CN106435445A - Preparation method of Cr-containing TiCN-based composite coating - Google Patents
Preparation method of Cr-containing TiCN-based composite coating Download PDFInfo
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- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
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Abstract
The invention discloses a preparation method of a Cr-containing TiCN-based composite coating. The method comprises the steps of step 1, carrying out roughening treatment on the surface of a matrix sample; step 2, mechanically mixing Ti/C composite powder with Cr powder to obtain original feeding composite powder; step 3, spraying Ni-Al self-fluxing alloy powder on the surface of a matrix in advance to obtain a bottom layer of which the thickness is 90 to 120 <mu>m, wherein the weight percent of Al in the Ni-Al self-fluxing alloy powder is 10 wt%; and step 4, spraying the original feeding composite powder on the surface of the bottom layer to obtain a TiCN-Cr metal-based ceramic composite coating of which the thickness is 300 to 500 <mu>m. The plasma spraying TiCN-Cr metal-based ceramic composite coating provided by the invention has relatively high hardness and good abrasion resistance and corrosion resistance, is suitable for working under abrasive and corrosive environment conditions like the fields of machinery manufacturing of cutting tools, drills and molds, automobile manufacturing and aerospace, and has quite wide application prospect.
Description
Technical field
The present invention relates to a kind of preparation method of spray-on coating, more particularly to a kind of with high rigidity and high-wearing feature etc.
Plasma spray coating and preparation method thereof.
Background technology
TiCN is a kind of ternary ultra hard ceramic material, is the solid solution of TiN and TiC.It has the high rigidity of ceramic material
(HV=2472kg/mm2) high chemical stability and wearability, good resistance to elevated temperatures, mechanical chemical industry, automobile making and
Many fields such as Aero-Space are widely used.
At present, prepare TiCN and generally adopt plasma asistance vapour deposition process (PACVD), chemical vapour deposition technique (CVD)
With surface treatment methods such as ion implantings, although these methods achieve prominent progress on TiCN coating is prepared, but by
There is deposition efficiency low (2～10 μm/h) in these methods, the thickness of film is excessively thin (10～50 μm), the combination of coating and matrix is relatively
Difference, it is difficult to the shortcomings of preparing complicated structural member (Pan Y J, Chen S H, Xin-Jie W U, et
al.Preparation and Anti-Oxidation Properties of Ti(CN)Films Deposited by P
CVD [J]. material heat treatment journal, 2004,25 (5):851-853.), it is difficult to adapt to the Service Environment etc. under heavy load abrasion,
Its intrinsic performance can not be given full play to, so as to constrain the application of TiCN.
Plasma spraying has the characteristics that process is simple, flexible, workpiece without the need for redesigning.Reaction and plasma spraying
Integrate plasma spraying and self- propagating technology, its preparation efficiency high cost is low, it is adaptable to various sizes piece surface.
The composite powder for being suitable to spray is prepared by mixing into cheap graphite or carbon powder as carbon source and micron order Ti powder, is sent into
Nitrogenous high-temperature plasma flame stream, there is Self-propagating Reaction Synthesis nanocrystalline TiCN coating (Zhu Lin, He Jining, the Yan with C, N in Ti
Hall is right, etc. plasma spraying synthesis TiCN thick coating and its friction and wear characteristic [J]. Science Bulletin, 2007,52 (8):972-
977.).As coating is single nanocrystalline coating, the nanocrystalline stress for causing in coating for being orientated complexity is higher, although applying
Layer hardness increases, but the abrasion under the conditions of top load can not still meet the requirement of service condition.
Content of the invention
The technical purpose of the present invention is the deficiency for above-mentioned plasma spraying TiCN coating, provides a kind of plasma spray
(composition of coating is changed into micro- from nano level TiCN ceramic coating to micron-nanometer level Multi-scale model TiCN-Cr prepared by painting
Rice-nanoscale Multi-scale model TiCN-Cr) ceramic on metal composite coating.The method is added in titanium carbon compound spraying powder
Cr composition, further increases the hardness of TiCN ceramic coating, overcomes the shortcoming of TiCN ceramic coating wearability deficiency, and
And significantly enhance the bond strength of TiCN ceramic coating and matrix.
