CN104087789B - Self-lubricating abrasion-resistant composite coating for titanium alloy surface and preparation method thereof - Google Patents
Self-lubricating abrasion-resistant composite coating for titanium alloy surface and preparation method thereof Download PDFInfo
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Abstract
The application provides a kind of self-lubricating abrasion-resistant composite coating for titanium alloy surface and preparation method thereof, the method is coated on titanium alloy surface after hybrid alloys powder and binding agent being mixed, formation overlays coating, and described hybrid alloys powder includes: 59wt%～62wt% nickel；18.5wt%～21wt% chromium；5wt%～8wt% boron；6.5wt%～10wt% silicon；With 3wt%～7wt% hexagonal boron nitride；Use and overlay coating described in laser beam irradiation, obtain described self-lubricating abrasion-resistant composite coating.Described hybrid alloys powder includes the nickel of above-mentioned content, chromium, boron and silicon, can play the wear-resistant effect of excellence；And it includes appropriate h BN, coating self and the fretting wear with mating plate thereof can be alleviated, significantly improve the high-temperature wearable life-span of titanium alloy.The application uses laser melting and coating technique, makes the tiny densification of coating structure and is firmly combined with titanium alloy substrate, significantly improving the comprehensive mechanical property of titanium alloy.
Description
Technical field
The application relates to titanium alloy technical field, particularly relates to a kind of self-lubricating for titanium alloy surface resistance to
Mill composite coating and preparation method thereof.
Background technology
Titanium alloy has that density is low, specific strength is high, yield tensile ratio is high, corrosion resistance excellent and good biocompatibility
Deng outstanding advantages, and compared with aluminium alloy, its mechanical behavior under high temperature is excellent, therefore, Aero-Space,
The fields such as boats and ships, weapons, ocean, oil, chemical industry and biomedical engineering are widely applied.
But, titanium alloy there is also coefficient of friction greatly, easily adhere, be difficult to lubrication, wear no resistance and high temperature antioxygen
Changing the shortcomings such as poor performance, this is applied to scope and has limited, and the most seriously restricts
Titanium alloy is as high temperature friction secondary motion parts, for example as turbo blade and the row of aero-engine
The use of air valve etc..
Owing to abrasion originates from the surface of material or parts, then, use suitable Surface Engineering means,
Preparing high rigidity and the good coating of wearability to improve its wear problem at titanium alloy surface, this has undoubtedly
Higher economy and feasibility, be possible not only to widen its application and environment, as nuclear energy, military project and
The field such as metallurgical, or at a high speed, the environment such as high temperature and heavy duty, and material or zero can be effectively improved
The service life of part, the most cost-effective and environmental conservation.At present, the coating of most of titanium alloy surfaces
As NiCrBSi alloy coat can improve its hardness and anti-wear performance.
But, traditional composite coating material is the single hardness improving titanium alloy surface and wearability
Can, and do not play antifriction (or being referred to as compatible, the self-lubricating that rubs) effect, and in a lot of situations
Under exacerbate the abrasion of mating plate, this still has adverse influence to the application of titanium alloy.
Summary of the invention
In view of this, the application provide a kind of self-lubricating abrasion-resistant composite coating for titanium alloy surface and
Preparation method, the self-lubricating abrasion-resistant composite coating that the application provides can improve the high-temperature wearable of titanium alloy surface
And antifriction performance, it is beneficial to widen its range of application.
The application provides a kind of self-lubricating abrasion-resistant composite coating for titanium alloy surface, by hybrid alloys powder
End prepares through laser melting coating at titanium alloy surface, and described hybrid alloys powder includes:
The nickel of 59wt%～62wt%；
The chromium of 18.5wt%～21wt%；
The boron of 5wt%～8wt%；
The silicon of 6.5wt%～10wt%；With
The hexagonal boron nitride of 3wt%～7wt%.
Preferably, described hybrid alloys powder includes the nickel of 60wt%.
Preferably, described hybrid alloys powder includes the hexagonal boron nitride of 4wt%～6wt%.
Preferably, the granularity of described hexagonal boron nitride is 0.2 μm～1.5 μm.
Preferably, described titanium alloy surface is Ti6Al4V titanium alloy surface.
