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

Inactive Publication Date: 2012-07-04
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of preparing medical porous NiTi shape memory alloy by microwave sintering at home and abroad so far, and provide a method for preparing medical porous NiTi shape memory alloy by microwave sintering

Method used

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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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Abstract

The invention relates to a method for preparing a medical porous NiTi shape memory alloy by microwave sintering. The method comprises the following steps of: (1) compounding powder: compounding titanium powder, nickel powder and pore-forming agent powder according to certain mass percentage; (2) performing ball milling: putting the compounded powder body into a stainless steel ball milling pot for ball milling; (3) pressing billets: performing mold pressing on the powder materials after the ball milling at the pressure of between 50 and 500 MPa into pressed billets; (4) charging in a furnace:putting the obtained pressed billets and a microwave auxiliary heating material into a polycrystalline mullite fiber heat insulation barrel, and putting the heat insulation barrel into a microwave sintering furnace; and (5) performing microwave sintering. The method has the advantages that: the preparation method is simple and convenient, the sintering cycle is short, the energy consumption is low, the method is suitable for industrialized production, the porous NiTi shape memory alloy obtained by sintering has good mechanical properties, a pore structure is in three-dimensional communication, the pore ratio is controllable between 20 and 80 percent, the pore sizes are uniform and are controllable between 30 and 600 mu m, and the medical porous NiTi shape memory alloy can be used as materials for repairing and replacing hard tissues such as bones, joints, artificial tooth roots and the like.

Description

Technical field [0001] The invention relates to a method for preparing metal material powder metallurgy, in particular to a method for preparing medical porous NiTi shape memory alloy by microwave sintering. Background technique [0002] Porous NiTi shape memory alloy has the characteristics of shape memory effect, super elasticity, controllable mechanical properties, porous structure makes the fixation of the implant more reliable, facilitates the transmission of body fluid nutrients and shortens the patient’s recovery period, making it a bone One of the research hotspots in the repair and replacement of surgical implant materials for hard tissues such as joints and teeth. At present, powder metallurgy methods are mainly used to prepare porous NiTi shape memory alloys, including element powder mixed sintering method (conventional sintering method), hot isostatic pressing (HIP) and self-propagating high temperature synthesis (SHS). Although these technologies can produce porous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08B22F3/10
Inventor 徐吉林罗军明钟震晨马胜灿
Owner NANCHANG HANGKONG UNIVERSITY
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