Research On Catalytic Debinding Of Titanium And Effect Of Oxygen On Mechanical Properties And Microscopic Deformation Mechanisms Of Metal Injection Molding Deformation Mechanisms Of Metal Injection Molding Titanium

Abstract:By powder injection molding titanium and titanium alloy parts with complex shape, high dimensional accuracy and high-density can be prepared at low cost, which greatly expanded the application of titanium and its alloys. Oxygen is the most difficult to control and the greatest impact on the performance of impurity elements. In this paper, Catamold-Ti feedstock was used to prepare titanium samples with low carbon and nitrogen content by powder injection molding, catalytic debinding of titanium and effect of oxygen on mechanical properties and microscopic deformation mechanisms of metal injection molding titanium were researched. The results of this work are as follows:Catalytic debinding rate increases with increasing HNO3flow rate, a appropriate HNO3flow rate is1.0-1.5cc/min; temperature has little effect on the catalytic debinding rate when the temperature is110℃-125℃; weight loss rate increases as catalytic debinding time increases, and the weight loss rate increasing trend becomes stable, gradually approaching the theoretical maximum.Titanium with excellent performance can be prepared by metal injection molding process, impurities can be controlled, C<0.25wt.%, N<0.002wt.%, O<0.25wt.%, density is up to4.30g/cm3, elongation is up to10.4%, ultimate tensile strength reaches602MPa.Interstitial oxygen atoms greatly increased bulk density of dislocations and stress concentration at the grain boundaries, and with increasing oxygen content,<a> type slip reduction,<c> type slide gradually increased, so the plastic deformation ability decreases with increasing oxygen content.