heated and agitated to form a peg solution 60 g of tantalum powder with less than 43 u03bcm of diameter and less than 0 1 of oxygen content was scaled by a 200 g balance and added to 50 ml of the peg solution the peg solution was cooled the tantalum powder and the peg solution were mixed and agitated homogeneously to form tantalum slurry the tantalum slurry was casted into a 10 u00d7 10 u00d7 30 mm porous polyurethane foam body 0 48 mm of average pore diameter 0 025 g cm 3 of density and 50 u00b0 of hardness by vibrant pressurization then the polyurethane foam body filled with the tantalum slurry was put into a porcelain dish placed in a vacuum drier the polyurethane foam body filled with the tantalum slurry was dried in the vacuum drier at 60 u00b0 c for 8 hours under 1 pa of vacuity the dried polyurethane foam body filled with the tantalum slurry was degreased at 600 u00b0 c for 120 minutes under lower than 10 u2212 4 pa of vacuity the dried polyurethane foam and the dried tantalum slurry were separated after the process of degreasing then the dried tantalum slurry are sintered in a vacuum sintering furnace at 2000 u00b0 c for 2 hours under 10 u2212 4 pa of vacuity to form a porous sintered body the argon is employed as a protective gas during sintering the porous sintered body was cleaned out of the.