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Preparation method of porous NiTi alloy

A technology of alloy and mixed powder, which is applied in the preparation of porous NiTi alloy. The self-propagating process is used to prepare porous NiTi alloy. It can solve the problems of many heterogeneous phases, uneven pore structure, and difficult reaction control, etc., and achieve high porosity, Uniform pore size effect

Active Publication Date: 2018-10-12
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of non-uniform pore structure, difficult reaction control, and many impurity phases in the preparation of porous NiTi alloy by conventional SHS, the present invention provides a high porosity, uniform pore size, nearly spherical pore shape, high phase purity, and mechanical properties. Preparation method of porous NiTi with excellent superelasticity

Method used

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  • Preparation method of porous NiTi alloy
  • Preparation method of porous NiTi alloy

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Embodiment 1

[0026] Using Ti powder with a particle size of ≤75 microns and Ni powder with a particle size of ≤45 microns as raw materials, weigh the powders according to the molar ratio of Ni powder:Ti powder=50.5:49.5, put them into a conical mixer and mix for 8 hours to obtain Ni / Ti mixed powder; the gained Ni / Ti mixed powder is put into the ball mill tank, add the paraffin wax of Ni / Ti mixed powder gross mass 0.4%, ball mill 20h under the rotating speed of 400 rev / mins, cross 200 mesh sieves, obtain Ni / Ti mixed powder Ti ball mill powder; put Ni / Ti ball mill powder into a ceramic boat, put it into a vacuum furnace for degreasing, and maintain the vacuum degree in the furnace ≤1×10 during the whole degreasing period -1 MPa, degreasing temperature 200 ° C, degreasing time 3h, to obtain Ni / Ti degreasing powder; according to the mass ratio Ni / Ti degreasing powder: Ni / Ti mixed powder=30:70, put it in a cone mixer and mix for 8h to obtain Ni / Ti working powder; put Ni / Ti working powder int...

Embodiment 2

[0029] Using Ti powder with a particle size of ≤75 microns and Ni powder with a particle size of ≤45 microns as raw materials, weigh the powders according to the molar ratio of Ni powder:Ti powder=50.5:49.5, put them into a conical mixer and mix for 4 hours to obtain Ni / Ti mixed powder; the gained Ni / Ti mixed powder is put into a ball mill jar, add the stearic acid of Ni / Ti mixed powder gross mass 0.8%, ball mill 40h under the rotating speed of 300 rev / mins, cross 200 mesh sieves, obtain Ni / Ti ball milling powder; put the Ni / Ti ball milling powder into a ceramic boat, put it into a vacuum furnace for degreasing, and keep the vacuum degree in the furnace ≤1×10 during the whole degreasing period-1 MPa, degreasing temperature 300 ° C, degreasing time 1h, to obtain Ni / Ti degreasing powder; according to the mass ratio Ni / Ti degreasing powder: Ni / Ti mixed powder = 20:80, put it in a cone mixer and mix for 4 hours to obtain Ni / Ti working powder; put Ni / Ti working powder into a cyli...

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Abstract

A preparation method of a porous NiTi alloy includes the steps as follows: Ni powder and Ti powder are mixed in mole ratio, after a process control agent is added to Ni / Ti mixed powder, ball milling and screening are performed, and Ni / Ti ball-milled powder is obtained; Ni / Ti degreased powder is obtained under vacuum heating; the Ni / Ti degreased powder and the Ni / Ti mixed powder are mixed, and Ni / Ti working powder is obtained; the Ni / Ti working powder is contained in a steel cylinder and compacted through vibration, then redundant space in the steel cylinder is filled with steel sheets, the endopening of the steel cylinder is sealed and welded, and a steel capsule containing the Ni / Ti working powder is prepared; the steel capsule is arranged in a heating furnace and is heated at the constant heating speed, when the temperature of the steel capsule is changed suddenly, the steel capsule is taken out of the furnace rapidly, is immersed in water for cooling and is removed after being cooled, and the porous NiTi alloy is obtained. The porous NiTi alloy prepared with the method is high in porosity, uniform in hole diameter, high in phase purity and excellent in mechanical property and super-elasticity, the pore shape is close to the spherical shape, and the alloy can be used as an implant material for the human body hard tissue.

Description

technical field [0001] The invention relates to a method for preparing a porous NiTi alloy, in particular to a method for preparing a porous NiTi alloy by adopting a self-propagating process, and belongs to the technical field of powder metallurgy. Background technique [0002] With the development of science and technology, the aging of the population and the increase in trauma caused by various accidents, the clinical demand for human hard tissue implants and repair materials is increasing. Medical biomaterials have become an emerging pillar industry in the global industrial field, and it is estimated that it will continue to grow at an annual rate of about 10% in the next 10 to 20 years. Among them, medical metal implant materials are currently the main materials for human hard tissue implants in clinical practice, accounting for more than 40% of the market share of the entire medical biomaterial products. my country is the only country in the world with an aging populat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11B22F3/23C22C1/04C22C19/03
CPCB22F3/1143B22F3/23C22C1/0433C22C19/03
Inventor 闫志巧陈峰施麒陶麒鹦
Owner GUANGDONG INST OF NEW MATERIALS
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