CN207738838U - A kind of TiAlN composite superhard coatings with the support of hardness gradient layer - Google Patents
A kind of TiAlN composite superhard coatings with the support of hardness gradient layer Download PDFInfo
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Abstract
The utility model discloses a kind of TiAlN composite superhard coatings with the support of hardness gradient layer, the superhard coating be respectively basis material from bottom to top, expand and stretch the three-decker of layer and sedimentary；Described matrix material is conductive material；It is plasma nitrocarburizing layer that layer is stretched in the expansion；The sedimentary is nitrogen aluminium titanium coating.The superhard film layers of dense TiAl N assign the sufficient abrasive resistance of base material；Plasma nitrocarburizing layer has hardness gradient, can significantly increase the support to the firmly crisp layer in surface, effectively promotes the bearing capacity of the superhard film layers of TiAlN.Also, nitrogen carbon also increases the residual-stress value on part surface layer, imparts the fatigue resistance of its bigger.Meanwhile nitride, the carbide of nitrocarburizing layer more match in thermophysical property with TiAlN film layers, film/base interface is more merged, thus film layer is made to have more secured, reliable binding force, it may have higher thermal fatigue resistance.
Description
Technical field
The utility model is related to the technical fields of composite superhard coating, having the support of hardness gradient layer more particularly to one kind
TiAlN composite superhard coatings.
Background technology
As modern technical aeronautics continue to develop, to improve engine thrust-weight ratio, operating temperature is also stepped up, at present
The compressor delivery temperature of advanced ordnance engine has reached 700 DEG C, and the operating temperature of combustion chamber and after-burner is close
2000 DEG C, turbine inlet temperature (TIT) is more than 1700 DEG C.Fig. 1 is that aero engine turbine blades operating temperature develops curve graph.However,
The performance of basis material used in the part at numbers of hot-side engine position and the temperature that can bear are limited, it is impossible to fully meet and want
It asks, the use of a variety of coatings is kind of an effective ways to improve its service life, reliability and the performances such as antifatigue.From external-to-internal
Low-temperature end is set to temperature end, each layer play respectively protection, sealing, wear-resistant, shock resistance, damping, it is heat-insulated the effects that, carry jointly
High engine operating temperature reduces fuel consumption, improves engine efficiency, extends hot-end component service life, ensures engine
Safe and reliable work.
Coating wear-resistant coating is the effective means of the wear Characteristics and Erosive Properties that improve part.In air
Dust, water droplet and the grains of sand etc. cause it to damage failure too early the erosion of fan/compressor blade under action of high-speed airflow,
Its service life can be significantly increased using hard coat protection, and the bond strength of washcoat and base material must be fully reliable,
Otherwise the abrasive wear that overburden will produce can possibly even lead to stopping accident if serious wear.
Authorization Notice No. is that the Chinese utility model patent of CN 104520472B discloses a kind of TiAlN- coated tools,
The tool have matrix and PVD process be applied to the main body single-layer or multi-layer abrasion resistant protective coating, described matrix by
Hard metal, cermet, ceramics, steel or high-speed steel are made, wherein at least one layer is wherein x in the abrasion resistant protective coating
The titanium aluminium nitrogen layer of+y=1, this layer depend on the technique used containing up to other metals of 5wt%, and described TiAlN layers is
With the alternate Ti of multiple periodicityx(A)Aly(A)N coatings (A) and Tix(B)Aly(B)The multicoat substructure of N coatings (B).The reality
It is mainly used for cutter with the coating of novel offer, makes it have high rigidity, high elastic modulus, while there are acceptable remnants to answer
The improved stability of power and cutting edge.
Authorization Notice No. is that the Chinese utility model patent of CN 103469154B discloses a kind of TiAlN laminated coatings, should
Coating is with " Ti1-xAlxN to Ti1-yAlyN to Ti1-zAlzN " is the laminated coating of a cycle.Preparation method is：Using physics
The method of vapor deposition deposits one layer of TiAl transition zone, then deposits one layer of Ti1-xAlxThe basal layer of N, then in Ti1-xAlxThe base of N
Cyclic deposition is with " Ti on bottom1-xAlxN to Ti1-yAlyN to Ti1-zAlzN " is the laminated coating in period, until composite coating
Overall thickness reaches 1 μm~10 μm, wherein 0.5≤x<y<z≤1.The laminated coating of the utility model is tightly combined with matrix, has
There are high rigidity, high intensity, particularly high oxidation resistance.
