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  • Articles  (10)
  • structure  (10)
  • 2020-2024
  • 2000-2004  (10)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (10)
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  • Articles  (10)
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Keywords
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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and Structure of a Novel Mg6 Cluster Molecule Mg6(μ3-OH)2(μ3-Br)2(μ-Br)8(THF)8 (2000)
    Springer
    Journal of cluster science 11 (2000), S. 253-260 
    Details
    ISSN: 1572-8862
    Keywords: magnesium ; cluster ; hydroxide ; structure ; fluxionality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A novel Mg6 cluster molecule with the formula of Mg6(μ 3-OH)2(μ 3-Br)2(μ-Br)8(THF)8 (1) has been isolated in 38% yield from a reaction of the Grignard reagent, 2-naphthyl-Mg-Br with BBr3 in THF. The structure of 1, determined by a single-crystal X-ray diffraction analysis, contains two Mg3 triangles linked together by two bridging bromide ligands. Within each Mg3 triangle, one hydroxide and one bromide ligand function as triply bridging ligands capping both sides of the Mg3 triangle. The coordination geometry around each Mg(II) ion is approximately octahedral. NMR studies revealed that compound 1 is highly fluxional in solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009033303026
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  • 2
    Electronic Resource
    Electronic Resource
    High-Temperature Oxidation Behavior of the Co-Base Superalloy DZ40M in Air (2000)
    Springer
    Oxidation of metals 53 (2000), S. 351-360 
    Details
    ISSN: 1573-4889
    Keywords: Co-base superalloy ; high-temperature oxidation ; kinetics ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation behavior of the Co-base superalloy DZ40M was studied in air at900–1100°C for times of up to 2000 hr. The results indicated thatthis alloy can grow a protective oxide scale at 900 and 1000°C duringisothermal oxidation, but not at 1100°C because of serious cracking andspalling of the oxide scales. Moreover, an internal-precipitate zone formedin the subsurface region of the alloy at all temperatures and times. Theprecipitates were rich in Cr in the vicinity of the alloy–scaleinterface and rich in Al deep in the alloy. The internal-precipitatemorphology changed from a granular to needlelike shape with increasingoxidation temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004597405809
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  • 3
    Electronic Resource
    Electronic Resource
    Structural Changes in the Surface Friction Layer of a Polymeric Endoprosthesis Cup (2000)
    Springer
    Mechanics of composite materials 36 (2000), S. 365-372 
    Details
    ISSN: 1573-8922
    Keywords: polymeric insert ; structure ; friction coefficient ; porous layer ; hip joint endoprosthesis ; cartilage ; synovia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A concept of creation of a polymeric insert for hip joint endoprostheses with the physiological and biomechanical properties typical of natural cartilage is proposed. The spherical friction surface of the insert is coated with a microporous layer imitating cartilage. This layer carries an electret charge, which improves the lubrication of the endoprosthesis with synovia and serves as a carrier of drugs, thus ensuring their prolonged discharge into the operation wound. Tribotechnical characteristics of an endoprosthesis with such an insert are investigated. It is shown that a drop in the friction coefficient of such a pair is accompanied by a change in the microrelief of the friction surface and in the degree of crystallinity of the material of the porous layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026690932391
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and Sintering of Nanocrystalline Barium Titanate Powder under Nonisothermal Conditions. Part V. Nonisothermal Sintering of Barium Titanate Powders of Different Dispersion (2000)
    Springer
    Powder metallurgy and metal ceramics 39 (2000), S. 395-402 
    Details
    ISSN: 1573-9066
    Keywords: nanocrystalline barium titanate ; nonisothermal sintering ; rate-controlled sintering ; high-pressure sintering ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A comparative study has been made of the processes involved in the consolidation of nanosized barium titanate powders by nonisothermal sintering at a linear heating rate, by rate-controlled sintering, and high-pressure sintering (up to 5 GPa). The use of linear heating and high-pressure has been found to be ineffective for obtaining nonporous ceramics (residual porosity of about 2%) and for miniziming grain growth. The application of external pressure does not prevent coalescent grain growth controlled by surface diffusion. When rate-controlled sintering is employed a densification/grain growth optimum can be attained with a relative density of 99.9% of the theoretical value and a grain size of about 100 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026669724386
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  • 5
    Electronic Resource
    Electronic Resource
    Structural Features and Properties of Alloy 84% WC ― 16% Co, Obtained by Hot Pressing in the Solid and Liquid Phases. Part 1. Effect of the Temperature at which the Specimens are Prepared on Their Density and Structure (2000)
    Springer
    Powder metallurgy and metal ceramics 39 (2000), S. 607-617 
    Details
    ISSN: 1573-9066
    Keywords: hot pressing ; sintering ; solid phase ; annealing ; density ; structure ; particle size ; tungsten carbide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Studies are made of changes in the porosity and structure of a hard alloy obtained by hot pressing and sintering within a broad range of temperatures (950-1450°C). The effect of solid- and liquid-phase annealing on their porosity and structure is also examined. It is shown that the hot-pressed specimens are denser than the sintered specimens within the solid-phase region, other conditions being equal. Solid-phase annealing of hot-pressed and sintered specimens increases the density of both types of specimens, but the annealing operation is more effective in the former case. It is established that the open pore channels are 2-3 times smaller in the hot-pressed specimens than in the sintered specimens and are no larger than the average size of the tungsten carbide particles. Active growth of the carbide particles and redistribution of the ductile phase are observed even in the solid phase. The carbide particles grow considerably faster (by a factor of four) at sintering temperatures above 1200°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011388400293
