Vasylkiv Oleg, Demirskyi Dmytro, Sakka Yoshio, Ragulya Andrey, Borodianska Hanna
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
J Nanosci Nanotechnol. 2012 Jun;12(6):4577-82. doi: 10.1166/jnn.2012.6177.
Two-stage densification process of nanosized 3 mol% yttria-stabilized zirconia (3Y-SZ) polycrystalline compacts during consolidation via microwave and spark-plasma sintering have been observed. The values of activation energies obtained for microwave and spark-plasma sintering 260-275 kJ x mol(-1) are quite similar to that of conventional sintering of zirconia, suggesting that densification during initial stage is controlled by the grain-boundary diffusion mechanism. The sintering behavior during microwave sintering was significantly affected by preliminary pressing conditions, as the surface diffusion mechanism (230 kJ x mol(-1)) is active in case of cold-isostatic pressing procedure was applied.
观察到纳米级3摩尔%氧化钇稳定氧化锆（3Y-SZ）多晶坯体在通过微波和放电等离子烧结固结过程中的两阶段致密化过程。微波烧结和放电等离子烧结获得的活化能值为260 - 275 kJ·mol⁻¹，与氧化锆传统烧结的活化能值非常相似，这表明初始阶段的致密化受晶界扩散机制控制。微波烧结过程中的烧结行为受预压条件的显著影响，因为在采用冷等静压工艺的情况下，表面扩散机制（230 kJ·mol⁻¹）起作用。
