CN101063221A - Method for differential arc oxidation treatment of Nickel-titanium alloy for medical purpose - Google Patents
Method for differential arc oxidation treatment of Nickel-titanium alloy for medical purpose Download PDFInfo
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- CN101063221A CN101063221A CN 200710072214 CN200710072214A CN101063221A CN 101063221 A CN101063221 A CN 101063221A CN 200710072214 CN200710072214 CN 200710072214 CN 200710072214 A CN200710072214 A CN 200710072214A CN 101063221 A CN101063221 A CN 101063221A
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Abstract
The invention discloses a method of medical nickel titanium alloy differential arc oxidation treatment, which comprises the following steps: (1) pre-treating surface; (2) putting into hydraulic fluid; choosing NiTi ally as positive pole and loading trough as negative pole; treating; (3)washing; drying; getting the product. This invention possesses simple method, which can inhibit discharging of Ni ion in nickel titanium alloy and reinforce safety.
Description
Technical field
The present invention relates to the method that a kind of alloy differential arc oxidation is handled.
Background technology
NiTi (NiTi) alloy has excellent properties such as shape memory effect, super-elasticity, and to be widely used in each section of medical science such as dentistry, orthopaedics and cardiology department clinical because of it.But the content height of Ni in the medical NiTi alloy, Ni accounts for 50.5%～51.5% of alloy atom per-cent, after studies show that the Nickel-titanium alloy for medical purpose implant into body, corrosion causes the Ni ion to separate out because body fluid is to implant surfaces, because Ni ion stripping, alloy surface is corroded and produces loose responding layer, aggravated the wearing and tearing of material surface, and the abrasive dust that wearing and tearing produce can have a strong impact on the biological safety of implant.As everyone knows, nickel is the bio-toxicity element, and the Ni ion has the potential carcinogenesis, so the NiTi alloy has been subjected to query in medical field application and development.
Differential arc oxidation is that valve metals such as Ti, Mg, Al or its alloy are placed aqueous electrolyte liquid, utilize electrochemical method, produce the spark discharge spot in the surface micropore of this material, under thermochemistry, plasma chemistry and electrochemical acting in conjunction, original position generates the method for ceramic membrane.Because the atomic percent of nickel is near 50% in the medical NiTi alloy, and Ni also is not valve metal, so also directly do not carry out the report that differential arc oxidation is handled about medical NiTi alloy both at home and abroad up to now.
Summary of the invention
The objective of the invention is also directly not carry out the problem that differential arc oxidation is handled both at home and abroad about medical NiTi alloy in order to solve up to now, and the method that a kind of Nickel-titanium alloy for medical purpose differential arc oxidation that provides is handled.
The Nickel-titanium alloy for medical purpose differential arc oxidation is handled and is carried out according to the following steps: the surface preparation of (one) Nickel-titanium alloy for medical purpose; (2) will put into working fluid through pretreated Nickel-titanium alloy for medical purpose, with the NiTi alloy is that positive pole, work nest are negative pole, and control working fluid temperature is 10～40 ℃, is that 200～600V, negative pulse voltage are that 0～300V, positive negative pulse stuffing operating frequency are to handle 5～60min under the condition of 30～3000Hz at bidirectional pulse power supply, positive pulse voltage; (3) 3～4 after drying of NiTi alloy distilled water flushing promptly obtain the Nickel-titanium alloy for medical purpose that handle through differential arc oxidation on the surface; Wherein working fluid is acidity or alkaline system described in the step (two), and every liter of acid system working fluid comprises 2～10mL phosphoric acid, 1～10g titanium dioxide and 10～100mL ethanol, and the alkaline system working fluid is water glass, sodium aluminate or sodium phosphate system.
