发明授权
US08916091B2 Method for producing semi-finished products from NiTi shape memory alloys
有权
从NiTi形状记忆合金生产半成品的方法
- 专利标题: Method for producing semi-finished products from NiTi shape memory alloys
- 专利标题(中): 从NiTi形状记忆合金生产半成品的方法
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申请号: US12733867申请日: 2008-08-27
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公开(公告)号: US08916091B2公开(公告)日: 2014-12-23
- 发明人: Manuel Koehl , Martin Bram , Berthold Coenen , Hans Peter Buchkremer , Detlev Stoever
- 申请人: Manuel Koehl , Martin Bram , Berthold Coenen , Hans Peter Buchkremer , Detlev Stoever
- 申请人地址: DE Juelich
- 专利权人: Forschungszentrum Juelich GmbH
- 当前专利权人: Forschungszentrum Juelich GmbH
- 当前专利权人地址: DE Juelich
- 代理机构: Jordan and Hamburg LLP
- 优先权: DE102007047523 20071004
- 国际申请: PCT/DE2008/001427 WO 20080827
- 国际公布: WO2009/043323 WO 20090409
- 主分类号: B22F3/15
- IPC分类号: B22F3/15
摘要:
Disclosed is a method for producing semi-finished products from a shape memory alloy, particularly an NiTi shape memory alloy, wherein a powder is first produced from a shape memory alloy, and subsequently the powder is divided into a coarse fraction and a fine fraction in a separating cut T. While the fine fraction is required, in particular, for the production of a first semi-finished product, employing the metal injection molding (MIM) method, the coarse fraction can be used for the production of a second semi-finished product, employing the hot isostatic pressing (HIP) method. The advantages of the invention can be summarized as follows. The MIM method for producing semi-finished products from a shape memory alloy is qualitatively improved and more cost-effective to implement if the coarse fraction that is typically obtained during powder production, but not used for the MIM process, can advantageously be supplied to a further process, in this case the HIP process. Due to the use of particularly fine powder, the semi-finished products produced by way of the MIM method have an advantageous, powder-metallurgical microstructure. In particular, the alloying elements are distributed particularly homogeneously in these semi-finished products, casting flaws or segregations do not usually occur, no anisotropy of the structure occurs as a result of the processing steps, and ternary alloys can be processed, which due to the mechanical properties thereof, cannot be processed by way of conventional forming methods.
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