33 research outputs found
HIGH TEMPERATURE COMPOSITES WITH REINFORCING OXIDE FIBERS AND PLATES AND NiAl AND AL2O3 MATRICES
Fibrous and layered composites with intermetallic NiAl and oxide Al2O3 matrices reinforced with composite fibers or plates obtained by internal crystallization method were obtained by diffusion welding in vacuum. LaAl11O18βAl2O3 fibers and plates provide acceptable strength and fracture toughness of composites in the temperature range of 20β1400 Β°C.ΠΠ΅ΡΠΎΠ΄ΠΎΠΌ Π΄ΠΈΡΡΡΠ·ΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠ²Π°ΡΠΊΠΈ Π² Π²Π°ΠΊΡΡΠΌΠ΅ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ Π²ΠΎΠ»ΠΎΠΊΠ½ΠΈΡΡΡΠ΅ ΠΈ ΡΠ»ΠΎΠΈΡΡΡΠ΅ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΡ Ρ ΠΈΠ½ΡΠ΅ΡΠΌΠ΅ΡΠ°Π»Π»ΠΈΠ΄Π½ΠΎΠΉ NiAl ΠΈ ΠΎΠΊΡΠΈΠ΄Π½ΠΎΠΉ Al2O3 ΠΌΠ°ΡΡΠΈΡΠ°ΠΌΠΈ, Π°ΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΡΠ΅ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΡΠΌΠΈ Π²ΠΎΠ»ΠΎΠΊΠ½Π°ΠΌΠΈ ΠΈΠ»ΠΈ ΠΏΠ»Π°ΡΡΠΈΠ½Π°ΠΌΠΈ, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠΌΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π²Π½ΡΡΡΠ΅Π½Π½Π΅ΠΉ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΠ·Π°ΡΠΈΠΈ. LaAl11O18βAl2O3 Π²ΠΎΠ»ΠΎΠΊΠ½Π° ΠΈ ΠΏΠ»Π°ΡΡΠΈΠ½Ρ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΠ²Π°ΡΡ ΠΏΡΠΈΠ΅ΠΌΠ»Π΅ΠΌΡΡ ΠΏΡΠΎΡΠ½ΠΎΡΡΡ ΠΈ ΡΡΠ΅ΡΠΈΠ½ΠΎΡΡΠΎΠΉΠΊΠΎΡΡΡ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΎΠ² Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡ 20β1400 Β°C.Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΡΠΈ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΠΎΠΉ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠ³ΠΎ ΡΠΎΠ½Π΄Π° ΡΡΠ½Π΄Π°ΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ (ΠΏΡΠΎΠ΅ΠΊΡ β 17-03-01136 Π°)
COMPOSITE OXIDE FIBERS FOR REINFORCING BRITTLE MATRICES
By the method of internal crystallization fibers based on the systems of oxides Al2O3βCaO, Al2O3βBaO, and Al2O3βLa2O3 were obtained. The fibers are tested for strength.The strength of the fibers is ensured by sapphire, and the fracture toughness is ensured by calcium hexaaluminates, or barium, or lanthanum, which are part of their structures.ΠΠ΅ΡΠΎΠ΄ΠΎΠΌ Π²Π½ΡΡΡΠ΅Π½Π½Π΅ΠΉ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΠ·Π°ΡΠΈΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ Π²ΠΎΠ»ΠΎΠΊΠ½Π° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΈΡΡΠ΅ΠΌ ΠΎΠΊΡΠΈΠ΄ΠΎΠ² Al2O3βCaO, Al2O3βBaO, Al2O3βLa2O3. ΠΠΎΠ»ΠΎΠΊΠ½Π° ΠΈΡΠΏΡΡΠ°Π½Ρ Π½Π° ΠΏΡΠΎΡΠ½ΠΎΡΡΡ. ΠΡΠΎΡΠ½ΠΎΡΡΡ Π²ΠΎΠ»ΠΎΠΊΠΎΠ½ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΠ²Π°Π΅ΡΡΡ ΡΠ°ΠΏΡΠΈΡΠΎΠΌ, Π° ΡΡΠ΅ΡΠΈΠ½ΠΎΡΡΠΎΠΉΠΊΠΎΡΡΡ β Π³Π΅ΠΊΡΠ°Π°Π»ΡΠΌΠΈΠ½Π°ΡΠ°ΠΌΠΈ ΠΊΠ°Π»ΡΡΠΈΡ, ΠΈΠ»ΠΈ Π±Π°ΡΠΈΡ, ΠΈΠ»ΠΈ Π»Π°Π½ΡΠ°Π½Π°, Π²Ρ
ΠΎΠ΄ΡΡΠΈΠΌΠΈ Π² ΡΠΎΡΡΠ°Π² ΠΈΡ
ΡΡΡΡΠΊΡΡΡ.Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΡΠΈ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΠΎΠΉ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠ³ΠΎ ΡΠΎΠ½Π΄Π° ΡΡΠ½Π΄Π°ΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ (ΠΏΡΠΎΠ΅ΠΊΡ β 17-03-01136 Π°)