The present invention can directly carry out differential arc oxidation on the Nickel-titanium alloy for medical purpose surface and generate ceramic layer, and the bonding strength of ceramic layer and Nickel-titanium alloy for medical purpose is difficult for peeling off, coming off the biological safety height greater than 30MPa; Arc differential oxide ceramic layer thickness evenly is 1～20 μ m, has erosion resistance and wear resistance; And through the Nickel-titanium alloy for medical purpose of differential arc oxidation after testing its mechanical property do not reduce.Nickel-titanium alloy for medical purpose carries out electrochemical corrosion test in Hank ' s simulated body fluid finds, after differential arc oxidation was handled, corrosion voltage had improved 0.05～0.2V, and corrosion current has reduced by 1～3 order of magnitude.Nickel-titanium alloy for medical purpose is 0.4～0.6 with the GCr15 steel ball to the frictional coefficient of mill directly, and Nickel-titanium alloy for medical purpose and GCr15 steel ball that the present invention handles through differential arc oxidation reduce to 0.2～0.3 to the frictional coefficient that grinds.
Differential arc oxidation method of the present invention is simple, is not subjected to the influence of Nickel-titanium alloy for medical purpose workpiece shape, environmentally safe, and suppressed Ni ionic release in the Ni-Ti alloy effectively, strengthened biological safety.
Embodiment
Embodiment one: present embodiment Nickel-titanium alloy for medical purpose differential arc oxidation is handled and is carried out according to the following steps: the surface preparation of (one) Nickel-titanium alloy for medical purpose; (2) will put into working fluid through pretreated Nickel-titanium alloy for medical purpose, with the NiTi alloy is that positive pole, work nest are negative pole, and control working fluid temperature is 10～40 ℃, is that 200～600V, negative pulse voltage are that 0～300V, positive negative pulse stuffing operating frequency are to handle 5～60min under the condition of 30～3000Hz at bidirectional pulse power supply, positive pulse voltage; (3) 3～4 after drying of NiTi alloy distilled water flushing promptly obtain the Nickel-titanium alloy for medical purpose that handle through differential arc oxidation on the surface; Wherein working fluid is acidity or alkaline system described in the step (two), and every liter of acid system working fluid comprises 2～10mL phosphoric acid, 1～10g titanium dioxide and 10～100mL ethanol, and the alkaline system working fluid is water glass, sodium aluminate or sodium phosphate system.
The arc differential oxide ceramic layer on present embodiment Nickel-titanium alloy for medical purpose surface and the bonding strength of Nickel-titanium alloy for medical purpose are difficult for peeling off, coming off greater than 30MPa, and arc differential oxide ceramic layer thickness evenly is 1～20 μ m, has erosion resistance and wear resistance; And through the Nickel-titanium alloy for medical purpose of differential arc oxidation after testing its mechanical property do not reduce.Nickel-titanium alloy for medical purpose carries out electrochemical corrosion test in Hank ' s simulated body fluid finds, after differential arc oxidation was handled, corrosion voltage had improved 0.05～0.2V, and corrosion current has reduced by 1～3 order of magnitude.Nickel-titanium alloy for medical purpose is 0.4～0.6 with the GCr15 steel ball to the frictional coefficient of mill directly, and Nickel-titanium alloy for medical purpose and GCr15 steel ball that present embodiment is handled through differential arc oxidation reduce to 0.2～0.3 to the frictional coefficient that grinds.
The present embodiment method is simple, is not subjected to the influence of Nickel-titanium alloy for medical purpose workpiece shape, environmentally safe, and suppressed Ni ionic release in the Ni-Ti alloy effectively.
Embodiment two: the difference of present embodiment and embodiment one is: the surface preparation of step () Nickel-titanium alloy for medical purpose is followed successively by and deoils, SiC sand papering and ultrasonic cleaning.Other step and selected parameter are identical with embodiment one.
Embodiment three: the difference of present embodiment and embodiment one is: work nest is made by stainless steel in the step (two).Other step and selected parameter are identical with embodiment one.
