pp. 1485-1496 ◽  
Author(s):  
Robert H. Hurt ◽  
Mark D. Allendorf
Keyword(s):  
Ceramic Materials ◽  
Materials Synthesis

scholarly journals Ceramic Materials. Synthesis of Spinel Using Mechano-Chemically Activated Al(OH)3.

2001 ◽  
Vol 50 (6) ◽  
pp. 634-638
Author(s):  
Haruhisa SHIOMI ◽  
Kengo OGAWA ◽  
Ken-ichi OKAMOTO ◽  
Takeshi SHIONO ◽  
Shin-ya OKUMURA ◽  
...  
Keyword(s):  
Ceramic Materials ◽  
Materials Synthesis

Synthesis of Na0.5Bi0.5TiO3 Submicron Particles in Molten Salt

2008 ◽  
Vol 55-57 ◽  
pp. 161-164 ◽  
Author(s):  
Paisan Setasuwon ◽  
S. Kijamnajsuk
Keyword(s):  
Molten Salt ◽  
Piezoelectric Materials ◽  
Low Cost ◽  
Ceramic Materials ◽  
Submicron Particles ◽  
Molten Salt Synthesis ◽  
Powder Size ◽  
Secondary Phases ◽  
Materials Synthesis ◽  
Sulfate Salt

Powder size is a major factor determining the characteristics of processing variables and end-products of ceramic materials. Na0.5Bi0.5TiO3 is one of the potential candidates for non-lead piezoelectric materials, synthesis of Na0.5Bi0.5TiO3 particles in molten salt was studied. Two salt systems, NaCl-KCl and Na2SO4-3K2SO4 were investigated. Only at 850°C and above, BNT was completely formed without any secondary phases in both eutectic chloride and sulfate salt. By substituting chloride with sulfate, the particle size of BNT could be greatly reduced to a few hundreds nanometer at 850°C. Submicron particles of SrTiO3 could also be synthesized in eutectic sulfate salt at 850°C, It is evident that molten salt synthesis could be employed to produce submicron particles of Na0.5Bi0.5TiO3 and SrTiO3. Molten salt synthesis is low-cost and capable to produce fine powders of various complex-oxides.

Ceramics Practicum

2021 ◽  
Author(s):  
Raimundas Šiaučiūnas ◽  
Edita Prichockienė ◽  
Agnė Šmigelskytė
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
Ceramic Body ◽  
Ceramic Materials ◽  
Chemical Technology ◽  
Materials Synthesis ◽  
Fine Ceramic ◽  
Key Characteristics ◽  
English Speaking

The book presents all the methods of testing ceramic raw materials and products made from ceramic materials: first of all, the methods of testing of the properties of clay are discussed; further, determination of its chemical and mineral composition is described followed by methods for testing the key characteristics of a ceramic body and slurry, and, finally, a detailed description of methodologies for determining the performance of construction and fine ceramic products is presented. This textbook is primarily intended for English-speaking students studying the modules Chemical Technology of Ceramic Materials, Synthesis of High-Temperature Materials, Building and Fine Ceramics and Refractory and Modern Ceramics at KTU Faculty of Chemical Technology. It will also be beneficial to students of other KTU faculties or any other universities whose programs deal with the production and processing of building materials.

Examination of Fracture Interfaces in Silicon Nitride

1975 ◽  
Vol 33 ◽  
pp. 60-61
Author(s):  
Nancy J. Tighe
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Slow Crack Growth ◽  
Ceramic Materials ◽  
Grain Boundary Sliding ◽  
Boundary Phase ◽  
Turbine Engines ◽  
Boundary Sliding

Silicon nitride is one of the ceramic materials being considered for the components in gas turbine engines which will be exposed to temperatures of 1000 to 1400°C. Test specimens from hot-pressed billets exhibit flexural strengths of approximately 50 MN/m2 at 1000°C. However, the strength degrades rapidly to less than 20 MN/m2 at 1400°C. The strength degradition is attributed to subcritical crack growth phenomena evidenced by a stress rate dependence of the flexural strength and the stress intensity factor. This phenomena is termed slow crack growth and is associated with the onset of plastic deformation at the crack tip. Lange attributed the subcritical crack growth tb a glassy silicate grain boundary phase which decreased in viscosity with increased temperature and permitted a form of grain boundary sliding to occur.

