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1.
2.
V. V. Skorokhod N. K. Prokushev I. O. Shmatko 《Powder Metallurgy and Metal Ceramics》1987,26(11):875-880
Conclusions A method is proposed making it possible to study the high-temperature kinetics of the variation of the coefficients of shear ductility of a porous solid and its material during sintering under pressure. An investigation was carried out into the variation of the ductility of copper powder compacts in the temperature range 700–950°C. Experimental data are compared with results obtained on the basis of the theory of diffusion-viscous flow and a general rheological theory of sintering. It has been established that in the initial stage of sintering at 950°C the coefficient of shear ductility of copper increases linearly with time. Under conditions of diffusion-viscous flow of a polycrystalline material, this is due to diffusional grain growth according to a parabolic law. It is shown that experimental values of shear ductility of copper are smaller than values obtained on the basis of the rheological theory of sintering. Values approximating most closely to experimental data have been obtained with a model of an ideal porous solid.Translated from Poroshkovaya Metallurgiya, No. 11(299), pp. 11–17, November, 1987. 相似文献
3.
V. V. Skorokhod M. B. Shtern A. V. Kuz’mov A. V. Ragulya 《Powder Metallurgy and Metal Ceramics》2006,45(5-6):221-225
A study has been made on the effects of loading scheme and conditions restricting macroscopic strain on the work-hardening
kinetics and strain accumulation in the solid state in sintering materials with bimodal pore size distributions. Active loading
intensifies the reduction in the small pores. The greatest effect comes from combining sintering with hydrostatic compression.
At the same time, kinematic constraints (partial or complete adhesion in surfaces) substantially retards the shrinkage of
large pores, which means that the porous structure can be controlled.
__________
Translated from Poroshkovaya Metallurgiya, Nos. 5–6(449), pp. 10–15, May–June, 2006. 相似文献
4.
O. V. Konstantinova A. V. Kuz’mov V. V. Skorokhod M. B. Shtern 《Powder Metallurgy and Metal Ceramics》2007,46(1-2):25-31
A theoretical method for determining the percolation limit and effective conductivity of composites based on polydisperse
mixtures of insulator and conductor powders is proposed. The effect of the particle size ratio between the insulator and conductor
on the percolation limit and effective conductivity is studied. Numerical simulation of the microstructure, effective properties,
and percolation limit in composites is discussed.
__________
Translated from Poroshkovaya Metallurgiya, Vol. 46, No. 1–2(453), pp. 31–40, 2007. 相似文献
5.
Maya D. Glinchuk Vladislav Skorokhod Igor Bykov Vilnis Dimza Eva erno kova Toma Kala 《Ferroelectrics Letters Section》1994,18(5):191-196
X-band EPR spectra of PLZT 1/65/35 and PLZT 8/65/35 doped with 1% FE3+ were recorded at temperature range -175°C to 200°C. Three types of paramagnetic centers were found. Two of them are in strong axial and rhombic crystal field due to neighboring oxygen and lead vacancies. The other center has symmetry determined by polarization and oxygen octahedra tilt. EPR spectra of PLZT 8/65/35 are in agreement with its glassy behavior. 相似文献
6.
E. S. Chernikova I. I. Timofeeva I. V. Uvarova A. I. Bykov V. V. Skorokhod V. P. Smirnov 《Powder Metallurgy and Metal Ceramics》1998,37(5-6):265-269
This paper describes the mechanical alloying of Ti and C powders by intensive grinding in a planetary mill. The effect of
milling conditions and initial composition on the compositional homogeneity and properties of powders and samples consolidated
by hot-pressing was studied by x-ray diffraction, scanning electron microscopy, and surface area measurement. The diffraction
patterns indicated that a powder mixture ground for 24 hours transforms to TiC after sintering for only one minute at 600°C
under a pressure of 3 GPa.
Materials Science Instiute, Ukrainian Academy of Sciences, Kiev. Translated from Poroshkovaya Metallurgiya, Nos. 5–6, pp.
