【摘要】 本文采用透射电镜中电子衍射与暗场技术、X射线衍射及电子探针等方法,研究了热等静压及热等静压后时效处理的ZrO₂-5mol％Y₂O₂陶瓷的组织结构并测定力学性能。结果表明:经冷等静压成型,1500℃烧结,再于1450℃热等静压试样为c+t双相混合晶粒组织,且c相晶粒内有呈“tweed”形态的t相析出物。试样再经1100℃,1000h时效后,形成“tweed”组织,可使弯曲强度从565MPa提高到990MPa,断裂韧性也有所改善;而提高温度至1400℃时效100h,则形成“colony”组织,使强度显著下降至低于无时效组织。更多还原

【Abstract】 The microstructure and mechanical properties were studied for hot-isostatic-pressing (HIP) and aged ZrO2-5 mol% Y2O3 alloy by means of TEM and XRD. It was shown that comparing with the as-received state (HIP, not aged), the "tweed" structure obtained in early stage of aging (1100℃) generated a combination of high strength and high fracture toughness (bending strength increased from 565MPa to 990MPa). However, when it transforms into "colony" structure in later stage of aging (1400℃), the strength decreases to a value much. lower than that of the as-received alloy as a result of t-ZrO2 precipitation and the increase of Y2O3 content in the matrix.更多还原