CN107805807B - A kind of steam turbine sliding block and preparation method thereof based on laser melting deposition - Google Patents

A kind of steam turbine sliding block and preparation method thereof based on laser melting deposition Download PDF

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CN107805807B
CN107805807B CN201710992045.5A CN201710992045A CN107805807B CN 107805807 B CN107805807 B CN 107805807B CN 201710992045 A CN201710992045 A CN 201710992045A CN 107805807 B CN107805807 B CN 107805807B
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powder
steam turbine
sliding block
laser melting
layer
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CN107805807A (en
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史晓亮
闫昭
黄玉春
刘锡尧
邓骁斌
章桥新
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Wuhan University of Technology WUT
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    • C—CHEMISTRY; METALLURGY
    • 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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    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • C23C24/106—Coating with metal alloys or metal elements only
    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/005—Selecting particular materials

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Abstract

The invention belongs to friction material and its preparation technical field more particularly to a kind of steam turbine sliding blocks and preparation method thereof based on laser melting deposition, and the steam turbine sliding block that should be deposited based on laser melting, it includes three layers, is followed successively by Ni from bottom to top3Al base layer, Ni3Al‑WS2Fretting wear layer, WS2Adjustment layer, the Ni3Al matrix ligament thickness is 50-60mm, Ni3Al‑WS2Fretting wear layer is with a thickness of 40-50mm, WS2Adjustment layer is with a thickness of 0.24-0.48mm.Traditional steam turbine sliding block mostly uses copper-based or iron-based, but with the development of industry, steam turbine requires sliding block to work under mal-conditions in high speed, high carry etc., and copper-based, iron-based is easily oxidized under the high temperature conditions, and intensity decreases, and then causes slider wear serious.Steam turbine sliding block of the present invention not only has good mechanical performance, but also has excellent tribological property, and technological parameter is easy to control in preparation process, is suitble to promote and apply.

Description

A kind of steam turbine sliding block and preparation method thereof based on laser melting deposition
Technical field
The invention belongs to friction material and its preparation technical field more particularly to a kind of steamers based on laser melting deposition Machine sliding block and preparation method thereof.
Background technique
Steam turbine is from full-load run is started to again to during shutdown, and with the variation of load, the temperature of unit will The range for changing, and changing room temperature between 535 degree ([1] Wang Dongxi means for supporting gear box for steam engine: it is Chinese, 02222856.X[P].2003-04-30).The main shaft of steam turbine can be generated and be expanded with heat and contract with cold because of the variation of temperature, this makes it Axial length can change.When the variation of axial length, the high intermediate pressure cylinder expansion impediment of steam-turbine unit will lead to.In order to The problem of eliminating expansion impediment improves the reliability and stability of steam turbine work, and the lubrication for improving sliding key system is that extremely have (analysis of the reason of [2] Zhang Chun, Liu Zhigang .300MW steam turbine height, intermediate pressure steam cylinder halfway expansion and the improvement Ningxia [J] of meaning Electric power, 2005 (s1): 184-186.).Traditional sliding key system generally uses grease lubrication, but this lubricating system exists quantitatively Upper inaccuracy, and the disadvantage more demanding to operator quality.Sliding key system in steam turbine usually uses sliding block to be driven Mode.Compared to other mechanical drive modes, such as gear drive, the gap between sliding block and connector is smaller, usually Cooperation is crossed, is not easy to the addition of lubricating oil, lubricating grease.In addition, transition fit also be easy by lubricant grease squeeze out matching piece it Between.
