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  • Articles  (17)
  • Chemistry  (17)
  • General Chemistry
  • 1985-1989  (17)
  • 1940-1944
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  • 1987  (17)
  • 1
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Eignung von ionenplattierten metallischen Schutzschichten auf Ti-6Al-4V bei Schwingungsverschleißbeanspruchung (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 67-73 
    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: Investigations on the Suitability of lon-Plated Metallic Coatings on Ti-6Al-4V at Fretting Fatigue LoadTo provide fretting fatigue damage flat specimens of the alloy Ti-6Al-4V were supplied with metallic coatings. For that purpose specimens were coated with Cu, Cr, V, Ti and with an Al/Cu-combination. These coated specimens were then tested in a fretting bridge equipment.It was found that all coatings except the Al/Cu-combination lead to considerable improvement of fretting fatigue life.As SEM-investigations show, a separation of the functions of specimen-body and specimen-surface was achieved by the coatings, so that the effectiveness of coatings of rather low wear-resistance is explicable.
    Notes: Zum Schutz vor Schwingungsverschleißschäden wurden Flachproben der Legierung Ti-6Al-4V mit metallischen Schutzschichten versehen. Dazu wurden die Proben mit Cu, Cr, V, Ti und durch einen Al/Cu-Verbund beschichtet. Die beschichteten Proben wurden dann in einer Reibkufenapparatur geprüft.Es zeigte sich, daß alle Beschichtungen außer dem Al/Cu-Verbund zu erheblichen Steigerungen der Probenlebensdauer bzw. -festigkeit führten.Wie rasterelektronenmikroskopische Untersuchungen ergaben, gelingt durch die Beschichtungen eine Trennung von Grundwerkstoff und Oberflächenfunktion, wodurch die Wirksamkeit der Beschichtungen von eher geringer Verschleißfestigkeit erklärbar wird.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870180304
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  • 2
    Electronic Resource
    Electronic Resource
    Eigenspannungen, Haftfestigkeit und Verschleißeigenschaften von gesputterten, amorphen Aluminiumoxidschichten (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 375-380 
    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: Internal Stresses, Adhesion and Wear Behaviour of Sputtered Amorphous Alumina CoatingsThin alumina coatings have been pruduced by means of reaktive r.f. magnetron sputtering. The layers, deposited onto metallic substrates, show an amorphous crystallographic structure which may be due to the low deposition temperatures below about 250°C.Measurement of internal stresses was performed by using the bending beam method. The experiments show that there is not only a dependence on the film thickness but even pressure and sputtering power have a strong influence on internal stresses of the alumina coatings. Some correlations between internal stress and adhesion of the coatings are evident.Besides scratch-test measurements the size of layer-detachment of bending-specimen gave information about the adhesion behaviour of the coatings. The results of both methods have been in good agreement.Some of the alumina coatings have been tested with regard to their tribological behaviour by means of a model testing apparatus. The coatings show excellent wear behaviour even under severe tribological conditions.
    Notes: Mit Hilfe des reaktiven Hochfrequenz-Magnetronkathodenzerstäubungsverfahrens wurden dünne Aluminiumoxidschichten auf Stahlsubstraten abgeschieden. Aufgrund der relativ niedrigen Substrattemperaturen (〈 etwa 250°C) zeigen die Schichten eine amorphe Röntgenstruktur.Messungen der Schichteigenspannungen, die mittels der Biegestreifenmethode durchgeführt wurden, zeigten, daß sowohl von der Schichtdicke als auch von Beschichtungsdruck und -leistung starke Einflüsse auf den Eigenspannungszustand ausgehen.Darüberhinaus konnten Abhängigkeiten zwischen Schichthaftungsverhalten und den inneren Spannungen der Schichten nachgewiesen werden.Neben dem Ritztestversuch diente das Ablöseverhalten der Schichten im Kerbschlagbiegeversuch als Haftungskriterium. Die Ergebnisse beider Verfahren befinden sich in guter Übereinstimmung.Einige der Schichten wurden ersten Verschleißuntersuchungen unterworfen. Die Schichten zeigten unter den gewählten Modellverschleißbedingungen ein gutes Verschleißverhalten.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870181107
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  • 3
    Electronic Resource
    Electronic Resource
    Selective removal of water in purge and cold-trap capmary gas chromatographic analysis of volatile organic traces in aqueous samples (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 60-66 
    Details
    ISSN: 0935-6304
