CN103361642A - Plasma cladding gradient wear-resistant layer and preparation process thereof - Google Patents
Plasma cladding gradient wear-resistant layer and preparation process thereof Download PDFInfo
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- 238000005253 cladding Methods 0.000 title claims abstract description 147
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 230000007797 corrosion Effects 0.000 claims abstract description 6
- 238000005260 corrosion Methods 0.000 claims abstract description 6
- 239000003245 coal Substances 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 32
- 229910052804 chromium Inorganic materials 0.000 claims description 19
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 229910052759 nickel Inorganic materials 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 229910052748 manganese Inorganic materials 0.000 claims description 12
- 239000011159 matrix material Substances 0.000 claims description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 238000005275 alloying Methods 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 239000000470 constituent Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 229910003470 tongbaite Inorganic materials 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000000919 ceramic Substances 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract description 2
- 230000004927 fusion Effects 0.000 abstract 1
- 238000005065 mining Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 5
- 238000007750 plasma spraying Methods 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- LNSPFAOULBTYBI-UHFFFAOYSA-N [O].C#C Chemical group [O].C#C LNSPFAOULBTYBI-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
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Abstract
A plasma cladding gradient wear-resistant layer and a preparation process belong to the preparation process of the wear-resistant layer. Preparing a gradient wear-resistant cladding layer on the surface of a substrate by using an inner cladding layer and outer cladding layer alloy powder by using a plasma cladding technology to obtain a wear-resistant, corrosion-resistant and impact-resistant sliding shoe wear-resistant layer of the coal mining machine; the preparation process comprises the following steps: (1) pre-treating a substrate before plasma cladding; (2) pretreating iron-based metallurgical powder before plasma cladding; (3) preparing an inner cladding layer; (4) and preparing an outer cladding layer. The plasma cladding gradient wear-resistant layer realizes gradient change of a metallographic structure from the surface of the outer cladding layer to a fusion line, the gradient cladding layer has the advantages that a single cladding layer cannot match, the optimal performance of the ceramic cladding layer and a metallurgical substrate is matched, the distribution curve of the hardness of the ceramic cladding layer from the outer cladding layer to a heat affected zone of the substrate is slowly reduced in a step shape, the surface hardness is improved, the change trend of the friction coefficient is mild, the abrasion loss is low, and the corrosion resistance and the impact resistance are greatly improved.
Description
Technical field
The present invention relates to a kind of wearing layer and preparation technology thereof, particularly a kind of plasma cladding gradient wear resistant layer and preparation technology.
Background technology
Piston shoes are support components of coalcutter, are divided into supporting piston shoes and guide slip shoe.The effect of supporting piston shoes mainly plays a supportive role, and guide slip shoe is not only played a supporting role, and coalcutter is advanced along track, works to offset the side force of rib.Piston shoes should bear the own wt of coalcutter, bear again very large friction resistance.Therefore, piston shoes are a kind of low-speed heave-loads that bear on the coalcutter base, and wear resistance is required high vitals.In view of the coalcutter work under bad environment, stressed complexity, and the coalcutter installed power is increasing, and its weight is also more and more heavier, and is also more and more stricter to the requirement of piston shoes.
According to work characteristics and the Working environment of coalcutter, its employed piston shoes material requirements has higher hardness and intensity, good toughness and higher wear resistance and solidity to corrosion.The material that is applied at present piston shoes generally has the materials such as 42CrMo, ZG40Cr, 18Cr2Ni4W.ZG40Cr is through quench treatment, because the fault in material that cast steel has, it can only be used for some underloads; The intensity of 42CrMo material is higher than ZG40Cr intensity, but its wear resistance does not satisfy the requirement of high-power coal cutter; Although and the 18Cr2Ni4W better performances is higher with piston shoes material cost and the processing cost of this material monolithic making owing to the adding of precious alloy element, its cementation zone is thinner in addition, has shortcoming frangible under the weight.Therefore, if adopt higher, the lower-cost material of intensity as the load-bearing matrix of slipper of coal producer, then can address this problem at its surface controlled wearing layer of preparation a layer thickness.In modern production, the top coat technology that extensively adopts has flame plating, electric arc spraying, detonation flame spraying, built-up welding, oxygen-acetylene torch surfacing, plasma melting coating technique, electron beam cladding technology etc.
