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  • 1
    Electronic Resource
    Electronic Resource
    Über die Inhibitorwirkung der Sorbinsäure (1987)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 38 (1987), S. 73-76 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The inhibitory effect of sorbic acidSorbic acid is utilized as a fungicidal and antimicrobial preservative. The structure of the sorbic acid molecule containing two double bonds together with a carboxyl group suggests an inhibitory effect on the dissolution of metals in acids.In view of the use of sorbic acid in the packing industry, its effect on the acid corrosion of aluminium, iron and tin was examined. Its inhibitory action was proven by means of dissolution tests and potentiokinetic measurements. Concentrations of 1 to 2 g/kg, applied in conservation, cause predominantly inhibition of metal corrosion in hydrochloric acid, sulfuric acid and acetic acid. Lower concentrations may stimulate the dissolution of the metals.
    Notes: Sorbinsäure wird als fungistatischer und antimikrobieller Konservierungsstoff eingesetzt. Der strukturelle Aufbau des Sorbinsäuremoleküles mit zwei Doppelbindungen in Kombination mit der Carboxylgruppe läßt eine inhibierende Wirkung bei der Metallauflösung in Säuren erwarten.Im Hinblick auf die Verwendung in der Konservenindustrie wurde die Wirkung der Sorbinsäure auf die Säurekorrosion der Metalle Aluminium, Eisen und Zinn untersucht. Löseversuche, ergänzt durch potentiokinetische Messungen, bestätigten die Erwartung. In den Korrosionsmedien Salzsäure, Schwefelsäure und Essigsäure wirken die bei der Konservierung angewendeten Konzentrationen von 1 bis 2 g/kg vorwiegend inhibierend auf die Metallkorrosion, während niederere Konzentrationen die Metallauflösung stimulieren können.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19870380204
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  • 2
    Electronic Resource
    Electronic Resource
    Effective Young's moduli of quasilayered bars using bar resonance frequencies (1999)
    Springer
    Journal of materials science 34 (1999), S. 3647-3652 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Rectangular-bar specimens with nonhomogeneous (quasilayered) porosity distribution were prepared from an iron powder. Using these specimens, differences were observed in effective Young's modulus values determined experimentally by means of specimen flexural vibrations with bending in the plane of quasilayers and in the plane perpendicular to quasilayers. To account for these differences, general expressions for resonance frequencies of flexural vibrations of model quasilayered bars were derived in a theoretical way. The model quasilayered bar means a prismatic bar of rectangular cross section, with material Young's modulus varying continuously only along one of transverse directions. Substituting theoretical resonance frequencies, instead of experimentally measured ones, into the routine evaluation procedure of the dynamical resonant method, theoretical values of effective Young's modulus were calculated. In majority of theoretically investigated simple model examples with lowered modulus of surface regions the effective modulus determined by means of the frequency of sample flexural vibration perpendicular to layers is lower than the effective modulus determined by means of the vibration parallel to the layers. These theoretical results explain qualitatively the effective modulus differences obtained for our quasilayered samples in an experimental way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004643103597
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  • 3
    Electronic Resource
    Electronic Resource
    Embrittlement of tungsten heavy alloys by trace impurities and their analytical characterization (1989)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 333 (1989), S. 417-421 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The effects of various trace elements on properties and fracture modes of heavy alloys are described. It has been found that tungsten heavy alloys can be embrittled by traces of Al, Si and P, while various other impurities are ineffective. In all cases embrittlement is caused by deterioration of the interfacial strength between binder and W grains. Al is not embrittling itself but preserves the oxygen, which is the embrittling element. Fractography by SEM is recommendable for correctly assessing the significance of the AES results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572341
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  • 4
    Electronic Resource
    Electronic Resource
    Interface distribution analysis of P in W-NiFe-alloys with SIMS (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 831-836 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Microdistribution analysis with SIMS was applied to investigate the segregation mechanism of P in heavy metal alloys. Since P is present in the W-NiFe-alloy as a trace element, analytical techniques for high lateral resolution distribution analysis with maximum sensitivity were developed. This allows the measurement of the distribution of P across grain boundaries and individual phases with a spatial resolution of 1.4 μm down to the low μg/g-range. Analysis of samples sintered at 1540° C and cooled at different rates showed that P concentrations up to 100 μg/g in 96% W heavy metal remain in solid solution whereas excessive phosphorus is precipitated preferentially at the W-NiFe interfaces, this segregation being the more pronounced the lower the cooling rate. A good correlation of P enrichment at the W-NiFe-interfaces with the mechanical properties of the heavy metals was found [3].
