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将镍钛记忆合金熔合到不锈钢的焊接技术 - China Medical Device Manufacturer
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Sat, January 20th, 2018

2007 夏季刊 » 行业新闻
将镍钛记忆合金熔合到不锈钢的焊接技术

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爱尔兰的一家公司成功研发出结合镍钛诺和不锈钢的焊接方法。
爱尔兰Creganna医疗器械公司(www.creganna.com)的工程师花了3年时间,想办法将镍钛记忆合金与不锈钢接合,以制造出一种拥有镍钛记忆合金功能,但是价格低廉的导管。在过去的一年里,该公司终于开发出一种焊接技术,可解决困扰制造商多年的问题。

镍钛记忆合金焊接到不锈钢时,焊接区内常会产生金属间化合物,引起脆性接合,因此操作困难。一般的解决办法是透过卷边或型锻、粘合及热收缩等机械过程,将镍钛记忆合金和不同的金属进行接合。但是该公司表示,这种操作无法实现焊接所达到的接合区强度。Creganna的熔合技术将一种填充材料加入接合区,避免了金属间化合物的干扰,从而确保了接合处的牢固。

Creganna的业务拓展经理Alan Crean表示:“我们开发出能将这两种原料熔合到一起的方法。这对于设计工程师来说,算是很了不起的一项成就。”

在设计导管的时候,尽管镍钛记忆合金有理想属性,工程师却总是偏好更经济的材料。Creganna的接合技术可以使导管在拥有镍钛记忆合金优点的同时又保证成本低廉。

除了形状记忆特性外,镍钛记忆合金还有抗压、超弹性及柔韧性优点。由于这些特性,该合金特别适用于在导管的远端部分使用,因为这一端是首先进入患者体内的。熔合技术使工程师能够仅在导管的远端使用镍钛记忆合金。该公司称,采用这种设计方法,100mm镍钛记忆合金就可以生产出一到两米的导管材料,降低了材料成本。装置的其余近端部分可以采用该公司的技术构成,将便宜的合金,如不锈钢,接合到镍钛记忆合金上。

作为目前唯一一家拥有此项技术的公司,Creganna对于如何熔合不同金属一直保密。但是,该公司透露,中间的焊接材料是一般的医用级材料,因此它不会给OEM们带来任何新的难题。此技术与一次性植入式装置有完全的生物相容性,可以耐受300到370Mpa的拉力,接合处应力为0.5%至1.5%,接合处硬度最大值为410Hv。


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