ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • 1965-1969  (5)
Sammlung
Verlag/Herausgeber
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Calculations for nitriding with diluted ammonia (1966)
    Springer
    Metal science and heat treatment 8 (1966), S. 395-403 
    Details
    ISSN: 1573-8973
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Conclusions 1. The simplest and cheapest method consists in using the gases formed during nitriding for repeated nitriding, and this is possible in hermetically sealed furnaces. In this case it suffices to connect the exhaust gases from one furnace to the entering gases in a second furnace. With increasing degrees of dissociation of ammonia the nitriding capacity of the mixture becomes exhausted and for a given critical degree of dissociation such a mixture cannot form \ge-phase rich in nitrogen on the surface of iron, and this slows down the process and decreases the thickness of the nitrided layer. Apparently, under ordinary nitriding conditions (550\dgC, P=1 atm) this critical degree of dissociation is $${\text{V}}_{{\text{N}}_{\text{2}} + {\text{H}}_{\text{2}} } = 60\% $$ (see Fig. 2). This number divided by the degree of dissociation at the exit of each furnace determines the acceptable number of the successively connected furnaces. 2. The use of molecular nitrogen to dilute ammonia is advantageous because it widens the limits of the existence of nitride phases rich in nitrogen. This makes it possible to use mixtures poorer in nitrogen for nitriding. Figure 4a shows that even the mixture containing 20% ammonia forms the \ge-phase within the whole temperature range between 227 and 591\dgC. The use of molecular nitrogen as a solvent for ammonia is advantageous also because the amount of explosive hydrogen formed in the reaction zone then decreases. 3. The use of molecular hydrogen to dissolve ammonia is thermodynamically disadvantageous (Figs. 3c and 4c). 4. Nitriding at pressures different from 1 atm alters the position of static equilibrium. Nitriding in dissociated ammonia somewhat increases the ration of phases rich in nitrogen (Fig. 2a) but to a much lesser degree than dilution of ammonia with nitrogen. The increase in pressure is thermodynamically disadvantageous for nitriding (Fig. 2b). 5. Dilution of ammonia with some inert gas (argon, for example) does not change the position of equilibrium as compared to that resulting from dilution with molecular nitrogen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00649318
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Use of titanium chips for protection of iron against oxidation during heating (1966)
    Springer
    Metal science and heat treatment 8 (1966), S. 761-762 
    Details
    ISSN: 1573-8973
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00686595
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Standard hardness specimens (1969)
    Springer
    Measurement techniques 12 (1969), S. 787-789 
    Details
    ISSN: 1573-8906
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Conclusions The technology of manufacture of hardness standards, developed and tested under production conditions with ShKh15SG steel, ensures the production of standard specimens of high stability and homogeneity with respect to hardness. The change in values of an average hardness standard over 18 months did not exceed 0.2 HRC units. In 81% of the SHS the scatter of the hardness values over the working surface of the standard did not exceed that permitted by GOST 9031-63 for standards of the 1st order.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00995078
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Use of heat-insulating plates on casting killed steel (1969)
    Springer
    Metallurgist 13 (1969), S. 684-686 
    Details
    ISSN: 1573-8892
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01087654
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Effect of a component's surface roughness, grinding conditions and searing on the dispersion of its hardness in Rockwell testing (1966)
    Springer
    Measurement techniques 9 (1966), S. 808-810 
    Details
    ISSN: 1573-8906
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Conclusions It has been shown in the article that hardness values listed in technical specifications can be incorrectly determined owing to their dispersion which is produced if insufficient attention is paid to the surface finish of the tested components. The relationship of hardness-values dispersion to surface roughness has been evaluated. When precision hardness measurements are required, the surface roughness of components should not be lower than the 8th class specified by the GOST 2789-59. These observations should be included in the Standard for Rockwell hardness testing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00996043
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...