Embodiment four: the difference of present embodiment and embodiment one is: seasoning or dry under 50～80 ℃ of conditions behind the NiTi alloy distilled water flushing in the step (three).Other step and selected parameter are identical with embodiment one.
Embodiment five: the difference of present embodiment and embodiment one is: also comprise 1～10g potassium fluozirconate in every liter of acid system working fluid of step (two).Other step and selected parameter are identical with embodiment one.
Embodiment six: the difference of present embodiment and embodiment one is: every liter of alkaline sodium silicate system working fluid is made up of the water of 4～30g water glass, 3～8g yellow soda ash, 1～5g potassium hydroxide, 2～8g sodium aluminate, 1～5mL hydrogen peroxide and surplus in the step (two).Other step and selected parameter are identical with embodiment one.
Embodiment seven: the difference of present embodiment and embodiment one is: every liter of alkaline sodium aluminate system working fluid comprises 6～20g sodium aluminate, 3～8g yellow soda ash, 1～5g potassium hydroxide and 1～5g water glass in the step (two).Other step and selected parameter are identical with embodiment one.
Embodiment eight: the difference of present embodiment and embodiment seven is: every liter of alkaline sodium aluminate system working fluid also comprises 1～5g urea and/or 10～100mL ethanol in the step (two).Other step and selected parameter are identical with embodiment seven.
Embodiment nine: the difference of present embodiment and embodiment one is: every liter of alkaline sodium phosphate system working fluid is made up of the water of 5～35g sodium phosphate, 2～5g sodium aluminate, 1～5mL hydrogen peroxide, 1～5g water glass, 1～10g titanium dioxide and surplus in the step (two).Other step and selected parameter are identical with embodiment one.
Embodiment ten: the difference of present embodiment and embodiment one is: be that 220～580V, negative pulse voltage are that 10～290V, positive negative pulse stuffing operating frequency are to handle 10～55min under the condition of 50～2900Hz at bidirectional pulse power supply, positive pulse voltage in the step (two).Other step and selected parameter are identical with embodiment one.
Embodiment 11: the difference of present embodiment and embodiment one is: be that 250～550V, negative pulse voltage are that 50～250V, positive negative pulse stuffing operating frequency are to handle 15～50min under the condition of 100～2800Hz at bidirectional pulse power supply, positive pulse voltage in the step (two).Other step and selected parameter are identical with embodiment one.
Embodiment 12: the difference of present embodiment and embodiment one is: the Nickel-titanium alloy for medical purpose in the step () is that atomic percent nickel is 50.5%～51.5% medical NiTi shape memory alloy.Other step and selected parameter are identical with embodiment one.
Embodiment 13: present embodiment Nickel-titanium alloy for medical purpose differential arc oxidation is handled and to be carried out according to the following steps: (one) atomic percent nickel be 50.8% medical niti-shaped memorial alloy successively through deoil, SiC sand papering and ultrasonic cleaning carry out surface preparation; (2) will put into the acid system working fluid through pretreated Nickel-titanium alloy for medical purpose, with the NiTi alloy is that positive pole, stainless steel work nest are negative pole, and control working fluid temperature is 10～40 ℃, is that 200～400V, negative pulse voltage are that 0～50V, positive negative pulse stuffing operating frequency are to handle 5～30min under the condition of 60～300Hz at bidirectional pulse power supply, positive pulse voltage; (3) seasoning behind the NiTi alloy distilled water flushing 3 times promptly obtains the Nickel-titanium alloy for medical purpose that handle through differential arc oxidation on the surface; Wherein every liter of acid system working fluid described in the step (two) by 2～10mL phosphoric acid, 2～10g potassium fluozirconate, 1～10g titanium dioxide, 10～100mL ethanol and and the water of surplus form.
