TY - JOUR
T1 - Restructuring of alumina particles using a plasma torch
AU - Shim, H.
AU - Phillips, J.
AU - Fonseca, I. M.
N1 - We are very grateful to the National Science Foundation, Division of Chemical Transport Systems (CTS-9812444) for support of this work.
PY - 1999/3
Y1 - 1999/3
N2 - A method to modify ceramics using a low power microwave plasma torch is described. The size, shape, surface area, and phase of alumina particles were dramatically modified by passage through an atmospheric pressure argon plasma, operated at 1 kW or less power. Specifically, irregularly shaped particles of γ-alumina with an average diameter of 11 μm were converted to smaller (ca. 4 μm) spherical particles primarily consisting of δ- and α- (corundum) phases. Also notable was the finding that modifications of the particles, such as changes in surface area, correlate to applied plasma energy. The plasma torch was operated with an argon flow rate of 5 slpm, power of between 400 and 1000 W, and average particle residence time in the plasma of 0.1 s.
AB - A method to modify ceramics using a low power microwave plasma torch is described. The size, shape, surface area, and phase of alumina particles were dramatically modified by passage through an atmospheric pressure argon plasma, operated at 1 kW or less power. Specifically, irregularly shaped particles of γ-alumina with an average diameter of 11 μm were converted to smaller (ca. 4 μm) spherical particles primarily consisting of δ- and α- (corundum) phases. Also notable was the finding that modifications of the particles, such as changes in surface area, correlate to applied plasma energy. The plasma torch was operated with an argon flow rate of 5 slpm, power of between 400 and 1000 W, and average particle residence time in the plasma of 0.1 s.
UR - http://www.scopus.com/inward/record.url?scp=0033100531&partnerID=8YFLogxK
U2 - 10.1557/JMR.1999.0113
DO - 10.1557/JMR.1999.0113
M3 - Article
AN - SCOPUS:0033100531
VL - 14
SP - 849
EP - 854
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 3
ER -