Shape-memory NiTi foams produced by replication of NaCl space-holders.

Shape-memory NiTi foams produced by solid-state replication with NaF

Dual properties of zirconia coated porous titanium for a stiffness enhanced bio-scaffold

Tetragonal zirconia (3YSZ) and cermet nickel–tetragonal zirconia (Ni/3YSZ) were obtained by citric method. The porosity of samples was increased by addition of two kind of pore-forming agents: graphite and ammonium bicarbonate. The different influence of this pore former on microstructure of cermet materials was found on the basis of density, total porosity and open porosity measurements and SEM/EDX analysis. TG/DTA/EGA analysis shows that thermal behaviour of pores agent directly affects microstructure properties of material. The analysis of porosity reveals that after sintering at 1200 °C in the case of samples without nickel, addition of both graphite and ammonium bicarbonate allows one to obtain above 30 vol% of open porosity. In the case of nickel cermet, only addition of 40 vol% of NH4HCO3 to the sample retains required open porosity. The results of electrical measurements show that changes of samples microstructure cause by adding of pore former do not affect significantly the conductivity of nickel–cermet samples. Ammonium bicarbonate is found to be a proper pore former for increasing porosity of anode materials for SOFC.

Effect of the addition of pore former

Preparation and dynamic deuterium gas loading of highly porous palladium bulks

Compressive properties are investigated for the porous Ni materials processing by innovated powder metallurgical (PM) method. The porous Ni materials first show a short elastic region, then a long and oblique stress yield region within the strain range of about 10–50%, and finally, a densification region where the stress increases rapidly.

L. F. Zhang

Papers

Process and compressive properties of porous nickel materials