The application provides the preparation method of a kind of self-lubricating abrasion-resistant composite coating for titanium alloy surface, bag
Include following steps:
It is coated on titanium alloy surface after hybrid alloys powder and binding agent being mixed, is formed and overlay coating, institute
State hybrid alloys powder to include:
The nickel of 59wt%～62wt%；
The chromium of 18.5wt%～21wt%；
The boron of 5wt%～8wt%；
The silicon of 6.5wt%～10wt%；With
The hexagonal boron nitride of 3wt%～7wt%；
Use and overlay coating described in laser beam irradiation, obtain the self-lubricating abrasion-resistant for titanium alloy surface and be combined
Coating.
Preferably, the power of described laser beam is 1200W～1500W；The scanning speed of described laser beam is
2mm/s～6mm/s；The size of described laser beam is 4mm (length) × 3mm (wide).
Preferably, described binding agent is methylcellulose.
Compared with prior art, the self-lubricating abrasion-resistant composite coating that the application provides is used for titanium alloy surface,
It is prepared by laser melting coating by hybrid alloys powder, and described hybrid alloys powder includes: 59wt%～62wt%
Nickel；The chromium of 18.5wt%～21wt%；The boron of 5wt%～8wt%；The silicon of 6.5wt%～10wt%；With
The hexagonal boron nitride of 3wt%～7wt%.In this application, described hybrid alloys powder includes above-mentioned specific contain
Nickel, chromium, boron and the silicon of amount, has the highest intensity, hardness and fusing point and fabulous heat stability, can
As the enhancing phase of abrasion-resistant coating material, play the wear-resistant effect of excellence；Further, described hybrid alloys powder
End includes the hexagonal boron nitride of 3wt%～7wt%, and appropriate hexagonal boron nitride can be as described wear-resistant coating material
The lubrication phase of material, effectively alleviates coating self and the fretting wear with mating plate thereof, thus significantly carries
The high-temperature wearable life-span of titanium master alloy.It addition, compare the noble metals such as silver, hexagonal boron nitride low price,
Cost performance is high.
Present invention also provides the preparation side of a kind of self-lubricating abrasion-resistant composite coating for titanium alloy surface
Method, it uses laser melting and coating technique, is made for by above-mentioned hybrid alloys powder from moistening on titanium alloy surface
Sliding wear-resisting composite coating.In this application, metal laser melting and coating technique has energy input density height, adds
The outstanding features such as hot and cold but speed is fast, and dilution rate is low and thermal deformation is little, it is possible to obtain fine microstructures is fine and close,
And be the coating material that strong metallurgical is combined with titanium alloy substrate, thus significantly improve combining of titanium alloy material
Close mechanical property.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is the electromicroscopic photograph of hexagonal boron nitride powder；
The electromicroscopic photograph of the Ni60-5%h-BN hybrid alloys powder that Fig. 2 provides for the embodiment of the present application 5；
Fig. 3 is the embodiment of the present application 5, comparative example 1 provide coating and the microhardness of titanium alloy-based surface
Curve；
Fig. 4 is the embodiment of the present application 5, comparative example 1 provide coating and titanium alloy-based surface in different temperatures
Under coefficient of friction；
Fig. 5 is the embodiment of the present application 5, comparative example 1 provide coating and titanium alloy-based surface in different temperatures
Under wear rate；
Fig. 6 is the electromicroscopic photograph of titanium alloy-based surface after abrasion；
Electromicroscopic photograph after the coating abrasion that Fig. 7 provides for the embodiment of the present application 5.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out
Clearly and completely describe, it is clear that described embodiment is only some embodiments of the present application, and
It is not all, of embodiment.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of the application protection.
This application provides a kind of self-lubricating abrasion-resistant composite coating for titanium alloy surface, by hybrid alloys
Powder prepares through laser melting coating at titanium alloy surface, and described hybrid alloys powder includes:
The nickel of 59wt%～62wt%；
The chromium of 18.5wt%～21wt%；
The boron of 5wt%～8wt%；
The silicon of 6.5wt%～10wt%；With
The hexagonal boron nitride of 3wt%～7wt%.
For the shortcoming overcoming traditional composite coating material to exist, this application provides a kind of titanium alloy surface
Self-lubricating abrasion-resistant composite coating material, it is intended to improve the high-temperature wearable antifriction performance of titanium alloy surface, thus
Widen the application scope of titanium alloy such as Ti6Al4V etc., the service life of elongated component, be beneficial to joint
About cost and protection environment.
