CN106435445B - A kind of preparation method of the TiCN base composite coatings containing Cr - Google Patents
A kind of preparation method of the TiCN base composite coatings containing Cr 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
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Abstract
The present invention is a kind of preparation method of the TiCN base composite coatings containing Cr.This approach includes the following steps：Step 1 is roughened matrix specimen surface；Step 2, by Ti/C composite powders and Cr powder by mechanical mixture, obtain original feeding composite granule；Step 3 sprays Ni 10%wtAl self-melting alloy powders in advance in matrix surface, obtains the bottom that thickness is 90 ~ 120 μm；Original feeding composite granule is sprayed to bottom surface by step 4, obtains TiCN Cr ceramic on metal composite coatings, the thickness of coating is 300 ~ 500 μm.Plasma spraying TiCN Cr ceramic on metal composite coatings provided by the present invention have high hardness, good wear-and corrosion-resistant performance, suitable for workpiece under abrasion, corrosion working conditions, such as the fields such as the machineries such as cutting tool, drill bit, mold, automobile making and aerospace, there is extremely wide application prospect.
Description
Technical field
The present invention relates to a kind of preparation method of spray-on coating more particularly to it is 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 high temperature resistance, mechanical chemical industry, automobile making and
Many fields such as aerospace are widely used.
Currently, preparing TiCN generally uses plasma asistance vapour deposition process (PACVD), chemical vapour deposition technique (CVD)
With the surface treatment methods such as ion implanting, although these methods achieve progress outstanding on preparing TiCN coatings, by
In these methods, that there are deposition efficiencies is low (2~10 μm/h), and the thickness of film is excessively thin (10~50 μm), the combination of coating and matrix compared with
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 journals, 2004,25 (5):851-853.), it is difficult to the Service Environment etc. under heavy load abrasion is adapted to,
Its intrinsic performance cannot be given full play to, to constrain the application of TiCN.
Plasma spraying has the characteristics that simple for process, flexible and convenient, workpiece without redesigning.Reaction and plasma spraying
Integrate plasma spraying and self- propagating technology, preparation efficiency height is at low cost, is suitable for various sizes piece surface.
It is prepared by mixing into the composite powder suitable for spraying by carbon source and micron order Ti powder of cheap graphite or carbon powder, is sent into
With C, N Self-propagating Reaction Synthesis nanocrystalline TiCN coatings (Zhu Lin, He Jining, the Yan occur for nitrogenous high-temperature plasma flame stream, Ti
Hall is right, waits plasma sprayings synthesis TiCN thick coatings and its friction and wear characteristic [J] Science Bulletins, 2007,52 (8):972-
977.).Since coating is single nanocrystalline coating, the nanocrystalline stress caused in coating for being orientated complexity is higher, although applying
Layer hardness increases, but abrasion under the conditions of top load cannot still meet the requirement of service condition.
Invention content
The technical purpose of the present invention is the deficiency for above-mentioned plasma spraying TiCN coatings, provides a kind of plasma spray
(composition of coating becomes micro- to micron-nanometer grade Multi-scale model TiCN-Cr prepared by painting from nano level TiCN ceramic coatings
Rice-nanoscale Multi-scale model TiCN-Cr) ceramic on metal composite coating.This method is added in titanium carbon compound spraying powder
Cr ingredients, further improve the hardness of TiCN ceramic coatings, overcome the disadvantage of TiCN ceramic coatings wearability deficiency, and
And significantly enhance the bond strength of TiCN ceramic coatings and matrix.
The technical scheme is that：
A kind of preparation method of the TiCN base composite coatings containing Cr, includes the following steps：
Step 1 is roughened matrix specimen surface；
Step 2, by Ti/C composite powders and Cr powder by mechanical mixture, obtain original feeding composite granule；
The Ti/C composite powders are that Ti powder and C powder are made by the method for mist projection granulating, mass ratio Ti：C=4~8：1,
The C is graphite；The quality of Cr powder is the 10%~30% of the quality of Ti/C composite powders；
Step 3 sprays Ni-10%wtAl self-melting alloy powders in advance in matrix surface, and it is 90~120 μm to obtain thickness
Bottom；
Original feeding composite granule is added in plasma spraying equipment by step 4, then uses reaction and plasma spraying
Method sprays to bottom surface, obtains TiCN-Cr ceramic on metal composite coatings, the thickness of coating is 300~500 μm；
Wherein, spray parameters are set as：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 as powder feeding gas, and argon gas is as protective gas.
