Micromechanical Properties,Phase Composition,and Microstructure of Ceramics Prepared from Composite Powder (SiC – C) – Si3N4 Using Different Techniques for Introduction of Sintering Activators

Mixtures based on a nanocomposite powder (SiC – C) for hot pressure molding of ceramics are prepared. Micromechanical properties of the sintered ceramics are shown to depend on the technique by which the sintering activator is introduced to the mixture. Results of a study of the structure and phase composition of the sintered ceramics by transmission electron microscopy and x-ray diffractometry are reported.     

Structuring and Mechanical Properties of Composite Ceramics SiC(C) ― Si3N4, Sintered under High Pressure

We have studied the kinetics of high-pressure sintering of a composite SiC(C) ― Si₃N₄ powder of a certain phase composition. We consider structuring and mechanical properties of the ceramics obtained on the basis of this powder.

     

Some Characteristic Features of Formation of Ceramics Based on Composite Powders SiC ― Si3N4 ― Si2N2O

We have studied the characteristic features of synthesis of composite powders SiC Si₃N₄ Si₂N₂O. We have investigated processes involving hot pressing of these powders without activating additives and a protective atmosphere. We consider the mechanical properties of ceramics obtained on the basis of these composite powders.     

Structurization of a titanium-based composite material in the interaction between solid solution of carbon in β-SiC and titanium

The paper examines the high-temperature interaction between powder solid solution of carbon in β-SiC and powder titanium hydride. The structure of the composite materials sintered from the synthesized products and titanium matrix is studied. It is established that the composite alloy has high mechanical characteristics.     

Structuring and Mechanical Properties of Composite Ceramics SiC(C) ― Si3N4, Sintered under High Pressure

We have studied the kinetics of high-pressure sintering of a composite SiC(C) ― Si₃N₄ powder of a certain phase composition. We consider structuring and mechanical properties of the ceramics obtained on the basis of this powder.     

Mechanism for the Formation of a Solid Solution of Carbon in Silicon Carbide

We consider a mechanism for the formation of a solid solution of carbon in silicon carbide when various carbide synthesis methods are used that involve participation of thermally expanded (exfoliated) graphite. We have determined the role of chemical transport reactions in processes of solid-phase interaction between the components of the synthesis. We have optimized the conditions for synthesis of a powder of a solid solution of carbon in silicon carbide with participation of thermally expanded graphite.     

Properties and structure features of nanocomposite powders based on SiC

Features of the synthesis of SiC−Si₃N₄−Si₂N₂O composite powders are studied. The characteristics of the powders are examined on the basis of x-ray diffraction, transmission electron microscopy, and Raman spectroscopy. The structure features and mechanical properties of a ceramics formed on the basis of the synthesized powders are also studied. Institute for Problems of Materials Science, Ukraine National Academy of Sciences, Kiev. Traslated from Poroshkovaya Metallurgiya, Nos. 7–8(408), pp. 12–16, July–August, 1999.