    Notes: Zusammenfassung Die Mikrobereichs-Verteilungsanalyse mit SIMS wurde zur Aufklärung des Segregationsmechanismus von P in Schwermetallen eingesetzt. Da P in W-NiFe-Legierungen nur als Spurenelement auftritt, mußten analytische Techniken für die Verteilungsanalyse mit hohem lateralen Auflösungsvermögen und maximaler Empfindlichkeit entwickelt werden. Durch eine chemische Oberflächenreaktion mit O2 während des Sputterns konnte eine Verbesserung der Signalintensität um drei Größenordnungen erzielt werden. Dies ermöglichte es, die Verteilung von P entlang der Korngrenzen und verschiedenen Phasen mit einer lateralen Auflösung von 1,4 μm bis in den unteren μg/g-Bereich zu studieren. Die Analyse von bei 1540° C gesinterten und verschieden abgekühlten Proben erlaubte es zu zeigen, daß P-Konzentrationen bis 100 μg/g im 96%-W Schwermetall in fester Lösung verteilt sind, wogegen größere P-Mengen bevorzugt an der Phasengrenze W-NiFe ausgeschieden werden. Diese Segregation ist um so ausgeprägter, je langsamer die Proben abgekühlt werden. Insgesamt wurde eine gute Übereinstimmung zwischen den P-Anreicherungen an der W-NiFe-Korngrenze mit den mechanischen Eigenschaften der Schwermetalle erzielt [3].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01226781
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  • 5
    Electronic Resource
    Electronic Resource
    Einfluß von Sauerstoffspuren auf die Eigenschaften von Wolfram-Schwermetallen (1984)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 15 (1984), S. 96-102 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of Oxygen Traces on the Properties of Tungsten Heavy MetalsInvestigation carried out with differently sintered W heavy metals showed that careful pre-reduction before liquid phase sintering is essential for obtaining satisfactory mechanical properties; otherwise oxide layers at the phase boundaries deteriorate the interface strength and thus cause premature fracture. Understandably, the water vapour content of the furnace atmosphere is of considerable importance. Appropriate sintering anticipated, even severely oxidized green compacts result in highly ductile heavy metals. Addition of scavengers, e.g. Cr or V, instead of the pre-reduction improves the interface strength, the mechanical properties however remain unsatisfactory.
    Notes: Untersuchungen an nach verschiedenen Zyklen gesinterten Schwermetallen zeigten, daß sorgfältige Reduktion vor dem Flüssigphasensintern notwendig ist, um die beträchtlichen Ausgangsmengen an Sauerstoff zu entfernen; andernfalls werden aufgrund der durch Oxidbelegung verschlechterten Haftfestigkeit zwischen W-Körnern und Binderphase nur sehr schlechte mechanische Eigenschaften erhalten. Der Wassergehalt der Ofenatmosphäre spielt naturgemäß eine bedeutende Rolle; bei richtiger Führung der Sinterung werden auch von stark oxidierten Grünlingen ausgezeichnete Schwermetalle erhalten. Zusatz von Scavengern, wie Cr oder V, anstatt der Vorreduktion verbessert zwar die Haftung der Phasen, die Eigenschaften bleiben aber unbefriedigend.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19840150306
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  • 6
    Electronic Resource
    Electronic Resource
    Production of stainless steel filters by liquid phase activated Gravity sintering (1988)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 19 (1988), S. 205-211 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Herstellung von Filtern aus rostfreiem Stahl durch flüssigphasenaktivierte SchüttsinterungFilter aus Rostfreistahl können nicht ohne weiteres durch Schüttsinterung hergestellt werden, da die Oxidhäute auf den Pulverpartikeln die Bildung von Sinterbrücken verhindern. Durch Zusatz von Borverbindungen, v.a. NiB und BN, wird die Sinterung durch Reduktion der Oxidhäute und Bildung flüssiger Phase aktiviert. Die so gesinterten Filter weisen neben hervorragenden mechanischen Eigenschaften, v.a. hoher Duktilität, gute Durchströmbarkeit auf, während die Korrosionsbeständigkeit durchaus mit der von borfreien Rostfreistählen vergleichbar ist.
