NiTi-based alloy material, method for producing NiTi-based alloy material, and wire or pipe formed from NiTi-based alloy material
A kind of alloy material and alloy technology, applied in the direction of catheter, prosthesis, surgery, etc., can solve the problems of raw material procurement cost, mass production, etc., and achieve the effect of excellent fatigue durability
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
no. 1 Embodiment approach
[0031] [First embodiment (NiTi-based alloy material)]
[0032] The NiTi-based alloy material according to the first embodiment is a NiTi-based alloy material that contains a NiTi-based alloy and has non-metallic inclusions in a parent phase having a B2-type crystal structure, and 99% by mass or more of the non-metallic inclusions contain NaCl The TiC-based inclusions having a TiC-based crystal structure have a lattice mismatch degree (δ) represented by the following formula (1) of the TiC-based inclusions in the range of 0.4238 to 0.4259.
[0033] δ=(a1-a2) / a2...Formula (1)
[0034] where a1 is the lattice constant of TiC-based inclusions a2 is the lattice constant of the parent phase
[0035] The aforementioned NiTi-based alloy material is mainly composed of a parent phase (matrix) and non-metallic inclusions present in the parent phase.
[0036] In addition, the NiTi-based alloy material described above preferably has superelastic properties.
[0037] In addition, in ...
no. 2 Embodiment approach
[0068] [Second embodiment (manufacturing method of NiTi-based alloy material)]
[0069]In the method for producing a NiTi-based alloy material according to the second embodiment, at least a melting and casting step (step 1), a hot working step (step 2), a cold working step (step 3), and an annealing step ( Step 4), and the heat treatment step for imparting superelasticity (step 5), the carbon concentration ([C]) and oxygen concentration ([O]) in the NiTi-based alloy ingot obtained in the above-mentioned melting and casting step (step 1) Both are 0.04% by mass or less, and the ratio of the above-mentioned carbon concentration ([C]) to the oxygen concentration ([O]) ([C] / [O] ratio) is 0.5 or more, and the above-mentioned thermal processing step (step 2) Herein, the heating temperature of the NiTi-based alloy raw material is 500° C. or more and 800° C. or less.
[0070]
[0071] The melting / casting step (step 1) is a step in which NiTi-based alloy raw materials are melted and ...
no. 3 Embodiment approach
[0093] [Third Embodiment (Use of NiTi-based Alloy Material of the Present Disclosure)]
[0094] A third embodiment is a wire or pipe formed using the above-mentioned NiTi-based alloy material. In particular, NiTi-based alloy materials having superelastic properties can be applied to, for example, tubes that can be used to form medical devices such as stents and artificial heart valves, wires that can be used to form guide wires (which can be used to insert stents and catheters into the body), etc. , is expected to be widely used in applications requiring high fatigue durability. It should be noted that the wires referred to here include not only round wires but also rectangular wires (preferably having an aspect ratio of 2 or less).
PUM
| Property | Measurement | Unit |
|---|---|---|
| fatigue limit | aaaaa | aaaaa |
| diameter | aaaaa | aaaaa |
| diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More