ISSN:
1573-9139
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions Introducing 25% or more nonstabilized ZrO2 increases the spalling resistance of pressings made from prestabilized zirconia. Pressings containing 6 mole % CaO and with 7–10% monoclinic, and respectively 93–90% cubic forms, are relatively highly thermal-shock resistant. Increasing the content of monoclinic ZrO2 reduces the spalling resistance of the pressings, as with the production of pressings of monophase composition, although this single phase is a cubic solid solution. The basic temperature range, the cooling rate in which, affects the thermal-shock resistance of pressings, is 1000–800°C. The main method of increasing the thermal-shock resistance of pressings from zirconia is to create a microcracked structure, obtained by slow cooling in the range 1000–800°C. The microcracked structure also produces a significant reduction in coefficient of thermal expansion and the modulus of elasticity of the pressings, slowly cooled in the range 1000–800°C. The thermal-shock resistance of slowly cooled pressings of zirconia stabilized with CaO is at a maximum. The method developed for increasing the thermal-shock resistance of hot-pressed articles from zirconia, on account of the formation of the microcracked structure, is a general technique: it can be used for other methods of making articles from zirconia.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01288164
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