CN205893375U - Surface treatment device of titanium alloy intermittent type formula low pressure vacuum carbon nitrogen composite cementation - Google Patents
Surface treatment device of titanium alloy intermittent type formula low pressure vacuum carbon nitrogen composite cementation Download PDFInfo
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- CN205893375U CN205893375U CN201620845017.1U CN201620845017U CN205893375U CN 205893375 U CN205893375 U CN 205893375U CN 201620845017 U CN201620845017 U CN 201620845017U CN 205893375 U CN205893375 U CN 205893375U
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Abstract
The utility model discloses a surface treatment device of titanium alloy intermittent type formula low pressure vacuum carbon nitrogen composite cementation, the device is including parallelly connected high -purity nitrogen gas jar (1), high -purity argon gas jar (2) and high -purity acetylene cylinder (3), three gas tank passes through one pipe connection gaseous buffer tank (11), and gaseous buffer tank (11) are connected with vacuum tube heating furnace (5) through the pipeline, and vacuum tube heating furnace (5) are connected with vacuum system (4), be equipped with two -layer quartz glass board (6) in vacuum tube heating furnace (5) to it has thermal -insulated asbestos fibre (7) to fill between passageway (8) and quartz glass board (6). The utility model discloses a this kind of device can combine gas carburizing and gas nitriding, carries out earlier gas carburizing, and the active nitrogen atom that the crazing line that produces at work piece or specimen surface like this or gap can make the later stage further expands and oozes. Remedy not enough that independent gaseous carbonization brought.
Description
Technical field
This utility model is related to a kind of surface processing device of titanium alloy batch (-type) low-voltage vacuum compound carbonitriding, belongs to titanium
Alloy surface modifying technical field.
Background technology
Titanium alloy has the advantages that high specific strength, good corrosion resistance, high temperature resistant and good biocompatibility, extensively
It is applied to the fields such as machinery, the energy, petrochemical industry, Aero-Space and biological engineering.But titanium alloy surface hardness is not high, wearability
And fatigue performance is poor, the shortcomings of easily there is adhesive wear with the metal material of gas, thus its range receives pole
Big restriction.
In all of alloying element, nitrogen affects maximum on the hardness of titanium, and the nitride of titanium has very high hardness, excellent
Chemical stability, low coefficient of friction, excellent bio-compatibility and the advantages of good electric conductivity, in titanium alloy surface preparation
The nitride modified layer of titanium is to improve its case hardness, improves its wearability, extends its service life, expand its range
Effective measures.At present, magnetron sputtering, glow discharge nitriding, laser gas nitriding and gas nitriding process are mainly adopted in titanium alloy table
The nitride modified layer of titanium is prepared in face.Magnetron sputtering technique can form certain thickness tin film layer, improves hardness, improves wear-resisting
Property, but process through magnetron sputtering method and there is sharp interface between film layer and matrix, poor bonding strength, coating is thin, many performance indications
Less desirable.Glow discharge nitriding can significantly improve case hardness and the wearability of titanium alloy, but glow discharge nitriding can not be multiple to shape
Miscellaneous part is processed, and relatively costly.The tissue that laser nitriding is formed is thinner, and nitriding layer is tightly combined with matrix, but high
The energy quick heating of density laser bundle and the chilling action of matrix, make to produce great thermal stress in cladding layer, easily produce and split
Stricture of vagina.Meanwhile, under conditions of laser rapid solidification, when the gas in molten bath has little time to escape, pore, laser treatment are easily formed
Crackle and pore always hinder the difficult point of this technology application, also less use in actual production.Gas nitriding is simple,
With low cost, nitride hard phase can be formed in titanium alloy surface, significantly improve anti-wear performance and corrosive nature.But titanium alloy
With the increase of nitridation film thickness, nitrogen and titanium have very strong affinity, and fine and close nitration case will hinder for conventional gas nitriding
The going deep into of nitrogen, titanium alloy easily aoxidizes simultaneously, fine and close oxide-film also by hinder nitrogen to internal diffusion, therefore existing gas oozes
Nitrogen technology has the shortcomings of nitriding velocity is slow, infiltration layer is thin, infiltration layer is crisp and process time is long.So existing titanium alloy surface
Gas nitriding technology or not ideal enough it is impossible to meet use needs.
Titanium alloy, after Carburization Treatment, can obtain uniform carburized layer, is obtained in that deeper carburized (case) depth and relatively
High hardness.But carburizing temperature is higher under normal circumstances, part is susceptible to deform, and in atmosphere, active atoms of carbon concentration is relatively simultaneously
Height, absorption is in surface of the work, and the prolongation with carburizing time, higher the closer to surface of the work concentration of carbon, carbon deposition phenomenon,
Not only have impact on carburizing speed, it is uneven to also result in carbon content distribution in depth of penetration, can only extend carburizing diffusion time or carry
High carburizing temperature, its result is that carbide often after workpiece quenching and martensite level is overproof, the carbon profile of acquisition
Undesirable, the serviceability of impact workpiece.Think that the carbon black being deposited on piece surface stops the infiltration of active atoms of carbon, hinder
The carrying out of carburizing process, makes infiltration layer uneven.The carbon black being attached on retort wall reduces its heat conductivity, reduces service life of equipment
Deng.
At present, all there is certain defect, to titanium alloy in the process for modifying surface of the single nitriding of titanium alloy or carburizing
Ideal not enough can be improved it is impossible to meet the needs using.Nitriding and the respective advantage of carburizing are combined, adds in tin
Enter c and will form ti (n, c) compound, when each atom reaches suitable stoichiometric proportion, can get extreme hardness, high temperature resistant
With wear-resistant all good ti (c, n) compound, research and develop titanium alloy surface carbon nitrogen MULTILAYER COMPOSITE gradient modified layer and there is depth
Remote realistic meaning and vast potential for future development.
Utility model content
The purpose of this utility model is to overcome the defect that the simple nitriding of traditional titanium alloy or carburizing exist, and carries
For one kind simple and convenient, steady quality, low cost, short-period titanium alloy surface intensifying device.
This utility model is to be achieved through the following technical solutions:
A kind of surface processing device of titanium alloy batch (-type) low-voltage vacuum compound carbonitriding, this device includes the high-purity of parallel connection
Nitrogen pot, high-purity argon gas tank and high purity acetylene tank；Three gas tank connect a gas buffer tank, gas buffer tank by pipeline
It is connected with electron tubes type heating furnace by pipeline, electron tubes type heating furnace is connected with vacuum system；Described electron tubes type heating furnace
Inside it is provided with two-layer quartz glass plate, and between passage and quartz glass plate, be filled with heat-insulated asbestos fibre.
Further, it is provided with an air relief valve and an effusion meter between gas buffer tank and electron tubes type heating furnace.
Device gas buffer and air relief valve control gas pressure and flow mainly for accurate, medium are carried out add in composite cementation simultaneously
Control the mixing ratio of gas before heat.And vacuum system is made up of molecule pump assembly and vacuum pump.
In addition, being all separately installed with the pipeline of the gas outlet of high-purity argon gas cylinder, High Purity Nitrogen gas cylinder and high purity acetylene
Pressure gauge, and high-purity argon gas cylinder outlet port equipped with argon gas control valve door, going out in high pure nitrogen and high purity acetylene bottle
QI KOU end, equipped with gas gas control valve, is provided with vacuum gauge and aerofluxuss control on the discharge duct connecting vacuum pump and reactor
Valve processed.There is sealing ring at compound carbonitriding retort two ends.Molecule pump assembly is connected with circulating water pipe.
This utility model has following technical effect that
First, it is different from the nitridation of traditional titanium alloy simple gas carbonization gentle body, simple gas carbonization, ooze
Carbon stages period is longer, and in atmosphere, active atoms of carbon concentration is higher, and absorption is in surface of the work, and the prolongation with carburizing time,
Higher the closer to surface of the work concentration of carbon, produce carbon deposition phenomenon, and crackle easily occurs and carburizing is uneven；The gas of titanium alloy conventional
With the increase of nitridation film thickness, nitrogen and titanium have very strong affinity, and fine and close nitration case will hinder going deep into of nitrogen for body nitriding,
Titanium alloy easily aoxidizes simultaneously, fine and close oxide-film also by hinder nitrogen to internal diffusion, therefore existing gas nitriding technology is deposited
Nitriding velocity slow, infiltration layer is thin, infiltration layer is crisp and process time is long the shortcomings of.This device of the present utility model, can be by
Gas carburizing and gas nitriding combine, advanced row gas carburizing, the micro-crack so producing in workpiece or specimen surface or
Gap can make the activated nitrogen atom in later stage expand further to ooze.Make up the deficiency that independent gas carbonization brings, so in titanium alloy
The nitride for titanium of Surface Creation, the carbide of titanium and the carbonitride of titanium, are more beneficial for improving its surface property.
Secondly, this device of this utility model is repeatedly inflated using the clearance-type cycle and is evacuated, and has the advantage that low pressure
Lower carbon/nitrogen has higher carbon/nitrogen gesture, can produce more active atomic, and the cycle, batch (-type) led to/pumping repeatedly.On the one hand, stove
Pressure when being in low pressure, discharged by force by the atmosphere of slit and in the hole, adds live gass during inflation by force again, gas exchange up to
To any position communicating with furnace gas.On the other hand, the cycle exchanges furnace gas, is broken rapidly in the remained gas thin layer of surface of the work
Bad, new atmosphere produces new active atomic, accelerates the collision in surface of the work for the active atomic, makes infiltration element in surface of the work
Adsorption rate and reaction rate effectively improve.
Again, the medium of this utility model composite cementation is high purity acetylene gas or high purity acetylene+high-purity argon gas, high pure nitrogen
Or high pure nitrogen+high-purity argon gas.Pure during gas carburizing is to produce a large amount of white carbon blacks and produce hydrogen embrittlement, traditional gas in maximum problem
Body carburizing is easily to cause hydrogen embrittlement with the gas containing hydrogen such as methane, acetylene for/carbon source.In order to improve titanium alloy surface further
And hydrogen embrittlement can be avoided, carry out carburizing using acetylene gas in titanium alloy surface, acetylene is the few carbon containing of hydrogen content in alkanes gas
Measure high gas, and be diluted reducing the generation of white carbon black with argon.
Brief description
Fig. 1 is apparatus structure schematic diagram of the present utility model；
Being labeled as in accompanying drawing 1: 1- High Purity Nitrogen gas tank, 2- high-purity argon gas tank, 3- high purity acetylene tank, 4- vacuum system, 5-
Electron tubes type heating furnace, 6- quartz glass plate, the heat-insulated asbestos fibre of 7-, 8- passage, 9- effusion meter, 10- air relief valve, 11- gas
Buffer tank.
Specific embodiment
With reference to the accompanying drawings and examples this utility model is further described.
As shown in figure 1, a kind of surface processing device of titanium alloy compound carbonitriding of this utility model use is by High Purity Nitrogen
Gas tank 1, high-purity argon gas tank 2, high purity acetylene tank 3, gas buffer tank 11, air relief valve 10, electron tubes type heating furnace 5 and vacuum system
4 compositions；High Purity Nitrogen gas tank 1, high-purity argon gas tank 2, high purity acetylene tank 3 pass through rustless steel pipeline respectively with gas buffer 11 even
Connect, the other end of gas buffer 11 connects air relief valve 10, reconnects effusion meter 9, and effusion meter 9 reconnects electron tubes type heating furnace
5, the tail end of electron tubes type heating furnace 5 connects vacuum system 4 and carries out evacuation process.It is provided with two in electron tubes type heating furnace 5
Layer is filled with heat-insulated asbestos fibre 7 between quartz glass plate 6, and passage 8 and quartz glass plate 6.
It is presented herein below using several specific embodiments of the present utility model:
Embodiment 1: acetylene+nitrogen:
Tc4 titanium alloy sample is carried out ooze front pretreatment (arrangement, cleaning and activation of sample etc.), by through pretreatment
Sample load reactor tank in, retort is sealed, hunt leak and air-discharging after pass through vacuum system 4 evacuation, by reactor
Reactor is heated by the electron tubes type heating furnace 5 in tank.
Its carbon nitrogen composite cementation concrete operations is: titanium alloy sample enters the argon in stokehold high-purity argon gas tank 2
(0.1mpa) it is carried out with aerofluxuss twice, first time aerofluxuss are used for hunting leak and discharging the gas in vacum reaction tank, arrange for second
Gas is used for ensureing that the air gas in pyroreaction kettle has been drained off totally, preventing workpiece from aoxidizing.Start evacuation after aerofluxuss and incite somebody to action
Furnace temperature is raised to 900 DEG C of insulation 1h and is de-gassed and purifies, and the valve being then shut off vacuum pump stops evacuation and opens charge valve
Door is filled with high purity acetylene gas (0.01mpa) from high purity acetylene tank 3, insulation 30min followed by evacuation insulation 30min, then leads to
Cross high pure nitrogen tank 1 be filled with high pure nitrogen (0.01mpa) insulation 30min after again row evacuation insulation 30min, be so repeated
After compound carbonitriding nitrogen process 8h is taken out/inflated to intermittent cycle, the high pure nitrogen pressure medium continuing in holding reactor tank is
0.01mpa, and the greenhouse cooling in reactor tank to less than 200 DEG C is taken out afterwards titanium alloy sample and carry out coherent detection, complete
Whole compound carbonitriding operation.
Embodiment 2: nitrogen+(acetylene+argon):
Tc4 titanium alloy sample is carried out ooze front pretreatment (arrangement of sample, cleaning and activation processing etc.), will locate through pre-
The sample of reason loads in reactor tank, and reactor tank is sealed, hunts leak, passing through vacuum system 4 evacuation after aerofluxuss, by anti-
Answer the electron tubes type heating furnace 5 in device tank that retort is heated.
Its carbon nitrogen composite cementation concrete operations is: vacuum response kettle enters the argon in stokehold high-purity argon gas tank 2
(0.1mpa) it is carried out with aerofluxuss twice, first time aerofluxuss are used for hunting leak and discharging air in retort, and second exhaust main will
Ensure the air gas emptying in pyroreaction tank, prevent workpiece from aoxidizing.Start evacuation after aerofluxuss and furnace temperature is raised to 900
DEG C insulation 1h be de-gassed and purify, be then shut off vacuum pump valve stop evacuation and open charging valve pass through High Purity Nitrogen
Gas tank 1 is filled with high pure nitrogen gas (0.01mpa), insulation 30min followed by evacuation insulation 30min, then from high purity acetylene tank 3
Inflation high purity acetylene (0.01mpa) insulation 30min after again row evacuation insulation 30min, be so repeated intermittent cycle take out/
After inflation compound carbonitriding nitrogen processes 8h, continue to keep the high purity acetylene pressure medium in reactor tank to be 0.01mpa, and will be anti-
Answer the greenhouse cooling to less than 200 DEG C in device tank to take out titanium alloy sample afterwards and carry out coherent detection, complete whole compound carbonitriding
Operation.
Embodiment 3:(acetylene+argon)+(nitrogen+argon):
Tc4 titanium alloy sample is carried out ooze front pretreatment (arrangement, cleaning and activation of sample etc.), by through pretreatment
Sample load reactor tank in, retort is sealed, hunt leak and aerofluxuss after pass through vacuum system 4 evacuation, by reactor tank
In electron tubes type heating furnace 5 retort is heated.
