Role of stabilisers in the design of Ti aqueous suspensions for pressure slip casting

R.G. Neves 1 B. Ferrari 2 A.J. Sanchez-Herencia 2 Cécile Pagnoux 3 E. Gordo 1, *
* Auteur correspondant
3 SPCTS-AXE1 - Axe 1 : procédés céramiques
SPCTS - Science des Procédés Céramiques et de Traitements de Surface
Abstract : Colloidal processing has long been used in ceramics to achieve green bodies with high densities, complex shapes and homogeneous microstructures, but they are rarely used to shape metal powders because of their high density and high surface reactivity. However, the possibility of processing fine particles makes these techniques interesting for metals, such as titanium, with a low density and high melting point. This work presents encouraging results in the design of aqueous suspensions of Ti particles to be shaped into bulk pieces by pressure slip casting (PSC), which opens new paths for the processing of fine and complex microstructures. Ti powders, measuring 10μm in size, and mixtures of Ti and Al2O3 powders (added up to 5wt.%) were dispersed in water by the addition of different stabilisers. The influence of the stabilisers in the slurry behaviour (in terms of nature, stereochemistry and active functional groups) was determined, as well as the incorporation of ceramic particles. A polyacrylic-based dispersant was selected as the best stabiliser to incorporate a second component (Al2O3) into the Ti suspension, whereas shear-thinning additives, such as TIRON, are preferred for PSC shaping. Suspensions with 1wt.% Al2O3 were selected for processing composites by PSC and sintering. Sintered materials were characterised by measuring the density, oxygen content, hardness and microstructure analysis by SEM. Ti bulk pieces with 97% density and fine and homogeneous microstructure, of which the relationship between the oxygen content and hardness agrees with that measured for CPTi grade 4 (249±24HV30), can be processed by PSC
Type de document :
Article dans une revue
Domaine :
Liste complète des métadonnées

https://hal-unilim.archives-ouvertes.fr/hal-01116164
Contributeur : Fabrice Rossignol <>
Soumis le : jeudi 12 février 2015 - 16:29:49
Dernière modification le : jeudi 7 mars 2019 - 15:26:04

Lien texte intégral

Identifiants

Collections

Citation

R.G. Neves, B. Ferrari, A.J. Sanchez-Herencia, Cécile Pagnoux, E. Gordo. Role of stabilisers in the design of Ti aqueous suspensions for pressure slip casting. Powder Technology, Elsevier, 2014, 263, pp.81-88. ⟨10.1016/j.powtec.2014.04.093⟩. ⟨hal-01116164⟩

Partager

Métriques

Consultations de la notice

118