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Pore Space Structure on Deformation Energy Absorption during Compression of Highly Porous Composites. Part II. Intense Hardening Stage (2000)
    Springer
    Powder metallurgy and metal ceramics 39 (2000), S. 498-503 
    Details
    ISSN: 1573-9066
    Keywords: porous material ; damping ; strain hardening ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A method is suggested for analytical determination of the optimum structure for highly porous material according to the criterion of minimum deformation stress. It is shown that calculation by the minimum stress criterion makes it possible to obtain in the optimum structural state a lower damping stress with greater work for deformation. Calculations are in good agreement with experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011326808789
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  • 7
    Electronic Resource
    Electronic Resource
    Cemented Carbides Alloyed with Ruthenium, Osmium, and Rhenium (2000)
    Springer
    Powder metallurgy and metal ceramics 39 (2000), S. 428-433 
    Details
    ISSN: 1573-9066
    Keywords: cemented carbide ; structure ; physico-mechanical properties ; ruthenium ; osmium ; rhenium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A study was made of the structure and mechanical properties of WC ― Co cemented carbides alloyed with Ru, Re, and Os. It was shown that the alloying elements form solid solutions with the binder phase, Co(Ru, W, C), Co(Re, W, C), Co(Os, W, C), which have higher microhardnesses and elastic moduli than the solid solution Co(W, C). Ruthenium, rhenium, and osmium reduce the stacking fault energy of the cobalt phase and promote the transformation of the cubic modification of cobalt to the hexagonal. This results in precipitation hardening of the binder phase. Additions of Ru, Re, and Os increase the hardness, and bend, compression and yield strengths, of WC ― Co alloys. Examples of the successful use of WC ― Co cemented carbide tools alloyed with noble metals for the machining of heat-resistant alloys and high-alloy steels are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011306204246
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  • 8
    Electronic Resource
    Electronic Resource
    The Effect of a Pulse Current Supply on the Structure and Magnetic Properties of Highly Dispersed Iron (2000)
    Springer
    Powder metallurgy and metal ceramics 39 (2000), S. 525-527 
    Details
    ISSN: 1573-9066
    Keywords: pulse electrolysis ; finely dispersed iron powder ; structure ; magnetic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The paper examines how a pulse current supply affects the formation of highly dispersed iron powder particles. We determine the optimum current pulse frequency (104-103Hz), the ratio of the amplitude of the nucleation current to the amplitude of the crystal growth current (I n/I g = 5:25) and the optimum ratio of the nucleation time to the crystal growth time (τn/τg = 1:10). The effect of the pulsed current manifests itself in decrease in dendricity, i.e., a reduction of the particle anisotropy, and has little impact on the powder dispersity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011397608954
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Structure and Composition on the Hardness of Sintered Composites Based on Stainless Steels (2000)
    Springer
    Powder metallurgy and metal ceramics 39 (2000), S. 603-606 
    Details
    ISSN: 1573-9066
    Keywords: hardness ; powder composite ; structure ; dispersed inclusions ; stainless steel ; chromium carbide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A phenomenological model is constructed to describe the hardness of a composite material based on stainless steels. The effect of the structure and the content of dispersed inclusions on the hardness of such composites is studied. The adequacy of the model is checked on test specimens made of stainless steel Kh18N15 containing 0.6% carbon and 10-30% dispersed inclusions of chromium carbide. The model makes it possible to not only evaluate the reinforcing effect of fine inclusions, but also to optimize that effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011336416223
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  • 10
    Electronic Resource
    Electronic Resource
    Topology optimization design of continuum structures under stress and displacement constraints (2000)
    Springer
    Applied mathematics and mechanics 21 (2000), S. 19-26 
    Details
    ISSN: 1573-2754
    Keywords: structure ; optimization ; topology optimization ; modeling ; dual programming ; O223 ; TU323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract Topology optimization design of continuum structures that can take account of stress and displacement constraints simultaneously is difficult to solve at present. The main obstacle lies in that, the explicit function expressions between topological variables and stress or displacement constraints can not be obtained using homogenization method or variable density method. Furthermore, large quantities of design variables in the problem make it hard to deal with by the formal mathematical programming approach. In this paper, a smooth model of topology optimization for continuum structures is established which has weight objective considering stress and displacement constraints based on the independent-continuous topological variable concept and mapping transformation method proposed by Sui Yunkang and Yang Deqing. Moreover, the approximate, explicit expressions are given between topological variables and stress or displacement constraints. The problem is well solved by using dual programming approach, and the proposed element deletion criterion implements the inversion of topology variables from the discrete to the continuous. Numerical examples verify the validity of proposed method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458535
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