CN103774138A - Method for preparing self-lubricating coating on laser cladding titanium alloy surface - Google Patents
Method for preparing self-lubricating coating on laser cladding titanium alloy surface Download PDFInfo
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Abstract
The invention discloses a method for preparing a self-lubricating coating on a laser cladding titanium alloy surface. The method comprises the following steps: 1) carrying out pretreatment on a to-be-cladded surface of a titanium alloy substrate, namely removing an oxidation film on the to-be-cladded surface of the titanium alloy substrate; 2) preparing a cladding material, wherein the formula of the cladding material is prepared from NiCrBSi alloy powder and Ni/MoS2 powder according to the mass ratio of (50-95):(5-50), and evenly mixing; 3) presetting the cladding material, firstly, blending the evenly mixed cladding material into paste by using a volatile organic solvent, coating on the to-be-cladded surface of the titanium alloy substrate, wherein the coating layer is 0.6-2.0mm thick, and then baking the coating layer; and 4) laser cladding, irradiating the coating layer by using a laser device, so that the cladding layer is cladded on the titanium alloy substrate. By adopting the method disclosed by the invention, the problem of low lubricating property caused by decomposition and evaporation of a solid lubricant can be solved, and the lubricating role can be better played.
Description
Technical field
The present invention relates to a kind of laser metal surface processing technology, be specially one and utilize high-energy-density laser beam cladding in-situ authigenic Cr
xs
ythe preparation method of the laser melting coating titanium alloy surface self-lubricating coating of lubricated Ni base composite coating.
Background technology
The research work of titanium alloy laser melting coating at present is mainly carried out around improving its wear resisting property, and wherein research is the metal-based compound coating that ceramic particle strengthens the most widely.Existing research roughly can be divided into following two kinds according to cladding material system.One is with Ti or Ti-6Al-4V alloy and WC, Cr
3c
2, B
4the powder mix of C, TiC, TiCN, CNT, BN is made cladding material, preparation Ti base composite coating.As Zhang Song (referring to Zhang Song, Zhang Chunhua, Wang Maocai, waits the Impact Abrasive Wear [J] of .TiC/Ti matrix material laser cladding layer. Acta Metallurgica Sinica, 2002,38 (10): 1100-1104.) etc. with Ti-Cr
3c
2make cladding material, obtained at TC4 alloy surface the Ti base composite coating that TiC particle strengthens, the shock resistance abrasive wear behavior of coating has improved 2 times than TC4 alloy.Savalani etc. (referring to: M M Savalani, C CNg, Q H Li, et al.In situ formation of titanium carbide using titanium and carbon-nanotube powders by laser cladding[J] .Applied Surface Science, 2012, 258:3173 – 3177.) at pure titanium surface laser cladding Ti and carbon nanotube, in laser cladding process, Ti and carbon nanotube react, generate tiny TiC dentrite, the hardness of coating and wear resisting property are subject to the impact of content of carbon nanotubes, along with the increase of content of carbon nanotubes, hardness raises, wear resistance increases.Another kind is with Ni base self-melting alloy and B
4c, Cr
3c
2, BN, TiN, graphite etc. powder mix make cladding material, preparation Ni base composite coating.If Meng etc. is (referring to Meng Qing Wu, Geng L, Zhang B Y.Laser cladding of Ni-base composite coatings onto Ti-6Al-4V substrates with pre-placed B
4c+NiCrBSi powders[J] .Surface and Coatings Technology, 2006,200 (16-17): 4923-4928.) at Ti-6Al-4V alloy surface laser melting coating NiCrBSi+B
4c, by B in laser cladding process
4c and Ti(derive from the fusing on base material top layer) between chemical reaction, obtained with TiB
2with the Ni base composite coating that TiC is wild phase, coating average hardness is HV1300.Molian etc. (referring to: P A Molian, L Hualum.Laser cladding of Ti-6Al-4V with BN for improved wear performance[J] .Wear, 1989,130:337-352) hardness and the polishing machine of Ti-6Al-4V alloy surface NiCrCoAlY-BN laser cladding layer are studied, result shows, the hardness of cladding layer increases with the increase of BN content, maximum hardness is HV1200, and wear rate has reduced by 1～2 order of magnitude than the titanium alloy of age hardening and laser surface remelting.
