CN109338285A - A method of Si-Co composite cementation gradient coating is formed in titanium alloy surface - Google Patents
A method of Si-Co composite cementation gradient coating is formed in titanium alloy surface Download PDFInfo
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- CN109338285A CN109338285A CN201811315234.XA CN201811315234A CN109338285A CN 109338285 A CN109338285 A CN 109338285A CN 201811315234 A CN201811315234 A CN 201811315234A CN 109338285 A CN109338285 A CN 109338285A
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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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/34—Embedding in a powder mixture, i.e. pack cementation
- C23C10/52—Embedding in a powder mixture, i.e. pack cementation more than one element being diffused in one step
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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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/02—Pretreatment of the material to be coated
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Abstract
This application discloses a kind of methods for forming Si-Co composite cementation gradient coating in titanium alloy surface, comprise the following steps that and pre-process to the surface of titanium alloy；Then the titanium alloy is immersed in penetration enhancer, is sealed, be heated to 1050~1200 DEG C, keep the temperature 2~20h, after cooling, cleaning, drying.The present invention combines diffusion co-penetration technology using surface activating process, diffusion agent formulation, titanium alloy surface prepared even tissue it is fine and close and with the compact Si-Co complex gradient coating of matrix.This method can be improved titanium alloy surface wear-resisting property and high-temperature oxidation resistance, expands its engineering application, has very important significance.
Description
Technical field
This application involves technical field of material, compound in titanium alloy surface formation Si-Co in particular to one kind
Seep the method for gradient coating.
Background technique
Titanium alloy have density is low, fusing point is higher, specific strength is high and a series of good excellent comprehensive performances of corrosion resistance,
Thus it is widely used in fields such as aerospace, energy source of car, biologic medicals.But the hardness of titanium alloy is lower and glutinous
Property it is big, wear Characteristics are very poor, thus using titanium alloy preparation connector surface easily generate thread gluing, occlusion and draw
Wound；In addition, the high-temperature oxidation resistance of titanium alloy is also undesirable, when temperature is more than 550 DEG C, Ti can in air oxygen and
Strong reaction, the TiO of generation occur for nitrogen2Or TiN reaction product layer is loose porous, protectiveness is very poor.Therefore titanium alloy
Practical Project application is greatly limited.
Preparing surface protection coating is the convenience and effective way for improving titanium alloy surface wear-resisting property and antioxygenic property,
In this regard, researcher has done many work and has achieved good progress both at home and abroad.Using magnetron sputtering, laser melting coating, ion
The kinds of processes such as injection, plasma spraying or combination process are prepared for miscellaneous protective coating system in titanium alloy surface,
Such as TiAl base coating (TiAl3,TiAl2With TiAlCr etc.), M-CrAlY (M represents Ni, Co and NiCo etc.) coating, ceramic coating
(Al2O3Coating, enamel coating and ZrO2Thermal barrier coating etc.).These coatings are in fretting wear or the high temperature antioxygen for improving titanium alloy
Change performance etc. and achieve certain effect, but in the prevalence of or shock resistance it is poor, or with matrix ining conjunction with it is weak, or significantly
The disadvantages of reducing matrix fatigue behaviour, and the rarely seen research that can take into account titanium alloy wear-resisting property and high-temperature oxidation resistance at
Fruit.For example, although carrying out Nitrizing Treatment in titanium alloy surface can be improved the hardness and wearability on its surface, but when temperature is more than
At 550 DEG C, with Ti matrix kickback will occur for N, and the brittleness of matrix is caused to increase；Using plasma spraying or magnetron sputtering side
For the coating of method preparation due to being influenced by titanium alloy substrate is active, the bond strength of coating and matrix is not high；And use laser molten
The defects of generally existing coating internal stress of coating prepared by coating process is big, underbead crack or more micro-crack.Therefore, titanium alloy
The problem further applied solves far away, needs to explore more preferably protective coating system and its technology of preparing.