The technical scheme is that：
A kind of preparation method of the TiCN base composite coating containing Cr, comprises the following steps：
Step 1, matrix specimen surface is roughened；
Step 2, Ti/C composite powder and Cr powder are passed through mechanical mixture, obtain original feeding composite granule；
Described Ti/C composite powder is that Ti powder and C powder are obtained by the method for mist projection granulating, mass ratio Ti：C=4～8：1,
Described C is graphite；The quality of Cr powder is the 10%～30% of the quality of Ti/C composite powder；
Step 3, Ni-10%wtAl self-melting alloy powder body being sprayed in advance in matrix surface, obtains thickness for 90～120 μm
Bottom；
Step 4, original feeding composite granule is added in plasma spraying equipment, then adopts reaction and plasma spraying
Method, sprays to bottom surface, obtains TiCN-Cr ceramic on metal composite coating, and the thickness of coating is 300～500 μm；
Wherein, spray parameters are set to：450～500A of operating current；55～75V of arc voltage；Argon flow amount 20～
40L/min, 0.6～0.8MPa of pressure；4～8L/min of nitrogen flow, 0.6～0.8MPa of pressure；2～5L/min of powder feeding rate；
80～120mm of spray distance；Spray angle is 90 °；Wherein nitrogen is used as powder feeding gas, and argon is used as protective gas.
The granularity of described Ni-Al powder is -150 mesh of mesh～+350, the i.e. powder diameter in 38 μm to 74 μm mesh scopes
Interior；
In described step 1 roughening processing method be sandblasting, sand papering or machining roughening.
Described matrix is metal or ceramic material.
Described metal is rustless steel, aluminium alloy, titanium alloy or copper.
The granularity of described Ti powder is -270 mesh of mesh～-300, the granularity of graphite powder be+10000 mesh, Cr powder granularity for+
270 mesh of mesh～+330.
In described Ni-Al self-melting alloy powder body, preferably the quality of Al is the 10% of powder quality.
Compared with prior art, the invention provides a kind of titanium carbon compound spraying powder containing Cr, using plasma spraying
The powder spray is formed TiCN-Cr ceramic on metal composite coating after metal or ceramic matrix surface by technology, this
Bright beneficial effect is：
(1) the titanium carbon compound spraying powder for containing Cr has good high temperature oxidation resistance, is avoided that quilt in spraying process
Over oxidation, so as to improve the compactness of coat inside structure after spraying, and the coating porosity size for obtaining after spraying is fitted
In, shape is round and smooth, so as to effectively reduce the generation of crackle；
(2) the coating principal phase that the method is prepared is TiC0.7N0.3, coated grains size between 60～100nm, coating
For micron-nanometer level Multi-scale model coating, large block amorphous phase in addition in coating, is dispersed with.Cr is in the coating mainly with Cr simple substance
In the form of, dissolve in formation Cr-Ti-N ternary phase Cr in TiCN lattice on a small quantity0.5Ti0.5N.Hard phase Cr simple substance granule conduct
Hardening constituent Dispersed precipitate is effectively improved hardness and the wearability of coating in coating.With single TiCN nanocrystalline coating
Compare, the case hardness of TiCN-Cr ceramic on metal composite coating prepared by the method is by 1674Hv0.1Increase to 1800Hv0.1,
Hardness is significantly improved；Compared with single TiCN nanocrystalline coating, measure after identical frictional experiment the wear extent of coating by
0.0028g is reduced to 0.0007g, i.e. wear extent and reduces 68% or so, and wearability is significantly improved；
(3), in the TiCN metal matrix ceramic composite coating forming process of plasma spraying, prepared by mechanical mixture and contain certain matter
On the one hand the original feeding powder body of the Cr composition of amount fraction, wherein Cr as hard phase, can strengthen the hardness of coating and wear-resisting
Property；On the other hand as the Binder Phase of composite coating, by forming certain thickness (Ti, Cr) C solid solution around hard phase
Clad structure, is conducive to strengthening caking property and the compactness of the internal structure of coating, compared with single TiCN nanocrystalline coating,
The bond strength of TiCN-Cr ceramic on metal composite coating prepared by the method increases to 28.66MPa by 25.21MPa, in conjunction with
Intensity is significantly improved；
(4) there is certain crackle and hole in coating prepared by this technique, because coating is produced during Melting And Solidification
Raw volume contraction, can produce thermal stress between layers, and under lubricating condition, the hole in coating can store lubricating oil.Cause
With the wear-out part in certain porosity, particularly lubricant environment in this coating, be conducive to improving the antiwear and antifriction of coating
Energy.