The self-lubricating abrasion-resistant composite coating that the application provides for titanium alloy surface, its by include nickel, chromium,
The hybrid alloys powder of boron, silicon and hexagonal boron nitride, at titanium alloy surface, utilizes laser cladding method to prepare.
The alloy material that described titanium alloy is well known to those skilled in the art, the application preferably closes at Ti6Al4V titanium
Gold surface applies described self-lubricating abrasion-resistant composite coating.
In this application, the hybrid alloys powder preparing described self-lubricating abrasion-resistant composite coating includes
The nickel (Ni) of 59wt%～62wt%, preferably includes the nickel of 60wt%.The granularity of described nickel is preferably 15 μ
M～45 μm, more preferably 20 μm～40 μm.
Described hybrid alloys powder includes the chromium (Cr) of 18.5wt%～21wt%, preferably includes
The chromium of 19wt%～20wt%.The granularity of described chromium is preferably 15 μm～45 μm, more preferably 20 μm～40
μm。
Described hybrid alloys powder includes the boron (B) of 5wt%～8wt%, preferably includes 6wt%'s～7wt%
Boron, more preferably includes the boron of 6.5wt%.The granularity of described boron is preferably 15 μm～45 μm, more preferably
20 μm～40 μm.
Described hybrid alloys powder includes the silicon (Si) of 6.5wt%～10wt%, preferably includes 8wt%～9wt%
Silicon, more preferably include the silicon of 8.5wt%.The granularity of described silicon is preferably 15 μm～45 μm, more preferably
It is 20 μm～40 μm.
In addition to these elements above-mentioned, described hybrid alloys powder the most also includes impurity element, as C,
One or more in the elements such as Fe and Co.In an embodiment of the application, described hybrid alloys
Powder includes Ni60 alloy powder.
In this application, described hybrid alloys powder includes the nickel of above-mentioned certain content, chromium, boron and silicon,
There is the highest intensity, hardness and fusing point and fabulous heat stability, can be as the increasing of abrasion-resistant coating material
Qiang Xiang, plays the wear-resistant effect of excellence.
Further, described hybrid alloys powder includes the hexagonal boron nitride (h-BN) of 3wt%～7wt%, preferably
Including the hexagonal boron nitride of 4wt%～6wt%, more preferably include the hexagonal boron nitride of 5%.Described six side's nitrogen
The granularity changing boron is preferably 0.2 μm～1.5 μm, more preferably 0.5 μm～1.2 μm.In the application one
In individual embodiment, described hybrid alloys powder include the nickel of 60wt%, the chromium of 20wt%, the boron of 6.5wt%,
The silicon of 8.5wt% and the hexagonal boron nitride of 5wt%, effect is preferable.
Hexagonal boron nitride is commonly called as white graphite, and density is 2.27g/cm3, it is a kind of high performance inorganic ceramic powder
End, its powder morphology can be found in the electromicroscopic photograph that Fig. 1, Fig. 1 are hexagonal boron nitride powder.Hexagonal boron nitride
Having layer structure, its crystal is hexagonal crystal system, owing to its Van der Waals force between layers is less, cuts
Shear force is less, and therefore hexagonal boron nitride has relatively low coefficient of friction, can play good antifriction function.
Meanwhile, hexagonal boron nitride also has the features, especially high temperature such as good chemical stability and high thermal conductivity
Lubricity is good, high temperature resistant 2000 DEG C of energy.
The application adds appropriate hexagonal boron nitride in described hybrid alloys powder, and it can be as described resistance to
The lubrication phase of mill coating material, alleviates coating self and the fretting wear with mating plate thereof effectively, thus
Increase substantially the high-temperature wearable life-span of titanium alloy.It addition, hexagonal boron nitride compares the noble metal prices such as silver
Cheaply, cost performance is high.
The source of described hybrid alloys powder is not particularly limited by the application, preferably divides according to above-mentioned quality
Number, mixes nickel, chromium, boron, silicon and hexagonal boron nitride mechanical attrition method, then dries, mixed
Close alloy powder.