Laser melting coating metal-based self-lubricating compound coating has the antifriction performance of wear resistance, toughness and solid lubricant that metallic matrix is good concurrently, and its friction and wear behavior depends on kind, volume fraction, size and the distribution etc. of composition, tissue and the lubricant of metallic matrix.Ni base alloy is current most popular body material, and two chalcogen compounds, six side BN, fluorochemical all can be used as solid lubricant and use.Yang etc. (referring to: Maosheng Yang, Xiubo Liu, Jiwei Fan, et al.Microstructure and wear behaviors of laser clad NiCr/Cr
3c
2– WS
2high temperature self-lubricating wear-resistant composite coating[J] .Applied Surface Science, 2012,258:3757 – 3762.) at 0Cr18Ni9 stainless steel surface laser melting coating NiCr/Cr
3c
2-30%WS
2high-temperature self-lubricating coating, and and NiCr/Cr
3c
2coating compares.Result shows, laser melting coating NiCr/Cr
3c
2coating is by Cr
7c
3phase and γ-(Fe, Ni)/Cr
7c
3eutectic composition, and NiCr/Cr
3c
2-30%WS
2coating is by Cr
7c
3, γ-(Fe, Ni), (Cr, W) C and a small amount of WS
2composition (WS in laser cladding process
2occur to decompose and reaction), at room temperature, 300 ℃ and 600 ℃, NiCr/Cr
3c
2-30%WS
2the frictional coefficient of coating is all less than NiCr/Cr
3c
2the frictional coefficient of coating.Wang etc. (referring to: A H Wang, X L Zhang, X F Zhang.Ni-based alloy/submicron WS
2self-lubricating composite coating synthesized by Nd:YAG laser cladding[J] .Materials Science and Engineering A, 2008,475:312 – 318.) adopt YAG laser apparatus at 45 steel surface cladding Ni base WS
2coating, prepares nanometer Ni bag submicron order WS by high-energy ball milling
2powder stops WS in laser cladding process
2oxidation, decomposition, evaporation, and improve WS
2wettability with Ni60 matrix.Result shows: laser melting coating Ni60-WS
2the frictional coefficient (0.36) of coating compares Ni45-WS
2-CaF
2coating (0.45～0.55) and Ni60 coating (0.5～0.6) are low, and antiwear property is also coated with 3 times of floor heights than laser melting coating Ni60.Liu Xiubo etc. (referring to: Liu Xiubo, Shi Shihong, Fu Geyan, etc. gamma-TiAl alloy Ni-Cr-C-CaF
2matrix material laser melting coating [J]. Chinese laser, 2009,36 (6): 1591-1594.) at gamma-TiAl alloy surface laser cladding Ni-Cr-C-CaF
2self-lubricating coat in use, although select lower laser energy density, due to CaF
2fusing point and density lower, and poor with metallic matrix consistency, CaF
2floating, decomposition and evaporation are there is to a certain extent.The further research of Liu etc. shows, uses the coated CaF of Ni-P electroless plating
2method, can improve CaF
2with the wettability of metallic matrix, and reduce its decomposition and evaporation degree in the time of laser irradiation, make the CaF of some amount
2be retained in coating.
From above-mentioned, laser melting coating self-lubrication coating material is extensive, and is not subject to common metallurgical thermodynamics condition restriction.But, because laser melting coating Heating temperature is high, the thermostability of solid lubricant is poor in addition, and in laser cladding process, most of solid lubricant will occur to decompose and evaporation, only have a small amount of lubricant to be retained in coating, greatly reduce the self-lubricating property of coating.Although people have taked optimization laser cladding technological parameter, solid lubricant powder have been coated to the measures such as processing, these measures can only reduce decomposition and the evaporation of lubricant to a certain extent, differ greatly with the effect of expecting.Therefore, how solving the lubricity that in laser cladding process, decomposition and the evaporation because of solid lubricant causes and reduce problem, is laser melting coating self-lubricating coat in use technology problem in the urgent need to address at present.
