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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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.
Technology Topic
Short cycleRapid prototyping +12
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Property | Measurement | Unit |
Thickness | 20.0 | µm |
Thickness | 10.0 | µm |
Thickness | 15.0 | µm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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