CN109943845A - A kind of nodularization MMC composite coating material and its laser cladding method - Google Patents
A kind of nodularization MMC composite coating material and its laser cladding method Download PDFInfo
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Abstract
The invention discloses a kind of nodularization MMC composite coating material and its laser cladding methods, are mixed by Fe powder, Mn powder, Si powder, Cr powder, Ni powder and nano WC powder；The coating material is prepared via a method which: (1) being put into ball mill ball milling after mixing the powder, obtain ball-milled powder；(2) ball-milled powder is dry, obtain dried powder；(3) dried powder is handled using laser spheroidization method, obtains the MMC composite coating material of nodularization.Its cladding method is to carry out laser melting coating using synchronous powder feeding system method.The present invention is evenly distributed with ceramic particle, and hardness is higher, more wear resistant, and can to shaped face repair the characteristics of.
Description
Technical field
The present invention relates to a kind of coating material and its laser cladding method, especially a kind of nodularization MMC composite coating material
And its laser cladding method.
Background technique
304 stainless steel machinabilitys are good, relatively cheap feature and be widely used in industrial production and life application in,
But there is the case where largely failing because of abrasion in practical applications.Therefore it is badly in need of the coating that exploitation promotes 304 stainless steel wearabilities,
For repairing or strengthening 304 stainless steels, while very high economic benefit can also be createed.For this purpose, people have researched and developed laser
Cladding Fe-Mn-Si system memorial alloy coating, using the stress adaptive characteristic of marmem, can slack remnants answer
Power, to obtain the coating of low residual stress；Stress adaptive characteristic can equally reduce in fretting wear and fatigue process
The stress generated in journey, to improve wearability and fatigue durability.
But traditional coating still has the disadvantages of hardness and insufficient wearability, hard ceramic mutually prepares the compound painting of MMC
Layer is widely used in strengthening material to improve the performances such as material hardness, wearability.Therefore ceramics are added in memorial alloy coating
Its wearability and hardness mutually can be improved, extend the application range of laser melting coating memorial alloy coating well.
But now current MMC composite coating still has following problem: 1, the ceramic powders being added are due to highly dense
The characteristics of spending easily is deposited on coating lower part, limits strengthening effect；2, existing composite coating dusty material is mostly ball-milling method preparation
Special-shaped powder, preset method can only be used in cladding process, smooth face can only be spent and repaired, shaped face can not then be repaired
It is multiple.Therefore, it is necessary to research and develop, a kind of hardness, wear-resistant strength are higher, and residual stress is lower, and can be realized the coating of synchronous powder feeding system
Material.
Summary of the invention
The object of the present invention is to provide a kind of nodularization MMC composite coating material and its laser cladding methods.Present invention tool
There is ceramic particle to be evenly distributed, hardness is higher, more wear resistant, and the characteristics of can repair to shaped face.
Technical solution of the present invention: a kind of nodularization MMC composite coating material, by Fe powder, Mn powder, Si powder, Cr powder
End, Ni powder and nano WC powder mix；The coating material is prepared via a method which:
(1) it is put into ball mill ball milling after mixing the powder, obtains ball-milled powder；
(2) ball-milled powder is dry, obtain dried powder；
(3) dried powder is handled using laser spheroidization method, obtains the MMC composite coating dusty material of nodularization.
Nodularization MMC composite coating material above-mentioned, the composite coating material by weight, by Fe44-56 parts,
Mn27-31 parts, Si7-9 parts, Cr3-4 parts, Ni2-3 parts and WC8-12 parts compositions.
Nodularization MMC composite coating material above-mentioned, the composite coating material by weight, by Fe48-52 parts,
Mn28-30 parts, Si8-9 parts, Cr3-4 parts, Ni2-3 parts and WC9-11 parts compositions.
Nodularization MMC composite coating material above-mentioned, the composite coating material by weight, by Fe50 parts, Mn29 parts,
Si8 parts, Cr3 parts, Ni3 parts and WC10 parts compositions.