Herein described self-lubricating abrasion-resistant composite coating, with above-mentioned hybrid alloys powder as raw material, uses laser
The method of cladding prepares.In this application, metal laser melting and coating technique has energy input density height, adds
The outstanding features such as hot and cold but speed is fast, and dilution rate is low and thermal deformation is little, it is possible to obtain fine microstructures is fine and close,
And be the coating material that strong metallurgical is combined with titanium alloy substrate, thus significantly improve combining of titanium alloy material
Close mechanical property.
Accordingly, this application provides the system of a kind of self-lubricating abrasion-resistant composite coating for titanium alloy surface
Preparation Method, comprises the following steps:
It is coated on titanium alloy surface after hybrid alloys powder and binding agent being mixed, is formed and overlay coating, institute
State hybrid alloys powder to include:
The nickel of 59wt%～62wt%；
The chromium of 18.5wt%～21wt%；
The boron of 5wt%～8wt%；
The silicon of 6.5wt%～10wt%；With
The hexagonal boron nitride of 3wt%～7wt%；
Use and overlay coating described in laser beam irradiation, obtain the self-lubricating abrasion-resistant for titanium alloy surface and be combined
Coating.
The application utilizes laser melting and coating technique, adds hexagonal boron nitride (h-BN), prepare a kind of from
Room temperature is to the self-lubricating abrasion-resistant composite coating in the broad temperature range of 600 DEG C with good self-lubricating property
Material, by it in surface applications such as titanium alloy such as Ti6Al4V, can improve the high-temperature wearable of titanium alloy surface
Antifriction performance, thus widen its application scope, the service life of elongated component, it is beneficial to save into
Basis and environmental protection.
First the embodiment of the present application with binding agent, mixes with hybrid alloys powder, reconciles into pasty mixture；
Then it is coated at titanium alloy surface, and dries, formed and overlay coating；Described hybrid alloys powder packets
Include: the nickel of 59wt%～62wt%；The chromium of 18.5wt%～21wt%；The boron of 5wt%～8wt%；
The silicon of 6.5wt%～10wt%；Hexagonal boron nitride with 3wt%～7wt%.
In this application, the component content of described hybrid alloys powder is consistent with component content mentioned above,
Do not repeat them here.The source of described hybrid alloys powder is not particularly limited by the application, preferably according to
Above-mentioned mass fraction, mixes nickel, chromium, boron, silicon and hexagonal boron nitride mechanical attrition method, then dries
Dry, obtain hybrid alloys powder.
In this application, the effect of described binding agent is, described hybrid alloys powder is bonded in titanium and closes
Gold surface.The kind of described binding agent is not particularly limited by the application, preferably methylcellulose.This
The application matrix surface with titanium alloy surface as coating, it is preferably Ti6Al4V titanium alloy surface.
Binding agent is preferably dissolved in organic solvent by the application, obtains binder solution, described organic solvent
Include but not limited to ether solvent and alcohols solvent, preferably ether.Then, the embodiment of the present application is to institute
Stating and add described hybrid alloys powder in binder solution, stirring reconciles into pasty state, is coated with at titanium alloy surface
Cover, obtain after drying overlaying coating.The application is the most special to the consumption of described binding agent and organic solvent
Limit, pasty state can be reconciled into.The method of described coating is not particularly limited by the application, uses this
Blade coating mode known to skilled person.The method of described drying is not particularly limited by the application,
Use method well known to those skilled in the art.
After obtaining overlaying coating, the application uses and overlays coating described in laser beam irradiation, obtains closing for titanium
The self-lubricating abrasion-resistant composite coating of gold surface.
In this application, the power of described laser beam is preferably 1.2kW～1.5kW；The length of described laser beam
Degree is preferably 3mm～8mm, more preferably 4mm～6mm；The width of described laser beam is preferably
1mm～5mm, more preferably 2mm～3mm；In an embodiment of the application, described laser beam
Size or size are 4mm (length) × 3mm (wide).
The scanning speed of described laser beam is preferably 2mm/s～6mm/s, more preferably 3mm/s～5mm/s；
In an embodiment of the application, laser generator is Germany's DLS-980.10-3000C semiconductor laser
Device.In this application, single track laser scanning or multiple tracks can be used according to size needed for coating
The mode of overlap joint laser scanning carries out irradiation.
After obtaining self-lubricating abrasion-resistant composite coating, the application uses MH-5 microhardness testers, to described painting
The microhardness of layer is tested, and test condition is: loaded load is 200g, and the testing time is 15s.This
Application respectively 20 DEG C, 300 DEG C, under the conditions of 600 DEG C, described coating is rubbed, polishing machine is surveyed
Examination, wherein, wear test parameter is respectively as follows:
Load: 500g；
Wearing-in period: 30min；
Abrasion radius: 1.5mm；
Abrasion linear velocity: 13.56mm/min；
To mill part: silicon nitride ceramic ball, radius is 2mm, and hardness is 16GPa.
Experimental result shows, with titanium alloy surface, be not added with hexagonal boron nitride wear-resistant coating compared with, this
The coefficient of friction of the self-lubricating abrasion-resistant composite coating that application provides is little, and wear rate is low.
To sum up, the application uses laser melting coating, adds appropriate hexagonal boron nitride, and prepared self-lubricating is resistance to
Mill composite coating has the properties of antifriction and wear resistance of excellence in the range of room temperature to 600 DEG C.By to titanium alloy
Matrix carries out the surface modification of described self-lubricating abrasion-resistant composite coating, can be effectively improved titanium alloy substrate and exist
Tribological property under high temperature, thus extend the service life of titanium alloy kinematic pair parts, and can widen
Titanium alloy is as the application under high-temperature service environment of the kinematic pair parts.
In order to further illustrate the application, below in conjunction with embodiment the application is provided for titanium alloy table
The self-lubricating abrasion-resistant composite coating in face and preparation method thereof is described in detail, but can not they be understood
For the restriction to the application protection domain.
In following example, generating laser is Germany's DLS-980.10-3000C semiconductor laser.
Embodiment 1
By 60wt% granularity be 15 μm～the nickel of 45 μm, 20wt% granularity be 15 μm～the chromium of 45 μm,
6.5wt% granularity be 15 μm～the boron of 45 μm, 8.5wt% granularity be 15 μm～the silicon of 45 μm and 5wt%
Granularity be 0.2 μm～the hexagonal boron nitride of 1.5 μm, use after mechanical attrition method mixes and dry, obtain
Hybrid alloys powder；
Methylcellulose is dissolved in ether, adds described hybrid alloys powder and reconcile into pasty state,
Ti6Al4V titanium alloy surface coats, and obtains overlaying coating after drying；
Overlay coating described in the laser beam flying irradiation using power to be 1.2kW, obtain for titanium alloy surface
Self-lubricating abrasion-resistant composite coating；Wherein, the size of described laser beam is long 4mm, wide 3mm, scanning
Speed is 2mm/s.
Embodiment 2
By 60wt% granularity be 15 μm～the nickel of 45 μm, 20wt% granularity be 15 μm～the chromium of 45 μm,
6.5wt% granularity be 15 μm～the boron of 45 μm, 8.5wt% granularity be 15 μm～the silicon of 45 μm and 5wt%
Granularity be 0.2 μm～the hexagonal boron nitride of 1.5 μm, use after mechanical attrition method mixes and dry, obtain
Hybrid alloys powder；
Methylcellulose is dissolved in ether, adds described hybrid alloys powder and reconcile into pasty state,
Ti6Al4V titanium alloy surface coats, and obtains overlaying coating after drying；
Overlay coating described in the laser beam flying irradiation using power to be 1.2kW, obtain for titanium alloy surface
Self-lubricating abrasion-resistant composite coating；Wherein, the size of described laser beam is long 4mm, wide 3mm, scanning
Speed is 3mm/s.
Embodiment 3
By 60wt% granularity be 15 μm～the nickel of 45 μm, 20wt% granularity be 15 μm～the chromium of 45 μm,
6.5wt% granularity be 15 μm～the boron of 45 μm, 8.5wt% granularity be 15 μm～the silicon of 45 μm and 5wt%
Granularity be 0.2 μm～the hexagonal boron nitride of 1.5 μm, use after mechanical attrition method mixes and dry, obtain
Hybrid alloys powder；
Methylcellulose is dissolved in ether, adds described hybrid alloys powder and reconcile into pasty state,
Ti6Al4V titanium alloy surface coats, and obtains overlaying coating after drying；
Overlay coating described in the laser beam flying irradiation using power to be 1.5kW, obtain for titanium alloy surface
Self-lubricating abrasion-resistant composite coating；Wherein, the size of described laser beam is long 4mm, wide 3mm, scanning
Speed is 5mm/s.