In order to make lubricant grease that can preferably work in sliding block transmission system, some researchers are proposed on sliding block The solution of processing oil groove.However, oil groove can be made unsmooth since old grease is easily dry and hard, therefore it still can reduce grease In the lubricant effect in sliding block transmission system, ([3] Ma Jun speeds .Deva alloy material in the transformation of domestic 300MW unit bearing block The young scientific and technological forum of the Jiangsu Province application [C] electrical engineering, 2002.).Studies have shown that being that solution is above-mentioned using self-lubrication pad One of effective ways of problem.Mosaic self-lubricating solid sliding block is that lubricant is embedded in metallic matrix, in sliding process, The solid lubricant of insertion matrix is extruded surface under the effect of friction, and then forms one layer of solid lubrication in friction surface Film achievees the effect that lubrication.This self-lubrication pad is good and be widely used due to self-lubricating property and thermal conductivity.But it inlays Embedded material is easy to lose self-lubricating property since silt or abrasive dust cover on solid lubricant surface.In addition, because solid Lubricant is in insertion metallic matrix, so the mechanical strength of sliding block will can decrease.It is available from documents and materials, it is this The mechanical performance of material can not fully meet the service requirement of steam turbine under some severe operating conditions, and ([4] Yang Zhijie, Pan are small Application [J] Central China electric power of the peaceful .FZ series self-lubricating material on the regulating ring of wicket gate of power station, 2004,17 (6): 56-58.).
Traditional steam turbine sliding block mostly uses copper-based or iron-based, but with the development of industry, steam turbine requires sliding block in height Speed, high carry etc. work under mal-conditions, and it is copper-based, iron-based be easily oxidized under the high temperature conditions, and intensity decreases, and then leads Cause slider wear serious.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of based on sharp in view of the deficiency of the prior art Steam turbine sliding block of light fusion sediment and preparation method thereof, gained steam turbine sliding block have good mechanical performance and excellent rub It wipes and learns performance.In addition, technological parameter is easy to control in preparation process, it is suitble to promote and apply.
The present invention be solve the problems, such as it is set forth above used by technical solution are as follows:
A kind of steam turbine sliding block based on laser melting deposition, it is characterised in that: the steam turbine sliding block includes three layers, the bottom of from Portion is followed successively by Ni to top3Al base layer, Ni3Al-WS2Fretting wear layer, WS2Adjustment layer, the Ni3Al matrix ligament thickness is 50-60mm、Ni3Al-WS2Fretting wear layer is with a thickness of 40-50mm, WS2Adjustment layer is with a thickness of 0.24-0.48mm.
In above scheme, the base layer of the steam turbine sliding block is by Ni3Al pre-alloyed powder is deposited through laser melting. Ni3Al pre-alloyed powder be using Ni powder and Al powder as raw material through mixed melting, atomization and after solidifying, drying spherical metal powder End.It is prepared, the molar ratio of Ni powder and Al powder is 3:1.
In above scheme, the fretting wear layer of the steam turbine sliding block is by Ni3Al-WS2Pre-alloyed powder is heavy through laser melting Product forms.Ni3Al-WS2Pre-alloyed powder is with Ni powder, Al powder and WS2Powder is raw material through melting, atomization and must after solidifying, dry Spherical metal powder.Wherein, the molar ratio of Ni powder and Al powder is 3:1, WS2Additive amount be Ni powder and Al powder gross mass 15-25%.
In above scheme, the adjustment layer of the steam turbine sliding block is by WS2Pre-alloyed powder is deposited through laser melting.WS2 Pre-alloyed powder is with pure WS2Powder be raw material through melting, atomization and must be spherical after solidifying, dry metal powder.
The preparation method of the above-mentioned steam turbine sliding block based on laser melting deposition, includes the following steps:
1) Ni is pressed3Al base layer, Ni3Al-WS2Fretting wear layer, WS2The constitutive material of adjustment layer prepares accordingly respectively Ni3Al、Ni3Al-WS2、WS2Prealloy spherical powder, individual particle diameter is in 100-120 μ m；
3) by gained Ni3Al、Ni3Al-WS2、WS2Prealloy spherical powder passes sequentially through increasing material manufacturing equipment and carries out laser Fusion sediment is to get the steam turbine sliding block based on laser melting deposition.
Laser melting deposits in step 3) in above scheme are as follows: for 800-1000W, sweep speed is the laser power used 0.9-1.1m/min, powder feeding rate are 30-40g/min, Scan slice thickness 0.10-0.12mm, Ni3Al matrix ligament thickness is 50- 60mm、Ni3Al-WS2Fretting wear layer is with a thickness of 40-50mm, WS2Adjustment layer carries out layer-by-layer laser with a thickness of 0.24-0.48mm Melt-processed.