Therefore, plasma spraying TiCN-Cr ceramic on metal composite coating provided by the present invention has high hardness, good
Good wear-and corrosion-resistant performance, it is adaptable to wear and tear, workpiece under corrosion working conditions, the such as machinery such as cutting tool, drill bit, mould,
The field such as automobile making and Aero-Space, with extremely wide application prospect.
Description of the drawings
Fig. 1 is the SEM figure of 45# steel matrix surface TiCN-Cr ceramic on metal composite coating in the embodiment of the present invention 1；
Fig. 2 is the XRD spectrum of 45# steel matrix surface TiCN-Cr ceramic on metal composite coating in the embodiment of the present invention 1；
Fig. 3 is the microhardness of 45# steel matrix surface TiCN-Cr ceramic on metal composite coating in the embodiment of the present invention 1
Figure；
Fig. 4 is the bond strength of 45# steel matrix surface TiCN-Cr ceramic on metal composite coating in the embodiment of the present invention 1
Figure；
Fig. 5 is the abrasion spirogram of 45# steel matrix surface TiCN-Cr ceramic on metal composite coating in the embodiment of the present invention 1；
Specific embodiment
Embodiment is described in further detail to the present invention below in conjunction with the accompanying drawings, it should be pointed out that described below is implemented
Example is intended to be easy to the understanding of the present invention, and does not play any restriction effect to which.
The granularity of Ti powder according to the present invention is -270 mesh of mesh～-300, and the granularity of graphite powder is about+10000 mesh, Cr powder
Granularity be+270 mesh of mesh～+330.
Embodiment 1：
In the present embodiment, in 45# steel matrix specimen surface, micron-nanometer level is prepared using reaction and plasma spraying technique many
The TiCN-Cr ceramic on metal composite coating of yardstick, the coating principal phase for preparing is TiC0.7N0.3, Cr is in the coating mainly with Cr
In the form of simple substance, formation Cr-Ti-N ternary phase Cr in TiCN lattice is dissolved on a small quantity0.5Ti0.5N.
The preparation method of the coating is as follows：
(1) 45# steel matrix sample is put in TPS-1 type vapour-pressure type sandblasting machine, surface is carried out at blasted rough
Reason, abrasive particle is inhaled into nozzle, is accelerated in high pressure draught, is ejected into matrix surface, obtains clean, coarse surface, so as to
Increase the adhesion between matrix and coating；
(2) using graphite as carbon source, it is 6 according to the mass ratio of Ti, C powder：1, using mist projection granulating method prepare Ti,
C composite powder, the particle diameter of composite powder is 60～70 μm, by Ti, C composite powder for preparing, by the matter that the quality of Cr powder is composite powder
The 20% of amount, by the method for mechanical mixture, obtains the original feeding composite granule of spraying, and the wherein granularity of Ti powder is -300
Mesh, the granularity of graphite powder is+10000 mesh, and the granularity of Cr powder is+300 mesh；
(3), before spray-on coating, Ni-10%wtAl self-melting alloy powder body is sprayed in advance on steel matrix surface, obtain thickness
The bottom (or bond coating) for 100 μm is spent, the wherein granularity of Ni-10%wtAl powder is -150 mesh of mesh～+350, the i.e. powder
Last particle diameter is in the range of 38 μm to 74 μm mesh.Nickel alclad bond coating can realize the metallurgical binding on microcosmic, its purpose with matrix
It is to strengthen the bond strength between TiCN-Mo ceramic on metal composite coating and matrix；
(4) the original feeding composite granule of mechanical mixture is put in the powder feeder of GP-80 type plasma spraying equipment,
By powder feeding gas, send in the plasma flame flow of high temperature and high speed, specially：Matrix is fixed on spraying working platform, adjusts work
Make electric current 500A；Arc voltage 60V；Powder feeding rate is 4L/min, and spray gun scanning speed is 0.0064m/s, adjusts spray distance
For 100mm, spray angle is 90 °, argon flow amount 40L/min, argon pressure 0.7MPa, nitrogen flow 7L/min, nitrogen pressure
0.7MPa, starts spraying, obtains TiCN-Cr ceramic on metal composite coating, about 400 μm of the thickness of coating.