Summary of the invention
The present invention provides a kind of preparation method of laser melting coating titanium alloy surface self-lubricating coating for solving the technical problem existing in known technology, the method can solve the lubricity that in laser cladding process, decomposition and the evaporation because of solid lubricant causes and reduce problem, and the method technological process is simple, be applicable to suitability for industrialized production.
The technical scheme that the present invention takes for the technical problem existing in solution known technology is: a kind of preparation method of laser melting coating titanium alloy surface self-lubricating coating, comprises the following steps:
One) titanium alloy base material is fusion covers surface preparation: remove that titanium alloy base material is fusion covers surperficial oxide film;
Two) cladding material preparation: cladding material formula is NiCrBSi powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 50-95:5-50, and mixes;
Three) preset cladding material: first by the cladding material mixing with thering is volatile organic solvent furnishing pasty state, what be coated in titanium alloy base material treats cladding surface, coat thickness is 0.6～2.0mm, then coat is dried;
Four) laser melting coating: adopt laser illumination coat, make coat cladding on titanium alloy base material.
Described NiCrBSi alloy is Ni60, and granularity is-150～+ 300 orders; Described Ni/MoS
2moS in powder
2content is 20～30wt.%, described Ni/MoS
2the granularity of powder is-150～+ 300 orders.
In step 4) step 3 before) afterwards, the titanium alloy base material with coat is preheating to 120～160 ℃.
In step 1) step 2 afterwards) before, treat cladding surface and carry out Passivation Treatment.
Described step 4) employing YAG laser illumination coat, the output rating P=800～900W of laser apparatus, beam flying speed V=2～4mm/s, spot diameter D=1～3mm; In laser cladding process, adopt argon gas to protect molten bath, the flow of argon gas is 20～30L/min.
Described titanium alloy base material is any one in TC1, TC4 and TC9.
Advantage and positively effect that the present invention has are: adopt by NiCrBSi powdered alloy and Ni/MoS
2the cladding material of powder constituent, utilize the chemical reaction between cladding material constituent element in laser cladding process, form new lubricated phase at coating situ, not only can solve the lubricity causing because of decomposition and the evaporation of solid lubricant and reduce problem, and because new lubricating is the thermodynamically stable phase forming in laser cladding process mutually, there is and the advantage such as be evenly distributed good with titanium alloy base material metals compatible, can bring into play better its lubrication.And the present invention had carried out thermal pretreatment to the titanium alloy base material with coat before laser melting coating operation, reduce the thermal stresses in coating, therefore can reduce or eliminate the crackle in coating.
Accompanying drawing explanation
Fig. 1 is the pattern photo of cladding material NiCrBSi powdered alloy of the present invention;
Fig. 2 is wrapped MoS by the present invention adopts cladding material Ni
2the pattern photo of powder;
Fig. 3 is the pattern photo of single track laser cladding layer cross section of the present invention;
Fig. 4 is the pattern photo on single track laser cladding layer of the present invention surface;
Fig. 5 is laser cladding layer of the present invention top layer metallographic structure photo;
Fig. 6 is laser cladding layer bottom metallographic structure photo of the present invention;
Fig. 7 is laser cladding layer of the present invention and base material land metallographic structure photo;
Fig. 8 is that laser cladding layer microhardness of the present invention is along layer depth directivity curve figure;
Fig. 9 is the frictional coefficient graphic representation of laser cladding layer of the present invention;
Figure 10 is the metallograph of base material TC4 alloy worn surface;
Figure 11 is the metallograph of laser cladding layer worn surface of the present invention.
Embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
The preparation method's of a kind of laser melting coating titanium alloy surface self-lubricating of the present invention coating mentality of designing:
One) guaranteeing under the prerequisite of cladding layer and titanium alloy base material metallurgical binding, utilize the chemical reaction between cladding material constituent element in laser cladding process, form new lubricated phase at coating situ, to alleviate or to avoid the Problem of Failure causing because of decomposition and the evaporation of solid lubricant.
Two) before cladding, the titanium alloy base material with coat is carried out to preheating, the temperature rise when reducing cladding, and then reduce the thermal stresses forming because of cladding, reduce or eliminate the crackle in laser cladding layer.