The granularity of the Ni-Al powder is the mesh of -150 mesh~+350, i.e., the powder diameter is in 38 μm to 74 μm mesh ranges
It is interior；
Roughening treatment method is sandblasting, sand paper polishing or mechanical processing roughening in the step 1.
The matrix is metal or ceramic material.
The metal is stainless steel, aluminium alloy, titanium alloy or copper.
The granularity of the Ti powder is the mesh of -270 mesh~-300, and the granularity of graphite powder is+10000 mesh, the granularity of Cr powder is+
The mesh of 270 mesh~+330.
In the Ni-Al self-melting alloy powders, preferably the quality of Al is the 10% of powder quality.
Compared with prior art, the present invention provides a kind of titanium carbon compound spraying powder containing Cr, utilizes plasma spraying
The powder spray is formed TiCN-Cr ceramic on metal composite coatings, this hair by technology after metal or ceramic matrix surface
Bright advantageous 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
Excessive oxidation, to improve the compactness of coat inside structure after spraying, and obtained coating porosity size is suitable after spraying
In, shape is round and smooth, to effectively reduce the generation of crackle；
(2) the coating main phase that this method is prepared is TiC0.7N0.3, coated grains size is between 60~100nm, coating
For micron-nanometer grade Multi-scale model coating, large block amorphous phase is in addition dispersed in coating.Cr is in the coating mainly with Cr simple substance
Form exist, dissolve in form Cr-Ti-N ternary phases Cr in TiCN lattices on a small quantity0.5Ti0.5N.Hard phase Cr simple substance particle conducts
Hardening constituent Dispersed precipitate is effectively improved the hardness and wearability of coating in coating.With single TiCN nanocrystalline coatings
It compares, the case hardness of TiCN-Cr ceramic on metal composite coatings prepared by this method is by 1674Hv0.1Increase to 1800Hv0.1,
Hardness significantly improves；Compared with single TiCN nanocrystalline coatings, measured after identical frictional experiment the wear extent of coating by
0.0028g is reduced to 0.0007g, i.e. wear extent reduces 68% or so, and wearability significantly improves；
(3) it in the TiCN metal matrix ceramic composite coating forming processes of plasma spraying, is prepared by mechanical mixture and contains certain matter
The original feeding powder of the Cr ingredients of score is measured, on the one hand wherein Cr can be used as hard phase, enhance the hardness of coating and wear-resisting
Property；On the other hand the Binder Phase as composite coating, by forming certain thickness (Ti, Cr) C solid solution around hard phase
Clad structure is conducive to the caking property and compactness that enhance the internal structure of coating, compared with single TiCN nanocrystalline coatings,
The bond strength of TiCN-Cr ceramic on metal composite coatings prepared by this method increases to 28.66MPa by 25.21MPa, in conjunction with
Intensity significantly improves；
(4) there are certain crackle and holes for coating prepared by this technique, because coating produces during Melting And Solidification
Raw volume contraction, will produce thermal stress, under lubrication conditions, the hole in coating can store lubricating oil between layers.Cause
With the wear-out part in certain porosity, especially lubricant environment in this coating, be conducive to the antiwear and antifriction for improving coating
Energy.
Therefore, plasma spraying TiCN-Cr ceramic on metal composite coatings provided by the present invention have high hardness, good
Good wear-and corrosion-resistant performance, be suitable for the machineries such as workpiece, such as cutting tool, drill bit, mold under abrasion, corrosion working conditions,
The fields such as automobile making and aerospace have extremely wide application prospect.
Description of the drawings
Fig. 1 is the SEM figures of 45# steel matrix surface TiCN-Cr ceramic on metal composite coatings 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 coatings in the embodiment of the present invention 1；
Fig. 3 is the microhardness of 45# steel matrix surface TiCN-Cr ceramic on metal composite coatings 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 coatings 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 coatings in the embodiment of the present invention 1；
Specific implementation mode
Present invention is further described in detail for embodiment below in conjunction with the accompanying drawings, it should be pointed out that implementation as described below
Example is intended to be convenient for the understanding of the present invention, and does not play any restriction effect to it.
The granularity of Ti powder of the present invention is the mesh of -270 mesh~-300, and the granularity of graphite powder is about+10000 mesh, Cr powder
Granularity be the mesh of+270 mesh~+330.