The arc differential oxide ceramic layer on the medical niti-shaped memorial alloy of present embodiment surface and the bonding strength of medical niti-shaped memorial alloy be greater than 30MPa, and 10
7～10
8Inferior " deformation-recovery " circulation arc differential oxide ceramic layer is not peeled off, is come off, and arc differential oxide ceramic layer thickness evenly is 5～15 μ m, and its crystalline phase is TiO
2And ZrO
2, have erosion resistance; And through the Nickel-titanium alloy for medical purpose of differential arc oxidation after testing its mechanical property do not reduce.Nickel-titanium alloy for medical purpose carries out electrochemical corrosion test in Hank ' s simulated body fluid finds, after differential arc oxidation was handled, corrosion voltage had improved 0.15V, and corrosion current is reduced to original 1/100; Nickel-titanium alloy for medical purpose and GCr15 steel ball that present embodiment is handled through differential arc oxidation reduce to 0.24 to the frictional coefficient of mill.
Embodiment 14: present embodiment Nickel-titanium alloy for medical purpose differential arc oxidation is handled and to be carried out according to the following steps: (one) atomic percent nickel be 51.2% medical niti-shaped memorial alloy successively through deoil, SiC sand papering and ultrasonic cleaning carry out surface preparation; (2) will put into the acid system working fluid through pretreated Nickel-titanium alloy for medical purpose, with the NiTi alloy is that positive pole, stainless steel work nest are negative pole, and control working fluid temperature is 10～40 ℃, is that 300～400V, negative pulse voltage are that 40～50V, positive negative pulse stuffing operating frequency are to handle 5～30min under the condition of 60Hz at bidirectional pulse power supply, positive pulse voltage; (3) under 50～80 ℃ of conditions, dry behind the NiTi alloy distilled water flushing 3 times, promptly obtain the Nickel-titanium alloy for medical purpose that handle through differential arc oxidation on the surface; Wherein every liter of acid system working fluid described in the step (two) by 2～10mL phosphoric acid, 1～10g titanium dioxide, 100mL ethanol and and the water of surplus form.
The arc differential oxide ceramic layer on the medical niti-shaped memorial alloy of present embodiment surface and the bonding strength of medical niti-shaped memorial alloy be greater than 30MPa, and 10
7～10
8Inferior " deformation-recovery " circulation arc differential oxide ceramic layer is not peeled off, is come off, and arc differential oxide ceramic layer thickness evenly is 1～15 μ m, and its principal crystalline phase is TiO
2, have erosion resistance; And through the Nickel-titanium alloy for medical purpose of differential arc oxidation after testing its mechanical property do not reduce.Nickel-titanium alloy for medical purpose carries out electrochemical corrosion test in Hank ' s simulated body fluid finds, after differential arc oxidation was handled, corrosion voltage had improved 0.17V, and corrosion current is reduced to original 1/300.
Embodiment 15: present embodiment Nickel-titanium alloy for medical purpose differential arc oxidation is handled and to be carried out according to the following steps: (one) atomic percent nickel be 50.8% medical niti-shaped memorial alloy successively through deoil, SiC sand papering and ultrasonic cleaning carry out surface preparation; (2) will put into alkaline sodium aluminate system working fluid through pretreated Nickel-titanium alloy for medical purpose, with the NiTi alloy is that positive pole, stainless steel work nest are negative pole, and control working fluid temperature is 10～40 ℃, is that 450V, negative pulse voltage are that 0～80V, positive negative pulse stuffing operating frequency are to handle 5～60min under the condition of 30～2000Hz at bidirectional pulse power supply, positive pulse voltage; (3) under 50～80 ℃ of conditions, dry behind the NiTi alloy distilled water flushing 3 times, promptly obtain the Nickel-titanium alloy for medical purpose that handle through differential arc oxidation on the surface; Wherein every liter of alkaline sodium aluminate system working fluid described in the step (two) by 6～10g sodium aluminate, 3～8g yellow soda ash, 1～5g potassium hydroxide, 2～5g urea, 1～5g water glass, 50～100mL ethanol and and the water of surplus form.