Fig. 1 is the SEM figure of TiCN-Cr ceramic on metal composite coating obtained above.As can be seen that the tissue of coating is relatively
For densification, in conjunction with preferable, non-melting zone domain to occur；Coating void is of moderate size, shape is round and smooth, effectively reduces crackle
Generation, under lubricating condition, the hole in coating can store lubricating oil.
Fig. 2 is the XRD spectrum of TiCN-Cr ceramic on metal composite coating obtained above.As seen from the figure, prepared by the method
The coating principal phase for going out is TiC0.7N0.3, Cr dissolves in shape in TiCN lattice in the coating mainly in the form of Cr simple substance, on a small quantity
Become Cr-Ti-N ternary phase Cr0.5Ti0.5N.Hard phase Cr simple substance granule, as hardening constituent Dispersed precipitate in coating, effectively carries
The high hardness of coating and wearability.
With microhardness instrument, hardness test is carried out to TiCN-Cr ceramic on metal composite coating obtained above.This experiment
The imposed load time be 15s, magnitude of load select 100g, 200g, 300g.For the sake of contrasting, to TiCN coating (He J,
Zhang F,Mi P,et al.Microstructure and wear behavior of nano C-rich TiCN
coatings fabricated by reactive plasma spraying with Ti-graphite powders[J]
.Surface&Coatings Technology,2016,305:215-222.) carry out identical hardness test.By hard
The microhardness of coating is measured after degree test as shown in figure 3, there it can be seen that coating hardness is higher, in 1000Hv0.1More than,
Compared with TiCN coating, the microhardness of the TiCN-Cr ceramic on metal composite coating for preparing in this example is dramatically increased.
Stretching experiment is carried out to TiCN-Cr ceramic on metal composite coating obtained above, experiment uses Weihai City
The 100K newton universal hydraulic testing machine of the WE-100B model of testing machine Manufacturing Co., Ltd production, maximum experiment power is 100K
Newton, a diameter of 40mm of tensile test bar used.For the sake of contrasting, identical stretching experiment is carried out to TiCN coating, knot
Fruit is as shown in figure 4, the bond strength of TiCN-Cr ceramic on metal composite coating is significantly improved.
Frictional experiment is carried out to TiCN-Cr ceramic on metal composite coating obtained above.Slided to mill side using ring-block
Formula, upper friction pair is the experiment block with TiCN-Cr metal-cermic coating, and lower friction pair is that the hardness for obtaining through Overheating Treatment is
The GCr15 of 55～65HRC is to bull ring, and the way of contact of friction pair is link friction, and rotating speed is that 200r/min, fraction time is one
Hour, load is 500N.For the sake of contrasting, identical frictional experiment is carried out to TiCN metal-cermic coating.By rubbing
The wear extent of coating is measured after wiping experiment as shown in figure 5, there it can be seen that compared with TiCN coating, in the present embodiment
The wear rate of TiCN-Cr composite coating is far below TiCN coating, and TiCN-Cr ceramic on metal composite coating shows more excellent
Wearability.
Embodiment 2：
In the present embodiment, in 45# steel matrix specimen surface, micron-nanometer level is prepared using reaction and plasma spraying technique many
The TiCN-Cr ceramic on metal composite coating of yardstick, the coating principal phase for preparing is TiC0.7N0.3, Cr is in the coating mainly with Cr
In the form of simple substance, formation Cr-Ti-N ternary phase Cr in TiCN lattice is dissolved on a small quantity0.5Ti0.5N.
The preparation method of coating is as follows：
Using graphite as carbon source, it is 5 according to the mass ratio of Ti, C powder：1, before spray-on coating, pre- on steel matrix surface
First coating thickness is 110 μm of Ni-10%wtAl self-melting alloy powder body, as bottom (or bond coating), by the matter of Cr powder
Measure the original feeding composite granule that 30% acquisition of the quality for composite powder is sprayed, adjustment work electric current 500A, arc voltage
70V, is sprayed, and other steps are identical with example 1.
The SEM figure of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 1, and the tissue of coating is more
Densification, in conjunction with preferable, non-melting zone domain appearance；Coating void is of moderate size, shape is round and smooth, effectively reduces crackle
Produce.
The XRD spectrum of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 2, and the method is prepared
Coating principal phase be TiC0.7N0.3, Cr dissolve in the coating mainly in the form of Cr simple substance, on a small quantity in TiCN lattice formed
Cr-Ti-N ternary phase Cr0.5Ti0.5N.Hard phase Cr simple substance granule, as hardening constituent Dispersed precipitate in coating, effectively improves
The hardness of coating and wearability.
