论文部分内容阅读
本文讨论t-ZrO_2/β″-A1_2O_3陶瓷中晶界ZrO_2粒子的长大机制和c-ZrO_2/β″-A1_2O_3、t-ZrO_2/β″-A1_2O_3陶瓷中ZrO_2的韧化机制。“直接合并”是ZrO_2粒子长大的主要机制,Ostwald粗化机制也起作用。粒子的合并包括“相遇”和球化两个过程。在c-ZrO_2/β″-A1_2O_3和t-ZrO_2/β″-Al_2O_3陶瓷中,强度的提高是由于断裂韧性提高的结果。c-ZrO_2的韧化机制是弥散韧化。应力诱发相变韧化是t-ZrO_2的主要韧化机制,弥散韧化对t-ZrO_2/β″-A1_2O_3的断裂韧性的提高也起作用。
In this paper, the growth mechanism of the grain boundary ZrO 2 particles and the toughening mechanism of ZrO 2 in c-ZrO 2 / β “-Al 2 O 3, t-ZrO 2 / β” -Al 2 O 3 ceramics are discussed in “t-ZrO_2 / β” -A1_2O_3 ceramics. Is the main mechanism for the growth of ZrO 2 particles and the Ostwald coarsening mechanism is also involved.The combination of particles includes two processes of “encounter” and spheroidization.In the c-ZrO 2 / β “-Al 2 O 3 and t-ZrO 2 / β” -Al 2 O 3 ceramics , The improvement of strength is the result of the increase of fracture toughness.The toughening mechanism of c-ZrO 2 is diffusion-toughening.The stress-induced phase transformation toughening is the main toughening mechanism of t-ZrO 2, "The improvement of the fracture toughness of -Al 2 O 3 also works.