    Keywords: Capillary gas chromatography ; Cold-trapping ; Drying ; Gas stripping ; Trace analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The design and features of an on-line purge and cold-trap pre-concentration device for rapid analysis of volatile organic compounds in aqueous samples are discussed. Excessive water is removed from the purge gas by a condenser or a water permeable membrane in order to avoid blocking of the capillary cold-trap. Synthetic mixtures covering concentrations ranging from tenths to tens of ppb's and different chemical classes are used to study the effect of various process factors on the efficiency and selectivity of water removal as well as on the purging recovery. The importance of the concentration of the solutes, the flow rate in conjunction with the volume of the purge gas, and the temperature of the condenser, the cold-trap and the sample is emphasized. Theoretical models describing the purge process and the blocking of the cold-trap agree fairly well with the highly reproducible experimental results (σ = 2-4%). Both the condenser and the Nafion membrane successfully remove water, although some compounds, dependent on volatility and polarity, are partly or completely lost. It is shown that non-polar volatile organic compounds are efficiently enriched so that recoveries between 80-100% and a detection limit of 1 ppt can be obtained. The applicability of the system is illustrated on some examples.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240100202
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  • 4
    Electronic Resource
    Electronic Resource
    Minimum column temperature required for concurrent solvent evaporation in coupled HPLC-GC (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 435-440 
    Details
    ISSN: 0935-6304
    Keywords: On-line coupled HPLC-GC ; Concurrent solvent evaporation ; Loop-type Interface ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Concurrent solvent evaporation using the loop-type HPLC-GC interface requires that the GC oven temperature be above the eluent boiling point at the given carrier gas inlet pressure in order to prevent eluent flowing into the GC capillary column. Corresponding oven temperatures representing minimum oven temperatures for eluent transfer were experimentally determined for solvents and solvent mixtures of interest for use as HPLC eluents. Evaluation of eluents for concurrent evaporation is discussed. Recommended lengths of uncoated column inlets (pre-columns) are derived from the mechanisms involved in solvent evaporation. Temperatures listed as minimum column temperatures for concurrently evaporating HPLC eluents are also useful for estimating maximum applicable column temperatures when working with the conventional retention gap or partially concurrent solvent evaporation techniques in coupled HPLC-GC.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240100803
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  • 5
    Electronic Resource
    Electronic Resource
    Liquid chromatographic trace enrichment with on-line capillary gas chromatography for the determination of organic pollutants in aqueous samples (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 17-24 
    Details
    ISSN: 0935-6304
    Keywords: Coupled LC-GC ; Retention gap ; LC trace enrichment ; Aqueous samples ; Organic pollutants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trace enrichment for the GC analysis of a series of chlorinated pesticides and polychlorinated biphenyls (PCBs) in aqueous samples has been achieved through a simple on-line technique involving sorption on an LC micro-precolumn followed by direct elution into a gas chromatograph with hexane. A 5-m retention gap coupled to the capillary GC column served as the recipient of a relatively large sample volume (ca. 100 μl) introduced into the GC. Partially concurrent solvent evaporation during sample introduction allowed a large sample capacity. Recoveries of more than 95% were observed for the majority of the compounds studied. Using 1.0 ml aqueous samples, detection limits of less than 1 ppt were found. The applicability of the developed method was demonstrated for a river water sample.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240100104
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  • 6
    Electronic Resource
    Electronic Resource
    GC/MS analysis of some eicosane isomers and their deuterated homologs (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 153-155 
    Details
    ISSN: 0935-6304
    Keywords: Mass spectrometry ; Hydrocarbon ; Radiation chemistry ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240100311
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  • 7
    Electronic Resource
    Electronic Resource
    On the effect of Temperature Cycling on the coating of a pack aluminized low alloyed steel (13 CrMo 44) (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 235-239 
    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: Zum Einfluß von Temperaturwechseln auf Pulveraluminierschutzschichten auf niedriglegiertem Stahl (13 CrMo 44)Duch Pulveraluminieren von niedriglegiertem Stahl kann gute Beständigkeit gegen Hochtemperaturkorrosion bis zu 700 °C erreicht werden, ohne daß Diffusionsprozesse schon zu einer Verarmung von Aluminium in der Probenoberfläche führen. Im normalen Hochtemperatureinsatz ist die Schutzschicht auch Temperaturwechseln unterworfen. In dieser Untersuchung wird berichtet, wie Pulveraluminierschutzschichten auf Temperaturwechsel zwischen 700 °C and Raumtemperatur bzw. Temperatur ds flüssigen Stickstoffs reagieren. Neben Rißbildung und -wachstum wird die Abhängigkeit der Mikrorißdichte von Zyklenzahl, Abkühlgeschwindigkeit und Probengeometrie beschrieben.
