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A kind of layered ti-ni shape memory composite material and preparation method thereof

A composite material and memory technology, which is applied in the field of layered Ti-Ni shape memory composite materials and its preparation, can solve the problems of poor mechanical properties, weak interface bonding of shape memory alloy wire filled shape memory composite materials, etc., and achieve high fatigue strength , good biocompatibility and excellent electrical conductivity

Active Publication Date: 2017-09-01
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects and deficiencies in the prior art, the present invention provides a layered Ti-Ni shape memory composite material and its preparation method, which solves the problem of poor mechanical properties of existing titanium-nickel shape memory polymers and shape memory alloy wire filling. Problems of Weak Interfacial Bonding in Shape Memory Composites

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  • A kind of layered ti-ni shape memory composite material and preparation method thereof
  • A kind of layered ti-ni shape memory composite material and preparation method thereof
  • A kind of layered ti-ni shape memory composite material and preparation method thereof

Examples

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Embodiment 1

[0032] This example provides a layered Ti-Ni shape memory composite material with a TiNi phase volume content of 15%, which is obtained through the following steps:

[0033] (1) Take two industrial pure titanium plates and one pure nickel plate with a size of 100mm×75mm×0.7mm, soak the titanium and nickel plates in acetone for 30 minutes, polish the contact surface with a water grinder and clean them with alcohol, and use Ti / Ni / Ti structures stacked together;

[0034] (2) Preheat the above-mentioned stacked materials in a vacuum resistance furnace at 400-500°C for 8-10 minutes, and then immediately perform single-pass rolling compounding at a reduction of 50%-60%, and then roll The obtained composite plate is cut into two halves from the middle along the width direction, and the cut composite plate is subjected to repeated surface treatment, preheating, rolling, and three passes of cumulative composite rolling;

[0035] (3) The clad plate obtained by cumulative clad rolling ...

Embodiment 2

[0040] This example provides a layered Ti-Ni shape memory composite material with a TiNi phase volume content of 30%. The specific implementation method is: change the diffusion annealing process in Example 1 to annealing at 900°C for 3 hours, and keep other processes unchanged. The interface microstructure of the obtained composite is as follows: Figure 5 As shown, it can be seen that the thickness of the TiNi phase layer is obviously wider. The thickness of the TiNi phase layer is about 50 μm, and the total thickness of the eight layers is 400 μm, accounting for about 30% of the composite material. At this time, the stress-strain curve of the composite material is as follows Figure 6 As shown, the yield strength is 202.4MPa, the tensile strength is 376.4MPa, and the elongation at break is about 14%.

Embodiment 3

[0042] This example provides a layered Ti-Ni shape memory composite material with a TiNi phase volume content of 50%. The specific implementation method is: change the diffusion annealing process in Example 1 to annealing at 900°C for 12 hours, and keep other processes unchanged. Change the diffusion annealing process in Example 1 to annealing at 900 °C for 12 h, and keep other processes unchanged, the interface microstructure of the obtained composite material is as follows Figure 7 As shown, the measured thickness of the TiNi phase layer is about 80 μm, and the total thickness of the eight layers is 640 μm, accounting for about 50% of the composite material; at this time, the stress-strain curve of the composite material is as follows Figure 8As shown, the yield strength is 244MPa, the tensile strength is 435.8MPa, and the elongation at break is about 14%. It can be seen that with the increase of the diffusion annealing temperature (compared with Example 1) and the increas...

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Abstract

This invention discloses a layered Ti-Ni shape memory composite material and its preparation method, which belongs to the technical field of preparation of functional composite materials; pure titanium and pure nickel are the initial raw materials, and the titanium plate and nickel plate are subjected to surface pretreatment, accumulated Composite rolling, diffusion annealing, and controlled cooling are used to prepare a heterogeneous multi-layer structure shape memory composite material including a Ti layer as the outermost layer, a Ti-Ni layer wrapped in the Ti layer, and a Ni layer. The shape memory composite material prepared by the method has the characteristics of high specific strength, good plastic toughness, high fatigue strength, strong interfacial bonding, excellent electrical conductivity, non-magnetic, non-toxic, high corrosion resistance, good biocompatibility and the like. The preparation method of the invention has the advantages of simple process and convenient operation.

Description

technical field [0001] The invention belongs to the field of functional composite materials, and in particular relates to a layered Ti-Ni shape memory composite material and a preparation method thereof. [0002] technical background [0003] As a functional material, titanium / nickel shape memory materials are widely used in aviation, military, industry, agriculture, medical and other fields. Their application value is mainly reflected in the shape memory effect and superelasticity. , It should also have the characteristics of high specific strength, non-magnetic, non-toxic, high corrosion resistance and wear resistance, good damping performance, high fatigue strength, good biocompatibility and low biodegeneration. However, it is difficult for the existing shape memory alloys to fully balance the above characteristics at the same time, and most of the research on shape memory composite materials is focused on shape memory polymers, or composited with millimeter-scale shape me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01B21B1/38
CPCB21B1/38B21B2001/386B32B15/01B32B2250/40B32B2307/202B32B2307/552B32B2307/558B32B2307/714
Inventor 张兵王乐王快社王文张仁杰张巡辉
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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