Its carbon nitrogen composite cementation concrete operations is: titanium alloy sample enters the argon in stokehold high-purity argon gas tank 2
(0.1mpa) it is carried out with aerofluxuss twice, first time aerofluxuss are used for hunting leak and discharging the gas in vacum reaction tank, arrange for second
Gas is used for ensureing that the air gas in pyroreaction kettle has been drained off totally, preventing workpiece from aoxidizing.Start evacuation after aerofluxuss and incite somebody to action
Furnace temperature is raised to 900 DEG C of insulation 1h and is de-gassed and purifies, and the valve being then shut off vacuum pump stops evacuation and opens charge valve
Door is filled with high purity acetylene gas and high-purity argon (high purity acetylene+high-purity argon gas for 1:1 in molar ratio；Pressure is
0.01mpa), insulation 30min followed by evacuation insulation 30min, reinflated high pure nitrogen and high-purity argon gas (in molar ratio for 1:
1 high pure nitrogen+high-purity argon gas；Pressure be 0.01mpa) insulation 30min after again row evacuation insulation 30min, so repeatedly enter
After compound carbonitriding nitrogen process 8h is taken out/inflated to row intermittent cycle, continue to keep the high pure nitrogen in reactor tank and high-purity argon
Gas medium (high pure nitrogen+high-purity argon gas for 1:1 in molar ratio), pressure is 0.01mpa, and greenhouse cooling is to after less than 200 DEG C
Take out titanium alloy sample and carry out coherent detection, complete whole compound carbonitriding operation.
Certainly, above simply concrete application example of the present utility model, this utility model also has other embodiments, all
The technical scheme being formed using equivalent or equivalent transformation, is all fallen within the protection domain required by this utility model.
Claims (3)
1. a kind of surface processing device of titanium alloy batch (-type) low-voltage vacuum compound carbonitriding it is characterised in that: this device includes
The High Purity Nitrogen gas tank (1) of parallel connection, high-purity argon gas tank (2) and high purity acetylene tank (3)；Three gas tank connect a gas by pipeline
Body buffer tank (11), gas buffer tank (11) is connected with electron tubes type heating furnace (5) by pipeline, electron tubes type heating furnace (5)
It is connected with vacuum system (4)；Be provided with two-layer quartz glass plate (6) in described electron tubes type heating furnace (5), and passage (8) with
It is filled with heat-insulated asbestos fibre (7) between quartz glass plate (6).
2. the surface processing device of titanium alloy batch (-type) low-voltage vacuum compound carbonitriding according to claim 1, its feature
It is: be provided with an air relief valve (10) and an effusion meter between gas buffer tank (11) and electron tubes type heating furnace (5)
(9).
3. the surface processing device of titanium alloy batch (-type) low-voltage vacuum compound carbonitriding according to claim 1, its feature
It is: described vacuum system (4) is made up of molecule pump assembly and vacuum pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620845017.1U CN205893375U (en) | 2016-08-05 | 2016-08-05 | Surface treatment device of titanium alloy intermittent type formula low pressure vacuum carbon nitrogen composite cementation |
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| CN201620845017.1U CN205893375U (en) | 2016-08-05 | 2016-08-05 | Surface treatment device of titanium alloy intermittent type formula low pressure vacuum carbon nitrogen composite cementation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109852923A (en) * | 2019-04-11 | 2019-06-07 | 华能国际电力股份有限公司 | The preparation facilities and method of a kind of boiler header and tube socket inner wall antioxidant coating |
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2016
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109852923A (en) * | 2019-04-11 | 2019-06-07 | 华能国际电力股份有限公司 | The preparation facilities and method of a kind of boiler header and tube socket inner wall antioxidant coating |
| CN109852923B (en) * | 2019-04-11 | 2023-09-19 | 华能国际电力股份有限公司 | Device and method for preparing antioxidant coating on inner wall of boiler header and tube seat |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170118 Termination date: 20180805 |
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| CF01 | Termination of patent right due to non-payment of annual fee |