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  • 11
    Electronic Resource
    Electronic Resource
    Raman microprobe spectroscopic studies on thermal shock fracture of ZrO2-based ceramics (1989)
    Springer
    Journal of materials science 8 (1989), S. 638-640 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730428
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  • 12
    Electronic Resource
    Electronic Resource
    High-temperature oxidation of silicon nitride-based ceramics by water vapour (1987)
    Springer
    Journal of materials science 22 (1987), S. 2635-2640 
    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 Hot-pressed Si3N4, sintered Si3N4 and three kinds of sialon with different compositions were oxidized in dry air and wet nitrogen gas atmospheres at 1100 to 1350° C and 1.5 to 20 kPa water vapour pressure. All samples were oxidized by both dry air and water vapour at high temperature, and formed oxide films consisting of SiO2, Y2Si2O7 and Y4A1209. The oxidation rate was in the order sialon 〉 sintered Si3N4 〉 hot-pressed Si3N4. The oxidation rate of sialon increased with increasing Y2O3 content, and oxidation kinetics obeyed the usual parabolic law. The oxidation rates in dry air and wet nitrogen were almost the same: the rate in wet nitrogen was unaffected by water vapour pressure above 1.5 kPa. The activation energy was about 800 kJ mol−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082156
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  • 13
    Electronic Resource
    Electronic Resource
    Solid-state bonding of partially stabilized zirconia to steel with titanium interlayer (1986)
    Springer
    Journal of materials science 5 (1986), S. 1099-1100 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01742211
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  • 14
    Electronic Resource
    Electronic Resource
    Thermal stability and mechanical properties of yttria-doped tetragonal zirconia polycrystals with dispersed alumina and silicon carbide particles (1987)
    Springer
    Journal of materials science 22 (1987), S. 882-886 
    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 Yttria-doped tetragonal zirconia polycrystals in which were dispersed various amounts of Al2O3 and SiC particles were sintered at 1500° C for 3 h, and the mechanical properties and the thermal stability of the sintered bodies were evaluated. Dispersion of Al2O3 caused no significant effect on sinterability, and increased the hardness and elasticity of the composites. Dispersion of SiC particles decreased the relative density and the grain size of composites. Elasticity and hardness increased by dispersing less than 10 vol% SiC, but decreased above 10 vol% SiC due to the decrease of relative density. Dispersion of both Al2O3 and SiC particles slightly increased the fracture toughness of ZrO2-3 mol% Y2O3 ceramics but significantly decreased that of ZrO2-2 mol% Y2O3 ceramics. The rate of the tetragonal-to-monoclinic phase transformation decreased by dispersing both Al2O3 and SiC particles. The transformation depth increased rapidly and then slowly with increasing the annealing time. The rate of increase in the transformation depth greatly decreased by dispersing Al2O3 particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01103525
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  • 15
    Electronic Resource
    Electronic Resource
    Thermal shock fracture behaviour of ZrO2 based ceramics (1989)
    Springer
    Journal of materials science 24 (1989), S. 4057-4061 
    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 shock fracture behaviour of alumina, mullite, silicon carbide, silicon nitride and various kinds of zirconia based ceramics, such as magnesia partially stabilized zirconia (Mg-PSZ), yttria and ceria doped tetragonal zirconia polycrystals (Y-TZP and Ce-TZP), Y-TZP/Al2O3 composites and yttria doped cubic stabilized zirconia (Y-CSZ), was evaluated by the quenching method using water, methyl alcohol and glycerin as quenching media. Thermal shock fracture of all materials seemed to proceed by the thermal stress due to convective heat transfer accompanied by boiling of the solvents under the present experimental conditions. Thermal shock resistance of zirconia based ceramics increased with increasing the fracture strength, but that of Y-TZP and Y-TZP/Al2O3 composites was anormalously lower than the predicted value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01168974
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  • 16
    Electronic Resource
    Electronic Resource
    Corrosion of silicon nitride ceramics in aqueous HF solutions (1988)
    Springer
    Journal of materials science 23 (1988), S. 3440-3446 
