Method for synthesizing arbitrarily shaped NiTi shape memory alloy in situ

A memory alloy, in-situ synthesis technology, applied in the field of nickel-titanium shape memory alloys, can solve the problem of synthesis differences, adverse effects of material properties, and difficulty in suppressing intermediate equivalence, and achieve the effect of ensuring uniformity

Active Publication Date: 2010-12-01
TECH LASER TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis of NiTi shape memory alloy by powder metallurgy is a kind of in-situ synthesis. One of the biggest difficulties in the above synthesis method is that it is difficult to accurately control the formation and reaction speed of reactants everywhere, and there are significant differences in the synthesis

Method used

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Examples

Experimental program
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Example Embodiment

[0024] Example 1:

[0025] A method for directly preparing NiTi shape memory alloys of arbitrary shapes from element powders, including the following steps:

[0026] (1) Powder preparation: use pure Ni powder and pure Ti powder with a particle size of less than 50μm and the same average particle size as raw materials, and mix uniformly according to the Ni / Ti atomic ratio of 51:49;

[0027] (2) Use selective laser melting rapid prototyping method to prepare NiTi shape memory alloy of arbitrary shape:

[0028] (2.1) The mixed powder with the atomic ratio of Ni / Ti of 51:49 is used as the raw material, continuous YAG or fiber laser is used as the energy source, the focal spot diameter is 40μm, and the titanium plate is used as the forming substrate to form any three-dimensional The graphic STL file is input to the SLM rapid prototyping equipment, which is layered and discretized by the slice software to generate the laser scanning path;

[0029] (2.2) A layer of Ni-Ti mixed powder with a t...

Example Embodiment

[0032] Example 2:

[0033] A method for directly preparing NiTi shape memory alloys of arbitrary shapes from element powders, including the following steps:

[0034] (1) Powder preparation: use pure Ni powder and pure Ti powder with a particle size of less than 50μm and the same average particle size as raw materials, and mix uniformly according to the Ni / Ti atomic ratio of 50.5:49.5;

[0035] (2) Use selective laser melting rapid prototyping method to prepare NiTi shape memory alloy of arbitrary shape:

[0036] (2.1) The mixed powder with the atomic ratio of Ni / Ti of 50.5:49.5 is used as the raw material, continuous YAG or fiber laser is used as the energy source, the focal spot diameter is 25μm, and the titanium plate is used as the forming substrate to transform any three-dimensional The graphic STL file is input to the SLM rapid prototyping equipment, which is layered and discretized by the slicing software to generate the laser scanning path;

[0037] (2.2) A layer of Ni-Ti mixed ...

Example Embodiment

[0040] Example 3:

[0041] A method for directly preparing NiTi shape memory alloys of arbitrary shapes from element powders, including the following steps:

[0042] (1) Powder preparation: use pure Ni powder and pure Ti powder with a particle size of less than 50μm and the same average particle size as raw materials, and mix uniformly according to the Ni / Ti atomic ratio of 50:50;

[0043] (2) Use selective laser melting rapid prototyping method to prepare NiTi shape memory alloy of arbitrary shape:

[0044] (2.1) The mixed powder with the atomic ratio of Ni / Ti of 50:50 is used as the raw material, continuous YAG or fiber laser is used as the energy source, the focal spot diameter is 30μm, and the titanium plate is used as the forming substrate. The graphic STL file is input to the SLM rapid prototyping equipment, which is layered and discretized by the slicing software to generate the laser scanning path;

[0045] (2.2) A layer of Ni-Ti mixed powder with a thickness of 20μm is preset ...

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Abstract

The invention discloses a method for synthesizing an arbitrarily shaped NiTi shape memory alloy in situ. The method comprises the following steps of: uniformly mixing pure Ti powder and pure Ni powder with the grain size of less than 50 mu m and the same mean grain size according to an approximate equiatomic proportion, and preconfiguring mixed powder layers with the thickness of 10 to 20 mu m on a pure Ti metal substrate layer by layer by utilizing a selective laser melting rapid prototyping method; and melting mixed powder point by point, line by line and layer by layer by utilizing a continuous YAG or a fiber laser with the focusing spot diameter of less than or equal to 40 mu m under the protection condition of the water and oxygen content of less than 10 ppm, and finishing the in-situ synthesis and the melting stacking processing of the NiTi shape memory alloy in a designed shape. The invention can overcome the difficulties of the prior art, and provides the method with short cycle, low cost, high flexibility, and capacity of synthesizing the arbitrarily shaped NiTi shape memory alloy with the consistency of near 100 percent and without composition segregation and impurities.

Description

technical field [0001] The invention belongs to the field of nickel-titanium shape-memory alloys, and in particular relates to a method for rapidly synthesizing nickel-titanium shape-memory alloys by a selective laser melting technique. Background technique [0002] Nearly equal atomic ratio NiTi shape memory alloys have stable shape memory effect and superelastic function, as well as excellent strength, wear resistance, corrosion resistance and biocompatibility, etc., in industrial automation, aerospace, medical and health, It has wide application prospects in the fields of instrumentation and machinery manufacturing. [0003] Due to the high melting point and remarkable work hardening characteristics of NiTi alloy, its preparation technology and parts processing have been paid much attention. At present, there are two methods for the preparation of NiTi shape memory alloys. One is the melting and casting method: the bulk raw materials of Ni and Ti are first melted into in...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C14/00C22C1/04
Inventor 王泽敏曾晓雁曹宇关凯
Owner TECH LASER TECH SHANGHAI CO LTD
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