Conferences

Thermal Tests and Their Effect on the Micro- and Macrostructure of Nanocrystalline ZrO2

S.P.Buyakova,
 
V.V.Promakhov,
 
S.N.Kul"kov
 

Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2012, #05/06
http://www.materials.kiev.ua/article/1031

Abstract

The paper examines the effect of thermal tests in water cooling starting at 1000 0C on structural and phase transformations in nanostructured ceramics based on ZrO2 partially stabilized by Mg+2 in high-temperature modifications. The ceramics have different amounts of magnesia in the ZrO2–MgO solid solution and, as a consequence, different ratios of high- and low-temperature modifications of zirconia. It is shown that the ZrO2–MgO solid solution decomposes regardless of its magnesia content with increasing number of thermal tests, but the ceramics remain resistant to thermal shock even in case of complete MgO removal, i.e., zirconia destabilization.


HIGH-TEMPERATURE MODIFICATIONS OF ZRO2, THERMIC CYCLING, X-RAY DIFFRACTION ANALYSIS