The present invention has carried out innovative design from aspects such as laser cladding of material design, the surface preparation of titanium alloy base material and laser melting and coating process optimizations:
One) design of laser cladding of material
The design of laser cladding of material must be considered the problem of the following aspects:
1) should there is higher hardness and self-lubricating property.
2) between laser cladding of material and titanium alloy base material, should there is good metallurgical consistency.
According to mentioned above principle, the present invention adopts by NiCrBSi powdered alloy and the coated MoS of Ni
2the cladding material of powder constituent, while adopting laser melting coating to form cladding layer on titanium alloy base material surface, by the coated MoS of Ni
2s source is provided, reacts with the Cr element in NiCrBSi powdered alloy, original position forms new lubricated phase Cr
xs
y, to alleviate or to avoid because of solid lubricant-MoS
2decomposition and the lubricity that causes of evaporation decline.
Two) pre-treatment of titanium alloy base material
The avidity of titanium and oxygen is very large, just can be combined with airborne oxygen and form the thin film of titanium oxide of one deck densification, and this oxidation film layer is difficult to thoroughly remove under normal temperature, affects the combination between cladding layer and base material.For this reason, the present invention adopts the striping method of mechanical means and chemical process associating.
Three) optimization of laser cladding method
1) in laser cladding process, strengthen the protection to deposite metal, to prevent the immersion of ambient air; Adopt argon gas to protect molten bath.
2) regulate and control the laser works parameters such as laser power, laser beam flying speed and spot diameter, the quality influence of the working parameter of analysis laser apparatus to cladding layer both macro and micro, reasonable in design and best processing parameter.
The preparation method of a kind of laser melting coating titanium alloy surface self-lubricating of the present invention coating, comprises the following steps:
One) titanium alloy base material is fusion covers surface preparation: remove that titanium alloy base material is fusion covers surperficial oxide film;
Two) cladding material preparation: cladding material formula is NiCrBSi powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 50-95:5-50, and mixes.
Three) preset cladding material: first by the cladding material mixing with thering is volatile organic solvent furnishing pasty state, what be coated in titanium alloy base material treats cladding surface, coat thickness is 0.6～2.0mm, then coat is dried.
Four) laser melting coating: adopt laser illumination coat, make coat cladding on titanium alloy base material.
For preventing that cladding layer from cracking, the present invention after preset cladding material, was preheating to 120～160 ℃ by the titanium alloy base material with coat before carrying out laser melting coating.
The present invention combines self propagating high temperature synthetic technology and laser melting and coating technique, designs by cladding material, utilizes the chemical reaction between cladding material constituent element in laser cladding process, in the synthetic new lubricated phase of cladding layer situ.Adopt NiCrBSi and Ni bag MoS
2make cladding material, pass through MoS
2the S source that provides is provided, and forms Cr with the Cr element generation chemical reaction in NiCrBSi alloy
xs
ynew lubricated phase; The element such as Ti and C and B entering in cladding layer due to diluting effect reacts simultaneously, generates TiC and TiB
2etc. ceramic hard phase, lubricate and make cladding layer there is higher hardness and good self-lubricating property with the acting in conjunction of hard phase.The present invention also, by mechanical means with chemical process combined removal oxide film and to removing the surface passivation of carrying out after oxide film, has thoroughly eliminated the oxide film of substrate surface, has eliminated the deleterious effect of oxide film.By the protection to laser molten pool and laser cladding technological parameter optimization, prevented the formation of the defect such as oxidation and pore of deposite metal, and then can obtain that moulding is good at titanium alloy surface, pore-free and crackle, in conjunction with cladding layer firmly.
The present invention does not address part and is applicable to prior art.
Provide specific embodiments of the invention below, but the present invention is not subject to the restriction of embodiment.
Embodiment 1:
A preparation method for laser melting coating titanium alloy surface self-lubricating coating, comprises the following steps:
One) titanium alloy base material is fusion covers surface preparation: remove that titanium alloy base material is fusion covers surperficial oxide film;
The material of titanium alloy base material is TC4 in the present embodiment.Remove the TC4 titanium alloy base material concrete grammar that covers surface film oxide fusion: first adopt 400# abrasive paper for metallograph to treat cladding surface and polish, then immerse in 10%NaOH solution 3 minutes, after taking-up, in distilled water, acetone and alcohol, carry out successively ultrasonic cleaning, final drying;
For preventing from treating cladding surface Quick Oxidation again, after cladding surface removal oxide film, Passivation Treatment is carried out on the cladding surface for the treatment of that reply is removed after oxide film, in an embodiment of the present invention, adopts nitric acid to carry out surface passivating treatment.
