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Method for synthesizing NiTi shape memory alloy porous material

A porous body and alloy technology, applied in the field of injection molding - self-propagating high-temperature synthesis of NiTi alloy porous body materials, can solve complex forming and other problems, and achieve the effect of meeting the strength requirements

Inactive Publication Date: 2004-10-20
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0010] The invention provides a method for preparing NiTi porous material by combining metal injection molding and self-propagating high-temperature synthesis, which solves the forming problem of complex shapes

Method used

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  • Method for synthesizing NiTi shape memory alloy porous material
  • Method for synthesizing NiTi shape memory alloy porous material
  • Method for synthesizing NiTi shape memory alloy porous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Use 10-100 μm Ti powder and 10-100 μm Ni powder as raw materials, weigh them according to the atomic ratio of Ti and Ni 1:1 (mass ratio 44.93:55.07), then put them into a ball mill jar, and put them into a stainless steel with a diameter of 5-20mm Balls (the ratio of ball to material is about 1:1) are used for mixing, and the raw material powder is mixed evenly by dry mixing on a ball mill for 2 hours.

[0019] A paraffin-based binder is selected, and the metal powder and the binder are mixed on a mixer according to the volume of the metal powder accounting for 55%, and the mixing temperature is 135° C., and then crushed into feed for injection.

[0020] The feed material is injection molded on the injection molding machine, the injection temperature is 145°C, and the obtained Φ7×120mm 2 An injection blank in the shape of a long cylinder.

[0021] The injection blank is immersed in gasoline for solvent degreasing, and the degreasing time is 24 hours. Then the blank af...

Embodiment 2

[0025] The operation method and process conditions are basically the same as those in Example 1, except that the preheating temperature before the self-propagating high-temperature synthesis reaction is 500°C.

[0026] The NiTi alloy porous body prepared by this process has a porosity of 58.5%, an open porosity of 91.0%, a compressive strength of 107.5MPa and a compressible strain of 2.07% when compressed, and a corresponding tensile fracture stress of 78.5MPa, The elongation is 6.5%, and the modulus of elasticity is 4.1Gpa.

[0027] The SEM photo of the NiTi alloy porous body prepared by this process is shown in figure 2 .

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Abstract

The method for synthesizing NiTi marmen porous body material is characterized by that it uses Ti powder and Ni powder as raw material, and includes the following steps: uniformly mixing the above-mentioned raw materials, mixing them with adhesive in mixing machine, granulating to obtain feeding material, injecting to obtain blank piece, soaking said blank piece in gasoline to remove grease, drying and placing the blank into vacuum furnace to make thermal grease removal, finally connecting one end of blank with W spiral in flame igniter, placing it into vacuum reaction synthesizer, when the degree of vacuum is higher than 1X10(-2)Pa, starting heating, after the temp. is up to defined value, starting flame igniter so as to produce self-spreading high-temp. synthesis reaction to obtain finished product.

Description

technical field [0001] The invention belongs to the technical field of injection molding-self-propagating high-temperature synthesis (abbreviated as SHS) NiTi alloy, and in particular provides a method for injection molding-self-propagating high-temperature synthesis of NiTi alloy porous body material. Background technique [0002] Self-propagating high-temperature synthesis is a new technology for preparing materials by exothermic chemical reaction itself. SHS is a new material synthesis method developed by the former Soviet Union in the 1960s. Its most notable feature is to make full use of the high-energy exothermic reaction when forming compounds between elements. In addition to the small amount of external energy necessary to initiate the synthesis reaction, the entire The reaction process is mainly maintained by the heat release of the material itself. Therefore, it can greatly save energy. In addition, it also has outstanding advantages such as short synthesis time,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11B22F3/22B22F3/23C22C1/04C22C1/08C22C14/00C22C19/00
Inventor 郭志猛曲选辉陈存敬高峰罗骥
Owner UNIV OF SCI & TECH BEIJING
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