Zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer and preparation method thereof

A preparation method of a zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer, the method including the following steps:

• 1) using zirconium-niobium alloy powder as a raw material, conducting a 3D printing for one-piece molding, and obtaining a first intermediate product of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer, putting the first intermediate product into a Sinter-HIP furnace, heating to 1325° C. under inert gas protection, and placing at a constant pressure of 160 MPa for 2 h, and reducing to an atmospheric pressure, cooling to below 200° C. with the furnace, taking it out, and obtaining a second intermediate product;
• 2) putting the second intermediate product into a programmed cooling box, cooling to 100° C. at a rate of 1° C./min, keeping the second intermediate product at a constant temperature for 7 h, and taking it out of the programmed cooling box;
• and putting it into a liquid nitrogen for 24 h, and adjusting the temperature to room temperature so as to obtain a third intermediate product;
• 3) putting the third intermediate product in a programmed cooling box, cooling to 100° C. at a rate of 1° C./min, and placing the third intermediate product at a constant temperature for 7 h, taking it out of the programmed cooling box, and putting it into the liquid nitrogen for 24 h, and adjusting the temperature to room temperature so as to obtain a fourth intermediate product;
• 4) machining, finishing, polishing, cleaning, and drying the fourth intermediate product, and obtaining a fifth intermediate product, where an upper surface roughness of a semi-tibial plateau support of the fifth intermediate product is Ra 0.35 μm;
• 5) putting the fifth intermediate product into a tube furnace, introducing an atmospheric pressure inert gas containing 10% of oxygen in percentage by mass, heating to 600° C. at 15° C./min, and cooling to 450° C. at 0.7° C./min, and cooling to be below 200° C. sequentially, take the fifth intermediate product out to obtain the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer;
• wherein, the inert gas is helium or argon;
• the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer includes a semi-tibial plateau support (1), a side wall (2) is arranged on an upper surface of a straight edge of the semi-tibial plateau support (1), and a semi elliptical keel plate (3) provided with a long round hole is arranged near a side wall of a lower surface of the semi-tibial plateau support, the lower surface of the semi-tibial plateau support (1) and a surface of the keel plate (3) are both provided with a bone trabeculae;
• a front bone trabeculae (8) and a rear bone trabeculae (9) are arranged on the lower surface of the semi-tibial plateau support (1) except connecting the keel plate (8);
• a first partition line (6) of the front bone trabeculae (8) and the rear bone trabeculae (9) is perpendicular to the side wall (2) or is formed at an angle (4) of 45° with the side wall (2);
• the bone trabeculae arranged on the surface of the keel plate (3) comprises an upper bone trabeculae (10) and a lower bone trabeculae (11);
• the partition line of the upper bone trabeculae and the lower bone trabeculae is a second partition line (12), and the second partition line (12) is located at a lower surface of a top of the long round hole of the keel plate (3) or an upper surface of a bottom of the long round hole of the keel plate (3);
• the pore size and porosity of the upper bone trabeculae (10) are sequentially smaller than those of the rear bone trabeculae, the front bone trabeculae and the lower bone trabeculae.