Embodiment 1：
In the present embodiment, it is more that micron-nanometer grade prepared using reaction and plasma spraying technique in 45# steel matrix specimen surfaces
The TiCN-Cr ceramic on metal composite coatings of scale, the coating main phase prepared are TiC0.7N0.3, Cr in the coating mainly with
The form of Cr simple substance exists, and dissolves in form Cr-Ti-N ternary phases Cr in TiCN lattices on a small quantity0.5Ti0.5N。
The preparation method of the coating is as follows：
(1) 45# steel matrix samples are put into TPS-1 type vapour-pressure type sand-blasting machines, surface is carried out at blasted rough
Reason, abrasive grain are inhaled into nozzle, are accelerated in high pressure draught, are ejected into matrix surface, obtain clean, coarse surface, to
Increase the binding force between matrix and coating；
(2) use graphite as carbon source, the mass ratio according to Ti, C powder is 6：1, using mist projection granulating method prepare Ti,
The grain size of C composite powders, composite powder is 60~70 μm, Ti, C composite powder that will be prepared, by the matter that the quality of Cr powder is composite powder
The 20% of amount obtains the original feeding composite granule of spraying by the method for mechanical mixture, and the wherein granularity of Ti powder is -300
The granularity of mesh, 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 powders are sprayed in advance on steel matrix surface, obtain thickness
Degree is 100 μm of bottom (or bond coating), and wherein the granularity of Ni-10%wtAl powder is the mesh of -150 mesh~+350, the i.e. powder
Last grain size is within the scope of 38 μm to 74 μm mesh.Nickel alclad bond coating can realize the metallurgical binding on microcosmic, purpose with matrix
It is the bond strength enhanced between TiCN-Cr ceramic on metal composite coatings and matrix；
(4) the original feeding composite granule of mechanical mixture is put into the powder feeder of GP-80 type plasma spraying equipments,
It by powder feeding gas, is sent into the plasma flame flow of high temperature and high speed, specially：Matrix is fixed on spraying working platform, work is adjusted
Make electric current 500A；Arc voltage 60V；Powder feeding rate is 4L/min, and spray gun sweep 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 to spray, and obtains TiCN-Cr ceramic on metal composite coatings, the thickness of coating is about 400 μm.
Fig. 1 is the SEM figures of TiCN-Cr ceramic on metal composite coating obtained above.As can be seen that coating tissue compared with
For densification, in conjunction with preferable, occur without non-melting zone domain；Coating void is of moderate size, shape is round and smooth, effectively reduces crackle
Generation, under lubrication conditions, 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 this method
The coating main phase gone out is TiC0.7N0.3, Cr in the coating mainly in the form of Cr simple substance exist, dissolve in shape in TiCN lattices on a small quantity
At Cr-Ti-N ternary phases Cr0.5Ti0.5N.Hard phase Cr simple substance particles, as hardening constituent Dispersed precipitate in coating, effectively
Improve the hardness and wearability of coating.
Hardness test is carried out with microhardness tester to TiCN-Cr ceramic on metal composite coating obtained above.This experiment
Application load-time be 15s, magnitude of load select 100g, 200g, 300g.For the sake of comparing, to TiCN coatings (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 as shown in figure 3, there it can be seen that coating hardness is higher, in 1000Hv after degree test0.1More than,
Compared with TiCN coatings, the microhardness of the TiCN-Cr ceramic on metal composite coatings prepared in this example dramatically increases.
Stretching experiment is carried out to TiCN-Cr ceramic on metal composite coating obtained above, is tested using Weihai City
The 100K newton universal hydraulic testing machines of the WE-100B models 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 comparing, identical stretching experiment, knot are carried out to TiCN coatings
Fruit is as shown in figure 4, the bond strength of TiCN-Cr ceramic on metal composite coatings significantly improves.
Frictional experiment is carried out to TiCN-Cr ceramic on metal composite coating obtained above.Using ring-block sliding to mill side
Formula, secondary upper friction is the experiment block with TiCN-Cr metal-cermic coatings, and the lower secondary hardness to be obtained through Overheating Treatment of friction is
The GCr15 of 55~65HRC is to bull ring, and the secondary way of contact that rubs is link friction, and rotating speed 200r/min, fraction time is one
Hour, load 500N.For the sake of comparing, identical frictional experiment is carried out to TiCN metal-cermic coatings.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 coatings, in the present embodiment
The wear rate of TiCN-Cr composite coatings is far below TiCN coatings, and TiCN-Cr ceramic on metal composite coatings show more excellent
Wearability.
