Method for preparing medical porous NiTi shape memory alloy by microwave sintering
A technology of microwave sintering and memory alloy, which is applied in the field of microwave sintering to prepare medical porous NiTi shape memory alloy, which achieves the effects of short sintering cycle, low energy consumption, and simple and convenient preparation method
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specific Embodiment approach 1
[0017] Specific embodiment 1: The method for preparing medical porous NiTi shape memory alloy by microwave sintering in this embodiment is carried out according to the following steps: (1) Powder mixing: titanium powder and nickel powder are mixed in a certain proportion; (2) Ball milling: prepared powder Put into a stainless steel ball milling tank for ball milling; (3) Green compact: the powder after ball milling is molded into compacts under a pressure of 50~500MPa; (4) Furnace: Place the obtained compacts and microwave-assisted heating materials in multiple In the crystal mullite fiber insulation barrel, put the insulation barrel into the microwave sintering furnace; (5) Microwave sintering: After the vacuum degree in the furnace cavity is pumped to less than 0.1 Pa, it is filled with argon with a purity of 99.999% to control The output power of the microwave sintering furnace is microwave sintered at a certain heating rate, sintering temperature and holding time, and the id...
specific Embodiment approach 2
[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is: Step (1) The atomic percentage of nickel and titanium in the ingredients is (55.5:44.5)~(56.5:43.5), and the purity of titanium powder and nickel powder All are above 99.5%, and the particle size is 1~200μm. The other steps and selected parameters are the same as in the first embodiment.
specific Embodiment approach 3
[0020] Embodiment 3: The difference between this embodiment and the first embodiment is: the powder preparation in step (1) can also add a pore former, which can be titanium hydride, ammonium bicarbonate, urea or hard Fatty acid, the purity is greater than 90%, the particle size is 1~800μm, and the mass percentage in the ingredients is 0.1~70%. The other steps and selected parameters are the same as in the first embodiment.
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