Abstract We report a method combining the top-down and bottom-up approaches for the fabrication of nanocrystalline ceramic, which can break down the Y2O3 nanorods and consolidate the broken nanoparticles to 99.1% relative density. The lab-mad nanorods with a length of about 500 nm and a diameter of about 20 nm, exhibit better compressibility and sinterability than the spherical nanopowders when the compaction pressure exceeds 0.4 GPa and the sintering condition is 5 GPa/500 °C, respectively. The obtained nanocrystalline ceramic shows a maximum transmittance of 81.3% in the infrared region, hardness as high as 10.5 GPa and fracture toughness of 2.21 MPa m1/2.

中文翻译：

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平均晶粒尺寸为20 nm的透明Y2O3纳米晶陶瓷的制备新方法

摘要 我们报告了一种自上而下和自下而上相结合的纳米晶陶瓷制备方法，该方法可以分解 Y2O3 纳米棒并将破碎的纳米粒子固结到 99.1% 的相对密度。当压制压力超过 0.4 GPa 和烧结条件为 5 GPa/500 °C 时，实验室制造的长约 500 nm 和直径约 20 nm 的纳米棒表现出比球形纳米粉末更好的可压缩性和可烧结性。所得纳米晶陶瓷在红外区的最大透射率为81.3%，硬度高达10.5 GPa，断裂韧性为2.21 MPa m1/2。