Impurity phases in beryllium oxide ceramic
An x-ray spectrographic method with an electron probe and a scanning electron microscope are used to study industrial ceramic specimen surface composition, distinguished by presence of a different color for both the main part, and impurity phases. BeO-ceramic specimens, having a visually differing color, are conditionally separated into three types. In reflected electron microphotographs impurities are distinguished qualitatively with respect to electrical conductivity. Iron impurity is invariably present within the composition of electrically conducting phases and inclusions. Apart from iron, all impurity phases contain carbon, aluminum, silicon, and calcium, and within individual phases there are admixtures of manganese, magnesium, chromium, potassium, sodium, zinc, phosphorus, and chlorine, which may be introduced into BeO-ceramic during production and sintering in repeatedly used industrial furnaces from linings and residual atmosphere. Β© 2013 Springer Science+Business Media New York
LAYERED-FIBROUS COMPOSITE BASED ON NIOBIUM REINFORCED BY SAPPHIRE FIBERS
A structure was developed and specimens of composite materials with a niobium.based layered matrix, unidirectionally reinforced with single.crystal sapphire fibers, were obtained by the solid.phase method of diffusion welding. X.ray microanalysis and mechanical tests of the obtained materials were carried out.Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π° ΡΡΡΡΠΊΡΡΡΠ°, ΠΈ ΡΠ²Π΅ΡΠ΄ΠΎΡΠ°Π·Π½ΡΠΌ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π΄ΠΈΡΡΡΠ·ΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠ²Π°ΡΠΊΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ ΠΎΠ±ΡΠ°Π·ΡΡ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² ΡΠΎ ΡΠ»ΠΎΠΈΡΡΠΎΠΉ ΠΌΠ°ΡΡΠΈΡΠ΅ΠΉ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π½ΠΈΠΎΠ±ΠΈΡ, ΠΎΠ΄Π½ΠΎΠ½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΠΎ Π°ΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΡΠ΅ ΠΌΠΎΠ½ΠΎΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ Π²ΠΎΠ»ΠΎΠΊΠ½Π°ΠΌΠΈ ΡΠ°ΠΏΡΠΈΡΠ°. ΠΡΠΎΠ²Π΅Π΄Π΅Π½Ρ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΡΡΡΡΠΊΡΡΡΠ½ΡΠΉ ΠΌΠΈΠΊΡΠΎΠ°Π½Π°Π»ΠΈΠ· ΠΈ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈΡΠΏΡΡΠ°Π½ΠΈΡΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ²
Electrodynamic characteristics of the nonresonant system of transverse slots in the wide wall of a rectangular waveguide
The method of induced magnetomotive forces is applied to the problem of electromagnetic wave radiation by a system of transverse slots located in the wide wall of finite thickness of a rectangular waveguide. The paper includes calculation of space-energy characteristics of linear multislot nonresonant antenna arrays of the leaky wave. Comparison of the numerical results, obtained by Galyorkinβs method, with the experimental data is performed