Such as hardness test in embodiment 1 is carried out to TiCN-Cr ceramic on metal composite coating obtained above, in order to contrast
For the sake of, identical hardness test is carried out to TiCN coating.The microhardness for measuring coating after hardness test is similar to Fig. 3
Shown, there it can be seen that coating hardness is higher, in 1000Hv0.1More than, compared with TiCN coating, prepare in this example
The microhardness of TiCN-Cr ceramic on metal composite coating is dramatically increased.
TiCN-Cr ceramic on metal composite coating obtained above is carried out as the stretching experiment in embodiment 1.In order to right
Compared with seeing, identical stretching experiment is carried out to TiCN coating, as a result similar to Figure 5, TiCN-Cr ceramic on metal is combined
The bond strength of coating is significantly improved.
TiCN-Cr ceramic on metal composite coating obtained above is carried out as the frictional experiment in example 1.In order to contrast
For the sake of, identical frictional experiment is carried out to TiCN coating.The wear extent for measuring coating after frictional experiment is similar to Fig. 5 institute
Show, there it can be seen that compared with TiCN coating, the wear rate of the TiCN-Cr composite coating in the present embodiment is far below TiCN
Coating, TiCN-Cr ceramic on metal composite coating shows more excellent wearability.
Embodiment 3：
In the present embodiment, in 304 stainless steel base specimen surfaces, micron-nanometer is prepared using reaction and plasma spraying technique
The multiple dimensioned TiCN-Cr ceramic on metal composite coating of level, the coating principal phase for preparing is TiC0.7N0.3, Cr is main in the coating
In the form of Cr simple substance, formation Cr-Ti-N ternary phase Cr in TiCN lattice is dissolved on a small quantity0.5Ti0.5N.
The preparation method of coating is as follows：
Using graphite as carbon source, it is 5 according to the mass ratio of Ti, C powder：1, before spray-on coating, pre- on steel matrix surface
First coating thickness is 110 μm of Ni-10%wtAl self-melting alloy powder body, as bottom (or bond coating), by the matter of Cr powder
Measure the original feeding composite granule that 25% acquisition of the quality for composite powder is sprayed, adjustment work electric current 500A, arc voltage
70V, is sprayed, and other steps are identical with example 1.
The SEM figure of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 1, and the tissue of coating is more
Densification, in conjunction with preferable, non-melting zone domain appearance；Coating void is of moderate size, shape is round and smooth, effectively reduces crackle
Produce.
The XRD spectrum of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 2, and the method is prepared
Coating principal phase be TiC0.7N0.3, Cr dissolve in the coating mainly in the form of Cr simple substance, on a small quantity in TiCN lattice formed
Cr-Ti-N ternary phase Cr0.5Ti0.5N.Hard phase Cr simple substance granule, as hardening constituent Dispersed precipitate in coating, effectively improves
The hardness of coating and wearability.
Such as hardness test in embodiment 1 is carried out to TiCN-Cr ceramic on metal composite coating obtained above, in order to contrast
For the sake of, identical hardness test is carried out to TiCN coating.The microhardness for measuring coating after hardness test is similar to Fig. 3
Shown, there it can be seen that coating hardness is higher, in 1000Hv0.1More than, compared with TiCN coating, prepare in this example
The microhardness of TiCN-Cr ceramic on metal composite coating is dramatically increased.
TiCN-Cr ceramic on metal composite coating obtained above is carried out as the stretching experiment in embodiment 1.In order to right
Compared with seeing, identical stretching experiment is carried out to TiCN coating, as a result similar to Figure 5, TiCN-Cr ceramic on metal is combined
The bond strength of coating is significantly improved.
TiCN-Cr ceramic on metal composite coating obtained above is carried out as the frictional experiment in example 1.In order to contrast
For the sake of, identical frictional experiment is carried out to TiCN coating.The wear extent for measuring coating after frictional experiment is similar to Fig. 5 institute
Show, there it can be seen that compared with TiCN coating, the wear rate of the TiCN-Cr composite coating in the present embodiment is far below TiCN
Coating, TiCN-Cr ceramic on metal composite coating shows more excellent wearability.
