PL403159A1 - Method for preparing oxide-nitride diffusion layers on components made of NiTi - Google Patents
Method for preparing oxide-nitride diffusion layers on components made of NiTiInfo
- Publication number
- PL403159A1 PL403159A1 PL403159A PL40315913A PL403159A1 PL 403159 A1 PL403159 A1 PL 403159A1 PL 403159 A PL403159 A PL 403159A PL 40315913 A PL40315913 A PL 40315913A PL 403159 A1 PL403159 A1 PL 403159A1
- Authority
- PL
- Poland
- Prior art keywords
- stage
- niti
- oxide
- nitride
- temperature
- Prior art date
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Materials For Medical Uses (AREA)
Abstract
Przedmiotem wynalazku jest sposób wytwarzania dyfuzyjnych tlenkowo-azotkowych warstw wierzchnich na elementach wykonanych ze stopu NiTi, zdolnych do odkształceń mechanicznych związanych z indukowaniem efektów pamięci kształtu, warunkujących poprawę właściwości korozyjnych i mechanicznych stopu. Element ze stopu NiTi o składzie chemicznym zbliżonym do równoatomowego poddaje się w pierwszym etapie procesowi azotowania jarzeniowego w atmosferze mieszaniny gazów N2 i H2, gdzie zawartość H2 wynosi od 3% do 6%, a następnie w drugim etapie do komory reakcyjnej zawierającej jedynie N2 wprowadza się powietrze w ilości od 25% do 50% w stosunku do N2, poddając element procesowi tlenoazotowania jarzeniowego. Obydwa etapy prowadzi się w temperaturze od 250 do 350°C, stosując ciśnienie mieszaniny gazów o wartości od 2.0 do 4,5 hPa, w czasie łącznym od 15 do 60 min., z czego pierwszy etap prowadzi się w czasie od 8 min do 15 min, po czym w trzecim etapie element z wytworzoną na nim dyfuzyjną tlenkowo-azotkową warstwą wierzchnią chłodzi się od temperatury procesu do temperatury otoczenia, w atmosferze gazu ochronnego, korzystnie azotu. Sposób pozwala na obróbkę powierzchniową implantów NiTi o bardzo skomplikowanych kształtach i wytworzenie na nich warstwy tlenku i azotku tytanu o łącznej grubości do 20-60 nm i strukturze amorficzno-nanokrystalicznej.The subject of the invention is a method of producing diffusive oxide-nitride surface layers on elements made of NiTi alloy, capable of mechanical deformations associated with the induction of shape memory effects, conditioning the corrosion and mechanical properties of the alloy. At first stage, a NiTi alloy element with a chemical composition similar to equatomic is subjected to a process of glow discharge nitriding in an atmosphere of a mixture of N2 and H2 gases, where the H2 content is from 3% to 6%, and then in the second stage to the reaction chamber containing only N2 is introduced air in the amount of 25% to 50% in relation to N2, subjecting the element to the process of glow nitriding. Both stages are carried out at a temperature of 250 to 350 ° C, using a gas mixture pressure of 2.0 to 4.5 hPa, for a total time of 15 to 60 min, of which the first stage is carried out for a period of 8 min to 15 min, after which in the third stage the element with the diffusion oxide-nitride surface layer formed on it is cooled from the process temperature to ambient temperature in a protective gas atmosphere, preferably nitrogen. The method allows surface treatment of NiTi implants with very complicated shapes and creating on them a layer of titanium oxide and nitride with a total thickness of up to 20-60 nm and an amorphous-nanocrystalline structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL403159A PL221821B1 (en) | 2013-03-15 | 2013-03-15 | Method for preparing oxide-nitride diffusion layers on components made of NiTi |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL403159A PL221821B1 (en) | 2013-03-15 | 2013-03-15 | Method for preparing oxide-nitride diffusion layers on components made of NiTi |
Publications (2)
Publication Number | Publication Date |
---|---|
PL403159A1 true PL403159A1 (en) | 2014-09-29 |
PL221821B1 PL221821B1 (en) | 2016-05-31 |
Family
ID=51588824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PL403159A PL221821B1 (en) | 2013-03-15 | 2013-03-15 | Method for preparing oxide-nitride diffusion layers on components made of NiTi |
Country Status (1)
Country | Link |
---|---|
PL (1) | PL221821B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105506540A (en) * | 2015-12-09 | 2016-04-20 | 常州大学 | Surface modification treatment method combining pre-oxidizing, ion nitriding and ion oxynitriding |
-
2013
- 2013-03-15 PL PL403159A patent/PL221821B1/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105506540A (en) * | 2015-12-09 | 2016-04-20 | 常州大学 | Surface modification treatment method combining pre-oxidizing, ion nitriding and ion oxynitriding |
CN105506540B (en) * | 2015-12-09 | 2019-03-22 | 常州大学 | A kind of pre-oxidation, glow discharge nitriding, three step duplex surface modification processing method of ionic nitrogen oxygen permeation |
Also Published As
Publication number | Publication date |
---|---|
PL221821B1 (en) | 2016-05-31 |
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