Stress-Induced Ordering in Y203-Stabilized Tetragonal Zr02

1985 ◽  
Vol 43 ◽  
pp. 222-223
Author(s):  
J. Y. Koo ◽  
M. P. Anderson
Keyword(s):  
Electron Diffraction ◽  
Ionic Conduction ◽  
Electron Diffraction Study ◽  
Ceramic Materials ◽  
Bright Field Image ◽  
Transformation Toughening ◽  
Ion Milling ◽  
Thin Foils ◽  
Carbon Coated ◽  
Convergent Beam

Tetragonal Zr02 has been used as a toughening phase in a large number of ceramic materials. In this system, complex diffraction phenomena have been observed and an understanding of the origin of the diffraction effects provides important information on the nature of transformation toughening, ionic conduction, and phase destabilization. This paper describes the results of an electron diffraction study of Y203-stabilized, tetragonal Zr02 polycrystals (Y-TZP).Thin foils from the bulk Y-TZP sample were prepared by careful grinding and cryo ion-milling. They were carbon coated and examined in a Philips 400T/FEG microscope. Fig. 1 shows a typical bright field image of the 100% tetragonal(t) Zr02. The tetragonal structure was identified by both bulk x-ray diffraction and convergent beam electron diffraction (Fig. 2. A local region within a t-Zr02 grain was subjected to an intense electron beam irradiation which caused partial martensitic transformation of the t-Zr02 to monoclinic(m) symmetry, Fig. 3 A.

Analytical and High-Resolution EM Study of Crystalline Phases formed at Metal-Ceramic Interface

1990 ◽  
Vol 48 (2) ◽  
pp. 426-427
Author(s):  
N. Merk ◽  
A. P. Tomsia ◽  
G. Thomas
Keyword(s):  
Cross Section ◽  
Dissimilar Materials ◽  
Ceramic Materials ◽  
Electron Micrograph ◽  
Scanning Electron Micrograph ◽  
Structural Applications ◽  
Metal Ceramic ◽  
The Subject ◽  
Ceramic Compounds ◽  
Scanning Electron

A recent development of new ceramic materials for structural applications involves the joining of ceramic compounds to metals. Due to the wetting problem, an interlayer material (brazing alloy) is generally used to achieve the bonding. The nature of the interfaces between such dissimilar materials is the subject of intensive studies and is of utmost importance to obtain a controlled microstructure at the discontinuities to satisfy the demanding properties for engineering applications . The brazing alloy is generally ductile and hence, does not readily fracture. It must also wett the ceramic with similar thermal expansion coefficient to avoid large stresses at joints. In the present work we study mullite-molybdenum composites using a brazing alloy for the weldment.A scanning electron micrograph from the cross section of the joining sequence studied here is presented in Fig. 1.

Analytical Electron Microscopy of Surface-Modified Ceramics

1985 ◽  
Vol 43 ◽  
pp. 276-279
Author(s):  
P. S. Sklad
Keyword(s):  
Electron Microscopy ◽  
Analytical Electron Microscopy ◽  
Theoretical Models ◽  
Ceramic Materials ◽  
Solute Concentration ◽  
Second Phase ◽  
Analytical Electron ◽  
Implantation Techniques ◽  
Lattice Damage ◽  
Surface Modified

Over the past several years, it has become increasingly evident that materials for proposed advanced energy systems will be required to operate at high temperatures and in aggressive environments. These constraints make structural ceramics attractive materials for these systems. However it is well known that the condition of the specimen surface of ceramic materials is often critical in controlling properties such as fracture toughness, oxidation resistance, and wear resistance. Ion implantation techniques offer the potential of overcoming some of the surface related limitations.While the effects of implantation on surface sensitive properties may be measured indpendently, it is important to understand the microstructural evolution leading to these changes. Analytical electron microscopy provides a useful tool for characterizing the microstructures produced in terms of solute concentration profiles, second phase formation, lattice damage, crystallinity of the implanted layer, and annealing behavior. Such analyses allow correlations to be made with theoretical models, property measurements, and results of complimentary techniques.

Interface structures in polycrystalline ceramic materials

1986 ◽  
Vol 44 ◽  
pp. 468-471
Author(s):  
K. J. Morrissey
Keyword(s):  
Electron Microscopy ◽  
Analytical Electron Microscopy ◽  
Physical And Mechanical Properties ◽  
High Resolution Electron Microscopy ◽  
Ceramic Materials ◽  
Polycrystalline Materials ◽  
Transmission Electron ◽  
Resolution Electron ◽  
Interface Structures

Grain boundaries and interfaces play an important role in determining both physical and mechanical properties of polycrystalline materials. To understand how the structure of interfaces can be controlled to optimize properties, it is necessary to understand and be able to predict their crystal chemistry. Transmission electron microscopy (TEM), analytical electron microscopy (AEM,), and high resolution electron microscopy (HREM) are essential tools for the characterization of the different types of interfaces which exist in ceramic systems. The purpose of this paper is to illustrate some specific areas in which understanding interface structure is important. Interfaces in sintered bodies, materials produced through phase transformation and electronic packaging are discussed.

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