The plasma melting coating technique is the process for treating surface that development in recent years is got up, the intergranular bonding strength of cladding layer mainly is metallurgical binding in the plasma melting coating technique, bonding strength is higher, and this technology has all adopted the PLC circuit control system, easy handling, equipment price and work condition environment are less demanding.At present, have the scholar adopt the plasma melting coating technique workpiece surface obtained fine microstructures, densification, evenly, pore-free, flawless cladding layer; But the bi-material combination is at the interface, because stress concentration can appear in performance difference, and then the phenomenon that crackle occurs and peel off.
Summary of the invention
The present invention seeks to provide a kind of plasma cladding gradient wear resistant layer and preparation technology, the wearing layer of this technique preparation resistance to wears, corrosion-resistant, shock-resistant.
The technical scheme that realizes the object of the invention is as follows: utilize the plasma melting coating technique, cladding layer and outer cladding layer powdered alloy in adopting prepare the wear-resisting cladding layer of gradient at matrix surface, and acquisition is resistance to worn, corrosion-resistant and impact-resistant slipper of coal producer;
Described interior cladding layer alloying constituent is, by mass percentage: Si:2%～3%, Mn:1%～2%, Al:0.5%～1%, Mo:0.5%～1.5%, Ni:3%～5%, Cr
3C
2: 30%～40%, surplus is Fe; Described outer cladding layer alloying constituent is, by mass percentage: Si:2%～3%, Mn:1%～2%, Al:0.5%～1%, Mo:0.5%～1.5%, Ni:3%～5%, Cr
3C
2: 40%～50%, surplus is Fe.
The preparation technology of plasma cladding gradient wear resistant layer comprises the steps:
(1) substrate pretreatment before the plasma cladding:
Select trieline or carbon tetrachloride solvent to dispose impurity and the greasy dirt of substrate surface, before plasma cladding, substrate carried out 140 ℃ preheating;
(2) iron-based metallurgical powder pre-treatment before the plasma cladding:
Powder second is sieved, adopt by first sieve in the batching and stay second grade powder on the sieve, its size is distributed in 80～100 orders, and the form of powder is sphere or class is spherical; Carry out drying under 150 ℃ of temperature in loft drier, the powder that is dried is packed in the dish, evenly is tiled under the said temperature to keep 3 hours, will be stirred powder in the drying process; Use the ball mill batch mixing, the filling amount of mixer is no more than 1/3 of its volume;
(3) preparation of interior cladding layer:
Interior cladding layer alloying constituent is, by mass percentage: Si:2%～3%, Mn:1%～2%, Al:0.5%～1%, Mo:0.5%～1.5%, Ni:3%～5%, Cr
3C
2: 30%～40%, surplus is Fe;
Difference according to the cladding powder composition that uses and cladding layer capability requirement, the processing parameter (such as working current, operating voltage and sweep velocity etc.) that adopts in the selected plasma cladding, by analyzing in advance matrix and cladding material, and do correlation test, determine that the processing parameter of cladding layer in the best preparation is as follows:
Plasma (orifice) gas is argon gas, working current 120-125A, operating voltage 17-17.5V, shield gas flow rate 1.2m
3/ h, electric power gas flow 0.8m
3/ h, nozzle is apart from surface distance 10mm, sweep velocity 180-190mm/min.
(4) preparation of outer cladding layer:
In order to guarantee that outer cladding layer is better than interior cladding layer, the transition on the performance is arranged, there is the cooling of interior cladding layer sample on the surface after, polishing and cut sample in the surface, guarantees the cladding layer consistency of thickness, cleaning surfaces; Carry out the cladding second time on the cladding layer surface, outer cladding layer alloying constituent is, by mass percentage: Si:2%～3%, Mn:1%～2%, Al:0.5%～1%, Mo:0.5%～1.5%, Ni:3%～5%, Cr
3C
2: 40%～50%, surplus is Fe, the interior cladding layer content of Cr3C2 content exceeds 10%～20% in its China and foreign countries' cladding layer;
Outer cladding layer plasma cladding processing parameter is as follows:
Plasma (orifice) gas is argon gas, working current 100-127A, operating voltage 16.9-21V, shield gas flow rate 1.2m
3/ h, electric power gas flow 0.8m
3/ h, nozzle is apart from surface distance 10mm, sweep velocity 190-200mm/min.
Advantage of the present invention and beneficial effect are: adopt above-mentioned technical scheme, the plasma cladding gradient wear resistant layer has realized the graded of metallographic structure from outer cladding layer surface to welded bonds, the gradient cladding layer has the incomparable advantage of single cladding layer, be particularly suitable for the optimum performance coupling between ceramic cladding layer and metallurgical matrix, its hardness is from outer cladding layer to the stepped slow decreasing of the distribution curve of matrix heat affected zone, surface hardness improves, under the large environment of high temperature or difference variation, can slow down or change thermal stresses sudden change and distribution, obtain high wear-resisting of bonding force, heat-resisting cladding layer, thereby preventing layer is peeled off effectively, the frictional coefficient variation tendency is mild, abrasion loss is low, erosion resistance, impact resistance improves greatly.
Description of drawings
Fig. 1 is the XRD figure spectrum of interior cladding layer in the plasma cladding gradient wear resistant layer of the present invention.
Fig. 2 is the metallographic structure figure of the interior cladding layer of the present invention and matrix bonding interface.
Fig. 3 is the metallographic structure figure at the interior cladding layer of the present invention and outer cladding layer interface.
Fig. 4 is that wearing layer of the present invention is from the cladding layer surface until the substrate hardness distribution of heat affected zone not.
Fig. 5 is the cross-sectional morphology of plasma cladding gradient wear resistant layer of the present invention under 100 cycle circulation impacts.
Fig. 6 is that plasma cladding gradient wear resistant layer of the present invention is 1 * 10
5Cross-sectional morphology under the cycle circulation impact.
Embodiment
Above content part of the present invention has been done sufficient explanation to the present invention, below in conjunction with the drawings and specific embodiments the present invention is described in further details, and present embodiment only is best mode for carrying out the invention, is not limitation of the invention.
Embodiment 1:
Cladding layer composition (% by weight) is as follows in the plasma cladding gradient wear resistant layer:
Si:2%, Mn:2%, Al:1%, Mo:0.5%, Ni:4%, Cr
3C
2: 30%, surplus is Fe.
The outer cladding layer composition (% by weight) of plasma cladding gradient wear resistant layer is as follows:
Si:2%, Mn:2%, Al:1%, Mo:0.5%, Ni:4%, Cr
3C
2: 40%, surplus is Fe.
This gradient wear resistant layer prepares as follows:
At first for guaranteeing the plasma cladding effect, use trieline to dispose impurity and the greasy dirt on matrix (#45 steel) surface, matrix is carried out 140 ℃ of preheatings.By crossing sieve method and microscopic observation method each composition powder is screened, size is distributed in 80～100 orders, for increasing the fluency of powder feeding, powder morphology is controlled at sphere or class is spherical, then loft drier is put in the even tiling of each composition powder and carried out drying, temperature is controlled at 150 ℃, in the drying process powder is stirred.Use ball mill that each composition powder is mixed, mixing time 1h, filling amount are no more than 1/3 of ball grinder volume.Use the PLC plasma spraying welding equipment to prepare cladding layer, during the interior cladding layer of preparation, select argon gas as plasma (orifice) gas, working current 120A, operating voltage 17.5V, shield gas flow rate 1.2m
3/ h, electric power gas flow 0.8m
3/ h, nozzle is apart from surface distance 10mm, sweep velocity 190mm/min.Polished and cut sample in the cladding rear surface, guarantee the cladding layer consistency of thickness, cleaning surfaces carries out the cladding second time on the cladding layer surface, and outer cladding layer powder composition as previously mentioned.The same outer cladding layer of PLC plasma spraying welding equipment preparation that uses, selected argon gas is plasma (orifice) gas, working current 100A, operating voltage 21V, shield gas flow rate 1.2m
3/ h, electric power gas flow 0.8m
3/ h, nozzle is apart from surface distance 10mm, sweep velocity 200mm/min.
Embodiment 2:
Cladding layer composition (% by weight) is as follows in the plasma cladding gradient wear resistant layer:
Si:2%, Mn:2%, Al:1%, Mo:0.5%, Ni:4%, Cr
3C
2: 30%, surplus is Fe.