The arc differential oxide ceramic layer on the medical niti-shaped memorial alloy of present embodiment surface and the bonding strength of medical niti-shaped memorial alloy be greater than 30MPa, and 10
7～10
8Inferior " deformation-recovery " circulation arc differential oxide ceramic layer is not peeled off, is come off, and arc differential oxide ceramic layer thickness evenly is 1～20 μ m, and its principal crystalline phase is an aluminium titanates, has erosion resistance; And through the Nickel-titanium alloy for medical purpose of differential arc oxidation after testing its mechanical property do not reduce.Nickel-titanium alloy for medical purpose carries out electrochemical corrosion test in Hank ' s simulated body fluid finds, after differential arc oxidation was handled, corrosion voltage had improved 0.1V, and corrosion current is reduced to original 1/500.
Embodiment 16: present embodiment Nickel-titanium alloy for medical purpose differential arc oxidation is handled and to be carried out according to the following steps: (one) atomic percent nickel be 51% medical niti-shaped memorial alloy successively through deoil, SiC sand papering and ultrasonic cleaning carry out surface preparation; (2) will put into alkaline sodium aluminate system working fluid through pretreated Nickel-titanium alloy for medical purpose, with the NiTi alloy is that positive pole, stainless steel work nest are negative pole, and control working fluid temperature is 10～40 ℃, is that 450V, negative pulse voltage are that 0～80V, positive negative pulse stuffing operating frequency are to handle 5～60min under the condition of 30～2000Hz at bidirectional pulse power supply, positive pulse voltage; (3) seasoning behind the NiTi alloy distilled water flushing 3 times promptly obtains the Nickel-titanium alloy for medical purpose that handle through differential arc oxidation on the surface; Wherein every liter of alkaline sodium aluminate system working fluid described in the step (two) by 10～20g sodium aluminate, 3～8g yellow soda ash, 1～5g potassium hydroxide, 2～5g urea, 1～5g water glass, 100mL ethanol and and the water of surplus form.
The arc differential oxide ceramic layer on the medical niti-shaped memorial alloy of present embodiment surface and the bonding strength of medical niti-shaped memorial alloy be greater than 30MPa, and 10
7～10
8Inferior " deformation-recovery " circulation arc differential oxide ceramic layer is not peeled off, is come off, and arc differential oxide ceramic layer thickness evenly is 1～20 μ m, and its principal crystalline phase is an aluminum oxide, has erosion resistance; And through the Nickel-titanium alloy for medical purpose of differential arc oxidation after testing its mechanical property do not reduce.Nickel-titanium alloy for medical purpose carries out electrochemical corrosion test in Hank ' s simulated body fluid finds, after differential arc oxidation was handled, corrosion voltage had improved 0.12V, and corrosion current is reduced to original 1/200; Nickel-titanium alloy for medical purpose and GCr15 steel ball that present embodiment is handled through differential arc oxidation reduce to 0.21 to the frictional coefficient of mill.
Embodiment 17: present embodiment Nickel-titanium alloy for medical purpose differential arc oxidation is handled and to be carried out according to the following steps: (one) atomic percent nickel be 50.8% medical niti-shaped memorial alloy successively through deoil, SiC sand papering and ultrasonic cleaning carry out surface preparation; (2) will put into alkaline sodium silicate system working fluid through pretreated Nickel-titanium alloy for medical purpose, with the NiTi alloy is that positive pole, stainless steel work nest are negative pole, and control working fluid temperature is 10～40 ℃, is that 250～600V, negative pulse voltage are that 0～80V, positive negative pulse stuffing operating frequency are to handle 5～60min under the condition of 100～3000Hz at bidirectional pulse power supply, positive pulse voltage; (3) under 50～80 ℃ of conditions, dry behind the NiTi alloy distilled water flushing 3 times, promptly obtain the Nickel-titanium alloy for medical purpose that handle through differential arc oxidation on the surface; Wherein every liter of alkaline sodium silicate system working fluid described in the step (two) by 4～30g water glass, 3～8g yellow soda ash, 1～5g potassium hydroxide, 2～8g sodium aluminate, 1～5mL hydrogen peroxide and and the water of surplus form.
The arc differential oxide ceramic layer on the medical niti-shaped memorial alloy of present embodiment surface and the bonding strength of medical niti-shaped memorial alloy be greater than 30MPa, and 10
7～10
8Inferior " deformation-recovery " circulation arc differential oxide ceramic layer is not peeled off, is come off, and arc differential oxide ceramic layer thickness evenly is 1～20 μ m, and its principal crystalline phase is TiO
2With non-crystalline state SiO
2, have erosion resistance; And through the Nickel-titanium alloy for medical purpose of differential arc oxidation after testing its mechanical property do not reduce.Nickel-titanium alloy for medical purpose carries out electrochemical corrosion test in Hank ' s simulated body fluid finds, after differential arc oxidation was handled, corrosion voltage had improved 0.18V, and corrosion current is reduced to original 1/800.
Embodiment 18: present embodiment Nickel-titanium alloy for medical purpose differential arc oxidation is handled and to be carried out according to the following steps: (one) atomic percent nickel be 50.8% medical niti-shaped memorial alloy successively through deoil, SiC sand papering and ultrasonic cleaning carry out surface preparation; (2) will put into alkaline sodium phosphate system working fluid through pretreated Nickel-titanium alloy for medical purpose, with the NiTi alloy is that positive pole, stainless steel work nest are negative pole, and control working fluid temperature is 10～40 ℃, is that 300～600V, negative pulse voltage are that 0～100V, positive negative pulse stuffing operating frequency are to handle 5～30min under the condition of 100～3000Hz at bidirectional pulse power supply, positive pulse voltage; (3) under 50～80 ℃ of conditions, dry behind the NiTi alloy distilled water flushing 3 times, promptly obtain the Nickel-titanium alloy for medical purpose that handle through differential arc oxidation on the surface; Wherein every liter of alkaline sodium phosphate system working fluid described in the step (two) by 5～35g sodium phosphate, 2～5g sodium aluminate, 1～5mL hydrogen peroxide, 1～5g water glass, 1～10g titanium dioxide and and the water of surplus form.
The arc differential oxide ceramic layer on the medical niti-shaped memorial alloy of present embodiment surface and the bonding strength of medical niti-shaped memorial alloy be greater than 30MPa, and 10
7～10
8Inferior " deformation-recovery " circulation arc differential oxide ceramic layer is not peeled off, is come off, and arc differential oxide ceramic layer thickness evenly is 1～10 μ m, and its principal crystalline phase is TiO
2With non-crystalline state P
2O
5, have erosion resistance; And through the Nickel-titanium alloy for medical purpose of differential arc oxidation after testing its mechanical property do not reduce.Nickel-titanium alloy for medical purpose carries out electrochemical corrosion test in Hank ' s simulated body fluid finds, after differential arc oxidation was handled, corrosion voltage had improved 0.2V, and corrosion current is reduced to original 1/1000.
Claims (10)
1, the method handled of Nickel-titanium alloy for medical purpose differential arc oxidation, it is characterized in that the Nickel-titanium alloy for medical purpose differential arc oxidation is handled carries out according to the following steps: the surface preparation of (one) Nickel-titanium alloy for medical purpose; (2) will put into working fluid through pretreated Nickel-titanium alloy for medical purpose, with the NiTi alloy is that positive pole, work nest are negative pole, and control working fluid temperature is 10～40 ℃, is that 200～600V, negative pulse voltage are that 0～300V, positive negative pulse stuffing operating frequency are to handle 5～60min under the condition of 30～3000Hz at bidirectional pulse power supply, positive pulse voltage; (3) 3～4 after drying of NiTi alloy distilled water flushing promptly obtain the Nickel-titanium alloy for medical purpose that handle through differential arc oxidation on the surface; Wherein working fluid is acidity or alkaline system described in the step (two), and every liter of acid system working fluid comprises 2～10mL phosphoric acid, 1～10g titanium dioxide and 10～100mL ethanol, and the alkaline system working fluid is water glass, sodium aluminate or sodium phosphate system.
