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Proceedings Paper

Preparation of MgAl[sub]2[/sub]O[sub]4[/sub] Spinel For Infrared Optical Applications
Author(s): C. F. Chang; M. T. Tsai; C. T. Wang; P. Ling; I. N. Lin; S. J. Yang
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Paper 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.

Paper Details

Date Published: 7 July 1986
PDF: 6 pages
Proc. SPIE 0588, Recent Developments in Materials & Detectors for the Infrared, (7 July 1986); doi: 10.1117/12.951780
Show Author Affiliations
C. F. Chang, National Tsing Hua University (Taiwan)
M. T. Tsai, National Tsing Hua University (Taiwan)
C. T. Wang, National Tsing Hua University (Taiwan)
P. Ling, National Tsing Hua University (Taiwan)
I. N. Lin, Chung Shan Institute of Science and Technology (Taiwan)
S. J. Yang, Chung Shan Institute of Science and Technology (Taiwan)

Published in SPIE Proceedings Vol. 0588:
Recent Developments in Materials & Detectors for the Infrared
John S. Seeley; John S. Seeley, Editor(s)

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