The method for preparing porous tantalum skeleton includes the following steps: (1) slurry preparation: mixing tantalum powder with methyl cellulose to make paste; Then add octadecanoic acid, mixed evenly to obtain slurry; The volume ratio of tantalum powder to octadecanoic acid is (60 ~ 70) : (2) skeleton body preparation: the slurry is added to the molding equipment, and the skeleton body is prepared by injection molding according to the shape of the required skeleton; (3) Skeleton preparation: the molded skeleton body is placed at room temperature for 20 ~ 30h, and then held at 40 ~ 60℃ for 20 ~ 30h, and finally the porous tantalum skeleton can be obtained by heating treatment. The preparation method of the invention has the advantages of easy availability of raw materials, mild preparation conditions, simple and controllable process, environmental protection in the preparation process, high production efficiency, and the prepared porous tantalum skeleton has no side effects on the human body, and is suitable for being used as a connecting member of bearing bone tissue trauma or bone defect.
However, because the melting point of tantalum is as high as 2850℃, and its boiling point is higher, it is a refractory metal like tungsten, and the activity of Ta is also relatively large, which is very easy to interact with oxygen and nitrogen in the air, resulting in the preparation of porous tantalum is more difficult, and the price is more expensive. At present, the main methods for preparing porous tantalum are sintering, laser forming and gas deposition. Sintering method is more common. uses the foam impregnation method to prepare porous tantalum. Specifically, the tantalum powder slurry is made from the solution prepared with organic binder and dispersant and tantalum powder, and is poured into the organic foam and impregnated until the pores of the organic foam are filled with tantalum powder slurry. Then dry to remove the dispersant in the organic foam with tantalum powder slurry, degreasing in an inert gas atmosphere to remove the organic binder and organic foam, sintering under vacuum to produce porous sintered body, cooling, annealing under vacuum and conventional post-treatment to produce porous tantalum.
The heat treatment is a vacuum of 10-4Pa ~ 10-3Pa, 10 ~ 20℃/min heating to 800 ~ 900℃, insulation 240 ~ 480min, and then 2 ~ 5℃/min cooling to 400℃, insulation 120 ~ 300min, and then with the furnace cooling to room temperature discloses a medical metal implant material porous tantalum and its preparation method, which is also the first preparation of mixed slurry poured in the organic foam, and then sintering to prepare the product; A medical porous tantalum material and its preparation method for replacing dental bone. The tantalum powder is mixed with polyvinyl alcohol and sodium bicarbonate into a mixed powder, and then the mixed powder is pressed into an organic foam to form, degreasing, sintering, cooling and heat treatment to produce the product;