In numerous coating systems, silicide coating has many advantages, such as that density is low, hardness is high, excellent wear-resisting property, together
When be capable of forming that mobility is strong, the SiO with self-healing ability under high temperature aerobic environment2Protective film, high-temperature oxidation resistance are excellent
It is good, it is consequently belonging to that ideal titanium alloy surface is wear-resisting, antioxidant defense coating.But the brittleness of single silicide coating compared with
Height is easy to produce cracking under the action of frrction load or even falls off and lose protectiveness, and preparing composite coating is to improve that its is tough
The effective means of property.Co is the important source material for producing heat-resisting alloy, hard alloy etc., can significantly improve the hardness, tough of alloy
Property and wear-resisting property, in silicide coating add Co its toughness and wear-resisting property are improved, good knot can be obtained
Fruit.In addition, preparation process also has important influence for the usage performance of coating, it can be in titanium alloy using diffusion infiltration method
The silicide coating that (metallurgical bonding) is tightly combined with gradient structure structure and with matrix alloy is prepared on surface, but by Ti and
The influence of Co alloy activity itself is difficult to prepare Si-Co composite cementation gradient coating in titanium alloy surface using diffusion infiltration method,
The technology of this aspect and application still belong to blank at present.
Summary of the invention
Aiming at the problem that in the prior art about the application of titanium alloy by limitation, the present invention provides one kind in titanium alloy
The method that surface forms Si-Co composite cementation gradient coating, can improve the surface abrasion resistance and antioxygenic property of titanium alloy, promote
Into the Practical Project application of titanium alloy.Meanwhile solving the technical problem that titanium alloy surface is difficult to realize Si-Co composite cementation.
The method provided by the present invention for forming Si-Co composite cementation gradient coating in titanium alloy surface, including following step
It is rapid:
The surface of titanium alloy is pre-processed；Then the titanium alloy is immersed in penetration enhancer, seals, is heated to 1050
~1200 DEG C, 2~20h is kept the temperature, after cooling, cleaning, drying.It is preferred that 1050~1200 DEG C of holding temperature, soaking time 4h.
Specifically, the pretreatment includes the following steps:
Titanium alloy surface is polishing to it is smooth, then in acetone soln be cleaned by ultrasonic 5~10min after dry up；It is placed in
Alkali cleaning 0.5~1 minute in NaOH solution；It is placed in pickling 0.5~1 minute in HF solution；It is placed in Cr2O3In solution at surface active
Reason 20 minutes~1 hour.Such pretreatment why is done, is made altogether to sufficiently clean and activate Ti alloy surface tissue
It is able to effectively be adsorbed in specimen surface by the active atomic of infiltration element during infiltration.Preferably, the NaOH solution concentration is
30~50g/L, HF the solution concentration 40~60g/L, the Cr2O3Solution selects saturated solution.Preferably, when alkali cleaning
Between be 0.5min, pickling time 0.5min, the activations processing time be 20~60min.
Further, the present invention also provides the formula of the penetration enhancer, component and contents are as follows:
Si powder: weight percent 5~20%；
Co powder: weight percent 5~20%；
NH4Cl powder: weight percent 2~4%；
NaF powder: weight percent 1~3%；
SiC powder: surplus.
For the present invention, optimization formula 10Si-10Co-3NH4Cl-2NaF-75SiC, i.e. component and content are as follows:
Si powder 10%, Co powder 10%, NH4Cl powder 3%, NaF powder 2%, SiC powder 75%.When using the formula, permeation effect is best, resistance to
It grinds performance and antioxygenic property is best.
The penetration enhancer obtains by the following method: weighing each component of penetration enhancer according to weight percent, mixes, then ball milling
2~4h makes penetration enhancer be sufficiently mixed refinement.The size of each component powder size, preferably≤200 mesh.
Specifically, the submergence, step are as follows: be packed into penetration enhancer in corrosion-and high-temp-resistant container, be then embedded to titanium alloy
In penetration enhancer, compacting, and penetration enhancer is covered on upper layer, upper thickness is greater than 10mm.The corrosion-and high-temp-resistant container preferably ceramic
Crucible.The preferred 12mm of thickness of the covering penetration enhancer.
Specifically, the sealing, the sealing medium used is silica solution, waterglass and Al2O3Mixture.Further,
The sealing medium, composition and ratio are as follows: 60~70 parts of silica solution, 18~22 parts of waterglass, 45~55 parts of Al2O3.It is preferred that
Waterglass about 20g, Al is added in every 50ml silica solution2O3About 50g.
Specifically, the heating, heating rate is that 6~10 DEG C/min is easy to cause close if heating rate is too fast
It seals the quick-fried lid of crucible and is easy to cause catalyst premature decomposition if heating rate is excessively slow, permeation effect is poor.The present invention is come
It says, preferably 6 DEG C/min.
Specifically, the cleaning, drying, are that titanium alloy ultrasonic cleaning in alcohol is dried after ten minutes by treated
It is dry.
Method provided by the present invention finally forms complex gradient layer, the complex gradient layer on the surface of titanium alloy
By (Ti, Co) Si2Outer layer, TiSi middle layer and Ti5Si4+Ti5Si3Internal layer is constituted.
The utility model has the advantages that the present invention combines diffusion co-penetration technology using specific surface activating process, diffusion agent formulation, closed in titanium
Gold surface prepared even tissue it is fine and close and with the compact Si-Co complex gradient coating of matrix, and realize coating
Tissue is quantitative controllable with ingredient, for improving titanium alloy surface wear-resisting property and high-temperature oxidation resistance, expands its engineering
Using having very important significance.
The present invention combines diffusion permeation using specific surface activation techniques, diffusion agent formulation (including catalyst and filler)
It is controllable can to prepare Si, Co content in titanium alloy surface for technique, even tissue it is fine and close and with the compact compound ladder of matrix
Spend coating.Simple process, low in cost and repeatable advantages such as strong are had both simultaneously, are suitable for production and application.
Detailed description of the invention
Fig. 1 is the surface topography map of titanium alloy surface Si-Co composite cementation gradient coating.
Fig. 2 is the Cross Section Morphology figure of titanium alloy surface Si-Co composite cementation gradient coating.
Fig. 3 is the distribution diagram of element of titanium alloy surface Si-Co composite cementation gradient coating.
Fig. 4 is that titanium alloy substrate, titanium alloy surface seep merely Si coating and titanium alloy surface Si-Co composite cementation gradient coating
Shape appearance figure after fretting wear.
Fig. 5 is that titanium alloy substrate, titanium alloy surface seep merely Si coating and titanium alloy surface Si-Co composite cementation gradient coating
Shape appearance figure after high-temperature oxydation.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only
The embodiment of the application a part, instead of all the embodiments.
Embodiment 1
1. sample prepares: each surface of Ti alloy sample being successively successively polishing to light using 180~No. 2000 waterproof abrasive papers
It is sliding；2. surface cleaning and activation: the sample after polishing being placed in acetone soln to cold wind after being cleaned by ultrasonic 10min and is dried up, then
Sample is sequentially placed into NaOH, HF and Cr2O3Alkali cleaning 0.5min → pickling 0.5min → surface activation process is carried out in solution
20min；3. penetration enhancer is prepared: according to each component of weight percent precise penetration enhancer, comprising: the Si powder of 200 mesh, content are
5%；The Co powder of 200 mesh, content 5%；Analyze pure (99%) NH4Cl, content 2%；Analyze pure (99%) NaF, content
1%；Remaining is the SiC powder of 200 mesh；4. abrasive material: prepared penetration enhancer being placed in ball milling 4h in planetary gear ball mill, fills it
Divide refinement mixing；5. charging: the penetration enhancer after ball milling being packed into crucible, and the sample after surface clean is activated is nuzzled penetration enhancer internal pressure
Penetration enhancer thickness about 12mm real, that specimen surface covers after compacting；6. sealing: the crucible equipped with sample being covered and sealed, is sealed
Medium is silica solution, waterglass (Na2SiO3·9H2) and Al O2O3Mixture (waterglass about 20g is added in every 50ml silica solution,
Al2O3About 50g)；It seeps: the crucible being sealed being fitted into the controllable heat-treatment furnace of high temperature, according to the heating of 6 DEG C/min 7. high temperature expands
Heat-treatment furnace is warming up to 1050 DEG C and keeps the temperature 4h by rate, with being furnace-cooled to room temperature；8. cleaning, drying: by sample by being taken in penetration enhancer
Out, ultrasonic cleaning is dried after ten minutes in alcohol, is terminated.
Embodiment 2
Preparation step and embodiment 1 are identical, and difference is the activation time of specimen surface, the Si powder in penetration enhancer, Co powder
With catalyst (NH4Cl and NaF) content and diffusion seep temperature.Specifically, 1. sample prepares: successively using 180~2000
Each surface of Ti alloy sample is successively polishing to smooth by number waterproof abrasive paper；2. surface cleaning and activation: the sample after polishing is set
Cold wind dries up after being cleaned by ultrasonic 10min in acetone soln, and sample is then sequentially placed into NaOH, HF and Cr2O3It is carried out in solution
Alkali cleaning 0.5min → pickling 0.5min → surface activation process 40min；3. penetration enhancer is prepared: being seeped according to weight percent precise
The each component of agent, comprising: the Si powder of 200 mesh, content 10%；The Co powder of 200 mesh, content 10%；Analyze pure (99%)
NH4Cl, content 3%；Analyze pure (99%) NaF, content 2%；Remaining is the SiC powder of 200 mesh；4. abrasive material: will prepare
Penetration enhancer be placed in ball milling 4h in planetary gear ball mill, so that it is sufficiently refined mixing；5. charging: the penetration enhancer after ball milling is packed into earthenware
Crucible, and the sample after surface clean is activated is nuzzled and is compacted in penetration enhancer, the penetration enhancer thickness about 12mm that specimen surface covers after compacting；
6. sealing: the crucible equipped with sample being covered and sealed, sealing medium is silica solution, waterglass (Na2SiO3·9H2) and Al O2O3
Mixture (waterglass about 20g, Al is added in every 50ml silica solution2O3About 50g)；It is seeped 7. high temperature expands: the crucible being sealed is packed into
In the controllable heat-treatment furnace of high temperature, heat-treatment furnace is warming up to 1100 DEG C according to the heating rate of 6 DEG C/min and keeps the temperature 4h, it is cold with furnace
To room temperature；8. cleaning, drying: by sample by taking out in penetration enhancer, ultrasonic cleaning is dried after ten minutes in alcohol, is terminated.
Embodiment 3
Preparation step is identical as embodiment 1 and 2, and difference is the activation time of specimen surface, the Si powder in penetration enhancer, Co
Powder and catalyst (NH4Cl and NaF) content and diffusion seep temperature.Specifically, 1. sample prepares: successively using 180~
Each surface of Ti alloy sample is successively polishing to smooth by No. 2000 waterproof abrasive papers；2. surface cleaning and activation: by the examination after polishing
Sample is placed in acetone soln cold wind drying after ultrasonic cleaning 10min, and sample is then sequentially placed into NaOH, HF and Cr2O3In solution
Carry out alkali cleaning 0.5min → pickling 0.5min → surface activation process 60min；3. penetration enhancer is prepared: accurately claiming according to weight percent
Measure each component of penetration enhancer, comprising: the Si powder of 200 mesh, content 20%；The Co powder of 200 mesh, content 20%；It analyzes pure
(99%) NH4Cl, content 4%；Analyze pure (99%) NaF, content 3%；Remaining is the SiC powder of 200 mesh；4. abrasive material: will match
The penetration enhancer made is placed in ball milling 4h in planetary gear ball mill, it is made sufficiently to refine mixing；5. charging: the penetration enhancer after ball milling is filled
Enter crucible, and the sample after surface clean is activated is nuzzled and is compacted in penetration enhancer, the penetration enhancer thickness that specimen surface covers after compacting is about
12mm；6. sealing: the crucible equipped with sample being covered and sealed, sealing medium is silica solution, waterglass (Na2SiO3·9H2O)
With Al2O3Mixture (waterglass about 20g, Al is added in every 50ml silica solution2O3About 50g)；It is seeped 7. high temperature expands: by what is be sealed
Crucible is fitted into the controllable heat-treatment furnace of high temperature, and heat-treatment furnace is warming up to 1200 DEG C according to the heating rate of 6 DEG C/min and is kept the temperature
4h, with being furnace-cooled to room temperature；8. cleaning, drying: by sample by taking out in penetration enhancer, ultrasonic cleaning is dried after ten minutes in alcohol,
Terminate.
As shown in Figure 1, by the surface topography map of the complex gradient coating obtained under Examples 1 to 3 different technology conditions, into
Row comparison.The wherein preparation condition of coating shown in Fig. 1 (a) are as follows: surface active 20min, it is 1050 DEG C that temperature is seeped in diffusion, and diffusion is seeped
Time is 4h, and impregnation agent composition is 5Si-5Co-2NH4Cl-1NaF-87SiC (wt.%)；The preparation condition of coating shown in Fig. 1 (b)
Are as follows: surface active 40min, it is 1100 DEG C that temperature is seeped in diffusion, and the diffusion infiltration time is 4h, impregnation agent composition 10Si-10Co-
3NH4Cl-2NaF-75SiC (wt.%)；The preparation condition of coating shown in Fig. 1 (c) are as follows: temperature is seeped in surface active 60min, diffusion
It is 1200 DEG C, diffusion seeps the time for 4h, and impregnation agent composition is 20Si-20Co-4NH4Cl-3NaF-53SiC (wt.%).It can see
Out, complex gradient coating tissue prepared by embodiment 2 is comparatively dense.
As shown in Fig. 2, by the coating cross sections in the complex gradient coating section obtained under Examples 1 to 3 different technology conditions
Microstructure figure, compare.The wherein preparation condition of coating shown in Fig. 2 (a) are as follows: temperature is seeped in surface active 20min, diffusion
It is 1050 DEG C, diffusion seeps the time for 4h, impregnation agent composition 5Si-5Co-2NH4Cl-1NaF-87SiC (wt.%)；Shown in Fig. 2 (b)
The preparation condition of coating are as follows: surface active 40min, it is 1100 DEG C that temperature is seeped in diffusion, and the diffusion infiltration time is 4h, and impregnation agent composition is
10Si-10Co-3NH4Cl-2NaF-75SiC (wt.%)；The preparation condition of coating shown in Fig. 2 (c) are as follows: surface active 60min,
It is 1200 DEG C that temperature is seeped in diffusion, and the diffusion infiltration time is 4h, impregnation agent composition 20Si-20Co-4NH4Cl-3NaF-53SiC
(wt.%).Coating prepared by as can be seen that has multi-layer compound structure, wherein complex gradient coating prepared by embodiment 2
Thickness is moderate, and tissue is comparatively dense, and permeation effect is preferable.
As shown in figure 3, by the Elemental redistribution in the complex gradient coating section obtained under Examples 1 to 3 different technology conditions,
It compares.The wherein preparation condition of coating shown in Fig. 3 (a) are as follows: surface active 20min, it is 1050 DEG C that temperature is seeped in diffusion, diffusion
The infiltration time is 4h, impregnation agent composition 5Si-5Co-2NH4Cl-1NaF-87SiC (wt.%)；Fig. 3 (b) is Ti in Fig. 3 (a) coating
The distribution of element, Fig. 3 (c) are the distribution of Si element in Fig. 3 (a) coating, and Fig. 3 (d) is the distribution of Co element in Fig. 3 (a) coating,
Fig. 3 (e) is the distribution of Al element in Fig. 3 (a) coating.As can be seen that according to containing in complex gradient coating prepared by embodiment
There are Ti, Si, Co and Al element, realizes the effect of Si-Co permeation.