The outer cladding layer composition (% by weight) of plasma cladding gradient wear resistant layer is as follows:
Si:2%, Mn:2%, Al:1%, Mo:0.5%, Ni:4%, Cr
3C
2: 50%, surplus is Fe.
Use the interior cladding layer processing parameter of PLC plasma spraying welding equipment preparation as follows:
Plasma (orifice) gas: argon gas, working current: 120A, operating voltage: 17.5V, shield gas flow rate: 1.2m
3/ h, electric power gas flow: 0.8m
3/ h, nozzle are apart from surface distance: 10mm, sweep velocity: 190mm/min.
Use the outer cladding layer processing parameter of PLC plasma spraying welding equipment preparation as follows:
Plasma (orifice) gas: argon gas, working current: 127A, operating voltage: 16.9V, shield gas flow rate: 1.2m
3/ h, electric power gas flow: 0.8m
3/ h, nozzle are apart from surface distance: 10mm, sweep velocity: 190mm/min.
Preparation method and example 1 are together.
Fig. 1 is the XRD figure spectrum of interior cladding layer in the example 1 plasma cladding gradient wear resistant layer, contains AlFe, (Fe, Cr) in the cladding layer
7C
3, the phase such as austenite Fe (Cr, Ni).(Fe, Cr)
7C
3Content also higher, this is because under the plasma cladding high temperature action, the element solid solutions such as Fe, Cr, C, Ni, Al are in γ-Fe, part alloy carbide is because Fe, the elements such as Cr and C element are in hypersaturated state, constantly separating out and forming from crystal boundary in the process of cooling afterwards, another small portion is because some molten alloying elements at high temperature directly form.
Fig. 2 is the metallographic structure figure of example 1 interior cladding layer and matrix bonding interface, the cladding layer metallographic structure presents very uniformly dentrite, and crystal boundary is very orderly, without obvious hole, between cladding layer and the substrate transition good, reach metallurgical binding, cladding layer partly presents the brilliant tissue in plane, owing to contain certain C r element, present at the interface white light tone, i.e. " white band ".
Fig. 3 is the metallographic structure figure at example 1 interior cladding layer and outer cladding layer interface, contains a large amount of intermetallic compounds in the outer microstructure of surface cladding layer, comprising (Fe, Cr)
7C
3Hexagonal structure, and dense structure is even, do not find " bright layer " between individual layer cladding layer and the matrix between outer cladding layer and the interior cladding layer, when showing the outer cladding layer of cladding, interior cladding layer fusing, and the thermograde of bonding interface reduces, and the solidified structure growth rate is accelerated, and does not form the plane crystalline substance.And outer cladding layer bottom organize very tiny, and the dentrite smooth transition of interior cladding layer, the substrate of organizing of outer cladding layer is (Fe, Cr) austenite, carbide also disperse is distributed in around the substrate, forms wear-resisting skeleton in cladding layer.
Fig. 4 be example 2 wearing layers from the cladding layer surface until the substrate hardness distribution of heat affected zone not, hardness is up to 735HV
0.1, be about 4～5 times of substrate hardness, and whole Hardness Distribution curve has obvious graded at interior cladding layer place.
Fig. 5 is the cross-sectional morphologies of example 2 plasma cladding gradient wear resistant layer under 100 cycle circulation impacts, and cross section presents intact pattern, and obvious viscous deformation does not only occur, and the gradient bonding interface also has no and separates and crack initiation.
Fig. 6 is that example 2 plasma cladding gradient wear resistant layer are 1 * 10
5Cross-sectional morphology under the cycle circulation impact, cross-sectional deformation is lighter, only having has crackle to generate between interior cladding layer and the outer cladding layer, and outwards cladding layer spreads, the performance of the bonding interface of interior cladding layer and substrate is good, generate without obvious fatigue cracking, by substrate deformation district visible material under the effect of surging force, in the extruding of grain boundaries generation stratiform, but without crackle as seen.
Claims (2)
1. the body material of a plasma cladding gradient wear resistant layer: it is characterized in that: the plasma cladding material comprises interior cladding layer and outer cladding layer powdered alloy;
Described interior cladding layer alloying constituent is, by mass percentage: Si:2%～3%, Mn:1%～2%, Al:0.5%～1%, Mo:0.5%～1.5%, Ni:3%～5%, Cr
3C
2: 30%～40%, surplus is Fe; Described outer cladding layer alloying constituent is, by mass percentage: Si:2%～3%, Mn:1%～2%, Al:0.5%～1%, Mo:0.5%～1.5%, Ni:3%～5%, Cr
3C
2: 40%～50%, surplus is Fe.
2. preparation technology who adopts plasma cladding gradient wear resistant layer body material claimed in claim 1, it is characterized in that: utilize the plasma melting coating technique, cladding layer and outer cladding layer powdered alloy in adopting, prepare the wear-resisting cladding layer of gradient at matrix surface, acquisition is resistance to worn, corrosion-resistant and impact-resistant slipper of coal producer wearing layer; The preparation technology of plasma cladding gradient wear resistant layer comprises the steps:
(1) substrate pretreatment before the plasma cladding:
Select trieline or carbon tetrachloride solvent to dispose impurity and the greasy dirt of substrate surface, before plasma cladding, substrate carried out 140 ℃ preheating;
(2) iron-based metallurgical powder pre-treatment before the plasma cladding:
Powder second is sieved, adopt by first sieve in the batching and stay second grade powder on the sieve, its size is distributed in 80～100 orders, and the form of powder is sphere or class is spherical; Carry out drying under 150 ℃ of temperature in loft drier, the powder that is dried is packed in the dish, evenly is tiled under the said temperature to keep 3 hours, will be stirred powder in the drying process; Use the ball mill batch mixing, the filling amount of mixer is no more than 1/3 of its volume;
(3) preparation of interior cladding layer:
Interior cladding layer alloying constituent is, by mass percentage: Si:2%～3%, Mn:1%～2%, Al:0.5%～1%, Mo:0.5%～1.5%, Ni:3%～5%, Cr
3C
2: 30%～40%, surplus is Fe;
Difference according to the cladding powder composition that uses and cladding layer capability requirement, the processing parameter (such as working current, operating voltage and sweep velocity etc.) that adopts in the selected plasma cladding, by analyzing in advance matrix and cladding material, and do correlation test, determine that the processing parameter of cladding layer in the best preparation is as follows:
Plasma (orifice) gas is argon gas, working current 120-125A, operating voltage 17-17.5V, shield gas flow rate 1.2m
3/ h, electric power gas flow 0.8m
3/ h, nozzle is apart from surface distance 10mm, sweep velocity 180-190mm/min.
(4) preparation of outer cladding layer:
In order to guarantee that outer cladding layer is better than interior cladding layer, the transition on the performance is arranged, there is the cooling of interior cladding layer sample on the surface after, polishing and cut sample in the surface, guarantees the cladding layer consistency of thickness, cleaning surfaces; Carry out the cladding second time on the cladding layer surface, outer cladding layer alloying constituent is, by mass percentage: Si:2%～3%, Mn:1%～2%, Al:0.5%～1%, Mo:0.5%～1.5%, Ni:3%～5%, Cr
3C
2: 40%～50%, surplus is Fe, the interior cladding layer content of Cr3C2 content exceeds 10%～20% in its China and foreign countries' cladding layer;
Outer cladding layer plasma cladding processing parameter is as follows:
Plasma (orifice) gas is argon gas, working current 100-127A, operating voltage 16.9-21V, shield gas flow rate 1.2m
3/ h, electric power gas flow 0.8m
3/ h, nozzle is apart from surface distance 10mm, sweep velocity 190-200mm/min.
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| CN105349991A (en) * | 2015-11-25 | 2016-02-24 | 南京工程学院 | Preparing method for surface layer gradient alloy steel material based on bionic structure |
| CN105386034A (en) * | 2015-11-25 | 2016-03-09 | 南京工程学院 | Low-cost and long-service-life surface layer gradient material with stainless steel performance and preparing method of low-cost and long-service-life surface layer gradient material |
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| CN109487262B (en) * | 2018-09-04 | 2020-12-04 | 中国科学院近代物理研究所 | FeNi-based laser cladding doped tungsten carbide/chromium carbide composite reinforced high-temperature-resistant wear-resistant coating and preparation method thereof |
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