Preparation of MgAl[sub]2[/sub]O[sub]4[/sub] Spinel For Infrared Optical Applications

C. F. Chang; M. T. Tsai; C. T. Wang; P. Ling; I. N. Lin; S. J. Yang

doi:10.1117/12.951780

7 July 1986 Preparation of MgAl₂O₄ Spinel For Infrared Optical Applications

C. F. Chang, M. T. Tsai, C. T. Wang, P. Ling, I. N. Lin, S. J. Yang

Proceedings Volume 0588, Recent Developments in Materials & Detectors for the Infrared; (1986) https://doi.org/10.1117/12.951780
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France

Abstract

Polycrystalline MgAl204 which is transparent in the infrared spectral regions can be achieved by hot pressing of high activity powders. Fine, homogeneous and high purity MgAl204 powders were obtained by metal alkoxide-hydrolysis method. Three processes for powder preparation have been approached, namely, (1) conventional alkoxide-hydrolysis process, (2) sol-gel process and (3) diluted-sol drying process. The last process was the most attractive one, as it is easier to control the powder morphology and takes less time to prepare. Drying process affects the characteristics of the powders significantly. The morphology of spray-dried powders are thin-wall hollow spheres of uniform size, while those of freeze-dried powders show agglomerated lump. Spray-dried powders possess higher sinterability and the disks hot preesed from these powders show higher infrared transparency. That of the hot pressed spinel samples was further improved by heat treatment and optical polishing.

Citation Download Citation

C. F. Chang, M. T. Tsai, C. T. Wang, P. Ling, I. N. Lin, and S. J. Yang "Preparation of MgAl₂O₄ Spinel For Infrared Optical Applications", Proc. SPIE 0588, Recent Developments in Materials & Detectors for the Infrared, (7 July 1986); https://doi.org/10.1117/12.951780

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