Colloidal processing and optical transmittance of submicron polycrystalline alumina

Tzu-Chien Wen; Dinesh K. Shetty

doi:10.1117/12.884311

20 May 2011 Colloidal processing and optical transmittance of submicron polycrystalline alumina

Tzu-Chien Wen, Dinesh K. Shetty

Author Affiliations +

Proceedings Volume 8016, Window and Dome Technologies and Materials XII; 80160C (2011) https://doi.org/10.1117/12.884311
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

Grain-boundary scattering due to intrinsic birefringence limits the optical transmittance of polycrystalline alumina (PCA). Smallest grain size and highest density are desired for maximum real in-line transmittance (RIT). Grain size versus density or sintering path plots were employed to compare different colloidal routes for fabricating green bodies followed by pressureless sintering and hot-isostatic pressing. Compacts fabricated by colloidal pressing showed superior density at similar grain size as compared to slip-cast compacts. The real in-line transmittance of the PCA was measured over a range of wavelengths (0.19-10 μm). The compacts fabricated by colloidal pressing showed higher transmittance as compared to slip-cast specimens. The measured transmittance was still, however, slightly lower than the theoretical values predicted by the grain-boundary scattering model of Apetz and van Bruggen. The grain-size dependence of RIT was analyzed using a model that combined grain-boundary scattering and scattering by isolated grain-boundary pores.

Citation Download Citation

Tzu-Chien Wen and Dinesh K. Shetty "Colloidal processing and optical transmittance of submicron polycrystalline alumina", Proc. SPIE 8016, Window and Dome Technologies and Materials XII, 80160C (20 May 2011); https://doi.org/10.1117/12.884311

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE