CN109371355A - A method of color at the control titanium alloy bearing insert class part angle of cut - Google Patents
A method of color at the control titanium alloy bearing insert class part angle of cut Download PDFInfo
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- CN109371355A CN109371355A CN201811396267.1A CN201811396267A CN109371355A CN 109371355 A CN109371355 A CN 109371355A CN 201811396267 A CN201811396267 A CN 201811396267A CN 109371355 A CN109371355 A CN 109371355A
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- titanium alloy
- bearing insert
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- angle
- class part
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention belongs to titanium alloy component ion Plasma Nitriding Treatment technologies, and in particular to a kind of process for controlling color at the titanium alloy bearing insert class part angle of cut.The present invention is at a temperature of keeping 0.3~1.5L/min ammonia flow and titanium alloy bearing insert class part ion nitriding technology, inert gas is suitably poured into ion nitriding furnace, ionic nitriding furnace inner gas pressure is set to increase to 400~700Pa, and by adjusting ion nitriding furnace pulse-width controlled glow current, the aura thickness degree at the angle of cut is controlled.The stage control that the method that the present invention controls color at the titanium alloy bearing insert class part angle of cut passes through pressure and pulsewidth to glow discharge in ion nitriding furnace, effectively optimization ionic nitriding parameter, reduce aura thickness degree at the angle of cut, reduce the technological temperature at the angle of cut, so that the surface at the angle of cut is yellowish-brown, therefore deformation is small at the angle of cut, and part geometry precision meets technique requirement.
Description
Technical field
The invention belongs to titanium alloy component ion Plasma Nitriding Treatment technologies, and in particular to a kind of control titanium alloy bearing insert class
The process of color at the part angle of cut.
Background technique
Titanium alloy bearing insert class part is during ionic nitriding, because of the wall and corner effect of glow discharge, in bearing insert
Temperature superimposition is generated because aura layer is overlapped at the angle of cut of bottom, and temperature is excessively high, causes the color at the bushing angle of cut that purple sieve is presented
It is blue, rather than it is golden yellow, it is easier that technological temperature is excessively high at the angle of cut, it is deformed, so that size swell, influences part geometry essence
Degree.
Summary of the invention
The object of the present invention is to provide one kind to guarantee zero by color at the control titanium alloy bearing insert class part angle of cut
The method of part geometric accuracy.
Technical solution of the invention are as follows: a method of color at the control titanium alloy bearing insert class part angle of cut,
At a temperature of keeping 0.3~1.5L/min ammonia flow and titanium alloy bearing insert class part ion nitriding technology, to ion
Suitably pour inert gas in nitriding furnace, ionic nitriding furnace inner gas pressure made to increase to 400~700Pa, and by adjusting from
Sub- nitriding furnace pulse-width controlled glow current controls the aura thickness degree at the angle of cut.
It after the part is put into ion nitriding furnace, vacuumizes, vacuum degree is not more than 10Pa in furnace.
The inert gas is argon gas or nitrogen or combinations thereof.
The pulse duration range of the ion nitriding furnace technological temperature holding stage: 0.5~0.7.
The pulse duration range that the ion nitriding furnace pulsewidth increases thermophase is 0.3~0.5, ionic nitriding furnace inner gas pressure
For 300~400Pa.
The titanium alloy bearing insert class part ion nitriding technology temperature is 800~950 DEG C.
The volume ratio of ammonia is not less than 6:1 in the ion nitriding furnace.
The ion nitriding furnace is additionally provided with auxiliary resistance heating system other than Heated by Glow Discharge system.
The adding thermal resistance of the auxiliary resistance heating system is located in ion nitriding furnace or its external surrounding.
The solution have the advantages that: the method that the present invention controls color at the titanium alloy bearing insert class part angle of cut passes through
The stage control of pressure and pulsewidth to glow discharge in ion nitriding furnace effectively optimizes ionic nitriding parameter, reduces the angle of cut
Locate aura thickness degree, reduces the technological temperature at the angle of cut, so that the surface at the angle of cut is yellowish-brown, therefore deformation is small at the angle of cut,
Part geometry precision meets technique requirement.