Nodularization MMC composite coating material above-mentioned, the Fe powder, Mn powder, Si powder, Cr powder, Ni powder and receives
The purity of rice WC powder is all larger than 99.7%；Fe powder, Mn powder, Si powder, Cr powder and Ni powder granularity be 140-280
Mesh；The granularity of nano WC powder is 40-100nm.
Nodularization MMC composite coating material above-mentioned, in the step (1), abrasive material ratio when ball milling is 6-8:1, and revolving speed is
180-240r/min, Ball-milling Time 2-5h.
Nodularization MMC composite coating material above-mentioned, in the step (2), dry temperature is 110-130 DEG C, time 1-
3h。
Nodularization MMC composite coating material above-mentioned, in the step (3), laser spheroidization method be by dried powder 304 not
Rust steel substrate surface is laid to the powder bed of 0.4-1mm thickness, then carries out laser scanning, and wherein laser power is 300-
800 W, laser spot diameter are 3-6 mm, and laser scanning speed is 15-25 mm/s, are collected after laser scanning up to ball
The MMC composite coating dusty material of change.
A kind of laser cladding method of nodularization MMC composite coating material above-mentioned is to carry out laser using synchronous powder feeding system method
Cladding.
The laser cladding method of nodularization MMC composite coating material above-mentioned, the technological parameter of the laser melting coating are laser
Output power P=2-2.7 kW, scan velocity V=4-7 mm/s, spot size d=1 mm × 10 mm, overlapping rate 30-
50%, powder sending quantity is 0.4-0.8 g/s.
Beneficial effects of the present invention
1, after ceramic phase is added in coating material in the present invention, coating material is carried out by nodularization by laser spheroidization method, is made compound
The distribution of ceramic particle is more uniform in coating material, meanwhile, this process can make in-situ preparation in coating material be evenly distributed
Fe6W6C, so that there are higher hardness and strength after being prepared into coating.
2, the present invention is using memorial alloy powder as raw material, and after being handled by laser spheroidization, alloy coat and substrate are in smelting
Gold combines, while having lower residual stress, greatly improves the wear-resisting property of coating.
3, coating material of the invention is the material of nodularization, and compared with traditional dusty material, material of the invention can
To carry out cladding by synchronous powder feeding system method, that is to say, that do not need in substrate surface pre-made powder, and only need nodularization coating
Material is put into synchronous powder feeding system equipment, therefore, has the advantages that repair shaped face.
Possessed beneficial effect in order to further illustrate the present invention, inventor have done following experiment:
The hardness of material
Composite coating hardness result prepared by the present invention is as shown in Figure 1, the average hardness of coating reaches 3 times of substrate or so highests
Up to 1000HV or so, laser cladding coating (Fe60 etc.) hardness more iron-based than tradition is high by 30% or more, mainly because WC decomposes alloy
Element enters coating and generates solution strengthening and generated in-situ Fe6W6C phase is uniformly distributed generation second-phase strength in the coating and draws
It rises.
The wearability of material
Prepared by the MMC composite coating that resulting Laser Cladding in-situ generates to the present invention and carries out frictional wear experiment, acquired results
As shown in Figures 2 and 3, the wearability of composite coating is obviously improved relative to substrate after WC is added, and mainly be there is memory and is closed
The relexation of golden stress and obtain low residual stress coating and the stress in relaxation process of friction and wear, stress release fills
Point, there is also second-phase strength and solution strengthening, therefore coating abrasion performance is compared with the substrate and the iron-based laser cladding coating of tradition
To being greatly improved.
Detailed description of the invention
Attached drawing 1 is that the hardness of different WC content MMC composite coatings is distributed；
Attached drawing 2 is the friction coefficient curve of different WC content MMC composite coatings；
Attached drawing 3 is the abrasion loss of different WC content MMC composite coatings.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated, but is not intended as the foundation limited the present invention.
The embodiment of the present invention
Embodiment 1: a kind of nodularization MMC composite coating material by purity is 50 parts of 99.9%, Mn29 parts, Si8 parts, Cr3 parts,
Ni3 parts and WC10 form, and wherein the granularity of Fe powder, Mn powder, Si powder, Cr powder and Ni powder is 210 mesh；Nanometer WC powder
The granularity at end is 70nm；The coating material is prepared via a method which:
(1) will the powder mix after be put into ball mill ball milling, abrasive material ratio when ball milling is 7:1, revolving speed 210r/min, ball milling
Time 3h, obtains ball-milled powder；
(2) ball-milled powder is obtained into dried powder in 120 DEG C of dry 2h；
(3) dried powder is laid to the powder bed of 0.7mm thickness in 304 stainless steel substrate surfaces, then carries out laser scanning
Up to the MMC composite coating material of nodularization, wherein laser power is 500W, laser spot diameter 5mm, and laser scanning speed is
20mm/s collects the MMC composite coating material up to nodularization, obtains the MMC composite coating powder material of nodularization after laser scanning
Material.
Embodiment 2: a kind of nodularization MMC composite coating material, by purity be 99.8% Fe44 part, Mn27 parts, Si7 parts,
Cr3 parts, Ni2 parts and WC8 parts compositions, wherein the granularity of Fe powder, Mn powder, Si powder, Cr powder and Ni powder is 140 mesh；
The granularity of nano WC powder is 40nm；The coating material is prepared via a method which:
(1) will the powder mix after be put into ball mill ball milling, abrasive material ratio when ball milling is 6:1, revolving speed 180r/min, ball milling
Time 2h, obtains ball-milled powder；
(2) ball-milled powder is obtained into dried powder in 110 DEG C of dry 1h；
(3) dried powder is laid to the powder bed of 0.4mm thickness in 304 stainless steel substrate surfaces, then carries out laser scanning
Up to the MMC composite coating material of nodularization, wherein laser power is 300W, and laser spot diameter is 3 mm, laser scanning speed
For 15 mm/s, the MMC composite coating material up to nodularization is collected after laser scanning, obtains the MMC composite coating powder of nodularization
Material.
Embodiment 3: a kind of nodularization MMC composite coating material, by purity be 99.7% Fe56 part, Mn31 parts, Si9 parts,
Cr4 parts, Ni3 parts and WC12 parts compositions, wherein the granularity of Fe powder, Mn powder, Si powder, Cr powder and Ni powder is 280 mesh；
The granularity of nano WC powder is 100nm；The coating material is prepared via a method which:
(1) will the powder mix after be put into ball mill ball milling, abrasive material ratio when ball milling is 8:1, revolving speed 240r/min, ball milling
Time 5h, obtains ball-milled powder；
(2) ball-milled powder is obtained into dried powder in 130 DEG C of dry 3h；
(3) dried powder is laid to the powder bed of 1mm thickness in 304 stainless steel substrate surfaces, then carrying out laser scanning is
The MMC composite coating material of nodularization is obtained, wherein laser power is 800 W, and laser spot diameter is 6 mm, and laser scanning speed is
25 mm/s collect the MMC composite coating material up to nodularization, obtain the MMC composite coating powder material of nodularization after laser scanning
Material.
Embodiment 4: a method of cladding being carried out using above-mentioned nodularization MMC composite coating material, steps are as follows: by institute
The MMC composite coating material for stating nodularization is placed in synchronous powder feeder, synchronizes powder feeding, meanwhile, control laser output power P=
2.4kW, scan velocity V=5 mm/s, the spot size d=1 mm of mm × 10, overlapping rate 40%, powder sending quantity are 0.6 g/s.
Embodiment 5: a method of cladding being carried out using above-mentioned nodularization MMC composite coating material, steps are as follows: by institute
The MMC composite coating material for stating nodularization is placed in synchronous powder feeder, synchronizes powder feeding, meanwhile, control laser output power P=
2kW, scan velocity V=4 mm/s, the spot size d=1 mm of mm × 10, overlapping rate 30%, powder sending quantity are 0.4 g/s.
