Conferences

Change in Pore Structure of Yttria-Stabilized Zirconia during Sintering

S.V.Gabelkov,
 
R.V.Tarasov,
 
A.G.Mironova
 

Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2011, #03/04
http://www.materials.kiev.ua/article/1386

Abstract

The behavior of big and small pore channels and closed pores (pore space constituents) in temperature ranges of intensive (900–1150 °С) and less active (1150–1400 °С) sintering of a sample produced by pressing from nanosized powder of tetragonal zirconia solid solution is investigated. The decrease in the volume of the sample over the temperature range of intensive sintering is determined by approximately equal decrease in the volume of big and small pore channels, which originate from channels between agglomerates and between aggregates in powder agglomerates. The closed pores of the sample originating from closed pores of the powder make a minor contribution to the volume decrease since they contain air. Over the temperature range of less active sintering, all small (200–300 nm) and big (0.8–1 μm) pore channels are broken and new closed pores are formed.


ACTIVATION ENERGY, CLOSED PORES, NANOSIZE POWDER, PORE CHANNELS, PORE SPACE, SINTERING, ZIRCONIA