Specific embodiment
Below with reference to embodiment, the present invention will be further described:
The method that the present invention controls color at the titanium alloy bearing insert class part angle of cut is keeping 0.3~1.5L/min ammonia
At a temperature of flow and titanium alloy bearing insert class part ion nitriding technology, indifferent gas is suitably poured into ion nitriding furnace
Body makes ionic nitriding furnace inner gas pressure increase to 400~700Pa, and puts by adjusting ion nitriding furnace pulse-width controlled aura
Electric current controls the aura thickness degree at the angle of cut.
It after the part is put into ion nitriding furnace, vacuumizes, vacuum degree is not more than 10Pa in furnace, prevents residual gas in furnace
Pollution is generated to subsequent ion nitriding process.
The volume ratio of ammonia is not less than 6:1 in the ion nitriding furnace, and the inert gas is argon gas or nitrogen or its group
It closes, in the case where not influencing nitriding result, improves ionic nitriding furnace pressure.
It is adjusted when the ion nitriding furnace pulse-width adjustment using the stage, is 0.3~0.5 in the pulse duration range of temperature rise period,
In technique holding stage pulsewidth are as follows: 0.5~0.7, it can control the small glow current density of different temperatures, to control aura thickness
Degree.
Gas pressure is also that ladder increases in the ion nitriding furnace pulsewidth tune ion nitriding furnace, the liter before technological temperature
Thermophase, furnace pressure is 300~400Pa, to match with glow current and in-furnace temperature, controls heating rate in furnace.
The titanium alloy bearing insert class part ion nitriding technology temperature be 800~950 DEG C, can accelerate nitrogen-atoms to
Diffusion, Accelerate nitriding speed inside titanium alloy component.The ion nitriding furnace in order to realize that High temperature ion nitrogenizes, in addition to aura plus
Outside hot systems, also need to increase auxiliary resistance heating system.The adding thermal resistance of the auxiliary resistance heating system is located at ionic nitriding
In furnace or its external surrounding, so that ionic nitriding in-furnace temperature meets technique requirement.
Embodiment 1
By taking certain size titanium alloy bearing insert as an example, which is TA7.
1, part is put into the titanium alloy ionic nitriding special furnace with auxiliary thermal source, is evacuated to 7Pa.
2, when the part ionic nitriding, NH is selected3And N2Two kinds of mixed gas, two kinds of ratio of gas mixture are 6:1, heating
Stage furnace inner gas pressure maintains 350Pa.
3, the temperature rise period is heated to 350 DEG C and starts to start aura, break up arc, for removing titanium alloy surface passivating film, adjusts
The pulsewidth of whole ion nitriding furnace makes pulse duration range be in 0.40 ± 0.05 (pulse duration table shake).
4, it after heating reaches 900 DEG C, is kept the temperature, and increase NH3And N2The flow of mixed gas, improve furnace in air pressure extremely
550Pa, and pulse duration range is made to be promoted to 0.60 ± 0.05.
5, it in furnace after ionic nitriding heat preservation 10h, slowly reduces mixed gas in furnace and is passed through flow, be down to air pressure in furnace
350Pa, while pulse duration range is reduced to 0.40 ± 0.05, after being cooled to 350 DEG C, aura system is closed, and stop leading into furnace
Enter gas.
6, it after part cools to 200 DEG C with the furnace, comes out of the stove air-cooled.
By above-mentioned process, face of the part after 900 DEG C of ion Plasma Nitriding Treatments, at the bearing insert bottom angle of cut
Color is changed into yellowish-brown by pansy, meets the requirement of design.
Embodiment 2
By taking certain size titanium alloy bearing insert as an example, which is TA7.
1, part is put into the titanium alloy ionic nitriding special furnace with auxiliary thermal source, is evacuated to 10Pa.
2, when the part ionic nitriding, NH is selected3With two kinds of mixed gas of Ar, two kinds of ratio of gas mixture are 8:1, heating
Stage furnace inner gas pressure maintains 300Pa.
