RT Journal Article
T1 Improvement of Ti Processing through Colloidal Techniques
A1 García das Neves, Roberto
A1 Escribano  Quintana, Juan Antonio
A1 Ferrari, Begoña
A1 Gordo Odériz, Elena
A1 Sánchez-Herencia, A. J.
AB The colloid-chemistry control of metallic powders in aqueous slurries is proposed as a way to prepare Ti powders with small particle size for a better pressing behavior through the spray dry process. The chemical-physic behavior of titanium powders with two different particle size distributions dispersed in water has been studied by measuring the zeta potential as a function of pH, and dispersant concentration. The employment of poly-acrylic dispersants allowed the fabrication of stable slurries with solid contents up to 50 vol% that have been sprayed under different conditions to form agglomerates ranging between 50 and 200 µm. Conditions were selected to achieve spherical agglomerates formed by a broad distribution of particle sizes that shown excellent flowability. Agglomerates were pressed in a uniaxial die to measure the compressibility, showing an improvement in pressing behavior with respect to powders with bigger particle size. The sintering behavior is also improved, as values of 96 % of the theoretical density were obtained for compacts sintered in vacuum at 1100 ºC for 30 minutes.
SN 1013-9826
YR 2012
FD 2012-08-01
LK https://hdl.handle.net/10016/16983
UL https://hdl.handle.net/10016/16983
LA eng
DS e-Archivo
RD 26 jun. 2024