    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 leaching behaviours of hot-pressed Si3N4 ceramics containing Y2O3, Al2O3 and AIN as additives and hot isostatically pressed Si3N4 without additives were studied in 0.1 to 10 M HF aqueous solutions at 50 to 80° C. Silicon and aluminium ions were dissolved into the HF solutions, but yttrium ion did not dissolve at all and formed insoluble YF3. The dissolution of silicon and aluminium ions was controlled by the surface chemical reaction and the apparent activation energies were 70.5 to 87.6 kJ mol−1, respectively. The corrosion rate increased with increasing degree of crystallization of the grain boundary phases. The corrosion resulted in roughness of the surface and degradation of the fracture strength. Si3N4 ceramics containing an amorphous phase at the grain boundaries showed the most excellent resistance to corrosion with HF solution, and kept a fracture strength of above 400 M Pa even after leaching 40% of the silicon ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540476
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  • 17
    Electronic Resource
    Electronic Resource
    Corrosion and strength degradation of Si3N4 and sialons in K2CO3 and K2SO4 melts (1988)
    Springer
    Journal of materials science 23 (1988), S. 1405-1410 
    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 Si3N4-based ceramics, such as hot isostatically pressed Si3N4, hot-pressed Si3N4, hot-pressed sialons containing 0, 30, 60 and 100% a phase, were corroded by K2SO4 and K2CO3 melts at 1150 to 1300 and 925 to 1150° C, respectively. The surface chemical reaction-controlled shrinking core model adequately described the relationship between the weight loss of the specimen and time for the corrosion reactions in both K2SO4 and K2CO3 melts, and the apparent activation energies were 380 to 608 and 157 to 344 kJ mol−1, respectively. The corrosion rate in K2CO3 melt decreased with increasing content of aluminium and yttrium ions in the specimens, but no systematic relation was observed for the reaction in K2SO4 melts. The fracture strength of the specimens corroded by K2SO4 and K2CO3 melts degraded to 2/3 to 2/5 of the original values up to a 2% weight loss, and then was almost constant up to 30% weight loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01154608
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  • 18
    Electronic Resource
    Electronic Resource
    TiF2 with fluorite structure — a new compound (1987)
    Springer
    Journal of materials science 6 (1987), S. 859-861 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729038
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  • 19
    Electronic Resource
    Electronic Resource
    Transformation of yttria partially stabilized zirconia by low temperature annealing in air (1985)
    Springer
    Journal of materials science 20 (1985), S. 1466-1470 
    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 tetragonal-to-monoclinic phase transformation of yttria partially stabilized zirconia by low temperature annealing in air was investigated in the temperature range 100 to 650° C using a sintered body of zirconia containing 2 to 4 mol% Y2O3. The amount of monoclinic phase formed was maximum at about 200° C. Both the decrease in grain size and increase in the yttria concentration were effective in decreasing the critical temperature below which the monoclinic phase was formed. The relationship between the critical temperature (T c) and the grain size was experimentally determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026344
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  • 20
    Electronic Resource
    Electronic Resource
    Control of the tetragonal-to-monoclinic phase transformation of yttria partially stabilized zirconia in hot water (1985)
    Springer
    Journal of materials science 20 (1985), S. 3988-3992 
    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 tetragonal-to-monoclinic phase transformation of yttria partially stabilized zirconia caused by annealing in hot water was investigated in the temperature range 80 to 200° C using sintered bodies in zirconia containing 2, 3 and 4 mol % Y2O3. Three approaches, alloying ZrO2(Y2O3) with 0 to 20wt% CeO2, dispersing 0 to 40 wt % Al2O3 into ZrO2(Y2O3) ceramics and decreasing the grain size of zirconia, were examined to inhibit the tetragonal-to-monoclinic phase transformation. The amount of monoclinic phase formed decreased with increasing concentrations of CeO2 alloyed and Al2O3 dispersed, and with decreasing grain size of zirconia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552389
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