Hot Forging Of Alkali Halides

B. E. Kinsman; R. Hanney; R. W. Sparrow

doi:10.1117/12.944970

11 December 1984 Hot Forging Of Alkali Halides

B. E. Kinsman, R. Hanney, R. W. Sparrow

Proceedings Volume 0508, Production Aspects of Single Point Machined Optics; (1984) https://doi.org/10.1117/12.944970
Event: 28th Annual Technical Symposium, 1984, San Diego, United States

Abstract

A short programme has been carried out to examine the preparation of strengthened polycrystalline alkali halide optics by hot-forging of single crystals. Potassium chloride and caesium iodide were chosen as subjects for this study which began with the optimisation of forging conditions for preparation of 25 mm diameter plano and plano-convex specimens. The following parameters were varied; temperature, load, deformation ratio, strain rate, lubricant, and crystal orientation. The use of optically polished die platens resulted in a surface quality suitable for direct use in lower grade optics; further improvement could be made by standard optical polishing methods. Variation in grain size was investigated by etching the surfaces of forged pieces and examining the grain structure by optical microscopy. Following initial results on 25 mm forgings the work has been extended to 75 mm diameter forgings of potassium chloride. Some experiments have also been carried out with a hot isostatic pressing system using pressurised helium as an improved lubricating medium. Initial results of strength and optical quality measurements are presented.

Citation Download Citation

B. E. Kinsman, R. Hanney, and R. W. Sparrow "Hot Forging Of Alkali Halides", Proc. SPIE 0508, Production Aspects of Single Point Machined Optics, (11 December 1984); https://doi.org/10.1117/12.944970

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

Includes PDF, HTML & Video, when available