Embodiment 4：
In the present embodiment, in Al2O3Ceramic matrix specimen surface prepares micron-nanometer using reaction and plasma spraying technique
The multiple dimensioned TiCN-Cr ceramic on metal composite coating of level, the coating principal phase for preparing is TiC0.7N0.3, Cr is main in the coating
In the form of Cr simple substance, formation Cr-Ti-N ternary phase Cr in TiCN lattice is dissolved on a small quantity0.5Ti0.5N.
The preparation method of coating is as follows：
Using graphite as carbon source, it is 5 according to the mass ratio of Ti, C powder：1, before spray-on coating, pre- on steel matrix surface
First coating thickness is 110 μm of Ni-10%wtAl self-melting alloy powder body, as bottom (or bond coating), by the matter of Cr powder
Measure the original feeding composite granule that 30% acquisition of the quality for composite powder is sprayed, adjustment work electric current 500A, arc voltage
70V, is sprayed, and other steps are identical with example 1.
The SEM figure of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 1, and the tissue of coating is more
Densification, in conjunction with preferable, non-melting zone domain appearance；Coating void is of moderate size, shape is round and smooth, effectively reduces crackle
Produce.
The XRD spectrum of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 2, and the method is prepared
Coating principal phase be TiC0.7N0.3, Cr dissolve in the coating mainly in the form of Cr simple substance, on a small quantity in TiCN lattice formed
Cr-Ti-N ternary phase Cr0.5Ti0.5N.Hard phase Cr simple substance granule, as hardening constituent Dispersed precipitate in coating, effectively improves
The hardness of coating and wearability.
Such as hardness test in embodiment 1 is carried out to TiCN-Cr ceramic on metal composite coating obtained above, in order to contrast
For the sake of, identical hardness test is carried out to TiCN coating.The microhardness for measuring coating after hardness test is similar to Fig. 3
Shown, there it can be seen that coating hardness is higher, in 1000Hv0.1More than, compared with TiCN coating, prepare in this example
The microhardness of TiCN-Cr ceramic on metal composite coating is dramatically increased.
TiCN-Cr ceramic on metal composite coating obtained above is carried out as the stretching experiment in embodiment 1.In order to right
Compared with seeing, identical stretching experiment is carried out to TiCN coating, as a result similar to Figure 5, TiCN-Cr ceramic on metal is combined
The bond strength of coating is significantly improved.
TiCN-Cr ceramic on metal composite coating obtained above is carried out as the frictional experiment in example 1.In order to contrast
For the sake of, identical frictional experiment is carried out to TiCN coating.The wear extent for measuring coating after frictional experiment is similar to Fig. 5 institute
Show, there it can be seen that compared with TiCN coating, the wear rate of the TiCN-Cr composite coating in the present embodiment is far below TiCN
Coating, TiCN-Cr ceramic on metal composite coating shows more excellent wearability.
Embodiment 5：
In the present embodiment, in Al2O3Ceramic matrix specimen surface prepares micron-nanometer using reaction and plasma spraying technique
The multiple dimensioned TiCN-Cr ceramic on metal composite coating of level, the coating principal phase for preparing is TiC0.7N0.3, Cr is main in the coating
In the form of Cr simple substance, formation Cr-Ti-N ternary phase Cr in TiCN lattice is dissolved on a small quantity0.5Ti0.5N.
The preparation method of coating is as follows：
Using graphite as carbon source, it is 6 according to the mass ratio of Ti, C powder：1, before spray-on coating, pre- on steel matrix surface
First coating thickness is 110 μm of Ni-10%wtAl self-melting alloy powder body, as bottom (or bond coating), by the matter of Cr powder
Measure the original feeding composite granule that 10% acquisition of the quality for composite powder is sprayed, adjustment work electric current 500A, arc voltage
60V, is sprayed, and other steps are identical with example 1.
The SEM figure of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 1, and the tissue of coating is more
Densification, in conjunction with preferable, non-melting zone domain appearance；Coating void is of moderate size, shape is round and smooth, effectively reduces crackle
Produce.
The XRD spectrum of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 2, and the method is prepared
Coating principal phase be TiC0.7N0.3, Cr dissolve in the coating mainly in the form of Cr simple substance, on a small quantity in TiCN lattice formed
Cr-Ti-N ternary phase Cr0.5Ti0.5N.Hard phase Cr simple substance granule, as hardening constituent Dispersed precipitate in coating, effectively improves
The hardness of coating and wearability.