Two) cladding material preparation: cladding material formula is NiCrBSi powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 50:50, and mixes.
In the present embodiment, NiCrBSi powdered alloy adopts Ni60 powdered alloy.Referring to Fig. 1 and Fig. 2, shown in Fig. 1 is the pattern photo of Ni60 powdered alloy, and shown in Fig. 2 is Ni/MoS
2the pattern photo of powdered alloy, Ni60 powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 50:50.In an embodiment of the present invention, adopt the mixed powder of drum-type meal mixer, the mixed powder time is 8 hours, until Ni60 powdered alloy and Ni/MoS
2powder mixes.The granularity of Ni60 powdered alloy is-150～+ 300 orders; Should make Ni/MoS as far as possible
2the granularity of the granularity of powder and Ni60 powdered alloy is close so that mix, at the present embodiment, and described Ni/MoS
2the granularity of powder is-150 orders, described Ni/MoS
2moS in powder
2content be 25wt.%.
Three) preset cladding material: first by the cladding material mixing with thering is volatile organic solvent furnishing pasty state, what be coated in titanium alloy base material treats cladding surface, coat thickness is 1.0mm, then coat is dried.
In the present embodiment, adopt alcohol by cladding material furnishing pasty state, be coated in titanium alloy base material surface, be placed in vacuum oven and dry, bake out temperature is 70 ℃, and drying time is 1 hour.
Four) laser melting coating: adopt laser illumination coat, make coat cladding on titanium alloy base material.
In an embodiment of the present invention, adopt the coat on NCLT CW-1000 type YAG laser illumination titanium alloy surface, the processing parameter of laser melting coating is: laser output power P=800W, and beam flying speed V=2mm/s, spot diameter is D=1mm; In laser cladding process, adopt argon gas to protect molten bath, the flow of argon gas is 20L/min.
For preventing that cladding layer from cracking, the present embodiment after preset cladding material, was preheating to 150 ℃ by the titanium alloy base material with coat before carrying out laser melting coating.
Refer to Fig. 3 and Fig. 4, pore-free and defects i.e.cracks in cladding layer as seen from the figure, surperficial continuous uniform.Research and analyse and show by the pattern microtexture to cladding layer: laser cladding layer is by TiC and CrB particle, Cr
xs
yparticle and dentrite, eutectic matrix composition, refer to Fig. 5 and Fig. 6; The dentrite that is organized as oriented growth of laser cladding layer and titanium alloy base material land, and be epitaxial solidification feature with titanium alloy base material, make to have formed good metallurgical binding between cladding layer and titanium alloy base material, refer to Fig. 7.The hardness of cladding layer prepared by employing the present embodiment is at 850～950HV
0.2between, the hardness of base material is at 350HV
0.2left and right, the former is about 2～3 times of the latter, refers to Fig. 8, has fully shown the strengthening effect of the present invention to titanium alloy surface hardness.
Self-lubricating that is the antifriction performance test of cladding layer prepared by employing the present embodiment are as follows:
One sample is cut into the test block of 7mm × 7mm × 25mm with wire cutting machine, carries out wearing test with GCr15 steel composition friction pair, in test block, with laser cladding layer, and laser cladding layer is formed by multiple tracks cladding bar overlap joint.
The parameter of wearing test is: normal load 50N, rotating speed 200rpm, time 30min.Frictional coefficient change curve in time refers to Fig. 9, and under this test parameter, self-lubricating Ni base composite cladding layer has less frictional coefficient as seen, and frictional coefficient is in 0.2 left and right.Refer to Figure 10 and Figure 11, Figure 10 and Figure 11 are respectively the metallograph of the worn surface of TC4 alloy and self-lubricating Ni base composite cladding layer.As seen from the figure, TC4 alloy wear surface polishing scratch is dark and wide, and straight continuous, present obvious plow feature, and self-lubricating Ni base composite cladding layer wear surface is because being formed with lubricant film, and the direct contact of friction pair has been avoided in the formation of lubricant film, the frictional coefficient reducing, has also fully shown the friction reducing effect of the present embodiment to titanium alloy surface.