Wear phenomenon is mostly happened at material surface, therefore improves the abrasion of metal material surface using surface-coating technology
And corrosive nature, it is very effective to improving security reliability that it is used and prolonging the service life.Currently, countries in the world
Metal material is wear-resisting and the research of antifriction quality is all relatively more positive for improving, such as the U.S., Russia and China, Deng aerospaces big country, in recent years
It is reported with research to have delivered a large amount of patented technology.For aero-engine difference component since the difference of working environment needs
It wants, the technology of use mainly has：Laser melting coating, physical vapour deposition (PVD) (PVD), chemical vapor deposition (CVD), thermal spraying etc..
The current various wear-resisting type coating classifications for being successfully applied to aero-engine manufacture, function, performance requirement, system
Preparation Method and typical case component are as shown in table 1.
The wear-resisting type coating technology of 1. aero-engine of table and application component
The demand that advanced military secret promotes engine thrust-weight ratio is increasingly urgent to, and the great torque thus brought will make various
The secondary carrying condition that rubs is more harsh.The hard film layer prepared using traditional magnetron sputtering, multi sphere ion plating technology is because of it
With base material crystallographic structure, thermophysical property difference is big and is commonly present that binding force is insecure, is also easy to produce Fatigue peelback during one's term of military service
Defect.In addition, for softer base material, the bearing capacity of only a few micrometers of film layer is obviously insufficient, base material and film layer springform
Amount has larger difference, and the region contacted with film layer will generate the Light deformation of bigger, also will production under the effect of prodigious contact stress
The breakage of filming layer and contact fatigue.Currently, domestic air mail engine business men there is no and effectively solve the problems, such as this coating technology
Scheme.With quickly propelling for China's big thrust loading aero-engine manufacturing engineering, provide a kind of with sufficient bearing capacity
The support of wear-resistant, anti-friction coating technology of preparing have become extremely urgent demand.
Utility model content
For the antifriction of parts with frication pair under the conditions of heavy duty, high speed operation in aero-engine of new generation and marine diesel
The demand that polishing machine is urgently promoted is wiped, electro beam physics vapour deposition technology (EB-PVD) is organically combined and plasma carbon nitrogen is total
Technology (PNC) is oozed, a kind of TiAlN composite superhard coatings with the support of hardness gradient layer are provided, tradition PVD ganoine thin films are broken through
Binding force is unreliable, friction coefficient is high, heat resistance is poor and the insufficient technical bottleneck of bearing capacity.
Realize that the technical solution of the utility model aim is：A kind of TiAlN with the support of hardness gradient layer is compound
Superhard coating, the superhard coating be respectively basis material from bottom to top, expand and stretch the three-decker of layer and sedimentary；The base
Body material is conductive material；It is plasma nitrocarburizing layer that layer is stretched in the expansion；The sedimentary is nitrogen aluminium titanium coating.
Further, the hardness of the plasma nitrocarburizing layer gradually increases from bottom to top.
Further, thickness >=100 μm of the plasma nitrocarburizing layer；The thickness of the nitrogen aluminium titanium coating is 3-6 μ
m。
Further, the conductive material is ordinary carbon steel, high-strength steel, steel alloy, nickel-base alloy, titanium and titanium alloy, copper
And acid bronze alloy.
The preparation method of TiAlN composite superhard coatings with the support of hardness gradient layer, steps are as follows：
1), the plasma nitrocarburizing skill enhanced by hollow cathode effect and Field emission in conductive material upper surface
Plasma nitrocarburizing layer is prepared in art；
2) it, is prepared by ion source auxiliary electron beam physical gas phase deposition technology in the plasma nitrocarburizing layer surface
Obtain nitrogen aluminium titanium coating.
The major advantage of the utility model is compared with the existing technology：
As shown in Fig. 2, this figure shows Ti1-xAlxThe hardness of N coatings is with elasticity modulus with the variation diagram of Al content, Al
Atom can replace Ti atoms in part in TiN face-centred cubic structures to form TiAlN phases.Due to atomic radius RAl<RTi,Al, atom
TiN phase structures are caused to distort after part substitution Ti atoms, lattice constant reduces.Simultaneously with the variation of Al content in coating, coating
Phase structure and hardness also change.Ti-Al-N coatings can automatically form wear-resistant Al in outer surface in use2O3, from
And improve its service life.When the mole percent level of Al is less than 70%, TiAlN coating red hardness is more than TiN coatings.
As shown in figure 3, the addition of Al also significantly improves the high temperature oxidation resistance of coating, the anti-oxidant temperature of highest of TiN
Degree is higher than 600 DEG C, and the highest oxidation resistance temperature of TiAlN is higher than 800 DEG C.Reason is oxidation initial stage Al ions to external diffusion,
The surfaces Ti-Al-N form Al2O3Oxide layer plays the role of barrier layer to the diffusion of O.