There is good mechanical performance and excellent tribological property according to the resulting steam turbine sliding block of above scheme, rub Wiping coefficient average value is 0.12-0.15.
Compared with prior art, the invention has the benefit that
1) present invention is by introducing Ni in steam turbine sliding block3Al base layer, makes Ni3Al base layer is when steam turbine works Load is born, changes basis material into Ni from traditional copper and iron matrix3Al matrix further improves the intensity of sliding block, makes it It can remain to work normally under the operating condition of high load.Further, since Ni3Al belongs to high temperature alloy, thus, it is sliding to have widened steam turbine The use temperature of block.
2) present invention is by changing lubricant into tungsten disulfide from traditional graphite, so that steam turbine sliding block is being higher than 400 Degree still has good self-lubricating property.In addition, Ni3Al-WS2Fretting wear layer is no longer original embedded structure, is avoided Inserted material is easy solid lubricant surface to be covered and lost due to silt or abrasive dust the deficiency of self-lubricating property, makes vapour The holding of the self-lubricating property energy continuous and effective of turbine sliding block.
3) present invention is by introducing WS in steam turbine sliding block2Adjustment layer avoids steam turbine sliding block in the running-in stage, Gu Body lubricant is not caused the defect of inferior frictional behaviour by timely expression surface.
4) present invention prepares steam turbine sliding block using laser melting deposition technique.Due to laser melting deposition be one layer by layer Accumulation technology, so, when carrying out one layer of deposition, next layer and several layers still have complicated temperature gradient, this also means that: it is every One layer need to undergo and melt for several times, solidify, is remelted, the process that solidifies again, thus may insure steam turbine sliding block layer and layer it Between be completely embedded.Moreover, preparation method of the present invention is simple, technological parameter is easy to control and feasibility is high；And it is related to Raw material cost is low, from a wealth of sources, and required equipment cost is lower, energy conservation and environmental protection, and scale is suitble to be widely applied.
Detailed description of the invention
Fig. 1 is the function gradient structure schematic diagram of steam turbine sliding block of the present invention.
Fig. 2 is the limit stress figure of steam turbine sliding block obtained by 1-3 of the embodiment of the present invention.
Fig. 3 be 1-3 of the embodiment of the present invention when test temperature is 550 degree obtained by steam turbine sliding block coefficient of friction figure.
Fig. 4 be 1-3 of the embodiment of the present invention when test temperature is 550 degree obtained by steam turbine sliding block dynamic friction coefficient Scheme
Specific embodiment
Further the present invention will be described with reference to the accompanying drawings and embodiments, but the contents of the present invention are not limited solely to The following examples.
In the present invention, according to a certain ratio by vibration mixing, high-temperature fusion, the technology of rotating circular disk atomization, respectively Prepare the Ni that sphericity is high, powder size is thin, with high purity3Al、Ni3Al-WS2、WS2Prealloy spherical powder；Then, it utilizes The method of laser melting deposition prepares a kind of three with good physical mechanical performance and excellent tribology performance layer special layers The steam turbine sliding block of unit.Wherein, vibration frequency that the process conditions of method for mixing use is vibrated for 30-40Hz, and vibration force is 9000-10000N, duration of oscillation 25-35min, and carry out high-temperature fusion and obtain corresponding molten alloy liquid；Gained is melted and is closed Golden liquid is placed in atomising device progress rotating circular disk atomization, it is to be condensed solidify and dries after must be spherical metal powder, and sieve The metal powder that the diameter of individual particle is 100-120 μm, can obtain corresponding Ni3Al、Ni3Al-WS2、WS2Prealloy spherical powder End.
In following embodiment, the laser melting depositing device used is 3DTALK-Fab460 type laser melting processing machine.