The self-lubricating cladding layer that adopts the present embodiment to prepare, after testing, surface quality is good, inner pore-free, hardness is: 850～950HV
0.2between, with the frictional coefficient of GCr15 steel be 0.18～0.22.
Embodiment 2:
A preparation method for laser melting coating titanium alloy surface self-lubricating coating, exists with the difference of embodiment 1:
One) material of titanium alloy base material is TC1; Remove when titanium alloy base material is fusion covers surperficial oxide film, adopt 1000# abrasive paper for metallograph to treat cladding surface and polish, then immerse in 8%NaOH solution 2 minutes.
Two) cladding material adopts Ni60 powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 95:5.The granularity of Ni60 powdered alloy is-150～+ 300 orders; Described Ni/MoS
2moS in powder
2content be 30wt.%, granularity is-200 orders.
Three) coat thickness is 2.0mm.Bake out temperature is 120 ℃, and drying time is 0.5 hour.
Four) adopt the coat on NCLT CW-1000 type YAG laser illumination titanium alloy surface, the processing parameter of laser melting coating is: laser output power P=900W, and beam flying speed V=1mm/s, spot diameter is D=2mm.In laser cladding process, adopt argon gas to protect molten bath, the flow of argon gas is 30L/min.
The present embodiment after preset cladding material, was preheating to 120 ℃ by the titanium alloy base material with coat before carrying out laser melting coating.
The self-lubricating cladding layer that adopts the present embodiment to prepare, after testing, surface quality is good, inner pore-free, hardness is: 850～1000HV
0.2, with the frictional coefficient of GCr15 steel be 0.28～0.33.
Embodiment 3:
A preparation method for laser melting coating titanium alloy surface self-lubricating coating, exists with the difference of embodiment 1:
One) material of titanium alloy base material is TC9; Remove when titanium alloy base material is fusion covers surperficial oxide film, adopt 1000# abrasive paper for metallograph to treat cladding surface and polish, then immerse in 2%NaOH solution 5 minutes.
Two) cladding material adopts Ni60 powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 75:25.The granularity of Ni60 powdered alloy is-150～+ 300 orders; Should make Ni/MoS as far as possible
2the granularity of the granularity of powder and Ni60 powdered alloy is close so that mix, at the present embodiment, and described Ni/MoS
2moS in powder
2content be 30wt.%, described Ni/MoS
2powder size is-200 orders.
Three) coat thickness: 0.6mm.Bake out temperature is 120 ℃, and drying time is 0.5 hour.
Four) adopt the coat on NCLT CW-1000 type YAG laser illumination titanium alloy surface, the processing parameter of laser melting coating is: laser output power P=850W, and beam flying speed V=4mm/s, spot diameter is D=3mm.In laser cladding process, adopt argon gas to protect molten bath, the flow of argon gas is 20L/min.
The present embodiment after preset cladding material, was preheating to 160 ℃ by the titanium alloy base material with coat before carrying out laser melting coating.
The self-lubricating cladding layer that adopts the present embodiment to prepare, after testing, surface quality is good, inner pore-free, hardness is: 800～900HV
0.2, with the frictional coefficient of GCr15 steel be 0.2～0.25.
Embodiment 4:
A preparation method for laser melting coating titanium alloy surface self-lubricating coating, exists with the difference of embodiment 1:
One) material of titanium alloy base material is TC9.
Two) cladding material adopts Ni60 powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 85:15.The granularity of Ni60 powdered alloy is-150～+ 300 orders; Described Ni/MoS
2moS in powder
2content be 30wt.%, described Ni/MoS
2the granularity of powder is+300 orders.
Three) coat thickness: 1.5mm.Bake out temperature is 160 ℃, and drying time is 0.8 hour.
Four) adopt the coat on NCLT CW-1000 type YAG laser illumination titanium alloy surface, the processing parameter of laser melting coating is: laser output power P=850W, and beam flying speed V=3mm/s, spot diameter is D=2mm.In laser cladding process, adopt argon gas to protect molten bath, the flow of argon gas is 20L/min.