As shown in figure 4, Ti alloy substrate, Ti alloy surface seep Si coating merely and Si-Co composite cementation gradient coating is rubbing
Pattern after scouring damage and high-temperature oxydation, Fig. 4 (a) be Ti alloy substrate sample at normal temperature with Al2O3After ball opposite grinding 60min
Grinding defect morphology, Fig. 4 (b) be it is simple seep Si coating sample at normal temperature with Al2O3Grinding defect morphology after ball opposite grinding 60min, Fig. 4 (c)
For Si-Co composite cementation gradient coating sample at normal temperature with Al2O3Grinding defect morphology after ball opposite grinding 60min；
As shown in figure 5, Fig. 5 (a) is macro morphology of the Ti alloy substrate sample after 1000 DEG C of constant temperature oxidation 100h, Fig. 5
It (b) is the simple macro morphology for seeping Si coating sample after 1000 DEG C of constant temperature oxidation 100h, Fig. 5 (c) is Si-Co composite cementation gradient
Macro morphology of the coating sample after 1000 DEG C of constant temperature oxidation 100h；The simple preparation process for seeping Si coating is surface active
40min, penetration enhancer ingredient 10Si-2NaF-88SiC (wt.%), diffusion seep 1100 DEG C of temperature, soaking time 4h, Si-Co composite cementation
The preparation process of gradient coating are as follows: surface active 40min, penetration enhancer ingredient 10Si-10Co-3NH4Cl-2NaF-75SiC
(wt.%), diffusion seeps 1100 DEG C of temperature, soaking time 4h.As can be seen that compared with Ti alloy substrate and simple infiltration Si coating,
The polishing scratch of Si-Co composite cementation gradient coating upon wear is narrower, and wear surface peels off less, and the oxidation film after oxidation is without obvious stripping
It falls, and Ti alloy substrate and the simple Si coating that seeps peel off seriously.
Properties of product test
The titanium alloy complex gradient coating that 1~embodiment of embodiment, 3 the method is obtained carries out fretting wear and high temperature
Anti-oxidant experiment.
1~comparative example of comparative example 3, it is identical as the preparation temperature of 1~embodiment of embodiment 3, time, the difference is that seeping
Co is free of in agent, being formed by coating is simple siliconizing coatings.
Comparative example 0 is not surface treated titanium alloy, carries out fretting wear and high-temperature oxidation resistant test.
Acquired results are as shown in the table:
| Room temperature wears 60min | 600 DEG C of abrasion 60min | 1000 DEG C of oxidation 100h | |
| Comparative example 0 | Wear weight loss 1.9mg | Wear weight loss 2.4mg | 17.8mg/cm2 |
| Comparative example 1 | Wear weight loss 0.9mg | Wear weight loss 1.2mg | 2.6mg/cm2 |
| Comparative example 2 | Wear weight loss 0.8mg | Wear weight loss 1.1mg | 2.4mg/cm2 |
| Comparative example 3 | Wear weight loss 0.9mg | Wear weight loss 1.2mg | 2.7mg/cm2 |
| Embodiment 1 | Wear weight loss 0.4mg | Wear weight loss 0.6mg | 1.3mg/cm2 |
| Embodiment 2 | Wear weight loss 0.3mg | Wear weight loss 0.5mg | 1.2mg/cm2 |
| Embodiment 3 | Wear weight loss 0.4mg | Wear weight loss 0.7mg | 1.5mg/cm2 |
As can be seen from the above table, the method for the application treated titanium alloy is in wear-resisting property and high-temperature oxidation resistant
Aspect of performance is significantly better than that the performance of untreated titanium alloy substrate and simple siliconizing coatings.It is real for the application
Example 2 is applied to behave oneself best in terms of wear-resisting property and high-temperature oxidation resistance.
