Homogeneity and stability of volume electrical discharges in gas mixtures based on SF6
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The electric parameters of the volume discharge and the transition of the discharge from the volume combustion to the channel stage are experimentally studied. It is shown that cathode spots of a hemispherical shape appear at the stage of the discharge formation. Over them, plasma plumes are developed which are combined to form a volume column of the discharge plasma. The discharge homogeneity increases with increasing density of the cathode spots. The distortion of the shape of cathode spots initiates the development of plasma channels. The development of the plasma channel is computer simulated. The results of calculations are discussed and compared with experimental data.Cite
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Vickers hardness test
Functionally graded material
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Excellent homogeneity is the base of HPC (high performance concrete).In this paper, the effect of concrete homogeneity on its properties was studied. The properties of concrete with different homogeneity by adjusting dosage and types of superplasticizers were measured. Results show that the mechanical properties and durability of concrete can be affected by homogeneity.
Superplasticizer
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Porous SiC Ceramics with Multiple Pore Structure Fabricated via Gelcasting and Solid State Sintering
Porous SiC ceramics with multiple pore structures were fabricated via gelcasting and solid state sintering.A novel gelling agent of Isobam was applied and PMMA was used as both foam stabilizer and pore forming agent.The mechanical properties of porous SiC ceramics were investigated as functions of PMMA content, rotating speed of ball mill, and sintering temperature.With PMMA content increasing from 5wt% to 20wt%, the foaming effect was inhibited while the stability of bubbles increased.When the rotating speed was 220 r/min, the open porosities of the as-prepared SiC ceramics sintered at 2100 varied ℃ from 51.5% to 72.8%, and compressive strength varied from 7.9 to 48.2 MPa.With the rotating speed increasing from 220 to 280 r/min, the foaming effect was aggravated and the porosities of SiC ceramics sintered at 2100 increased.℃ While the sintering temperature increasing from 2050 to 2150 , ℃ the SiC ceramics prepared with PMMA content of 20wt% at rotating speed of 220 r/min decreased in the open porosities while increased in compressive strength.
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Structural material
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This paper describes diffractometric and interferometric installations for monitoring the optical homogeneity of materials in the mid- and far-IR regions. It gives the results of a calculation of the errors of optical homogeneity measurements by various methods. The results of measuring the optical homogeneity of large blanks made from optical crystals in the IR region are presented.
Optical materials
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Nanocrystalline material
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