In all geologic time, the responsibilities are on our generation ... including you ...

4.3.4 Glasses

A great variety of glass products can be produced from lunar and asteroidal materials, including fiberglass, clear glass, and materials for items such as walls, pipes and some kinds of structural members.

Free natural glass is more common on the lunar surface than on Earth. The lack of water on the Moon has preserved these glasses from their volcanic inception billions of years ago and from asteroid impacts, in contrast to Earth where "devitrification" (i.e., decomposition by the chemical action of water in the environment) breaks down natural glass over the period of millions of years. This glass can be separated using simple electrostatic beneficiation.

On Earth, glass isn't used for structural applications because glass produced on Earth is heavily contaminated by water vapor present in the atmosphere which makes the material brittle, weak and prone to cracks. "Anhydrous" glass, i.e., glass produced in the absence of hydrogen or water, has significantly better mechanical properties. This has led some researchers to analyze the potential use of glasses for structural components, e.g., the General Dynamics report endorses use of foamed glass in solar power satellites, Blacic covers wider uses, and Carsley, Blacic and Pletka report on the mechanical properties of these materials produced from lunar simulants.

Manufacturing components from native glass

Source: General Dynamics/Convair report for NASA and US Dept. of Energy on making solar power satellites from lunar materials. Slightly reworded by Mark Prado for PERMANENT.

Soils rich in iron oxide (FeO) produce dark but mechanically strong glass-ceramics, whereas "colorless glass windows can be produced from basically anorthite alone or with small additions of CaO and/or SiO2. The expansion coefficient of such glasses is likely to be less than that of common window glass. This should be an asset for windows which will esperience large changes in temperature."

Clear, pure silica glass (SiO2) is readily manufacturable from lunar materials. Due to the lack of hydrogen, superior optical fibers can be readily produced.

Glasses, as opposed to glass ceramics, are produced by cooling the melted material faster to create a different crystalline structure. Good coverage of the field, including cooling rates required for different Apollo lunar compositions, is given by Pletka, as well as DeLa'O, Hellawell, Pletka and Rose.

There has also been discussed the prospects of foamed glass structural beams reinforced with asteroid nickel-iron steel so that the structural members could withstand a wide range of both tension and compression.






PERMANENT.com > Manufacturing, Industry > Bulk Construction Materials > Glasses




To get updates on PERMANENT (occasional, not frequent), get on our mailing list.

For general or specific e-mail regarding PERMANENT, please use our Feedback page.

Leave information about yourself in our people, companies, and organizations database.

If you are interested in hiring our expertise, anywhere in the world, please contact us.
We have people in the USA and Thailand, and can travel or consult by internet.
You can call anytime, 24/7, at +66-8-1135-7977

Text by Mark Prado, Copyright © 1983-2013, All Rights Reserved.
Many website artistic design elements by Sam Fraser, Copyright © 1999-2013, All Rights Reserved.

Except where specifically stated otherwise,
Copyright © 1983-2013 by Mark Evan Prado, All Rights Reserved

Source: http://www.permanent.com

PERMANENT logo
P rojects to E mploy R esources of the M oon and A steroids N ear E arth in the N ear T erm

Menu:
please see our

Site Map

to navigate.

For PCs, this righthand
side has a floating menu,
but if your tablet
or your PCs web browser
do not run
-- javascript --
then you must
-- navigate --
using the Site Map above.