To sum up, fretting wear is carried out to prepared complex gradient coating and high-temperature oxidation resistant is tested, the results showed that this hair
Coating provided by bright has both excellent wear-resisting property and high-temperature oxidation resistance.
Above embodiments are preferred embodiment of the present application, are not intended to limit this application.
Claims (10)
1. a kind of method for forming Si-Co composite cementation gradient coating in titanium alloy surface, which is characterized in that including following step
It is rapid:
The surface of titanium alloy is pre-processed；Then the titanium alloy is immersed in penetration enhancer, is sealed, it is heated to 1050~
1200 DEG C, 2~20h is kept the temperature, after cooling, cleaning, drying.
2. the method according to claim 1 for forming Si-Co composite cementation gradient coating in titanium alloy surface, feature exist
In the pretreatment includes the following steps:
Titanium alloy surface is polishing to it is smooth, then in acetone soln ultrasonic cleaning 5~dry up after ten minutes；It is molten to be placed in NaOH
Alkali cleaning 0.5~1 minute in liquid；It is placed in pickling 0.5~1 minute in HF solution；It is placed in Cr2O3Surface activation process 20 is divided in solution
Clock~1 hour.
3. the method according to claim 1 for forming Si-Co composite cementation gradient coating in titanium alloy surface, feature exist
In, the penetration enhancer, component and content are as follows:
Si powder: weight percent 5~20%；
Co powder: weight percent 5~20%；
NH4Cl powder: weight percent 2~4%；
NaF powder: weight percent 1~3%；
SiC powder: surplus.
4. the method according to claim 1 for forming Si-Co composite cementation gradient coating in titanium alloy surface, feature exist
In the penetration enhancer obtains by the following method: according to weight percent weigh penetration enhancer each component, mixing, then ball milling 2~
4h makes penetration enhancer be sufficiently mixed refinement.
5. the method according to claim 1 for forming Si-Co composite cementation gradient coating in titanium alloy surface, feature exist
In, the submergence, specific steps are as follows: it is packed into penetration enhancer in corrosion-and high-temp-resistant container, then titanium alloy is embedded in penetration enhancer, pressure
It is real, and penetration enhancer is covered on upper layer, upper layer penetration enhancer thickness is greater than 10mm.
6. the method according to claim 1 for forming Si-Co composite cementation gradient coating in titanium alloy surface, feature exist
In the sealing, the sealing medium used is silica solution, waterglass and Al2O3Mixture.
7. the method according to claim 1 for forming Si-Co composite cementation gradient coating in titanium alloy surface, feature exist
In, the sealing medium, composition and ratio are as follows: 60~70 parts of silica solution, 18~22 parts of waterglass, 45~55 parts of Al2O3。
8. the method according to claim 1 for forming Si-Co composite cementation gradient coating in titanium alloy surface, feature exist
In the heating, heating rate is 6~10 DEG C/min.
9. the method according to claim 1 for forming Si-Co composite cementation gradient coating in titanium alloy surface, feature exist
In, the cleaning, drying, be by alcohol ultrasonic cleaning dry after ten minutes.
10. the method according to claims 1 to 9 for forming Si-Co composite cementation gradient coating in titanium alloy surface, feature
It is, the complex gradient layer is by (Ti, Co) Si2Outer layer, TiSi middle layer and Ti5Si4+Ti5Si3Internal layer is constituted.
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Cited By (2)
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| CN110438441A (en) * | 2019-09-12 | 2019-11-12 | 西安建筑科技大学 | A kind of Si-Co-Y co-penetration layer and preparation method thereof of Ti alloy surface nanosizing auxiliary preparation |
| CN115584542A (en) * | 2022-05-26 | 2023-01-10 | 四川轻化工大学 | Method for preparing Al-Co-Ti composite coating on surface of titanium alloy |
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