Such as hardness test in embodiment 1 is carried out to TiCN-Cr ceramic on metal composite coating obtained above, in order to contrast
For the sake of, identical hardness test is carried out to TiCN coating.The microhardness for measuring coating after hardness test is similar to Fig. 3
Shown, there it can be seen that coating hardness is higher, in 1000Hv0.1More than, compared with TiCN coating, prepare in this example
The microhardness of TiCN-Cr ceramic on metal composite coating is dramatically increased.
TiCN-Cr ceramic on metal composite coating obtained above is carried out as the stretching experiment in embodiment 1.In order to right
Compared with seeing, identical stretching experiment is carried out to TiCN coating, as a result similar to Figure 5, TiCN-Cr ceramic on metal is combined
The bond strength of coating is significantly improved.
TiCN-Cr ceramic on metal composite coating obtained above is carried out as the frictional experiment in example 1.In order to contrast
For the sake of, identical frictional experiment is carried out to TiCN coating.The wear extent for measuring coating after frictional experiment is similar to Fig. 5 institute
Show, there it can be seen that compared with TiCN coating, the wear rate of the TiCN-Cr composite coating in the present embodiment is far below TiCN
Coating, TiCN-Cr ceramic on metal composite coating shows more excellent wearability.
Embodiment described above has been described in detail to technical scheme, it should be understood that the above is only
For the specific embodiment of the present invention, the present invention is not limited to, all any modifications that is made in the spirit of the present invention,
Supplementary or similar fashion replacement etc., should be included within the scope of the present invention.
Unaccomplished matter of the present invention is known technology.
Claims (7)
1. a kind of preparation method of the TiCN base composite coating containing Cr, it is characterized by the method is comprised the following steps：
Step 1, matrix specimen surface is roughened；
Step 2, Ti/C composite powder and Cr powder are passed through mechanical mixture, obtain original feeding composite granule；
Described Ti/C composite powder is that Ti powder and C powder are obtained by the method for mist projection granulating, mass ratio Ti：C=4~8：1, described
C is graphite；The quality of Cr powder is the 10% ~ 30% of the quality of Ti/C composite powder；
Step 3, Ni-10%wtAl self-melting alloy powder body being sprayed in advance in matrix surface, obtains the bottom that thickness is for 90 ~ 120 μm
Layer；
Step 4, original feeding composite granule is added in plasma spraying equipment, then reaction and plasma spraying method is adopted,
Bottom surface is sprayed to, TiCN-Cr ceramic on metal composite coating is obtained, the thickness of coating is 300 ~ 500 μm；
Wherein, spray parameters are set to：450 ~ 500A of operating current；55 ~ 75V of arc voltage；20 ~ 40L/min of argon flow amount, pressure
0.6 ~ 0.8MPa of power；4 ~ 8L/min of nitrogen flow, 0.6 ~ 0.8MPa of pressure；2 ~ 5 L/min of powder feeding rate；Spray distance 80 ~
120mm；Spray angle is 90 °；Wherein nitrogen is used as powder feeding gas, and argon is used as protective gas.
2. the preparation method of the TiCN base composite coating of Cr is contained as claimed in claim 1, it is characterized by described Ni-Al powder
Granularity be -150 mesh of mesh ~+350.
3. the preparation method of the TiCN base composite coating of Cr is contained as claimed in claim 1, it is characterized by thick in described step 1
Roughening processing method is sandblasting, sand papering or machining are roughened.
4. the preparation method of the TiCN base composite coating of Cr is contained as claimed in claim 1, it is characterized by described matrix is gold
Category or ceramic material.
5. the preparation method of the TiCN base composite coating of Cr is contained as claimed in claim 4, it is characterized by described metal is not for
Rust steel, aluminium alloy, titanium alloy or copper.
6. the preparation method of the TiCN base composite coating of Cr is contained as claimed in claim 1, it is characterized by the grain of described Ti powder
Spend for -270 mesh of mesh ~ -300, the granularity of graphite powder is+10000 mesh, the granularity of Cr powder is+270 mesh of mesh ~+330.
7. the preparation method of the TiCN base composite coating of Cr is contained as claimed in claim 1, it is characterized by described Ni-Al is certainly molten
Property alloy powder in, preferably the quality of Al for powder quality 10%.
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