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  • 1
    Electronic Resource
    Electronic Resource
    Sintering of mixtures of powders of nickel and molybdenum (1968)
    Springer
    Powder metallurgy and metal ceramics 7 (1968), S. 699-703 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Mixtures of powders of carbonyl nickel and molybdenum for preparing cermet alloys are easily pressed and sintered and do not require any special measures for protection from oxidation during sintering (careful drying of hydrogen and use of covers). 2. Cermet nickel molybdenum alloys obtained from mixtures of dispersed powders are practically homogeneous after sintering for 1–2 h at 1473°K. The processes of homogenization take place more actively in alloys obtained from mixtures of powders than in cast alloys. 3. With increase in molybdenum content in the alloy, beginning from 25%, there is observed a decrease in the rate of increase in electrical resistance which is connected with a denudation of the solid solution with molybdenum because of precipitation of intermetallic phases. 4. The strength of the alloys increases with increase in concentration of molybdenum. The cermet alloy Ni-30 Mo sintered at 1473 °K has a strength of 60 kg/mm2 and an impact strength of 7.5 kgm/cm2. The decrease in strength and impact resistance for alloys of Ni-35% Mo sintered at 1473°K is explained by embrittlement of the material because of precipitation of intermetallic phases along the grain boundaries. 5. After sintering at temperatures of above 1500°K, alloys of Ni-35% Mo have a greater strength than Ni-30% Mo alloys. The decrease in strength of Ni-30% Mo and Ni-35% Mo alloys sintered at 1573°K, compared with alloys sintered at 1523 °K, is explained by embrittlement of the material because of the sharp increase in grain size at 1573°K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00773735
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  • 2
    Electronic Resource
    Electronic Resource
    Porous sintered fire supressors for the localization of acetylene-oxygen and hydrogen-oxygen flames (1967)
    Springer
    Powder metallurgy and metal ceramics 6 (1967), S. 699-701 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary A study was made of porous sintered tubular elements from nonspherical Kh17N2 stainless steel powders under critical conditions of gas flame processes. The critical values of the Peckle number were calculated; it was found that, for the acetylene-oxygen flame, the values of Pecr differ only little from a mean value of 65, while Pecr for the hydrogen-oxygen flame is 60. It is shown that sintered tubular elements from nonspherical stainless steel powders may be employed as fire supressors for quenching the acetylene-oxygen and hydrogen-oxygen flames in order to decrease hazards inherent in processes of gas flame treatment of metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00773488
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  • 3
    Electronic Resource
    Electronic Resource
    Porous permeable materials from a nickel-molybdenum alloy (1968)
    Springer
    Powder metallurgy and metal ceramics 7 (1968), S. 958-963 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions A study was carried out of the preparation of porous permeable materials from a Ni-30% Mo alloy by the techniques of sintering fine powders with the use of fillers and of sintering granulated powders. A technology has been developed for producing two-layer filters from the Ni-30% Mo alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00773431
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  • 4
    Electronic Resource
    Electronic Resource
    High-temperature strengths and corrosion resistances of porous materials made from granulated Cr and Cr-30 Ni powders (1968)
    Springer
    Powder metallurgy and metal ceramics 7 (1968), S. 152-155 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Porous material of granulated Cr-30Ni powder has a higher strength at low and high temperatures than materials of pure Cr and at high temperatures its strength is virtually equal to that of Kh23N18 heatresisting steel (with the same porosity). 2. Porous material of Cr-30Ni has a higher corrosion resistance in liquid aggressive media than material of pure Cr and is also resistant in HNO3 and H2SO4 solutions. 3. Porous material of granulated Cr-30Ni powders has a higher cinder resistance at 1373°K than Cr, Ni, and Kh23N18 stainless steel. 4. From their study of the properties of porous material made from coarse Cr-30Ni powder, the authors recommend its use as a permeable material in high-temperature oxidizing gases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00774312
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of densification kinetics during the sintering of reduced chromium powder (1966)
    Springer
    Powder metallurgy and metal ceramics 5 (1966), S. 782-788 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Chromium powder in a deformed condition contains no substantial type II distortions; this points to a low ductility of the strating reduced chromium powder. 2. Thermodynamic calculations and experiments demonstrate that chromium oxides may be reduced under the usual sintering conditions in hydrogen with a dew point of 253–243°K (between −20 and −30°C) at 1473°K. 3. The experimentally determined energy of activation for the densification process of chromium powder at the initial instant of sintering in hydrogen in the 1373–1473°K is 134±8.3 kj/mole (32±2 kcal/mole), which is equal to 0.43 of the energy of activation for volume self-diffusion (Evol). 4. The fact that sintering durations obtained by calculation on the basis of phenomenological theory are longer than the experimental values and that the energy of activation for the shrinkage of chromium is lower than Evol indicates that the densification of active reduced chromium powder at the initial stages of sintering is not governed by the volume-viscous flow mechanism. 5. Without diminishing the role played by boundary and surface diffusion, it is necessary to note that the mechanism of activated dislocation slip under the influence of capillary forces may play an important part in the densification process of reduced chromium powder at the early stages of sintering; this is indicated by the circumstance that the value of the energy of activation for dislocation intersection is similar to that for the shrinkage of chromium powder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00776247
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  • 6
    Electronic Resource
    Electronic Resource
    Filtering properties of twin-layer sintered filters (1966)
