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Conclusions The addition of 0.3% Yb to an alloy of the Magnico type alloyed with 0.9% Si, 0.5% Nb, and 0.2% Ti increases the maximum magnetic energy to 24 kJ/m3 and reduces the quantity of harmful impurities, which substantially improves the grindability of the alloy.Novocherkassk Scientific-Research Institute of Permanent Magnets. Translated from Metallovedeme i Termicheskaya Obrabotka Metallov, No. 7, pp. 49–50, July, 1976. 相似文献
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E. N. Kablov V. P. Piskorskii R. A. Valeev N. V. Volkov E. A. Davydova K. A. Shaikhutdinov D. A. Balaev S. V. Semenov 《Russian Metallurgy (Metally)》2014,2014(1):55-59
The effect of copper on the properties of magnets (Pr0.52Dy0.48)13(Fe65Co0.35)80.3 ? x Cu x B6.7 (x = 0–10) has been studied. Alloying with copper is shown to decrease the sintering temperature and to increase the content of the principal (Pr,Dy)2(Fe,Co)14B magnetic phase. For compositions with x = 1.3–3.3, copper is found to affect the value and sign of the temperature induction coefficient (TIC). It is shown that the effect of copper on the TIC is determined by the substitution of copper ions for iron ions in lattice sites, which are coupled via an antiferromagnetic exchange interaction. 相似文献
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O. N. Baklanova V. A. Likholobov M. S. Tsekhanovich V. Yu. Davydova O. A. Chirkova V. A. Drozdov Yu. V. Surovikin 《Catalysis in Industry》2009,1(2):153-156
New large-scale technology can produce porous carbon-carbon composites shaped as 0.5–5 mm grains on the basis of globular nanodisperse carbon (GNC); these composites are referred to as Sibunit. The use of this material as units of more complex shapes, such as rods, tubes, and petals, can help to reduce the hydraulic drag of the sorbent or catalyst bed. The tasks of this study were to manufacture, via extrusion molding, rods on the basis of GNC with various primary particle sizes and to study the effect of GNC particle sizes and heat-treatment parameters on the specific surface area of molded Sibunit. The GNC particle size has a decisive effect on the texture parameters. The greatest specific surface area (600–700 m2/g) was obtained for GNC with particle sizes of (15–20) ± 5 nm with the strength retained at a level of 3–5 N/mm2. The results of this work are recommended for use in the development of large-scale technology for manufacturing Sibunit-type supports in various shapes with particle sizes of 2–12 mm and inner channel diameters of 1–6 mm. 相似文献
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Tretyakov Valentin F. Burdeynaya Tatyana N. Davydova Margarita N. Matyshak Valerii A. Glebov Leonid S. 《Topics in Catalysis》2001,16(1-4):243-245
The process of selective catalytic reduction of nitrogen oxides by propane in the presence of O2, as well as in the presence or absence of CO, was studied over series of commercial oxide catalysts used in petrochemical processes. For the first time synergistic effect was observed for catalytic systems consisting of mechanical mixtures of Cu–Zn–Ni–Al (catalyst I) + Fe–Cr (catalyst II) and Cu–Zn–Ni–Al (catalyst I) + Ni–Cr (catalyst III). The activity of these mixtures in nitrogen oxides reduction by propane was greater than that of individual components in each case. The worked-out catalytical systems showed high effectivity in the process of simultaneous removal of several toxic components: NO
x
, CO, hydrocarbons – from model gas mixtures, as well as from real exhausts of automotive transport. 相似文献
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Alexander Kromka Marina Davydova Bohuslav Rezek Milan Vanecek Martin Stuchlik Petr Exnar Martin Kalbac 《Diamond and Related Materials》2010,19(2-3):196-200
Toxic gas sensing device with metal electrodes built into nanocrystalline diamond (NCD) is investigated. The NCD morphology is controlled via seeding and/or deposition time. The surface properties and morphology of NCD are studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM). AFM measurements reveal increase in NCD surface area by up to 13%. Gas sensing properties of H-terminated NCD device show high sensitivity towards oxidizing species where the surface conductivity is increased by an order of magnitude for humid air and by three orders of magnitude for COCl2. The surface conductivity exhibits a small decrease to reducing spices (CO2, NH3). 相似文献
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