Embodiment 2：
In the present embodiment, it is more that micron-nanometer grade prepared using reaction and plasma spraying technique in 45# steel matrix specimen surfaces
The TiCN-Cr ceramic on metal composite coatings of scale, the coating main phase prepared are TiC0.7N0.3, Cr in the coating mainly with
The form of Cr simple substance exists, and dissolves in form Cr-Ti-N ternary phases Cr in TiCN lattices on a small quantity0.5Ti0.5N。
The preparation method of coating is as follows：
Using graphite as carbon source, the mass ratio according to Ti, C powder is 5：1, it is pre- on steel matrix surface before spray-on coating
The Ni-10%wtAl self-melting alloy powders that first coating thickness is 110 μm, as bottom (or bond coating), by the matter of Cr powder
Amount is the original feeding composite granule of 30% acquisition spraying of the quality of composite powder, adjusts operating current 500A, arc voltage
70V is sprayed, other steps are identical as example 1.
The SEM figures of TiCN-Cr ceramic on metal composite coating obtained above are similar to Figure 1, and the tissue of coating is more
Densification, in conjunction with preferable, no non-melting zone domain appearance；Coating void is of moderate size, shape is round and smooth, effectively reduces crackle
It generates.
The XRD spectrum of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 2, and this method is prepared
Coating main phase be TiC0.7N0.3, Cr in the coating mainly in the form of Cr simple substance exist, dissolve in TiCN lattices and formed on a small quantity
Cr-Ti-N ternary phases Cr0.5Ti0.5N.Hard phase Cr simple substance particles are effectively carried as hardening constituent Dispersed precipitate in coating
The high hardness and wearability of coating.
Hardness test in such as embodiment 1 is carried out to TiCN-Cr ceramic on metal composite coating obtained above, in order to compare
For the sake of, identical hardness test is carried out to TiCN coatings.By measuring the microhardness of coating after hardness test similar to Fig. 3
It is shown, there it can be seen that coating hardness is higher, in 1000Hv0.1More than, compared with TiCN coatings, prepared in this example
The microhardness of TiCN-Cr ceramic on metal composite coatings dramatically increases.
TiCN-Cr ceramic on metal composite coating obtained above is carried out such as the stretching experiment in embodiment 1.In order to right
Compared with seeing, identical stretching experiment is carried out to TiCN coatings, as a result similar to Figure 5, TiCN-Cr ceramic on metal is compound
The bond strength of coating significantly improves.
TiCN-Cr ceramic on metal composite coating obtained above is carried out such as the frictional experiment in example 1.In order to compare
For the sake of, identical frictional experiment is carried out to TiCN coatings.By measuring the wear extent of coating after frictional experiment similar to Fig. 5 institutes
Show, there it can be seen that compared with TiCN coatings, the wear rate of the TiCN-Cr composite coatings in the present embodiment is far below TiCN
Coating, TiCN-Cr ceramic on metal composite coatings show more excellent wearability.
Embodiment 3：
In the present embodiment, micron-nanometer is prepared using reaction and plasma spraying technique in 304 stainless steel base specimen surfaces
The multiple dimensioned TiCN-Cr ceramic on metal composite coatings of grade, the coating main phase prepared are TiC0.7N0.3, Cr is main in the coating
Exist in the form of Cr simple substance, dissolves in form Cr-Ti-N ternary phases Cr in TiCN lattices on a small quantity0.5Ti0.5N。
The preparation method of coating is as follows：
Using graphite as carbon source, the mass ratio according to Ti, C powder is 5：1, it is pre- on steel matrix surface before spray-on coating
The Ni-10%wtAl self-melting alloy powders that first coating thickness is 110 μm, as bottom (or bond coating), by the matter of Cr powder
Amount is the original feeding composite granule of 25% acquisition spraying of the quality of composite powder, adjusts operating current 500A, arc voltage
70V is sprayed, other steps are identical as example 1.
The SEM figures of TiCN-Cr ceramic on metal composite coating obtained above are similar to Figure 1, and the tissue of coating is more
Densification, in conjunction with preferable, no non-melting zone domain appearance；Coating void is of moderate size, shape is round and smooth, effectively reduces crackle
It generates.
The XRD spectrum of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 2, and this method is prepared
Coating main phase be TiC0.7N0.3, Cr in the coating mainly in the form of Cr simple substance exist, dissolve in TiCN lattices and formed on a small quantity
Cr-Ti-N ternary phases Cr0.5Ti0.5N.Hard phase Cr simple substance particles are effectively carried as hardening constituent Dispersed precipitate in coating
The high hardness and wearability of coating.
