Effect of Porosity on the Elastic Modulus of the Compacts Made of a Titanium Powder Synthesized from Titanium Hydride
摘要
Abstract—The compressive properties of titanium having various degrees of porosity fabricated by powder metallurgy methods from a powder mixture of titanium hydride TiH2 and a pore forming agent (ammonium bicarbonate NH4HCO3) are studied. Sintering is performed in vacuum or argon at 1150 and 1200°C. A change in the volume fraction of ammonium bicarbonate from 0 to 60% is shown to control the porosity of titanium samples from 3 to 59%. The compressive elastic modulus of porous titanium is found to decrease from 50 to 4 GPa when the porosity increases from 3 to 59%. The sintering atmosphere and a change in the sintering temperature by 50°C are shown to insignificantly affect the elastic modulus: it changes by ≈10%.