32–38, May–June, 1998. 相似文献
7.
L. B. Khoroshavin Yu. D. Syreishchikov S. D. Skorokhod 《Refractories and Industrial Ceramics》1964,5(5-6):289-294
Summary To reduce the sliding of fettling powders from the slopes of electric furnaces, it is desirable to use powders with not more than 10% of the fraction finer than 0.088 mm, and the SiO2 content should be about 4.5–6%. Addition to the magnesite powder of coarse dolomite fraction 15-0.5 mm, and also 6–7% coal tar pitch, reduces the mobility of the powders.The rational composition of metallurgical powders used for fettling slopes and hearths of electric arc furnaces largely depends on the grade of steel being melted.The increase in the life of the slopes and hearths of an electric furnace in which stainless steel was being melted, fettled with MPMZ powder, was due to the increase in the content of periclase bonded with melilite and mervinite in the slopes and melilite and forsterite in the hearths.During the melting of steel of changing sorts, the increase in the life of the slopes and hearths, fettling with magnesite-dolomite powders is due to the presence of crystals of periclase bonded mainly with highly refractory dicalcium silicate.When fettling is done with MPMZ powder the structure of the slopes and hearths is identical. The use of chromemagnesite, magnesite-chromite and magnesite-dolomite powders give rise to the formation of a heterogeneous structure in the slopes and hearths which leads to their irregular wearing away.To prolong the service of the hearths and slopes of electric furnaces it is necessary to continue investigating the wear resistance of fettling materials in furnaces of different capacities, where steels of different types are being melted, typifying the life of the powders by the consumption per ton of steel melted, the burn-out profile of the lining, the interrepair periods and other factors. 相似文献
8.
Nizhenko Valentin I. Skorokhod Valerii V. 《Powder Metallurgy and Metal Ceramics》2004,43(7-8):364-370
A kinetic equation for compaction with liquid-phase sintering is found on the basis of rheological sintering theory. Kinetic coefficients of the equation are determined from physicochemical properties of a dispersed system and its components. Compaction kinetics are studied for the system W – Ni – Sn where the liquid phase is eutectic alloy Ni – Sn with the greatest nickel content. It is shown that experimental results are in good agreement with those obtained by the kinetic equation on the coordinates porosity – time. Diffusion coefficient is evaluated for tungsten in melt (67.5 mass% Ni + 32.5 mass% Sn): at 1200°C it is 0.113·10–5 cm2/sec for grain diameter L 0 = 3 μm. Time dependences are also obtained for the compaction rate and viscosity of the pseudoalloys studied. 相似文献
9.
10.
Oleg Vasylkiv Yoshio Sakka Valeriy V. Skorokhod 《Journal of the American Ceramic Society》2003,86(2):299-304
The 1.5- to 3-mol%-Y2 O3 -stabilized tetragonal ZrO2 (Y-TZP) and Al2 O3 /Y-TZP nanocomposite ceramics with 1 to 5 wt% of alumina were produced by a colloidal technique and low-temperature sintering. The influence of the ceramic processing conditions, resulting density, microstructure, and the alumina content on the hardness and toughness were determined. The densification of the zirconia (Y-TZP) ceramic at low temperatures was possible only when a highly uniform packing of the nanoaggregates was achieved in the green compacts. The bulk nanostructured 3-mol%-yttria-stabilized zirconia ceramic with an average grain size of 112 nm was shown to reach a hardness of 12.2 GPa and a fracture toughness of 9.3 MPa·m1/2 . The addition of alumina allowed the sintering process to be intensified. A nanograined bulk alumina/zirconia composite ceramic with an average grain size of 94 nm was obtained, and the hardness increased to 16.2 GPa. Nanograined tetragonal zirconia ceramics with a reduced yttria-stabilizer content were shown to reach fracture toughnesses between 12.6–14.8 MPa·m1/2 (2Y-TZP) and 11.9–13.9 MPa·m1/2 (1.5Y-TZP). 相似文献