Abstract

For the first time, aluminum oxynitride (ALON) powders were synthesized using the precursors processed through aqueous sol–gel procedures. Appropriate quantities of aluminum nitride (AlN) powder and aqueous boehmite sol were mixed to obtain molecular stoichiometry of AlON. However, during the course of process, AlN powders reacted with the aqueous boehmite sol and disintegrated into its hydrated compounds. Such reactions altered the molecular stoichiometry between boehmite and AlN which was initially formulated for the eventual formation of AlON. Extensive investigations were carried out to analyse the behavior of AlN during the sol–gel processing. Hydrolysis of AlN in the aqueous sol–gel medium was circumvented by subjecting AlN to a surface modification process. The homogeneously dispersed boehmite sol and AlN mixture was further gelled, dried, and heat treated at temperatures between 1600 and 1850 °C for the formation of AlON powder. AlON phase formation was confirmed through XRD investigations, and its physical and microstructural properties were also evaluated through FESEM and TEM analyses. AlON powder with an average particle size of 490 nm was successfully synthesized in this study. This process is suitable for producing AlON powder in bulk quantities, and it can be used readily for further processes such as shaping and sintering to produce various optical products based on AlON.

中文翻译：

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前体的水溶胶-凝胶工艺及其所合成的氧氮化铝粉末

摘要

首次使用通过水溶胶-凝胶法处理的前体合成了氧氮化铝（ALON）粉末。混合适量的氮化铝（AlN）粉末和勃姆石水溶液，以获得AlON的分子化学计量。但是，在加工过程中，AlN粉末与勃姆石水溶胶发生反应并分解成水合化合物。此类反应改变了勃姆石与AlN之间的分子化学计量，该分子最初是为最终形成AlON而配制的。进行了广泛的研究以分析AlN在溶胶-凝胶加工过程中的行为。通过对AlN进行表面改性处理，可以避免AlN在水溶胶-凝胶介质中的水解。将均匀分散的勃姆石溶胶和AlN混合物进一步胶凝，干燥，并在1600至1850°C的温度下进行热处理，以形成AlON粉末。通过XRD研究确认了AlON相的形成，并通过FESEM和TEM分析评估了其物理和微观结构性质。本研究成功合成了平均粒径为490 nm的AlON粉末。该方法适合于大量生产AlON粉末，并且可以容易地用于诸如成型和烧结之类的进一步过程以生产基于AlON的各种光学产品。本研究成功合成了平均粒径为490 nm的AlON粉末。该方法适合于大量生产AlON粉末，并且可以容易地用于诸如成型和烧结之类的进一步过程以生产基于AlON的各种光学产品。本研究成功合成了平均粒径为490 nm的AlON粉末。该方法适合于大量生产AlON粉末，并且可以容易地用于诸如成型和烧结之类的进一步过程以生产基于AlON的各种光学产品。