A sol-gel synthesis was carried out by the eutectic composition method in the ternary oxide system MgO-Al 2 O 3 -Y 2 O 3 Used as a sintering aid for silicon carbide ceramics. A laboratory method for the manufacture of an additive is proposed, the effect of the synthesis temperature on the properties of powders is assessed.
The results of studying the process of obtaining porous aluminum oxide, which is a typical self-organizing material, by anodic oxidation of aluminum in acidic solutions are presented. The functional dependences of the influence of the formation conditions on the parameters of the structure of porous anodic aluminum oxide, including the diameters of the pores and oxide cells, have been studied.
The results of research on the development of porous zeolite ceramics based on natural raw materials from the Amur region for catalyst carriers and filters are presented. The structural and mechanical properties of the obtained material have been studied. It is shown that the use of kaolin as a sintering additive during firing contributes to the strengthening of the resulting blanks.
The possibility of obtaining a black pigment based on nickel chromite (NiCr 2 O 4 ) is considered. The morphological, granulometric, X-ray structural and optical characteristics of the synthesized crystalline powders of chromium-nickel spinel have been investigated. During spontaneous crystallization at a temperature of 950 ° C, nickel chromite crystallizes in the structural type of spinel Fd3m with a crystal size from 1.29 to 84 ?m (mainly in the form of an octahedron). The diffuse reflectance spectra showed a high degree of blackness NiCr 2 O 4 : diffuse reflectance from 2.65 to 4.81 & # 37; in the range 320 - 1080 nm. Obtained glazes of black color based on nickel chromite; optimal mass content of pigment 6 - 8 & # 37;
The effect of the introduction of different types of ceramic pigments into the slip on the change in its properties has been studied. Pigments have an emaciating effect on the slip and increase the rate at which the wall of the semi-finished product is set. Aqueous suspensions of ceramic pigments can be neutral, slightly acidic or slightly alkaline and change the rheological properties of the slips they paint: red and blue pigments reduce the thickening coefficient and viscosity, while brown and pink pigments increase
Samples in the form of ingots of aluminum oxynitride (alona) Al 5 O 6 N were obtained by SHS metallurgy using thermite-type mixtures. The experiments were carried out in SHS reactors at an initial nitrogen pressure of 5 MPa. The optimal conditions for the synthesis of the phase of the most stable aluminum oxynitride Al 5 O 6 N. The modes of grinding synthesized ingots into powders of certain fractions have been developed. By the method of spark plasma sintering (IPA), prototypes with high density, hardness and light transmittance were obtained from them.
The preparation of composites based on nanopowders synthesized by the sol-gel method in the system of aluminum oxide and tetragonal zirconium dioxide stabilized by cerium cations (Al 2 O 3 - [Ce-TZP]) is described. ... It is shown that the modification of the compositions with calcium oxide promotes the formation of a dispersion-strengthening phase in the form of long-prismatic grains during the sintering of composites. The presence of this phase affects the increase in strength and resistance to brittle fracture of composites with both the ZrO 2 matrix and the Al 2 O 3 matrix. The static bending strength of composites reaches 1000 MPa, and the fracture toughness K 1s increases to 11.0 MPa m 1/2
Titanosilicates with the structure of natisite Na 2 TiSiO 5 have been synthesized using titanium-silicon intermediate products formed during processing of leucoxene ores as precursors. Using the method of atomic force microscopy, the nanoscale morphological characteristics of the synthesized powders have been studied, and a sample suitable for the production of ion-conducting ceramics has been isolated.
The synthesis of nanodispersed powders of zirconium nitride ZrN using exothermic reactions initiated by microwave radiation has been studied. The obtained ZrN powders were studied using X-ray phase analysis and scanning electron microscopy. The results obtained showed the possibility of synthesizing nanodispersed materials by exothermic reactions when heated by microwave radiation.
Using the method of electrospark sintering (SPS) on the basis of nanosized cobalt oxide powder, a fine-grained (about 200 nm), dense, durable ceramic with a microhardness of up to 10 GPa was created.
