Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Pyrolytic behaviour of Si-Ti-C-O fibre in alumina powder (1996)
    Springer
    Journal of materials science 31 (1996), S. 5113-5118 
    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 In relation to the synthesis of a ceramic matrix composite reinforced by Si-Ti-C-O fibre (Tyranno), the pyrolysis of Tyranno in alumina powder was investigated at temperatures, T, of 1773–1973 K under Ar or N2 atmosphere. Using a Tyranno-alumina compact, pyrolytic rates were determined with a thermobalance. The heat-treated fibres were examined by X-ray diffraction (XRD) and scanning electron microscope (SEM) observation. Under N2 atmosphere and at lower temperatures, pyrolysis of Tyranno was retarded by the formation of a nitrided case. The retardness effect disappeared in the presence of alumina powder. At elevated temperatures, pyrolysis was suppressed by the presence of alumina powder. Alumina was reduced to be nitrided into AIN by the gas-phase reaction between the pyrolytic gas, CO and N2. In addition,Tyranno crystallized into β-SiC and α-SiC of type 2H.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00355913
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    High-temperature stability of Nicalon under Ar or O2 atmosphere (1994)
    Springer
    Journal of materials science 29 (1994), S. 456-463 
    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 The thermal stability of Nicalon NL400 at 1573, 1673 and 1773 K has been studied by TGA and XRD. Under an Ar atmosphere, Nicalon pyrolysed severely to crystallize into β-SiC involving the generation of both SiO and CO. Under an O2 atmosphere, the oxide film which formed around Nicalon retarded the pyrolytic reaction of the core. Nicalon coated with a silica film by the previous oxidation treatment pyrolysed hardly at all under an Ar atmosphere, because the film restricted the escape of SiO and CO. Nicalon which was oxidation-treated at 1773 K retained 63% of its original strength after heating at 1773 K under an Ar atmosphere. The amorphous silica film was found to resist rapid thermal cycling between room temperature and elevated temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01162506
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Interaction of Si3N4 with Cr (1994)
    Springer
    Journal of materials science 29 (1994), S. 2231-2237 
    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 The interaction of Si3N4 with chromium was investigated under an argon or nitrogen atmosphere at temperatures from 773–1573 K. Reaction rates were determined by thermogravimetric analysis, and reaction products were examined by X-ray diffraction. Cr2N, Cr3Si, Cr5Si3 and CrSi were produced under argon, while reaction products under nitrogen were Cr2N, CrN and Cr3Si. Possible reactions between Si3N4 and chromium have been discussed thermodynamically. The initial rate obeyed a linear rate law. When chromium particles were coated with the reaction layer, the rate was described by a parabolic rate law. The reaction mechanism and the rate-determining step have been proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01154703
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Oxidation kinetics of low-oxygen silicon carbide fiber (2000)
    Springer
    Journal of materials science 35 (2000), S. 3301-3306 
    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 The effect of partial pressure and temperature on the oxidation rate of low-oxygen silicon carbide fiber (Hi-Nicalon) has been investigated. The initial oxidation rate was described by a two-dimensional disc contracting formula for reaction control, and the activation energy was 155 kJ/mol. The rate at the later stage of oxidation obeyed the equation for diffusion control, and the activation energy was 109 kJ/mol. Both the rate constants were proportional to oxygen partial pressure. The diffusion species through the SiO2 film are considered to be oxygen molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004883607913
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Interaction of Si3N4 with Ni–Cr alloy under N2 or Ar atmosphere (1998)
    Springer
    Journal of materials science 33 (1998), S. 5169-5175 
    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 In relation to the joining of silicon nitride ceramics to metal, the interaction of Si3N4 with Ni–Cr alloy was investigated at temperatures from 1073 to 1573 K under N2 or Ar atmosphere.Reaction rates were determined by thermogravimetry and reaction products were examined by X-ray diffraction. CrN, Ni3Si,Ni5Si2, Ni2Si and (Cr, Si)3Ni2Si were produced under N2 atmosphere. In addition to these products, Ni3Si2,Cr3Si and Cr5Si3 also were produced under Ar atmosphere. The reaction products were considered from the standpoint of thermodynamics. While the incubation period was observed under Ar atmosphere, it was not observed under N2 atmosphere. The initial rates obeyed a linear rate equation. The rates at the later stage of reaction described a parabolic rate equation. The reaction mechanism model was proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004475702702
