Materials Literature
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As a means for improving the iron loss in grain oriented silicon steel sheets, a TiN ceramic film was formed by a CVD method on the polished silicon steel sheet. The following results were obtained.(1) The TiN ceramic film moderately increased the magnetic flux density B8 (T) of the silicon steel sheet by 0.009-0.012…
We employed the constant photo-conductivity method (CPM) to measure the optical absorption spectra of nano-crystalline siilicon films (nc-Si :H) in the energy range of 0. 9-2. 5eV. We analysed some possible major optical transition processes resulting from the photo-conductivity at different photon energy range and th…
To elucidate the effect of hardened depth on the fatigue strength of carbonitrided gears, gears with three kinds of hardened depths were fatigue-tested using a power circulating gear testing machine. In the case of gears with the shallowest and intermediate hardened depths, the failure mode was spalling. In the case o…
The electrical joining of Si3N4 ceramics using a local heating system was studied to clarify the relevant heating mechanism. In this study, a CaF2/kaolinite mixture with suitable electroheating characteristics and good reactivity with Si3N4 ceramics was used as a joining agent. The temperature characteristics of condu…
High-performance ceramics have attracted much interest during the last decade, but a broad market introduction has not taken place so far due to the inherent disadvantages of ceramic components in applications with high mechanical loadings. The high brittleness and the low reliability as compared to metals, as well as…
Powder metallurgical additions of Bi enhance the temperature stability of (Nd, Dy)-Fe-B permanent magnets. Bi is not solved in the hardmagnetic RE 2 Fe 14 B phase, thus does not influence the intrinsic magnetic properties, Only the microstructure of the sintered magnets is changed. Addition of a few wt.% of Bi leads t…
Abstract The GaAs MESFET is a light‐sensitive device. For normal microwave applications this is considered an undesirable property, and device manufacturers attempt to minimize it. In the last decade researchers discovered ways of utilizing this effect. In this article we present briefly the optical detection properti…
A study was made on the effect of the inter-pass aging during cold rolling on the secondary recrystallization of the grain-oriented electrical steel with Sn produced by the single-stage cold rolling process. The following conclusions were obtained.(1) The specimen without Sn yields a perfect secondary recrystallizatio…
Statistical calculating programs simulating partial discharge appearance are developed and applied to evaluations of criteria for descrimination of the partial discharges from noises. According to the simulation, clusters of sequential pulses appear at the partial discharge inception voltage, which have never been uti…
非定常熱流法を用いて高吸水性ポリマーの熱物性値を測定した。 有効熱拡散率および有効熱伝導率を乾燥状態と吸水状態について測定し、 含水率はポリマーとの重量比で0から100まで変化させ、 温度は20℃から80℃まで変化させた。 乾燥ポリマーは温度依存性がみられなかったが、 吸水状態では、 有効熱伝導率について温度依存性がみられた。
In the cosmetic industry, many inorganic powders are used, and for their easy handling and improvement of functional properties of the powders, various things are demanded. Generally, powder characteristics and surface phenomena concerning the inorganic powders depend largly on their surface properties. Therefore, sur…
An account is given of the R & D activity at Bhabha Atomic Research Centre on transformation toughened zirconia ceramics. Special reference is made to the preparation of zirconia powders by the hydrothermal route. The details of compaction of powders obtained by hydrothermal and co-precipitation routes and their sinte…
Following the 1st report, we extend our investigations of a combined cycle with hightemperature helium-gas and steam turbines.Recently in thermal power generation a great interest is focussed on the combined cycle, which has been positively introduced. The combined cycle with high-temperature helium- gas and steam tur…
Corrosion resistance of sintered SiC ceramics, which were prepared using defferent sintering methods, crystal structures and sintering aids, were tested in pure water, 0.1kmol·m-3 H2SO4, and 0.1kmol·m-3 LiOH at 300°C for 50h. It was found that the corrosion resistance of SiC ceramics prepared using pressureless sinter…
Stainless steel pipes whose inner surface is electro-polished have become applied as the pipings for purified gases used in the semiconductor processing. In order to maintain the purity of the gases, the piping is required not to release particles and impure gases from its surface and to have excellent resistance to c…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Mohamed S. El‐Genk, Dmitry Paramonov; An analysis of thermionic space nuclear reactor power syste…
In this paper, a numerical method ‐ Spline Function has been used to determine the parameters of adsorption fixation kinetics onto granular activated carbon surface (PICA NC60) in a range of aromatic compounds in batch reactor. This description allows us to examine the validity of Adams‐Bohart model (AB). The test com…
A study was undertaken of the formation of solid solutions with the garnet structure in the systems M3Ga5O12–M′O2–CaO (where M = Y3+, Nd3+ and M′= Zr4+, Ti4+). Synthesis of these compounds was performed by the traditional ceramic route as well as through hydroxide coprecipitation. Characterization was mainly carried o…
This study describes the dissolved state of colloidal silica in water and its adsorption properties on anion exchange resins (AERs) . A colloidal silica solution of 3% was prepared by ion exchange resin method from a sodium silicate solution. The colloidal silica in water formed about 10 nm particles in diameter. When…
An effective mixture method, which allows the treatment of polydispersed fluids, is presented. Within this method, correlation and thermodynamic functions are evaluated solving the multicomponent Ornstein–Zernike equation with the Rogers–Young closure. The method is tested by making comparisons with simulations and wi…