Embodiment 1
A kind of steam turbine sliding block based on laser melting deposition, preparation method include the following steps:
It 1) is Ni with Ni powder 236g and Al powder 36g3Al base layer raw material, with Ni powder 236g, Al powder 36g and WS2Powder 40.8g For Ni3Al-WS2Fretting wear layer raw material, with WS2Powder 8.16g is WS2Adjustment layer raw material；Wherein, the molar ratio of Ni powder and Al powder For 3:1, WS2Powder is in Ni3Al-WS2The additive amount of fretting wear layer is the 15.0% of Ni powder and Al powder gross mass；
2) by weighed Ni3Al base layer raw material, Ni3Al-WS2Fretting wear layer raw material, WS2Adjustment layer raw material is set respectively In carrying out vibration mixing in vibration batch mixer, the vibration frequency used is 30Hz, vibration force 9000N, and duration of oscillation is 35 points Uniformly mixed powder is passed through high temperature melting furnace after raw material is sufficiently mixed uniformly by clock respectively, and the melting for obtaining equivalent layer is closed Golden liquid；
3) the molten alloy liquid of equivalent layer is placed in progress rotating circular disk atomization in atomising device respectively, solidification to be condensed is simultaneously The metal powder that the diameter for obtaining spherical metal powder after drying, and sieving individual particle is 100-120 μm, can obtain accordingly Ni3Al、Ni3Al-WS2、WS2Prealloy spherical powder；
4) respectively by gained Ni3Al、Ni3Al-WS2、WS2Prealloy spherical powder passes sequentially through the progress of increasing material manufacturing equipment Laser melting deposition, wherein laser power 800W, sweep speed 0.9m/min, powder feeding rate are 30g/min, Scan slice thickness For 0.10mm, Ni3Al matrix ligament thickness is 50mm, Ni3Al-WS2Fretting wear layer is with a thickness of 50mm, WS2Adjustment layer with a thickness of 0.24mm carries out layer-by-layer laser melting processing, up to the steam turbine sliding block after the solidification of the last layer molten liquid.
Embodiment 1, resulting steam turbine sliding block have good mechanical performance and excellent tribological property.The present invention is logical It crosses and introduces Ni in steam turbine sliding block3Al base layer can improve limit stress to 334Mpa, can be in the operating condition of high load Under remain to work normally, as shown in Figure 2；By changing lubricant into tungsten disulfide from traditional graphite, steam turbine sliding block is widened Use temperature to 550 degree, coefficient of friction average value of steam turbine sliding block under the conditions of 550 degree is 0.15, as shown in Figure 3；It is logical It crosses and introduces WS in steam turbine sliding block2Running-in layer avoids steam turbine sliding block in the running-in stage, opens steam turbine sliding block from work Begin that just there is preferable tribological property, as shown in Figure 4.
Embodiment 2
A kind of steam turbine sliding block based on laser melting deposition, preparation method include the following steps:
It 1) is Ni with Ni powder 236g and Al powder 36g3Al base layer raw material, with Ni powder 236g, Al powder 36g and WS2Powder 54.4g For Ni3Al-WS2Fretting wear layer raw material, with WS2Powder 8.16g is WS2Adjustment layer raw material；Wherein, the molar ratio of Ni powder and Al powder For 3:1, WS2Powder is in Ni3Al-WS2The additive amount of fretting wear layer is the 20.0% of Ni powder and Al powder gross mass；
2) by weighed Ni3Al base layer raw material, Ni3Al-WS2Fretting wear layer raw material, WS2Adjustment layer raw material is set respectively In carrying out vibration mixing in vibration batch mixer, the vibration frequency used is 35Hz, vibration force 9500N, and duration of oscillation is 30 points Uniformly mixed powder is passed through high temperature melting furnace after raw material is sufficiently mixed uniformly by clock respectively, and the melting for obtaining equivalent layer is closed Golden liquid；
3) the molten alloy liquid of equivalent layer is placed in progress rotating circular disk atomization in atomising device respectively, solidification to be condensed is simultaneously The metal powder that the diameter for obtaining spherical metal powder after drying, and sieving individual particle is 100-120 μm, can obtain accordingly Ni3Al、Ni3Al-WS2、WS2Prealloy spherical powder；
4) respectively by gained Ni3Al、Ni3Al-WS2、WS2Prealloy spherical powder passes sequentially through the progress of increasing material manufacturing equipment Laser melting deposition, wherein laser power 900W, sweep speed 1.0m/min, powder feeding rate are 35g/min, Scan slice thickness For 0.11mm, Ni3Al matrix ligament thickness is 55mm, Ni3Al-WS2Fretting wear layer is with a thickness of 45mm, WS2Adjustment layer with a thickness of 0.26mm carries out layer-by-layer laser melting processing, up to the steam turbine sliding block after the solidification of the last layer molten liquid.