    Notes: Coated pack aluminized low alloyed steels are known for their good resistance against high temperature corrosion up to 700 °C, where diffusion stability is still sufficient. In typical high temperature applications, coating and substrate are subjected to thermal fatigue. In this study the metallurgical stability of a coated, pack aluminized, low alloyed steel is reported. The specimens were cyclically quenched from 700 °C to room temperature or liquid nitrogen temperature respectively, to assess the importance of thermal shock severity on the kinetic of degradation. In particular, crack initiation and growth were studied. The dependence of microcrack densities upon numbers of cycles, cooling rates and specimen geometry is reported.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870180711
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  • 8
    Electronic Resource
    Electronic Resource
    Informationen (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. A80 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870181003
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  • 9
    Electronic Resource
    Electronic Resource
    Struktur gesputterter amorpher Aluminiumoxidschichten (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 9-15 
    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: Structure of Sputtered Amorphous Alumina Coatings.In recent years PVD-hard coatings have found widespread application especially in the field of cutting tools.In order to optimise the coating process for a tool or component it is necessary to know about basical properties of coating material like hardness or adhesion and also about the coherences of deposition parameters and layer properties. Structure is one of these fundamental properties to influence the behaviour of a coating.R.f. sputtered alumina coatings have been investigated concerning their structure with regard to the parameters of deposition process and the sputter-precleaning conditions.Especially the sputtercleaning process influences the substrate surface and the growing-mechanisms of the coatings. In the same way the structure of the layers change with the composition of sputteratmosphere and the deposition pressure. Dependences between layer structure and tribological behaviour of the coatings are demonstrated.
    Notes: PVD-erzeugte Hartstoffschichten haben vor allem im Werkzeugsektor in den vergangenen Jahren verstärkt Eingang gefunden.Um die Beschichtung eines Werkzeugs oder Bauteils in geeigneter Weise gemäß den gegebenen Beanspruchungskomplexen optimieren zu können, ist es notwendig, genaue Kenntnisse über bestimmte Basiseigenschaften, wie Härte oder Haftfestigkeit sowie über die Wechselwirkungen zwischen den Abscheideparametern und den Schichteigenschaften zu gewinnen.Eine dieser Basiseigenschaften, die das Verhalten einer Schicht maßgeblich beeinflussen, ist deren Struktur. An gesputterten Aluminiumoxid-Schichten wurde die Schichtstruktur in Abhängigkeit von den Beschichtungs- und Vorreinigungsparametern untersucht.Insbesondere der durch das sogenannte Sputtercleaning beeinflußte Oberflächenzustand der Substrate beeinflußt das Aufwachsverhalten der Schichten in starkem Maße. Darüber hinaus konnten die Auswirkungen von Beschichtungsdruck und Sputteratmosphäre auf die Schichtstruktur gezeigt werden.Am Beispiel eines Verschleißversuches werden die Abhängigkeiten zwischen Schichtstruktur und Schichtverhalten unter tribologischer Beanspruchung dargestellt.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870180106
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  • 10
    Electronic Resource
    Electronic Resource
    Ultrasonic and hypersonic dispersion in polysiloxanes (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 25 (1987), S. 749-763 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We report ultrasonic attenuation and velocity measurements on poly(dimethylsiloxane) (PDMS), poly(phenylmethyl siloxane) (PPMS), and copolymer poly(dimethyl phenylmethyl siloxane) in the temperature range of 10-50°C and frequency 0.3-45 MHz. The present data complement previously reported Brillouin spectra at hypersonic frequencies. Whereas the ultrasonic velocity u0 is virtually independent of frequency, the ultrasonic absorption exhibits strong dispersion which can be ascribed to the viscoelastic normal mode relaxation. The ultrasonic attenuation data for PPMS at low temperatures display an additional relaxation process related to localized segmental motion. This mode is also responsible for the relatively large dispersion of the sound velocity and attenuation in the gigahertz frequency range accessible to the Brillouin scattering experiment. The extended information, which can be extracted by studying hypersonic dispersion, is discussed in detail.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1987.090250405
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