    Springer
    Powder metallurgy and metal ceramics 5 (1966), S. 541-544 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary 1. At equal filter thickness, twin-layer sintered filters from nonspherical powder have a much superior combination of filtration qualities (permeability and purification fineness) compared with filters made entirely from the same powder. 2. The dependence of permeability on resistance for twin-layer filters obeys Darcy's law within the limits investigated; for short filtration periods, permeability and purification fineness are the same irrespective of which of the two layers faces the oncoming fluid stream. 3. It is shown that the service life (period of operation before clogging) of twin-layer filters is longer when the filters are placed so that their coarse-fraction powder layer faces the fluid stream; filters arranged during operation with their fine-fraction powder layer against the fluid stream were found to exhibit better regeneration characteristics. 4. It is shown that filters from nonspherical powders can very effectively be regenerated by ultrasonic treatment, but not by the method of counter-blowing (at pressure drops of up to 1.5 MN/m2). 5. For a given filtration fineness, a twin-layer filter has a much longer service life (to clogging) than a filter made from powder of one fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00780112
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  • 7
    Electronic Resource
    Electronic Resource
    Filtering properties of porous materials from nonspherical powders (1968)
    Springer
    Powder metallurgy and metal ceramics 7 (1968), S. 546-550 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The results are presented of a study of sintered filters from nonspherical powders. It is shown that the optimum combination of permeability and stopping power is attained with high-porosity filters produced from powders with fine particles, the actual choice of a powder fraction being governed by the necessary stopping power. 2. It was established that the permeability coefficient of sintered filters pressed from nonspherical powder substantially increases with increasing filter thickness, which is due to the presence of a densified surface layer. The dependence of the permeability coefficient on filter thickness is more pronounced in the case of filters pressed from powders of lower apparent density. 3. It is shown that the stopping power of filters is independent of specimen thickness (over the 2–8-mm range investigated). An exception are filters of 55% porosity produced from a 0.28–0.36-mm powder fraction, whose stopping power becomes greater with increasing thickness. 4. Studies of the sludge-holding capacity of filters from nonspherical powders demonstrated that, depending on whether filtration is controlled by a volume of surface mechanism, different laws govern the increase in the resistance of filters operating in a contaminated fluid. The rate of rise in the resistance of operating filters increases with decreasing specimen thickness and porosity. 5. Assessment of regeneration power on the basis of the extent to which the starting sludge-holding capacity of filters is restored is clearly more appropriate than other techniques. Ultrasonic cleaning restores 90% or more of the starting sludge-holding capacity of filters from nonspherical powders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00774702
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  • 8
    Electronic Resource
    Electronic Resource
    Volume deformation and the variation of physical and mechanical properties of the TiFe-Cu(Ni) composite materials during hydrogenation (1993)
    Springer
    Powder metallurgy and metal ceramics 32 (1993), S. 249-255 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00559758
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  • 9
    Electronic Resource
    Electronic Resource
    Stability of hydrogen absorption for composite materials based on hydrogenating intermetallics (1993)
    Springer
    Powder metallurgy and metal ceramics 32 (1993), S. 303-307 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract On the basis of studies factors are established which reduce the level and stability of the adsorption activity of a TiFe-Ni composite such as interphase reaction of intermetallic with metal during composite sintering and the passivating effect of oxygen impurity in the metal phase. In order to reduce the effect of these factors to a minimum it is possible to recommend optimizing the amount of interphase surface in the composite and maximum refining of the metal phase with respect to oxygen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00560014
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  • 10
    Electronic Resource
    Electronic Resource
    Sintering and properties of porous compacts from granulated powders of chromium and chromium base materials (1967)
    Springer
    Powder metallurgy and metal ceramics 6 (1967), S. 552-557 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Granulated Cr and Cr + 30% Ni powders can be obtained by milling strip rolled from mixtures of fine Cr and Cr + 30% Ni powders with 5% paraffin wax. 2. Granulated Cr and Cr + 30% Ni powders exhibit good consolidation characteristics, and their moldability is sufficient for the production of filter parts. 3. Shrinkage during the sintering of compacts from granulated powders is practically independent of the starting intergranular porosity and is governed by the magnitude of shrinkage of the porous granulated particles (with the exception of Cr + 30% Ni powders with a granule size of −0.3 + 0.15 mm, whose shrinkage increases with increasing intergranular porosity). 4. After the sintering of compacts from granulated Cr powders, the granules have a substantial residual porosity, while Cr + 30% Ni powder granules become practically nonporous after sintering. 5. During the sintering of granulated Cr and Cr + 30% Ni powders, the starting intergranular porosity of compacts is retained (in spite of the high shrinkage of Cr + 30% Ni compacts), i. e., no significant intergranular shrinkage takes place. 6. The temperature required for effective sintering is 1523–1573° K for porous compacts from granulated Cr powders and 1373° K for compacts from granulated Cr + 30% Ni powder. 7. Granulation markedly increases the permeability of porous materials obtained from fine Cr and Cr + 30% Ni powders compared with the permeability of specimens produced from the fine powders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00774072
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