Embodiment 2, resulting steam turbine sliding block have good mechanical performance and excellent tribological property.The present invention is logical It crosses and introduces Ni in steam turbine sliding block3Al base layer can improve limit stress to 345Mpa, can be in the operating condition of high load Under remain to work normally, as shown in Figure 2；By changing lubricant into tungsten disulfide from traditional graphite, steam turbine sliding block is widened Use temperature to 550 degree, coefficient of friction average value of steam turbine sliding block under the conditions of 550 degree is 0.12, as shown in Figure 3；It is logical It crosses and introduces WS in steam turbine sliding block2Running-in layer avoids steam turbine sliding block in the running-in stage, opens steam turbine sliding block from work Begin that just there is preferable tribological property, as shown in Figure 4.
Embodiment 3
A kind of preparation of the steam turbine sliding block based on laser melting deposition, preparation method include the following steps:
It 1) is Ni with Ni powder 236g and Al powder 36g3Al base layer raw material, with Ni powder 236g, Al powder 36g and WS2Powder 68.0g For Ni3Al-WS2Fretting wear layer raw material, with WS2Powder 8.16g is WS2Adjustment layer raw material；Wherein, the molar ratio of Ni powder and Al powder For 3:1, WS2Powder is in Ni3Al-WS2The additive amount of fretting wear layer is the 25.0% of Ni powder and Al powder gross mass；
2) by weighed Ni3Al base layer raw material, Ni3Al-WS2Fretting wear layer raw material, WS2Adjustment layer raw material is set respectively In carrying out vibration mixing in vibration batch mixer, the vibration frequency used is 40Hz, vibration force 10000N, and duration of oscillation is 25 points Uniformly mixed powder is passed through high temperature melting furnace after raw material is sufficiently mixed uniformly by clock respectively, and the melting for obtaining equivalent layer is closed Golden liquid；
3) the molten alloy liquid of equivalent layer is placed in progress rotating circular disk atomization in atomising device respectively, solidification to be condensed is simultaneously The metal powder that the diameter for obtaining spherical metal powder after drying, and sieving individual particle is 100-120 μm, can obtain accordingly Ni3Al、Ni3Al-WS2、WS2Prealloy spherical powder；
4) respectively by gained Ni3Al、Ni3Al-WS2、WS2Prealloy spherical powder passes sequentially through the progress of increasing material manufacturing equipment Laser melting deposition, wherein laser power 1000W, sweep speed 1.1m/min, powder feeding rate are 40g/min, Scan slice thickness For 0.12mm, Ni3Al matrix ligament thickness is 60mm, Ni3Al-WS2Fretting wear layer is with a thickness of 40mm, WS2Adjustment layer with a thickness of 0.28mm carries out layer-by-layer laser melting processing, up to the steam turbine sliding block after the solidification of the last layer molten liquid.
Embodiment 3, resulting steam turbine sliding block have good mechanical performance and excellent tribological property.The present invention is logical It crosses and introduces Ni in steam turbine sliding block3Al base layer can improve limit stress to 330Mpa, can be in the operating condition of high load Under remain to work normally, as shown in Figure 2；By changing lubricant into tungsten disulfide from traditional graphite, steam turbine sliding block is widened Use temperature to 550 degree, coefficient of friction average value of steam turbine sliding block under the conditions of 550 degree is 0.13, as shown in Figure 3；It is logical It crosses and introduces WS in steam turbine sliding block2Running-in layer avoids steam turbine sliding block in the running-in stage, opens steam turbine sliding block from work Begin that just there is preferable tribological property, as shown in Figure 4.