    Notes: Production of stainless steel filters by sintering the loose powders offers difficulties due to the stable oxide layers covering the particles and preventing formation of sintering necks. Boron compounds, i.e. NiB and BN, were found to activate sintering by both reducing the oxide layers and forming a liquid phase. The resulting samples offer excellent mechanical properties, in particular high ductility, as well as satisfactory permeability, while the corrosion resistance is not lower than with boron-free stainless steels.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19880190607
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  • 7
    Electronic Resource
    Electronic Resource
    PM Aluminum Camshaft Belt Pulleys for Automotive Engines (1996)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 27 (1996), S. 179-189 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Sinteraluminium-Zahnriemenräder für KraftfahrzeugmotorenLeichte und gleichzeitig verschleißfeste Zahnriemenräder auf Al-Basis für Motoren wurden aus üblichen Al-Pulvermischungen mit Zusatz von harten Teilchen hergestellt. Beim Vergleich der Einlagerungen ergab sich der Zusatz von 10 Masse% ZrSiO4 als optimal. Aus der entsprechenden Mischung wurden Zahnriemenräder gepreßt, unter optimierten Bedingungen gesintert und kalibriert. Für die Verschleißpruüfung wurden sowohl Stift-Scheibe-Geräte als auch speziell entwickelte Zahnriemenradprüfstände verwendet. Die Al-Räder waren sowohl von den Dimensionen als auch der Verschleißbeständigkeit her durchaus mit üblichen Sintereisenrädern vergleichbar, mit Ausnahme eines gewissen Verschleißes des Riemens durch herauspolierte Teilchen nach sehr langen Prüfzeiten.
    Notes: Light and wear resistant Al camshaft belt pulleys for engines were produced from standard Al powder mixtures with addition of hard particles. Pre-screening tests of numerous inclusions showed 10 mass% ZrSiO4 to be the best choice. Full size belt pulleys were produced by pressing, sintering at optimized parameters, and sizing. Wear testing was carried out on pin-disc testers and special belt pulley testbeds. Both dimensional and wear properties were found to be well comparable to those of conventional iron pulleys, with the exception of some attack on the belt by protruding particles after prolonged testing.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19960270413
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  • 8
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    Modeling the response of physical and mechanical properties of Cr–Mo prealloyed sintered steels to key manufacturing parameters (2014)
    Elsevier
    Details
    Publication Date: 2014-03-01
    Print ISSN: 0261-3069
    Electronic ISSN: 1873-4197
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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  • 9
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    Characterisation of TiC–NiMo reinforced Ni-based hardfacing (2013)
    Elsevier
    Details
    Publication Date: 2013-12-01
    Print ISSN: 0257-8972
    Electronic ISSN: 1879-3347
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 10
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    Tribological performances of ZrC-Ni and TiC-Ni cermet reinforced PTA hardfacings at elevated temperatures (2017)
    Elsevier
    Details
    Publication Date: 2017-01-01
    Print ISSN: 0257-8972
    Electronic ISSN: 1879-3347
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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