Embodiment 4
By 60wt% granularity be 15 μm～the nickel of 45 μm, 20wt% granularity be 15 μm～the chromium of 45 μm,
6.5wt% granularity be 15 μm～the boron of 45 μm, 8.5wt% granularity be 15 μm～the silicon of 45 μm and 5wt%
Granularity be 0.2 μm～the hexagonal boron nitride of 1.5 μm, use after mechanical attrition method mixes and dry, obtain
Hybrid alloys powder；
Methylcellulose is dissolved in ether, adds described hybrid alloys powder and reconcile into pasty state,
Ti6Al4V titanium alloy surface coats, and obtains overlaying coating after drying；
Overlay coating described in the laser beam flying irradiation using power to be 1.5kW, obtain for titanium alloy surface
Self-lubricating abrasion-resistant composite coating；Wherein, the size of described laser beam is long 4mm, wide 3mm, scanning
Speed is 6mm/s.
Embodiment 5
It is 0.2 μ by the granularity of Ni60 alloy powder that 95wt% granularity is 15 μm～45 μm and 5wt%
M～the hexagonal boron nitride of 1.5 μm, after using mechanical attrition method to mix and dry, obtain hybrid alloys powder,
I.e. Ni60-5%h-BN hybrid alloys powder, its pattern is as in figure 2 it is shown, Fig. 2 provides for the embodiment of the present application 5
The electromicroscopic photograph of Ni60-5%h-BN hybrid alloys powder.Described Ni60 alloy powder is studied by Beijing mining and metallurgy
Total institute metal material institute provides, and wherein, the mass fraction of each composition is: C0.9%, B3.3%,
Si4.5%, Cr16%, Fe≤8.0, Ni remaining.
Methylcellulose is dissolved in ether, adds described hybrid alloys powder and reconcile into pasty state,
Ti6Al4V titanium alloy surface coats, and obtains overlaying coating after drying；
Overlay coating described in the laser beam flying irradiation using power to be 1.4kW, obtain for titanium alloy surface
Self-lubricating abrasion-resistant composite coating (referred to as Ni60-5%h-BN coating)；Wherein, the size of described laser beam
For long 4mm, wide 3mm, scanning speed is 4mm/s.
Method as described above, surveys the microhardness of described coating and titanium alloy-based surface
Examination.Result see Fig. 3, Fig. 3 be the embodiment of the present application 5, comparative example 1 provide coating and titanium alloy substrate
The microhardness curve on surface.
Method as described above, rubs to described coating and titanium alloy-based surface, abrasiveness
Can test.Result see Fig. 4 and Fig. 5, Fig. 4 be the embodiment of the present application 5, comparative example 1 provide coating and titanium
Alloy substrate surface coefficient of friction at different temperatures, Fig. 5 is the embodiment of the present application 5, comparative example 1 provides
Coating and titanium alloy-based surface wear rate at different temperatures.
After the wear testing of 600 DEG C, the present embodiment uses scanning electron microscope, observes described coating and titanium alloy-based
The wear morphology of surface.It is the Electronic Speculum of titanium alloy-based surface after abrasion that result sees Fig. 6 and Fig. 7, Fig. 6
Photo, the electromicroscopic photograph after the coating abrasion that Fig. 7 provides for the embodiment of the present application 5.
As seen from Figure 6, titanium alloy wear surface has ditch dug with a plow and a small amount of abrasive dust, according to the EDS result of abrasive dust
Analyze, containing oxygen element in abrasive dust, illustrate when 600 DEG C, the abrasion mechanism of titanium alloy be abrasive wear with
Oxidative wear.From fig.7, it can be seen that the wear surface relatively light of Ni60-5%h-BN coating abrasion surface ratio titanium alloy
Sliding, there are some abrasive dusts and a small amount of shallower pit at its wear surface, according to the EDS interpretation of result of abrasive dust,
Containing oxygen element in abrasive dust, illustrating when 600 DEG C, the abrasion mechanism of Ni60-5%h-BN coating is oxidation mill
Damage and adhesive wear.
Comparative example 1
Methylcellulose is dissolved in ether, adds the Ni60 alloy powder that granularity is 15 μm～45 μm
(source, composition same as in Example 5), reconciles into pasty state, coats at Ti6Al4V titanium alloy surface,
Obtain after drying overlaying coating；
Overlay coating described in the laser beam flying irradiation using power to be 1.4kW, obtain for titanium alloy surface
Wear-resistant coating (referred to as Ni60 coating)；Wherein, the size of described laser beam is long 4mm, wide 3mm,
Scanning speed is 4mm/s.
Method as described above, tests the microhardness of described coating, and result sees Fig. 3.
From the figure 3, it may be seen that Ti6Al4V titanium alloy surface, Ni60 coating and Ni60-5%h-BN coating is the most micro-
Hardness is respectively 360HV0.2、1005.23HV0.2And 1013.75HV0.2, the microhardness of two coatings is about
It is 3 times of titanium alloy substrate, shows that the two coating is respectively provided with preferable anti-wear performance, Ni60-5%h-BN
The average microhardness of coating is slightly higher.
Method as described above, described coating is rubbed, polishing machine test, result sees
Fig. 4 and Fig. 5.From Fig. 4 it is apparent that under 20 DEG C, 300 DEG C and 600 DEG C, Ti6Al4V titanium alloy
The coefficient of friction on surface is respectively 0.301,0.265 and 0.222；The coefficient of friction of Ni60 coating is respectively
0.283,0.254 and 0.21；The coefficient of friction of Ni60-5%h-BN coating is respectively 0.244,0.177 and 0.148.
Result shows, Ni60 coating does not changes significantly with the coefficient of friction of titanium alloy surface, and therefore Ni60 is coated with
Layer does not has antifriction function.The coefficient of friction of Ni60-5%h-BN coating significantly reduces than titanium alloy surface, therefore
Ni60-5%h-BN coating shows the antifriction function of excellence in the range of room temperature to 600 DEG C.
From fig. 5, it can be seen that at 20 DEG C, 300 DEG C and 600 DEG C, the abrasion of Ti6Al4V titanium alloy surface
Rate is respectively 42.3mm3/N.m、17.2mm3/ N.m and 9.8mm3/N.m；The wear rate of Ni60 coating divides
Wei 2.52mm3/N.m、3.15mm3/ N.m and 6.54mm3/N.m；The abrasion of Ni60-5%h-BN coating
Rate is respectively 1.13mm3/N.m、1.19mm3/ N.m and 2.25mm3/N.m.Result shows, two kinds of coatings
Wear rate be below titanium alloy surface；Wherein, the Ni60-5%h-BN coating mill when room temperature to 600 DEG C
Loss rate is below the wear rate of Ni60 coating, and the self-lubricating effect of Ni60-5%h-BN coating is special when room temperature
The most obvious.Therefore, Ni60-5%h-BN coating all has significantly in the broad range of room temperature to 600 DEG C
Properties of antifriction and wear resistance.
Comparative example 2
By Ni60 alloy powder (source, composition and embodiment 5 that 85wt% granularity is 15 μm～45 μm
Identical) and the granularity of 15wt% be 0.2 μm～the hexagonal boron nitride of 1.5 μm, use mechanical attrition method mixing
And after drying, obtain hybrid alloys powder.
Methylcellulose is dissolved in ether, adds described hybrid alloys powder and reconcile into pasty state,
Ti6Al4V titanium alloy surface coats, and obtains overlaying coating after drying；
Overlay coating described in the laser beam flying irradiation using power to be 1.4kW, splash during laser melting coating strict
Evil, is formed without the coating that can analyze；Wherein, the size of described laser beam is long 4mm, wide 3mm,
Scanning speed is 4mm/s.
Comparative example 3
By Ni60 alloy powder (source, composition and embodiment 5 that 98wt% granularity is 15 μm～45 μm
Identical) and the granularity of 2wt% be 0.2 μm～the hexagonal boron nitride of 1.5 μm, use mechanical attrition method mixing
And after drying, obtain hybrid alloys powder.
Methylcellulose is dissolved in ether, adds described hybrid alloys powder and reconcile into pasty state,
Ti6Al4V titanium alloy surface coats, and obtains overlaying coating after drying；
Overlay coating described in the laser beam flying irradiation using power to be 1.4kW, obtain for titanium alloy surface
Coating (referred to as Ni60-2%h-BN coating)；Wherein, the size of described laser beam is long 4mm, width
3mm, scanning speed is 4mm/s.