Hardness test in such as embodiment 1 is carried out to TiCN-Cr ceramic on metal composite coating obtained above, in order to compare
For the sake of, identical hardness test is carried out to TiCN coatings.By measuring the microhardness of coating after hardness test similar to Fig. 3
It is shown, there it can be seen that coating hardness is higher, in 1000Hv0.1More than, compared with TiCN coatings, prepared in this example
The microhardness of TiCN-Cr ceramic on metal composite coatings dramatically increases.
TiCN-Cr ceramic on metal composite coating obtained above is carried out such as the stretching experiment in embodiment 1.In order to right
Compared with seeing, identical stretching experiment is carried out to TiCN coatings, as a result similar to Figure 5, TiCN-Cr ceramic on metal is compound
The bond strength of coating significantly improves.
TiCN-Cr ceramic on metal composite coating obtained above is carried out such as the frictional experiment in example 1.In order to compare
For the sake of, identical frictional experiment is carried out to TiCN coatings.By measuring the wear extent of coating after frictional experiment similar to Fig. 5
Shown, there it can be seen that compared with TiCN coatings, the wear rate of the TiCN-Cr composite coatings in the present embodiment is far below
TiCN coatings, TiCN-Cr ceramic on metal composite coatings show 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 coatings of grade, the coating main phase prepared are TiC0.7N0.3, Cr is main in the coating
Exist in the form of Cr simple substance, dissolves in form Cr-Ti-N ternary phases Cr in TiCN lattices on a small quantity0.5Ti0.5N。
The preparation method of coating is as follows：
Using graphite as carbon source, the mass ratio according to Ti, C powder is 5：1, it is pre- on steel matrix surface before spray-on coating
The Ni-10%wtAl self-melting alloy powders that first coating thickness is 110 μm, as bottom (or bond coating), by the matter of Cr powder
Amount is the original feeding composite granule of 30% acquisition spraying of the quality of composite powder, adjusts operating current 500A, arc voltage
70V is sprayed, other steps are identical as example 1.
The SEM figures of TiCN-Cr ceramic on metal composite coating obtained above are similar to Figure 1, and the tissue of coating is more
Densification, in conjunction with preferable, no non-melting zone domain appearance；Coating void is of moderate size, shape is round and smooth, effectively reduces crackle
It generates.
The XRD spectrum of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 2, and this method is prepared
Coating main phase be TiC0.7N0.3, Cr in the coating mainly in the form of Cr simple substance exist, dissolve in TiCN lattices and formed on a small quantity
Cr-Ti-N ternary phases Cr0.5Ti0.5N.Hard phase Cr simple substance particles are effectively carried as hardening constituent Dispersed precipitate in coating
The high hardness and wearability of coating.
Hardness test in such as embodiment 1 is carried out to TiCN-Cr ceramic on metal composite coating obtained above, in order to compare
For the sake of, identical hardness test is carried out to TiCN coatings.By measuring the microhardness of coating after hardness test similar to Fig. 3
It is shown, there it can be seen that coating hardness is higher, in 1000Hv0.1More than, compared with TiCN coatings, prepared in this example
The microhardness of TiCN-Cr ceramic on metal composite coatings dramatically increases.
TiCN-Cr ceramic on metal composite coating obtained above is carried out such as the stretching experiment in embodiment 1.In order to right
Compared with seeing, identical stretching experiment is carried out to TiCN coatings, as a result similar to Figure 5, TiCN-Cr ceramic on metal is compound
The bond strength of coating significantly improves.
TiCN-Cr ceramic on metal composite coating obtained above is carried out such as the frictional experiment in example 1.In order to compare
For the sake of, identical frictional experiment is carried out to TiCN coatings.By measuring the wear extent of coating after frictional experiment similar to Fig. 5
Shown, there it can be seen that compared with TiCN coatings, the wear rate of the TiCN-Cr composite coatings in the present embodiment is far below
TiCN coatings, TiCN-Cr ceramic on metal composite coatings show 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 coatings of grade, the coating main phase prepared are TiC0.7N0.3, Cr is main in the coating
Exist in the form of Cr simple substance, dissolves in form Cr-Ti-N ternary phases Cr in TiCN lattices on a small quantity0.5Ti0.5N。
The preparation method of coating is as follows：
Using graphite as carbon source, the mass ratio according to Ti, C powder is 6：1, it is pre- on steel matrix surface before spray-on coating
The Ni-10%wtAl self-melting alloy powders that first coating thickness is 110 μm, as bottom (or bond coating), by the matter of Cr powder
Amount is the original feeding composite granule of 10% acquisition spraying of the quality of composite powder, adjusts operating current 500A, arc voltage
60V is sprayed, other steps are identical as example 1.
