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  • 1
    Electronic Resource
    Electronic Resource
    Fractography, Mechanical Properties, and Microstructure of Commercial Silicon Nitride–Titanium Nitride Composites (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Commercial-grade Si3N4–TiN composites with 0, 10, 20, and 30 wt% TiN content have been characterized. Submicrometer grain-size Si3N4 was reinforced with fine TiN grains. Density, Young's modulus, coefficient of thermal expansion, and fracture toughness increased linearly with TiN content. Increased strength was observed in the Si3N4+20 wt% TiN, and Si3N4+30 wt% TiN composites. Fractography was used to characterize the different types of fracture origins. Improvements in toughness and strength are due to residual stresses in the Si3N4 matrix and the TiN particles. A threefold improvement in dry wear resistance of the Si3N4+30 wt% TiN composite over the Si3N4 matrix was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00186.x
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal Cycling, Thermal Aging and Thermal Shock Behavior of Nicalon-Fiber Reinforced Glass Matrix Composites (1998)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 164-165 (July 1998), p. 345-350 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/45/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.164-165.345.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Segregation Profiles in Diffusion Soldered Ni/Al/Ni Interconnections (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 508 (Mar. 2006), p. 385-392 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: An Al foil of 25 µm thickness was used to produce a Ni/Al/Ni interconnection underisothermal conditions at 680°C. After dissolution of the Al filler metal in the Ni substrate, and Ni from the substrate in the Al liquid foil, a solidification process occurred. First of all, the solidification was stopped just at the disappearance of the Al liquid metal, but also at different steps of the progress of solidification. Sub-layers of the two phases Al〈sub〉3〈/sub〉Ni〈sub〉2〈/sub〉 and Al〈sub〉3〈/sub〉Ni were revealed within the frozen joints. A solidification - segregation model was developed to describe the formation of the sub-layers of both mentioned phases. The model is able to predict solute segregation profiles across the sub-layers of the Ni/Al/Ni interconnection, taking into account a superposition of some phenomena like partitioning, back-diffusion into the solid and peritectic reactions. The value of the diffusion coefficient into the solid for the Al〈sub〉3〈/sub〉Ni〈sub〉2〈/sub〉 phase formation in the presence of the liquid is also estimated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.508.385.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Selection and Design of Brazing Fillers for Metal-Ceramic Joints (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 4008-4012 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Three different approaches for metal to ceramic brazing are compared using the example ofSi3N4/TiN-steel joints: the use of an active filler metal (single layer brazing system), themetallisation of the ceramic and brazing with a non active filler (two-layer brazing system), the useof a composite brazing filler system (three layer brazing system). Different aspects are analysed: thedevelopment of the joint’s microstructure in the as-brazed state, the thermally induced residualstresses and the resulting bend strength of the joint’s strength.With two layers and three layers brazing system, bend strength of about 400 MPa, about 15%higher then single filler metal, were achieved. The three layer brazing system has two advantages:firstly one step processing secondly lower scattering of joint bend strength compared to two layersbrazing system.The key factors in all cases are the selection of the brazing fillers and the braze design. In all cases acareful selection of the brazing fillers and the braze design are the key factors. The first criteria forthe selection of the brazing fillers for joints of dissimilar materials can be done by considering onlythe main filler characteristics like titanium content, processing temperature and yield stress. It’snecessary to simulate the joint behaviour by finite element simulation for verifying the finalselection of filler metals. It was clearly seen that the plasticity of the filler metal is the main factoraffecting residual stresses for the joint geometry in this current work
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4008.pdf
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    Paper (German National Licenses)
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