The present embodiment after preset cladding material, was preheating to 160 ℃ by the titanium alloy base material with coat before carrying out laser melting coating.
Self-lubricating cladding layer prepared by the present embodiment, after testing, surface quality is good, inner pore-free, hardness is: 840～940HV
0.2, with the frictional coefficient of GCr15 steel be 0.23～0.28.
Embodiment 5:
A preparation method for laser melting coating titanium alloy surface self-lubricating coating, exists with the difference of embodiment 1: cladding material adopts Ni25 powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 50:50.
Self-lubricating cladding layer prepared by the present embodiment, after testing, surface quality is good, inner pore-free, hardness is: 800～900HV
0.2, with the frictional coefficient of GCr15 steel be 0.19～0.21.
Embodiment 6:
A preparation method for laser melting coating titanium alloy surface self-lubricating coating, exists with the difference of embodiment 2: cladding material adopts Ni35 powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 95:5.
Self-lubricating cladding layer prepared by the present embodiment, after testing, surface quality is good, inner pore-free, hardness is: 850～950HV
0.2, with the frictional coefficient of GCr15 steel be 0.28～0.35.
Embodiment 7:
A preparation method for laser melting coating titanium alloy surface self-lubricating coating, exists with the difference of embodiment 3: cladding material adopts Ni45 powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 75:25.
Self-lubricating cladding layer prepared by the present embodiment, after testing, surface quality is good, inner pore-free, hardness is: 830～935HV
0.2, with the frictional coefficient of GCr15 steel be 0.22～0.27.
Embodiment 8:
A preparation method for laser melting coating titanium alloy surface self-lubricating coating, exists with the difference of embodiment 4: cladding material adopts Ni45 powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 85:15.
Self-lubricating cladding layer prepared by the present embodiment, after testing, surface quality is good, inner pore-free, hardness is: 850～960HV
0.2, with the frictional coefficient of GCr15 steel be 0.24～0.28.
Although by reference to the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not departing from the scope situation that aim of the present invention and claim protect, can also make a lot of forms, within these all belong to protection scope of the present invention.
Claims (6)
1. a preparation method for laser melting coating titanium alloy surface self-lubricating coating, is characterized in that, comprises the following steps:
One) titanium alloy base material is fusion covers surface preparation: remove that titanium alloy base material is fusion covers surperficial oxide film;
Two) cladding material preparation: cladding material formula is NiCrBSi powdered alloy and Ni/MoS
2powder is pressed the mass ratio preparation of 50-95:5-50, and mixes;
Three) preset cladding material: first by the cladding material mixing with thering is volatile organic solvent furnishing pasty state, what be coated in titanium alloy base material treats cladding surface, coat thickness is 0.6～2.0mm, then coat is dried;
Four) laser melting coating: adopt laser illumination coat, make coat cladding on titanium alloy base material.
2. the preparation method of laser melting coating titanium alloy surface self-lubricating coating according to claim 1, is characterized in that, described Ni/MoS
2moS in powder
2content is 20～30wt.%, described Ni/MoS
2the granularity of powder is-150～+ 300 orders.
3. the preparation method of laser melting coating titanium alloy surface self-lubricating coating according to claim 1, is characterized in that, in step 4) step 3 before) afterwards, the titanium alloy base material with coat is preheating to 120～160 ℃.
4. the preparation method of laser melting coating titanium alloy surface self-lubricating coating according to claim 1, is characterized in that, in step 1) step 2 afterwards) before, treat cladding surface and carry out Passivation Treatment.
5. the preparation method of laser melting coating titanium alloy surface self-lubricating coating according to claim 1, it is characterized in that described step 4) employing YAG laser illumination coat, the output rating P=800～900W of laser apparatus, beam flying speed V=2～4mm/s, spot diameter D=1～3mm; In laser cladding process, adopt argon gas to protect molten bath, the flow of argon gas is 20～30L/min.
6. the preparation method of laser melting coating titanium alloy surface self-lubricating coating according to claim 1, is characterized in that, described titanium alloy base material is any one in TC1, TC4 and TC9.
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