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AssigneeComalco Aluminium Limited
InventorsThomas K. Smith, Raymond W. Shaw, Christopher J. Heathcock, Leslie C. Edwards, Malcolm J. Couper, Kenong Xia
Estimating the term…
A calcined microsphere of ultrafine bauxite particles having a mean particle size in the range 0.01 to 0.3 micrometers, said microsphere having a particle size less than 30 micrometers and being characterized by a substantially solid form having a pycnometric density substantially falling in the range 3.2-3.9 g/cm.sup.3, a BET surface area substantially falling in the range 0.05 to 0.5 m.sup.2 /g and a crystal grain size less than 4 micrometers, the surface chemistry of the microsphere being modified to enhance the wettability of the microsphere and to improve its ability to bond strongly with matrix materials in use.
A calcined microsphere of ultrafine bauxite particles suitable for use in reinforcing a matrix material, said microsphere having a particle size less than 100 micrometers and being characterised by a solid form having a pycnometric density falling in the range of about 3.2 to about 3.9 g/cm.sup.3, a BET surface area falling in the range of about 0.06 to about 0.5 m.sup.2 /g and a crystal grain size of less than 4 micrometers, said microsphere having a surface chemistry that provides enhanced wettability of the microsphere to allow it to mix with matrix materials and improved ability of the microsphere to bond strongly with matrix materials.
Calcined microspheres produced by the method comprising the steps of:
Dependencies are inferred from the claim text.