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Fatigue-Resistant Nitinol Instrument
专利权人:
William B. Johnson
发明人:
William B. Johnson
申请号:
US13510500
公开号:
US20120231414A1
申请日:
2010.11.17
申请国别(地区):
US
年份:
2012
代理人:
摘要:
A fatigue-resistant Nitinol instrument has a working portion in the deformed monoclinic martensitic state and an austenite finish temperature in the range of 40° to 60° C. Because the operating environment of the instrument is about 37° C., the working portion remains in the monoclinic martensitic state during its use. The relatively high austenite finish temperature and fatigue resistance is achieved by subjecting the nickel-titanium alloy to a final thermal heat treat in a temperature range of about 410° to 440° C. while the nickel-titanium alloy is under constant strain of about 3 to 15 kg. Further, the high austenite finish temperature is achieved without subjecting the alloy to thermal cycling to produce shape memory. Additionally, there are no intermediate processing steps occurring between obtaining a finished diameter of the wire or blank through cold working and the final thermal heat treat under constant strain.
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来源网址:
http://www.ckcest.cn/home/
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