Advanced alumina ceramics with pseudo-isotropic optical properties for infrared windows

IF 3.8 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2025-08-05 DOI:10.1111/jace.70175

Akio Ikesue, Yan Lin Aung

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Abstract

We successfully fabricated polycrystalline alumina ceramics with a hexagonal structure that exhibit excellent light transmittance in the near- to mid-infrared spectrum. Although composed of hexagonal crystals, these ceramics exhibit minimal light leakage due to birefringence, with transmittance values below 0.2% when measured under cross nicols beyond the near-infrared wavelength bands. The extinction ratio exceeds 30 dB, comparable to that of birefringence-free materials such as cubic Y₂O₃ ceramics and c-axis single-crystal sapphire. Using the near-infrared (0.9–1.7 µm) and mid-infrared (3–5 µm) cameras, the images obtained for the fabricated alumina windows (t = 2–6 mm) exhibited similar levels of brightness and clarity to those observed through the sapphire single crystal windows. These advanced alumina ceramics exhibit exceptional mechanical properties, including a Vickers hardness (H_v1) of 2205, a bending strength of 945 MPa, and a fracture toughness (K_1C) of 3.4 MPa.m^0.5. This transparent alumina ceramic exhibits pseudo-optical isotropy in the infrared region, providing window characteristics comparable to those of cubic polycrystalline ceramics and c-axis sapphire single crystals.

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具有伪各向同性光学特性的高级氧化铝陶瓷用于红外窗口

我们成功地制备了具有六方结构的多晶氧化铝陶瓷，在近红外到中红外光谱中表现出优异的透光性。虽然由六方晶体组成，但由于双折射，这些陶瓷表现出最小的光泄漏，当在近红外波长波段以外的交叉镍下测量时，透射率值低于0.2%。消光比超过30 dB，与立方Y2O3陶瓷和c轴单晶蓝宝石等无双折射材料相当。利用近红外（0.9-1.7µm）和中红外（3-5µm）相机，制备的氧化铝窗口（t = 2-6 mm）的图像显示出与蓝宝石单晶窗口相似的亮度和清晰度。这些先进的氧化铝陶瓷具有优异的机械性能，包括维氏硬度（Hv1）为2205，抗弯强度为945 MPa，断裂韧性（K1C）为3.4 MPa.m0.5。这种透明氧化铝陶瓷在红外区域表现出伪光学各向同性，提供了与立方多晶陶瓷和c轴蓝宝石单晶相当的窗口特性。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.