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AssigneeHowmedica Osteonics Corp.
InventorsAnne-laure Penard, Fabrice Rossignol, Thierry Chartier, Cecile Pagnoux, Matthew Murphy, Christophe Cueille, Gerard M. Insley
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A method of producing a ceramic component includes dispersing an alpha-alumina nanopowder whose diameter is above 100 nm in water, using 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) or 4,5-Dihydroxy-m-benzenedisulfonic Acid, Disodium Salt (Tiron™) as dispersant. The pH is shifted towards the isoelectric point (IEP) by adding a mixture of acetic anhydride and ethylene glycol or polyethylene glycol, drying in a controlled atmosphere (humidity, temperature) and post compacting using cold isostatic pressing and sintering the three-dimensional structure thus formed.
A method of producing a ceramic component comprising mixing an oxide nanopowder with a metal cation whose diameter is above 100 nm in water, and 1 PPM of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) mol per m2 of oxide powder surface in highly pure water at a solid loading of over 55% by volume, shifting the pH of the mixture towards the isoelectric point (IEP) by adding to the mixture an acetic anhydride and ethylene glycol or polyethylene glycol;
The method as claimed in claim 12 in which the body is coagulated and is dried and de-molded before sintering.
A method of producing a ceramic component comprising preparing a suspension of alumina powder in water and about 1 PPM of PBTC mol per m2 of alumina powder surface, wherein the alumina powder is more than 55% by volume;
The method as set forth in claim 18 wherein the alumina powder is mixed in the suspension in two stages.
The method as set forth in claim 19 wherein the two stages are a first stage of 40% alumina powder or less by volume and the second stage is 18% or less by volume.
The method as set forth in claim 22 wherein a mixture is prepared 1/8 by volume of acetic anhydride and 7/8 by volume of ethylene glycol.
A method of producing a ceramic component comprising:
The method as set forth in claim 29 wherein the metal oxide powder is an alpha-alumina powder.
The method as set forth in claim 32 wherein the energy of the ultrasound treatment is applied in pulses
Dependencies are inferred from the claim text.