Fuel Cycle Programs, Quarterly Progress Report: July-September 1981 Page: 72
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72
[ iii 5iii 100MICROM-TERS
Fig. 19. Fragments of SRL 131 Glass from 10 J/cm3 Impact
Tests Showing Small Particles that Adhere to
Larger Fragments
ones. Roughly one-third to one-half of the fines did not detach. This indi-
cates a very strong binding mechanism--probably surface welding or fusion.
This attachment was seen preferentially on the flat surfaces of the particles.
Stepped surfaces, irregular topography or conchoidal fractures with high sur-
face relief showed little evidence of attachment. Surface fusion (especially
with clean, freshly exposed surfaces which result from the grinding of glass)
was not uncommon. The adhering particles have a chemistry like that of the
large particles, have no precisely defined melt point since glass has a liquid
structure at normal temperature, and do not require preferred orientation to
effect fusion (as is the case for crystalline materials). Then, too, there is
the possibility of locally high temperatures as the particles collide during
drop-weight impact. The latter possibility will be examined theoretically.
4. Conclusions
BET surface area measurements were performed on glass samples of
reasonably well-characterized geometric shapes and with geometric surface
areas of 0.1 m2 to 4 m2. The BET surface areas were consistently higher
by ^"10 to 30% than the geometrically calculated surface areas, depending upon
the material. Smooth linear correlations of BET-measured surface areas with
calculated geometric surface areas were observed. The precision of determining
BET surface areas in the above range was measured to be 2 to 6% (i.e., better
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Steindler, M. J.; Bates, J. K.; Bowers, D. L.; Brock, R. E.; Cannon, T. F.; Castelli, D. L. et al. Fuel Cycle Programs, Quarterly Progress Report: July-September 1981, report, May 1982; Argonne, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc283345/m1/82/?q=technical+manual: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.