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Reaction between Si3N4 and Fe-Ni alloy (1999)
    Springer
    Journal of materials science 34 (1999), S. 5525-5532 
    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 In relation to the joining of silicon nitride ceramics to metal, the reaction between Si3N4 and Fe-Ni alloy was investigated under a nitrogen or an argon atmosphere at temperatures from 1123 to 1573 K. Reaction rates were determined by thermogravimetry and reaction products were examined by X-ray diffraction. Fe-Ni-Si solid solution, Ni3Si, Ni5Si2, NiSi2, Fe3Si, Fe5Si3 and FeSi were produced. The initial rate obeyed a linear rate law. The rate at the late stage of reaction was described by a parabolic rate law or Fick's second law. The reaction mechanism and the rate-determining step were proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004720713869
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    High-temperature stability of low-oxygen silicon carbide fiber heat-treated under different atmosphere (2000)
    Springer
    Journal of materials science 35 (2000), S. 3733-3739 
    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 The effects of heat-treating atmosphere on the thermal stability of low-oxygen silicon carbide fiber were investigated. Heat-treatment of EB-cured PCS fiber were conducted at 1573 K in argon, nitrogen or vacuum of 10−6 atm. Subsequently the fibers were exposed to 1873 K in argon. The strength of fibers were strongly influenced by the heat-treating atmosphere. When heat-treated in nitrogen, the fibers absorbed nitrogen. High-temperature exposure caused severe degradation of strength owing to the decomposition of silicon oxycarbonitride phase. When heat-treated in vacuum, the fiber surface was smooth and pore-free, minimizing the degradation of strength at high temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004856725352
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Preparation of SiC-C composite fibre by carbothermic reduction of silica (1995)
    Springer
    Journal of materials science 30 (1995), S. 3387-3394 
    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 The SiC-coated carbon fibre (SiC-C composite fibre) was prepared by the carbothermic reduction of silica. The composite fibre was examined by X-ray diffraction, scanning electromicroscopy and chemical analysis. Thermogravimetry was used to determine the reduction rate of silica, and the formation mechanism of the SiC film was revealed by a kinetic study. The oxidation resistance of the composite fibre was evaluated by heating in an oxygen gas stream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349884
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Interaction of Si3N4 with titanium at elevated temperatures (1997)
    Springer
    Journal of materials science 32 (1997), S. 3031-3036 
    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 In relation to the joining of silicon nitride ceramics to metal, the reaction products and the reaction mechanism between Si3N4 and titanium have been investigated under a nitrogen or an argon atmosphere at temperatures of 823–1573 K. Using Si3N4/titanium powder mixtures, reaction rates were determined by thermogravimetric (TG) analysis, and reaction products were examined by X-ray diffraction. At higher temperatures and on prolonged heating, reaction products were changed in the following orders: TiN2, TiN2+TiN, TiN+TiSi2+Si, TiN+Si and TiN (nitrogen atmosphere) and TiN2+Ti5Si5, TiN2+TiN+Ti5Si3 and TiN+TiSi2+Si (argon). By relating these results to TG measurements, a full understanding of the reaction mechanism between Si3N4 and titanium was acquired.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018617810454
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Thermal stability of SiO2-coated SiC fiber (Hi-Nicalon) under argon atmosphere (2000)
    Springer
    Journal of materials science 35 (2000), S. 3811-3816 
    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 Thermal stability of low-oxygen SiC fiber (Hi-Nicalon) coated with SiO2 film was investigated. The SiO2 film of same thickness but different crystal structure was formed by heating low-oxygen SiC fiber (Hi-Nicalon) under different oxidation conditions. The oxidation treatment and the subsequent exposure at 1773 K in argon caused very little loss of strength for unoxidized core. For as-oxidized fiber with SiO2 film which containedimperfections, further loss of strength was caused after exposure in argon. There was little degradation of core strength on being exposed repeatedly at rapid heating and cooling rate in argon. The fiber oxidized at 1773 K kept high level of strength even after exposure at 1823 K. This is because the change in crystal structure of SiO2 film before and after exposure in argon, which was the controlling factor in the degradation of strength, was diminished with increasing oxidation temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004873128987
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...