The SEM figures of TiCN-Cr ceramic on metal composite coating obtained above are similar to Figure 1, and the tissue of coating is more
Densification, in conjunction with preferable, no non-melting zone domain appearance；Coating void is of moderate size, shape is round and smooth, effectively reduces crackle
It generates.
The XRD spectrum of TiCN-Cr ceramic on metal composite coating obtained above is similar to Figure 2, and this method is prepared
Coating main phase be TiC0.7N0.3, Cr in the coating mainly in the form of Cr simple substance exist, dissolve in TiCN lattices and formed on a small quantity
Cr-Ti-N ternary phases Cr0.5Ti0.5N.Hard phase Cr simple substance particles are effectively carried as hardening constituent Dispersed precipitate in coating
The high hardness and wearability of coating.
Hardness test in such as embodiment 1 is carried out to TiCN-Cr ceramic on metal composite coating obtained above, in order to compare
For the sake of, identical hardness test is carried out to TiCN coatings.By measuring the microhardness of coating after hardness test similar to Fig. 3
It is shown, there it can be seen that coating hardness is higher, in 1000Hv0.1More than, compared with TiCN coatings, prepared in this example
The microhardness of TiCN-Cr ceramic on metal composite coatings dramatically increases.
TiCN-Cr ceramic on metal composite coating obtained above is carried out such as the stretching experiment in embodiment 1.In order to right
Compared with seeing, identical stretching experiment is carried out to TiCN coatings, as a result similar to Figure 5, TiCN-Cr ceramic on metal is compound
The bond strength of coating significantly improves.
TiCN-Cr ceramic on metal composite coating obtained above is carried out such as the frictional experiment in example 1.In order to compare
For the sake of, identical frictional experiment is carried out to TiCN coatings.By measuring the wear extent of coating after frictional experiment similar to Fig. 5 institutes
Show, there it can be seen that compared with TiCN coatings, the wear rate of the TiCN-Cr composite coatings in the present embodiment is far below TiCN
Coating, TiCN-Cr ceramic on metal composite coatings show more excellent wearability.
Technical scheme of the present invention is described in detail in embodiment described above, it should be understood that the above is only
For specific embodiments of the present invention, it is not intended to restrict the invention, all any modifications made in the spirit of the present invention,
Supplement or similar fashion replacement etc., should all be included in the protection scope of the present invention.
Unaccomplished matter of the present invention is known technology.
Claims (3)
1. a kind of preparation method of the TiCN base composite coatings containing Cr, it is characterized in that this approach includes the following steps：
Step 1 is roughened matrix specimen surface；
Step 2, by Ti/C composite powders and Cr powder by mechanical mixture, obtain original feeding composite granule；
The Ti/C composite powders are that Ti powder and C powder are made by the method for mist projection granulating, mass ratio Ti：C=4~8：1, it is described
C be graphite；The quality of Cr powder is the 10%~30% of the quality of Ti/C composite powders；
Step 3 sprays Ni-10%wtAl self-melting alloy powders in advance in matrix surface, obtains the bottom that thickness is 90~120 μm
Layer；
Original feeding composite granule is added in plasma spraying equipment by step 4, then uses reaction and plasma spraying method,
Bottom surface is sprayed to, obtains TiCN-Cr ceramic on metal composite coatings, the thickness of coating is 300~500 μm；
Wherein, spray parameters are set as：450~500A of operating current；55~75V of arc voltage；20~40L/ of argon flow amount
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；Spraying
80~120mm of distance；Spray angle is 90 °；Wherein nitrogen is as powder feeding gas, and argon gas is as protective gas；
The matrix is metal or ceramic material；
The metal is stainless steel, aluminium alloy, titanium alloy or copper；
The granularity of the Ti powder is the mesh of -270 mesh~-300, and the granularity of graphite powder is+10000 mesh, and the granularity of Cr powder is+270
The mesh of mesh~+330；
In the Ni-10%wtAl self-melting alloy powders, the quality of Al is the 10% of powder quality.
2. the preparation method of the TiCN base composite coatings containing Cr as described in claim 1, it is characterized in that the Ni-10%
The granularity of wtAl self-melting alloy powders is the mesh of -150 mesh~+350.
3. the preparation method of the TiCN base composite coatings containing Cr as described in claim 1, it is characterized in that thick in the step 1
Roughening processing method is sandblasting, sand paper polishing or mechanical processing roughening.
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