Preparation method of titanium foams for cancellous bone
A technology of foamed titanium and cancellous bone, which is applied in the field of foamed titanium materials, can solve the problems of reducing the service life of titanium and titanium alloy implant materials, unfavorable bone tissue growth, and few researches, so as to avoid stress shielding and realize Long-term fixation and simple operation
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[0033] Example 1: See figure 2 , A method for preparing titanium foam for cancellous bone, including the following steps:
[0034] 1) Mixing of raw materials: select titanium powder and acicular crystal urea particles with a particle size of 225-420μm and mix to obtain a preliminary mixture, wherein the mass ratio of titanium powder and pore former is 46.6:53.4; titanium powder And the microscopic appearance of urea particles like figure 1 Shown. The titanium powder can be purchased directly from the market, and its surface and irregular shape can improve the strength of the green compact on the one hand, and promote sintering on the other hand.
[0035] 2) The preliminary mixture is unidirectionally pressed into a green compact using a 600KN universal material testing machine, and the green compact is pressed into a cylindrical shape, wherein the unidirectional pressure is 200 MPa and the pressure holding time is 1 min.
[0036] 3) The green compact is placed in a vacuum carbon ...
Example Embodiment
[0041] Example 2: A method for preparing titanium foam for cancellous bone includes the following steps:
[0042] 1) Mixing of raw materials: select titanium powder and needle-shaped crystalline urea particles with a particle size of 225-420μm and mix to obtain a preliminary mixture, wherein the mass ratio of titanium powder and pore former is 42.8:58.2;
[0043] 2) The preliminary mixture is unidirectionally pressed into a green compact using a 600KN universal material testing machine, and the green compact is pressed into a cylindrical shape, wherein the unidirectional pressure is 200 MPa and the pressure holding time is 1 min.
[0044] 3) The green compact is placed in a vacuum carbon tube furnace, sintered in an argon protective atmosphere at 1250°C for 2 hours to remove the pore former, and finally cooled with the furnace to obtain foamed titanium.
[0045] The foamed titanium prepared in Example 2 has a porosity of 74.2%, a compressive strength of 6.3 MPa, and a Young's modulus...
Example Embodiment
[0046] Example 3: A method for preparing titanium foam for cancellous bone includes the following steps:
[0047] 1) Mixing of raw materials: select titanium powder and acicular crystalline urea particles with a particle size of 225-420μm and mix to obtain a preliminary mixture. The mass ratio of titanium powder and pore former is 44.1:55.9;
[0048] 2) The preliminary mixture is unidirectionally pressed into a green compact using a 600KN universal material testing machine, and the green compact is pressed into a cylindrical shape with a unidirectional pressure of 250 MPa and a pressure holding time of 1 min.
[0049] 3) The green compact is placed in a vacuum carbon tube furnace, sintered in an argon protective atmosphere at 1300°C for 2 hours to remove the pore former, and finally cooled with the furnace to obtain foamed titanium.
[0050] The foamed titanium prepared in Example 3 has a porosity of 73.6%, a compressive strength of 8.3 MPa, and a Young's modulus of 0.25 GPa.
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