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The paper summarises the author's research on the preparation of dense beta-sialon materials using a combustion (SHS) method. The following aspects of sialon technology are discussed: the preparation of sialon powders, the powders characteristics, their processing and densification, as well as the characterisation of dense sialon polycrystals.
As an introduction to the publication dealing with research into advanced ceramic structural materials an outline of the main properties and apllications of these materials is given in the present essay.
A hydrothermal synthesis was used to prepare zirconia ultrafine powders stabilised with 6 mol % CaO. The influence of pH of a coprecipitation and crystalisation environment on the chemical composition and morphology of resultant powders was studied. Behaviour of the powders during compaction and sintering was characterised. The crystallisation mechanisms in the NaOH environment were discussed. Requirements...
The aim of the present paper was to demonstrate that a quantitative description of the microstructure of an advanced ceramic material can be efficiently obtained using modern computer-aided methods. Such a description is necessary for realistic modelling of properties and perhaps may lead to improvements in the technology of producing such materials.
The main objective of this paper is to explain the role of activators in silicon carbide sintering. On the basis of dihedral angle measuremets in model systems the authors postulate rejection of the S. Prochazka hypothesis saying that boron and carbon modify the grain-boundary and surface energy. Evolution of microstructure observed on model sinters and the data available in the literature enabled...
The paper presents the results of the computer aided quantitative analysis of the three groups of the ceramic composites: [formulas]. The methods of visualization and processing were elaborated and the representative microstructural characteristics for these materials have been thus obtained. The relationship between the microstructure and parameters of synthesis can be thus studied.
Sialon ceramics appear to be an attractive engineering material because of their excellent mechanical and thermal properties. Carbothermal production can be the most economical route for the production of the relevant sialon powders if some problems of multiphase composition are overcome. Thermodynamic calculations of the equilibrium composition in the Si-O-N-C and Al-O-N-C systems have been performed...
A device was designed and constructed for direct observations of crack growth from notch or form Vickers indent made on the beam bent in a typical testing machine. The device, consisting of horizontal light microscope coupled with CCD camera, is fitted to ZWICK 1446 testing machine by the system of elevator stages driven by stepping motors. This enables precise movements of objective in x, y, z-direction,...
The joinability of materials that show significant difference in their physical and chemical properties is a function directly proportional to the absolute number of Gibbs free energy negative value and to the values of the diffusion coefficients of the ions or atoms of couple of materials under joining, and inversely proportional to the difference of their thermal expansion coefficients. The paper...
The paper presents the results of investigations on particulate ceramic composites with the tetragonal zirconia polycrystalline (TZP) matrix. The WC, CrxCy and TiC particles were used as additives. The possibility of a chemical reaction in these systems was taken into account. Stresses caused by coefficient of thermal expansion mismatch of composite constituents were estimated. Phase composition and...
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