Embodiment 6: a method of cladding being carried out using above-mentioned nodularization MMC composite coating material, steps are as follows: by institute
The MMC composite coating material for stating nodularization is placed in synchronous powder feeder, synchronizes powder feeding, meanwhile, control laser output power P=
2.7 kW, scan velocity V=7 mm/s, the spot size d=1 mm of mm × 10, overlapping rate 50%, powder sending quantity are 0.8 g/s.
Claims (10)
1. a kind of nodularization MMC composite coating material, it is characterised in that: by Fe powder, Mn powder, Si powder, Cr powder, Ni powder
It is mixed with nano WC powder；The coating material is prepared via a method which:
(1) it is put into ball mill ball milling after mixing the powder, obtains ball-milled powder；
(2) ball-milled powder is dry, obtain dried powder；
(3) dried powder is handled using laser spheroidization method, obtains the MMC composite coating dusty material of nodularization.
2. nodularization MMC composite coating material according to claim 1, it is characterised in that: the composite coating material is by weight
Part meter is measured, is formed by Fe44-56 parts, Mn27-31 parts, Si7-9 parts, Cr3-4 parts, Ni2-3 parts and WC8-12 parts.
3. nodularization MMC composite coating material according to claim 2, it is characterised in that: the composite coating material is by weight
Part meter is measured, is formed by Fe48-52 parts, Mn28-30 parts, Si8-9 parts, Cr3-4 parts, Ni2-3 parts and WC9-11 parts.
4. nodularization MMC composite coating material according to claim 3, it is characterised in that: the composite coating material is by weight
Part meter is measured, is formed by Fe50 parts, Mn29 parts, Si8 parts, Cr3 parts, Ni3 parts and WC10 parts.
5. nodularization MMC composite coating material according to claim 1, it is characterised in that: the Fe powder, Mn powder, Si
Powder, Cr powder, Ni powder and nano WC powder purity be all larger than 99.7%；Fe powder, Mn powder, Si powder, Cr powder and
The granularity of Ni powder is 140-280 mesh；The granularity of nano WC powder is 40-100nm.
6. nodularization MMC composite coating material according to claim 1, it is characterised in that: in the step (1), when ball milling
Abrasive material ratio be 6-8:1, revolving speed 180-240r/min, Ball-milling Time 2-5h.
7. nodularization MMC composite coating material according to claim 1, it is characterised in that: in the step (2), dry
Temperature is 110-130 DEG C, time 1-3h.
8. nodularization MMC composite coating material according to claim 1, it is characterised in that: in the step (3), laser ball
Change method is the powder bed that dried powder is laid to 0.4-1mm thickness in 304 stainless steel substrate surfaces, then carries out laser scanning
, wherein laser power is 300-800 W, and laser spot diameter is 3-6 mm, and laser scanning speed is 15-25 mm/s, is swashed
The MMC composite coating dusty material up to nodularization is collected after optical scanning.
9. a kind of laser cladding method of nodularization MMC composite coating material according to claim 1-8, feature
It is: is that laser melting coating is carried out using synchronous powder feeding system method.
10. the laser cladding method of nodularization MMC composite coating material according to claim 10, it is characterised in that: described
The technological parameter of laser melting coating is laser output power P=2-2.7 kW, scan velocity V=4-7 mm/s, spot size d=1
The mm of mm × 10, overlapping rate 30-50%, powder sending quantity is 0.4-0.8 g/s.
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Cited By (3)
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| CN110438487A (en) * | 2019-07-16 | 2019-11-12 | 华电电力科学研究院有限公司 | Wear-resistant corrosion-resistant laser cladding layer of a kind of micro-nano granules enhancing and preparation method thereof |
| CN114517294A (en) * | 2022-01-28 | 2022-05-20 | 营口裕隆光电科技有限公司 | Metallurgical powder for repairing 80CrNi3W cold roll by laser cladding |
| RU2782498C1 (en) * | 2021-12-28 | 2022-11-01 | федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский политехнический университет Петра Великого" (ФГАОУ ВО "СПбПУ") | Method for obtaining a wear-resistant coating from a high-entropy alloy with a surface-carbonized layer |
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