1. in the composite anti-wear coating that substrate surface is formed, the structure of diffusion layer, nitrogen carbon diffusion layer are added with sedimentary
With hardness gradient, the support to the firmly crisp layer in surface can be significantly increased, effectively promotes the bearing capacity of the superhard film layers of TiAlN；
2. nitrogen carbon diffusion layer significantly increases the residual-stress value on part surface layer, the fatigue for imparting composite coating bigger is anti-
Power；
3. the nitride of nitrogen carbon penetration, carbide more match in thermophysical property with TiAlN film layers, film/base interface is more
Fusion, thus make film layer that there is more secured, reliable binding force, it may have higher thermal fatigue resistance；
4. assisting ion source and the organic results of EB-PVD are got up, the ionizing efficiency and injection for improving nitrogen ion are imitated
Rate；Simple is passed through nitrogen in vacuum cavity, can not obtain the active Nitrogen ion of sufficient amount, can not be formed superhard
AlTiN compounds；The concentration that can effectively improve Nitrogen ion by assisting ion source, in evaporation process with Al, Ti atom shape
At stable compound, while film adhesion can also be effectively improved, improve the microstructure and property of coating.
Description of the drawings
Fig. 1 is that aero engine turbine blades operating temperature develops curve graph；
Fig. 2 is Ti1-x-AlxThe hardness of N coatings, Young's modulus of elasticity with Al content change curve；
Fig. 3 is TiN and Ti-Al-N oxidation rate compares figures；
Fig. 4 is the structural schematic diagram of the TiAlN composite superhard coatings with the support of hardness gradient layer of the utility model.
1- nitrogen aluminium titanium coatings；2- plasma nitrocarburizing layers；3- conductive materials.
Specific implementation mode
With reference to specific embodiment, the utility model is furtherd elucidate, it should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model, after having read the utility model, those skilled in the art couple
It is as defined in the appended claims that the modification of the various equivalent forms of the utility model falls within the application.
Embodiment 1
As shown in figure 4, a kind of TiAlN composite superhard coatings with the support of hardness gradient layer, the superhard coating is certainly
Under to it is upper be respectively basis material, expand and stretch the three-decker of layer and sedimentary；Described matrix material is 300M high-strength steel；Described
It is plasma nitrocarburizing layer that layer is stretched in expansion；The sedimentary is nitrogen aluminium titanium coating 1.
The hardness of the plasma nitrocarburizing layer gradually increases from bottom to top.
The thickness of the plasma nitrocarburizing layer is 100 μm；The thickness of the nitrogen aluminium titanium coating is 3 μm.
The preparation method of TiAlN composite superhard coatings with the support of hardness gradient layer, steps are as follows：
1), the plasma nitrocarburizing enhanced by hollow cathode effect and Field emission in 300M high-strength steel upper surface
Plasma nitrocarburizing layer is prepared in technology；
2) it, is prepared by ion source auxiliary electron beam physical gas phase deposition technology in the plasma nitrocarburizing layer surface
Obtain nitrogen aluminium titanium coating.
According to standard ISO 14577-1 (Annex A), it is 3000HV that TiAlN composite superhard coating case hardnesses, which are made,.
Nanometer method of press-fitting combination nanometer loading of pressing in-displacement curve figure measures film/base junction of TiAlN composite superhard coatings
Resultant force is 70N.
Contact stress improves 500MPa compared with steel alloy carburizing or bearing steel.
Ball-disk frictional wear experiment measures, and under dry conditions, TiAlN composite superhard coating friction coefficient is 0.25, nothing
TiAlN film layer friction coefficient is 0.63, and friction coefficient reduces by 60% when with respect to no TiAlN film layers；TiAlN composite superhard coatings are ground
Loss rate 13%, TiN hard films wear rate 63%, TiN hard films are compared, under identical friction condition, under the wear rate of composite coating
Drop 50%.
Foundation《The inoxidizability of steel and high temperature alloy measures test method》(People's Republic of China's aircraft industry standard,
HB5258-2000 it) measures, the severe oxidation temperature of TiAlN composite superhard coatings is 800 DEG C, TiN hard films severe oxidation temperature
It it is 600 DEG C, the severe oxidation temperature compared with TiN hard films TiAlN composite superhard coatings improves 200 DEG C.
Embodiment 2
As shown in figure 4, a kind of TiAlN composite superhard coatings with the support of hardness gradient layer, the superhard coating is certainly
Under to it is upper be respectively basis material, expand and stretch the three-decker of layer and sedimentary；Described matrix material is nickel-base alloy；The expansion
It is plasma nitrocarburizing layer to stretch layer；The sedimentary is nitrogen aluminium titanium coating.
