热处理对部分用氧化钐稳定的氧化锆晶体的结构和机械性能的影响

M. Borik, Alexey Kulebyakin, E. Lomonova, F. Milovich, V. Myzina, P. Ryabochkina, N. V. Sidorova, N. Tabachkova, A. Chislov
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引用次数: 0

摘要

研究了在不同介质中进行高温处理对 x = 0.02÷0.06 的 (ZrO2)1-х(Sm2O3)х 晶体的相组成、显微硬度和断裂韧性的影响。晶体是在冷头骨中采用定向熔融结晶法生长的。晶体在 1600 °C 的空气和真空环境中热处理 2 小时。利用 X 射线衍射和拉曼散射对晶体的相组成进行了研究。我们发现,钐阳离子主要以三价电荷状态进入 ZrO2 晶格,在空气或真空退火后,它们的电荷不会发生变化。除 (ZrO2)0.94(Sm2O3)0.06 成分外,所有测试晶体的退火相成分都发生了变化。经过空气或真空退火后,0.002 ≤ x ≤ 0.05 的 (ZrO2)1-x(Sm2O3)x 晶体含有单斜相。(ZrO2)0.94(Sm2O3)0.06 晶体含有两个四方相(t 和 t´),其四方度不同。在对(ZrO2)0.94(Sm2O3)0.06 晶体进行空气或真空退火后,t 相和 t´ 相的晶格参数发生了相反的变化,这表明 t 相的四方度增加,而 t´ 相的四方度降低。退火晶体的显微硬度和断裂韧性取决于固溶体中的 Sm2O3 浓度。0.037 ≤ x ≤ 0.05 的 (ZrO2)1-х(Sm2O3)х 晶体中单斜相的形成会显著降低晶体的显微硬度和断裂韧性。(ZrO2)0.94(Sm2O3)0.06 晶体的退火会引发更有效的硬化机制,从而提高晶体的断裂韧性。我们的研究表明,(ZrO2)0.94(Sm2O3)0.06 晶体的空气退火或真空退火可使晶体的断裂韧性比正常生长的晶体提高 1.5 倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of heat treatment on the structure and mechanical properties of zirconia crystals partially stabilized with samarium oxide
The effect of high-temperature treatment in different media on the phase composition, microhardness and fracture toughness of (ZrO2)1-х(Sm2O3)х crystals with x = 0.02÷0.06 has been studied. The crystals have been grown using direction melt crystallization in a cold skull. The crystals have been heat treated at 1600 °C for 2 h in air and in vacuum. The phase composition of the crystals has been studied using X-ray diffraction and Raman scattering. We show that samarium cations enter the ZrO2 lattice mainly in a trivalent charge state and do not change their charge after air or vacuum annealing. The as-annealed phase composition has changed in all the test crystals except for the (ZrO2)0.94(Sm2O3)0.06 composition. After air or vacuum annealing the (ZrO2)1-x(Sm2O3)x crystals with 0.002 ≤ x ≤ 0.05 contain a monoclinic phase. The (ZrO2)0.94(Sm2O3)0.06 crystals contain two tetragonal phases (t and t´) with different tetragonality degrees. After air or vacuum annealing of the (ZrO2)0.94(Sm2O3)0.06 crystals the lattice parameters of the t and t´ phases change in opposite manners, suggesting that the tetragonality degree of the t phase increases whereas the tetragonality degree of the t´ phase decreases. The microhardness and fracture toughness of the as-annealed crystals depend on the Sm2O3 concentration in the solid solutions. The formation of the monoclinic phase in the (ZrO2)1-х(Sm2O3)х crystals with 0.037 ≤ x ≤ 0.05 significantly reduces the microhardness and fracture toughness of the crystals. Annealing of the (ZrO2)0.94(Sm2O3)0.06 crystals triggers more efficient hardening mechanisms and thus increases the fracture toughness of the crystals. We show that air or vacuum annealing of the (ZrO2)0.94(Sm2O3)0.06 crystals increases the fracture toughness of the crystals by 1.5 times as compared with that of the as-grown crystals.
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