Method as described above, microhardness and friction and wear behavior to described coating are tested.
Result shows, Ni60-2%h-BN coating and the average microhardness of Ni60 coating, coefficient of friction and wear rate
Result be not clearly distinguished from.
From comparative example 2 and 3, add too much hexagonal boron nitride, it is impossible to form laser cladding coating；
Add very few hexagonal boron nitride, advantageous effect will not be played.This is because h-BN and titanium alloy substrate
Wettability is poor, and angle of wetting is big, severity of splashing when addition is many, it is impossible to enter coating, the most then cannot rise
To its due effect.
As seen from the above embodiment, the self-lubricating abrasion-resistant composite coating that the application provides is used for titanium alloy surface,
It is prepared by laser melting coating by hybrid alloys powder, and described hybrid alloys powder includes: 59wt%～62wt%
Nickel；The chromium of 18.5wt%～21wt%；The boron of 5wt%～8wt%；The silicon of 6.5wt%～10wt%；With
The hexagonal boron nitride of 3wt%～7wt%.The application adds appropriate hexagonal boron nitride, can be as described wear-resisting
The lubrication phase of coating material, alleviates coating self and the fretting wear with mating plate thereof effectively, thus greatly
Amplitude improves the high-temperature wearable life-span of titanium alloy.It addition, compare the noble metals such as silver, hexagonal boron nitride price
Cheaply, cost performance is high.
Further, the application uses laser melting and coating technique, by above-mentioned hybrid alloys powder on titanium alloy surface
It is made for self-lubricating abrasion-resistant composite coating.The preparation method that the application provides can obtain fine microstructures fine and close,
And be the coating material that strong metallurgical is combined with titanium alloy substrate, thus significantly improve combining of titanium alloy material
Close mechanical property.Meanwhile, the preparation method that the application provides is simple and easy to operate, is suitable to promote.
Claims (8)
1. for a self-lubricating abrasion-resistant composite coating for titanium alloy surface, hybrid alloys powder exist
Titanium alloy surface prepares through laser melting coating, and described hybrid alloys powder includes:
The nickel of 59wt%～62wt%；The granularity of described nickel is 20 μm～40 μm；
The chromium of 18.5wt%～21wt%；The granularity of described chromium is 20 μm～40 μm；
The boron of 5wt%～8wt%；The granularity of described boron is 20 μm～40 μm；
The silicon of 6.5wt%～10wt%；The granularity of described silicon is 20 μm～40 μm；With 3wt%～7wt%
Hexagonal boron nitride.
Self-lubricating abrasion-resistant composite coating the most according to claim 1, it is characterised in that described
Hybrid alloys powder includes the nickel of 60wt%.
Self-lubricating abrasion-resistant composite coating the most according to claim 1, it is characterised in that described
Hybrid alloys powder includes the hexagonal boron nitride of 4wt%～6wt%.
Self-lubricating abrasion-resistant composite coating the most according to claim 1, it is characterised in that described
The granularity of hexagonal boron nitride is 0.2 μm～1.5 μm.
Self-lubricating abrasion-resistant composite coating the most according to claim 1, it is characterised in that described
Titanium alloy surface is Ti6Al4V titanium alloy surface.
6. the self-lubricating abrasion-resistant composite coating being used for titanium alloy surface as claimed in claim 1
Preparation method, comprise the following steps:
It is coated on titanium alloy surface after hybrid alloys powder and binding agent being mixed, is formed and overlay coating,
Described hybrid alloys powder includes:
The nickel of 59wt%～62wt%；
The chromium of 18.5wt%～21wt%；
The boron of 5wt%～8wt%；
The silicon of 6.5wt%～10wt%；With
The hexagonal boron nitride of 3wt%～7wt%；
Use and overlay coating described in laser beam irradiation, obtain the self-lubricating abrasion-resistant for titanium alloy surface
Composite coating.
Preparation method the most according to claim 6, it is characterised in that the merit of described laser beam
Rate is 1200W～1500W；The scanning speed of described laser beam is 2mm/s～6mm/s；Described laser
The size of bundle is 4mm (length) × 3mm (wide).
Preparation method the most according to claim 6, it is characterised in that described binding agent is first
Base cellulose.
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