The above is only a preferred embodiment of the present invention, it is noted that come for those of ordinary skill in the art It says, without departing from the concept of the premise of the invention, several modifications and variations can also be made, these belong to of the invention Protection scope.

Claims (10)

1. a kind of steam turbine sliding block based on laser melting deposition, which is characterized in that it includes three layers, from bottom to top successively For Ni3Al base layer, Ni3Al-WS2Fretting wear layer, WS2Adjustment layer, the Ni3Al matrix ligament thickness be 50-60 mm, Ni3Al-WS2Fretting wear layer is with a thickness of 40-50 mm, WS2Adjustment layer is with a thickness of 0.24-0.48 mm；
For the laser power that laser melting deposition uses for 800-1000 W, sweep speed is 0.9-1.1 m/min, and powder feeding rate is 30-40 g/min, Scan slice thickness are 0.10-0.12 mm, Ni3Al matrix ligament thickness is 50-60 mm, Ni3Al-WS2Fretting wear Layer is with a thickness of 40-50 mm, WS2Adjustment layer carries out layer-by-layer laser melting processing with a thickness of 0.24-0.48 mm.
2. a kind of steam turbine sliding block based on laser melting deposition according to claim 1, which is characterized in that its friction Coefficient average value is 0.12-0.15.
3. a kind of steam turbine sliding block based on laser melting deposition according to claim 1, which is characterized in that the Ni3Al Base layer is by Ni3Al pre-alloyed powder is deposited through laser melting.
4. a kind of steam turbine sliding block based on laser melting deposition according to claim 3, which is characterized in that the Ni3Al Pre-alloyed powder be using Ni powder and Al powder as raw material 3:1 mixing in molar ratio after, through melting, atomization and obtain ball after solidifying, dry The metal powder of shape.
5. a kind of steam turbine sliding block based on laser melting deposition according to claim 1, which is characterized in that described Ni3Al-WS2Fretting wear layer is by Ni3Al-WS2Pre-alloyed powder is deposited through laser melting.
6. a kind of steam turbine sliding block based on laser melting deposition according to claim 5, which is characterized in that described Ni3Al-WS2Pre-alloyed powder is with Ni powder, Al powder and WS2Powder is raw material, through mixed melting, atomization and after solidifying, drying ball The metal powder of shape；Wherein, the molar ratio of Ni powder and Al powder is 3:1, WS2The additive amount of powder is Ni powder and Al powder gross mass 15-25%。
7. a kind of steam turbine sliding block based on laser melting deposition according to claim 1, which is characterized in that the WS2Mill Layer is closed by WS2Pre-alloyed powder is deposited through laser melting.
8. a kind of steam turbine sliding block based on laser melting deposition according to claim 7, which is characterized in that the WS2In advance Alloy powder is with WS2Powder be raw material through melting, atomization and must be spherical after solidifying, dry metal powder.
9. a kind of preparation method of steam turbine sliding block based on laser melting deposition as described in claim 1, which is characterized in that Include the following steps:
1) according to Ni3Al base layer, Ni3Al-WS2Fretting wear layer, WS2Adjustment layer chooses corresponding Ni respectively3Al、Ni3Al- WS2、WS2Prealloy spherical powder；Ni3Al、Ni3Al-WS2、WS2The individual particle diameter of prealloy spherical powder is 100-120 μ m；
2) by gained Ni3Al、Ni3Al-WS2、WS2It is heavy that prealloy spherical powder passes sequentially through increasing material manufacturing equipment progress laser melting Product is to get the steam turbine sliding block based on laser melting deposition.
10. a kind of preparation method of steam turbine sliding block based on laser melting deposition according to claim 9, feature exist In for the laser power that laser melting deposition uses in step 2 for 800-1000 W, sweep speed is 0.9-1.1 m/min, is sent Powder rate is 30-40 g/min, and Scan slice thickness is 0.10-0.12 mm, Ni3Al matrix ligament thickness is 50-60 mm, Ni3Al-WS2It rubs Wiping Wear layer thickness is 40-50 mm, WS2Adjustment layer carries out layer-by-layer laser melting processing with a thickness of 0.24-0.48 mm.
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