3, the temperature rise period is heated to 300 DEG C and starts to start aura, breaks up arc, remove titanium alloy surface passivating film, adjust arteries and veins
Wide scope is at 0.35 ± 0.05.
4, it after heating reaches 850 DEG C, is kept the temperature, and increase NH3With the flow of Ar mixed gas, improve furnace in air pressure extremely
600Pa, and pulse duration range is made to be promoted to 0.55 ± 0.05.
5, it in furnace after ionic nitriding heat preservation 8h, slowly reduces mixed gas in furnace and is passed through flow, be down to air pressure in furnace
300Pa, while pulse duration range is reduced to 0.35 ± 0.05, after being cooled to 300 DEG C, aura system is closed, and stop leading into furnace
Enter gas.
6, it after part cools to 200 DEG C with the furnace, comes out of the stove air-cooled.
By above-mentioned process, face of the part after 850 DEG C of ion Plasma Nitriding Treatments, at the bearing insert bottom angle of cut
Color is changed into yellowish-brown by pansy, meets the requirement of design.
Claims (9)
1. it is a kind of control the titanium alloy bearing insert class part angle of cut at color method, which is characterized in that keep 0.3~
It is appropriate into ion nitriding furnace at a temperature of 1.5L/min ammonia flow and titanium alloy bearing insert class part ion nitriding technology
Inert gas is poured, so that ionic nitriding furnace inner gas pressure is increased to 400~700Pa, and by adjusting ion nitriding furnace pulsewidth
Glow current is controlled, the aura thickness degree at the angle of cut is controlled.
2. the method for color at the control titanium alloy bearing insert class part angle of cut according to claim 1, which is characterized in that
The inert gas is argon gas or nitrogen or combinations thereof.
3. the method for color at the control titanium alloy bearing insert class part angle of cut according to claim 1, which is characterized in that
The pulse duration range of the ion nitriding furnace technological temperature holding stage: 0.5~0.7.
4. the method for color at the control titanium alloy bearing insert class part angle of cut according to claim 1, which is characterized in that
The ion nitriding furnace pulsewidth increase thermophase pulse duration range be 0.3~0.5, ionic nitriding furnace inner gas pressure be 300~
400Pa。
5. the method for color at the control titanium alloy bearing insert class part angle of cut according to claim 1, which is characterized in that
The titanium alloy bearing insert class part ion nitriding technology temperature is 800~950 DEG C.
6. the method for color at the control titanium alloy bearing insert class part angle of cut according to claim 1, which is characterized in that
The volume ratio of ammonia is not less than 6:1 in the ion nitriding furnace.
7. the method for color at the control titanium alloy bearing insert class part angle of cut according to claim 1, which is characterized in that
The ion nitriding furnace is additionally provided with auxiliary resistance heating system other than Heated by Glow Discharge system.
8. the method for color at the control titanium alloy bearing insert class part angle of cut according to claim 1, which is characterized in that
It after part is put into ion nitriding furnace, vacuumizes, vacuum degree is not more than 10Pa in furnace.
9. the method for color at the control titanium alloy bearing insert class part angle of cut according to claim 6, which is characterized in that
The adding thermal resistance of the auxiliary resistance heating system is located in ion nitriding furnace or its external surrounding.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110760788A (en) * | 2019-10-29 | 2020-02-07 | 长春奥普光电技术股份有限公司 | Modification treatment method for surface hardness of cast titanium alloy |
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2018
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CA2456520A1 (en) * | 2004-01-30 | 2005-07-30 | Hubert Patrovsky | Nitriding method for improving surface characteristics of cobalt-chromium based alloys |
CN102808146A (en) * | 2012-09-12 | 2012-12-05 | 大连理工大学 | Industrialized automatic control plasma source nitriding device and technology thereof |
CN103233219A (en) * | 2013-03-22 | 2013-08-07 | 常州大学 | Metal TiN ceramic coating preparation process method |
CN104388891A (en) * | 2014-12-05 | 2015-03-04 | 西安赛福斯材料防护有限责任公司 | Hardening method of inner surface of cylinder barrel of titanium and titanium alloy hydraulic cylinder |
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