The hardness of the plasma nitrocarburizing layer gradually increases from bottom to top.
The thickness of the plasma nitrocarburizing layer is 200 μm；The thickness of the nitrogen aluminium titanium coating is 6 μm.
The preparation method of TiAlN composite superhard coatings with the support of hardness gradient layer, steps are as follows：
1), the plasma nitrocarburizing technology system enhanced by hollow cathode effect and Field emission in substrate material surface
It is standby to obtain plasma nitrocarburizing layer；
2) it, is prepared by ion source auxiliary electron beam physical gas phase deposition technology in the plasma nitrocarburizing layer surface
Obtain nitrogen aluminium titanium coating.
According to standard ISO 14577-1 (Annex A), it is 3500HV that TiAlN composite superhard coating case hardnesses, which are made,.
Nanometer method of press-fitting combination nanometer loading of pressing in-displacement curve figure measures film/base junction of TiAlN composite superhard coatings
Resultant force is 75N.
Contact stress improves 500MPa compared with steel alloy carburizing or bearing steel.
Friction and wear behavior is measured using ball-disk frictional wear experiment, under dry conditions, TiAlN composite superhard coatings
Friction coefficient is 0.20, and no TiAlN film layers friction coefficient is 0.50, and friction coefficient reduces by 60% when with respect to no TiAlN film layers；
TiAlN composite superhard coatings wear rate 15%, TiN hard films wear rate 65%, TiN hard films are compared, under identical friction condition,
The wear rate of composite coating declines 50%.
Foundation《The inoxidizability of steel and high temperature alloy measures test method》(People's Republic of China's aircraft industry standard,
HB5258-2000 it) measures, the severe oxidation temperature of TiAlN composite superhard coatings is 750 DEG C, TiN hard films severe oxidation temperature
It it is 500 DEG C, the severe oxidation temperature compared with TiN hard films TiAlN composite superhard coatings improves 250 DEG C.
The superhard film layers of dense TiAl N assign the sufficient abrasive resistance of base material；Plasma nitrocarburizing layer has hardness gradient,
The support to the firmly crisp layer in surface can be significantly increased, the bearing capacity of the superhard film layers of TiAlN is effectively promoted.Also, nitrogen carbon also increases
The big residual-stress value on part surface layer, imparts the fatigue resistance of its bigger.Meanwhile nitride, the carbonization of nitrocarburizing layer
Object more matches in thermophysical property with TiAlN film layers, and film/base interface is more merged, thus film layer is made to have more securely, reliably
Binding force, it may have higher thermal fatigue resistance.
Two specific implementation modes of the utility model are above are only, but the design concept of the utility model is not limited to
This, all non-essential modifications to the present invention made by this concept should all belong to the model for invading the utility model protection
The behavior enclosed.In every case it is the content without departing from technical solutions of the utility model, according to the technical essence of the utility model to above
Any type of simple modification, equivalent variations and remodeling, still fall within the protection of technical solutions of the utility model made by embodiment
Range.
Claims (4)
1. a kind of TiAlN composite superhard coatings with the support of hardness gradient layer, it is characterised in that：The superhard coating is under
The three-decker of layer and sedimentary is stretched to upper respectively basis material, expansion；Described matrix material is conductive material；The expansion is stretched
Layer is plasma nitrocarburizing layer；The sedimentary is nitrogen aluminium titanium coating.
2. the TiAlN composite superhard coatings according to claim 1 with the support of hardness gradient layer, it is characterised in that：Institute
The hardness for stating plasma nitrocarburizing layer gradually increases from bottom to top.
3. the TiAlN composite superhard coatings according to claim 1 with the support of hardness gradient layer, it is characterised in that：Institute
State thickness >=100 μm of plasma nitrocarburizing layer；The thickness of the nitrogen aluminium titanium coating is 3-6 μm.
4. the TiAlN composite superhard coatings according to claim 1 with the support of hardness gradient layer, it is characterised in that：Institute
It is ordinary carbon steel, high-strength steel, steel alloy, nickel-base alloy, titanium and titanium alloy, copper and acid bronze alloy to state conductive material.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109913796A (en) * | 2019-03-29 | 2019-06-21 | 长安大学 | A kind of TiAlN composite coating of titanium alloy surface and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109913796A (en) * | 2019-03-29 | 2019-06-21 | 长安大学 | A kind of TiAlN composite coating of titanium alloy surface and preparation method thereof |
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