Preparation of α-Alumina Platelets by Laser Scanning

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2008-07-07 DOI:10.1111/j.1551-2916.2004.01606.x

Yiquan Wu, Kwang-Leong Choy, Larry L. Hench

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引用次数: 14

Abstract

A laser scanning with gas jet process was developed to prepare alumina platelets from an alumina powder. When the carbon-dioxide laser scanned the alumina powdery coatings prepared using an electrospraying technique, the alumina particles were heated to a melting state. The coaxial gas ejection force pushed the melting particles to obtain tabular shape grains that recrystallized into alumina platelets in the subsequent rapid-cool solidification. The phase and morphologies of powder bed were characterized by XRD and SEM. Results show that only α-alumina platelets were formed in the scanning process and the average edge length and thickness is 10 μm and 1–2 μm, respectively. Laser processing parameters such as laser energy density, scanning speed, and gas pressure were expected to play a vital role in the melting-crystallization-solidification process for obtaining platelike grains from powder beds. The preliminary experiment showed that the laser-scanning technique could be an effective means of tailoring the morphologies of particles to meet application requirements.

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激光扫描法制备α-氧化铝薄片

采用气喷激光扫描法制备氧化铝薄片。当二氧化碳激光扫描采用电喷涂技术制备的氧化铝粉末涂层时，氧化铝颗粒被加热到熔化状态。同轴气体喷射力推动熔融颗粒获得板状晶粒，在随后的快速冷凝固中再结晶成氧化铝片状。采用XRD和SEM对粉末床的物相和形貌进行了表征。结果表明:扫描过程中只形成α-氧化铝片状，边缘平均长度为10 μm，边缘平均厚度为1-2 μm;激光加工参数，如激光能量密度、扫描速度和气体压力，在从粉末床中获得片状晶粒的熔化-结晶-凝固过程中起着至关重要的作用。初步实验表明，激光扫描技术可作为一种有效的手段来定制颗粒的形态，以满足应用要求。

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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.