Effects of addition of NH4HCO3 on pore characteristics and
compressive properties of porous Ti-10%Mg composites
compressive properties of porous Ti-10%Mg composites
(College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China)
Nanjing 210016, China)
Abstract: Porous Ti-Mg composites were successfully fabricated through powder metallurgy processing with ammonium hydrogen carbonate (NH4HCO3) as a space-holder. The effects of NH4HCO3 on properties of porous composites were comprehensively investigated. The pore characteristics and compressive properties of the specimens were characterized by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The results show that the porosity of the porous composites can be tailored effectively by changing the amount of NH4HCO3 added, and the use of NH4HCO3 has no influence on the microstructure and phase constituents of the Ti-10%Mg porous composites. The open porosity and compressive strength as well as compressive elastic modulus vary with the adding amount and particle size of NH4HCO3. When the mass fraction of NH4HCO3 added is 25%, elastic modulus and compressive strength of composites with porosity of around 50% are found to be similar to those of human bone.
Key words: Ti-Mg composite; NH4HCO3; powder metallurgy; porosity; compressive