2, the method handled of Nickel-titanium alloy for medical purpose differential arc oxidation according to claim 1, it is characterized in that the surface preparation of step () Nickel-titanium alloy for medical purpose be followed successively by deoil, SiC sand papering and ultrasonic cleaning.
3, the method for Nickel-titanium alloy for medical purpose differential arc oxidation processing according to claim 1 is characterized in that work nest is made by stainless steel in the step (two).
4, the method handled of Nickel-titanium alloy for medical purpose differential arc oxidation according to claim 1 is characterized in that in the step (three) behind the NiTi alloy distilled water flushing seasoning or dries under 50～80 ℃ of conditions.
5, the method for Nickel-titanium alloy for medical purpose differential arc oxidation processing according to claim 1 is characterized in that also comprising 1～10g potassium fluozirconate in every liter of acid system working fluid of step (two).
6, the method for Nickel-titanium alloy for medical purpose differential arc oxidation processing according to claim 1 is characterized in that every liter of alkaline sodium silicate system working fluid is made up of the water of 4～30g water glass, 3～8g yellow soda ash, 1～5g potassium hydroxide, 2～8g sodium aluminate, 1～5mL hydrogen peroxide and surplus in the step (two).
7, the method for Nickel-titanium alloy for medical purpose differential arc oxidation processing according to claim 1 is characterized in that every liter of alkaline sodium aluminate system working fluid comprises 6～20g sodium aluminate, 3～8g yellow soda ash, 1～5g potassium hydroxide and 1～5g water glass in the step (two).
8, the method for Nickel-titanium alloy for medical purpose differential arc oxidation processing according to claim 7 is characterized in that every liter of alkaline sodium aluminate system working fluid also comprises 1～5g urea and/or 10～100mL ethanol in the step (two).
9, the method for Nickel-titanium alloy for medical purpose differential arc oxidation processing according to claim 1 is characterized in that every liter of alkaline sodium phosphate system working fluid is made up of the water of 5～35g sodium phosphate, 2～5g sodium aluminate, 1～5mL hydrogen peroxide, 1～5g water glass, 1～10g titanium dioxide and surplus in the step (two).
10, the method handled of Nickel-titanium alloy for medical purpose differential arc oxidation according to claim 1 is characterized in that in the step (two) at bidirectional pulse power supply, positive pulse voltage being that 220～580V, negative pulse voltage are that 10～290V, positive negative pulse stuffing operating frequency are to handle 10～55min under the condition of 50～2900Hz.
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| CN107723778A (en) * | 2017-09-06 | 2018-02-23 | 太原理工大学 | A kind of method for preparing Ni Ti O richness Ni nano-pores in NiTi alloy surfaces |
| CN107723778B (en) * | 2017-09-06 | 2020-01-07 | 太原理工大学 | Method for preparing Ni-Ti-O Ni-rich nano-pores on surface of NiTi alloy |
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| CN111334838A (en) * | 2020-04-13 | 2020-06-26 | 中国计量大学 | Preparation method of titanium alloy composite oxide film and product thereof |
| CN111334838B (en) * | 2020-04-13 | 2021-01-05 | 中国计量大学 | Preparation method of titanium alloy composite oxide film and product thereof |
| CN114948304A (en) * | 2022-06-08 | 2022-08-30 | 中航迈特粉冶科技（北京）有限公司 | Preparation process of porcelain metal, porcelain metal and porcelain tooth |
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