CN106894018A - A kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The preparation facilities and method of coating - Google Patents
A kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The preparation facilities and method of coating Download PDFInfo
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- CN106894018A CN106894018A CN201710214210.4A CN201710214210A CN106894018A CN 106894018 A CN106894018 A CN 106894018A CN 201710214210 A CN201710214210 A CN 201710214210A CN 106894018 A CN106894018 A CN 106894018A
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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
- 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
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Abstract
The present invention relates to wear-resistant coating field, particularly a kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The preparation facilities and method of coating.Described device includes work support, and the support is provided with substrate, the surface coating reaction molten bath, and coating reaction molten bath both sides are provided with ceramic thermal insulation plate, and the ceramic thermal insulation plate top is provided with plasma arc rifle；The base plate bottom is provided with bosh.Methods described is with Cr3C2It is raw material with Fe Ni powder, powder feeder is loaded after mixing in proportion, using the coaxial automatic powder feeding plasma in situ alloying technology prepares coatings of CNC, coating both sides is incubated with refractory ceramics, and coating base plate is forced to cool down from bottom, obtains M7C3Thermograde needed for oriented growth, realizes oriented growth M7C3The preparation of coating.The Cr that the present invention is used3C2Can be used as primary phase M7C3Nonuniformity forming core substrate, so promoting M7C3The forming core of cylinder, defect is few, and abrasion resistance is more excellent.
Description
Technical field
The present invention relates to wear-resistant coating field, particularly a kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3Coating
Device and method.
Background technology
Ferrochrome based composites high are a kind of high-abrasive materials of function admirable.Because it has high rigidity, wear-resistant, chemical steady
Qualitative, high-melting-point, relatively low linear expansion coefficient etc., are usually used in manufacturing hard alloy, are widely used in the fields such as mine, cement
Wear-resisting machinery, such as：The jaw of jaw ore crusher and the tup of hammer mill.Double carbide M7C3(M=Cr, Fe) is height
The enhancing phase of ferrochrome based composites, the carbide growth be long column shape, with obvious anisotropy, its transverse section hardness and
Wearability is above longitudinal section.Therefore oriented growth M is prepared7C3Material is the important channel for improving wearability.
Patent announcement number discloses " a kind of wear-resisting steel of carbide oriented growth for the patent of invention of CN106086592A
Preparation method ", it is pressed into many posts after ball mill mixing with graphite powder, high-purity iron powder and alloy powder as raw material with tablet press machine
Shape sample, then be stacked in the quartz ampoule that one end open one end is remained silent, under vacuum conditions to quartz ampoule inducing melting, treat
Quartz ampoule is smashed after cooling and takes out high-abrasive material.
In such scheme, the high-abrasive material of preparation is overall block, and material block size is by the caliber size of quartz ampoule
Limitation, so not being suitable for larger-size workpiece, can not prepare oriented growth M on any shape workpiece surface7C3Apply
Layer.
The content of the invention
Oriented growth M is prepared it is an object of the invention to provide one kind heterogeneous forming core reaction in situ7C3The device of coating and side
Method, oriented growth M is prepared in piece surface7C3Coating, not only wearability is improved, and face coat and overall bulk material
Material is few compared to consumption of raw materials, can save a large amount of expensive alloys powder.
Technology design of the invention：The present invention prepares oriented growth M using the heterogeneous forming core reaction of plasma in situ7C3Coating.
Due to Cr3C2Free energy is higher, and decarburizing reaction is susceptible in Fe based alloys molten bath, and is sent to that free energy is relatively low, stability certainly
M higher7C3(M=Cr, Fe) changes.While Cr3C2Can be used as primary phase M7C3Nonuniformity forming core substrate, so as to promote M7C3Shape
Nucleus growth, can not only improve M7C3Growing amount, and M7C3Column structure defect is few, more complete.In addition, M7C3Intrinsic growth it is special
It is hexagonal prism shape to levy, and table 1 is M7C3The free energy of each crystal face of crystalE surf And the speed of growthR hkl , wherein M7C3Grain boundary
Crystal face its growth rate that can be higher is bigger, on the contrary interface can smaller crystal face growth rate it is smaller, such as：{ 640 } boundary of { 620 }
Face energyE surfRespectively -9.2955 and -9.13474 kcal/mol/, growth rateR hkl Respectively 1.01843 Hes
0.96411/Å；{ 011 } { 002 } interface energyE surfRespectively -2.67987 and -2.65248 kcal/mol/, growth rateR hkl Respectively 0.11519 and 0.13107/, this follows the thermodynamics and dynamics law of crystal growth.By crystal growth
Gibbs-Wulff theorems and BFDH models understand：M7C3The growth such as crystal face { 640 } { 620 } { 260 } is very fast in crystal, so that certainly
Determine carbide M7C3Morphological significance during growthform is smaller, final to disappear, and crystal face { 011 } { 002 } { 101 } { 111 }
Growth rate is smaller, and it determines M7C3The importance of growthform is maximum, finally reveals.M after growing up7C3Crystal is by { 011 }
{ 002 } { 101 } crystal face composition, due to crystal face { 011 } and crystal face { 002 } face number and be 6, so as to constitute approximate six face
Structure.Because crystal face { 101 } interface can be far above { 011 } and { 002 }, so growth rate is very fast, final displaying area is minimum, institute
With M7C3The intrinsic growthform of crystal is hexa-prism.It can be seen that being not only easier to synthesize M in theory7C3, and itself have single
To the physical characteristic of growth.Because crystal grows up mode and process is mainly by hot-fluid control, if so wanting to realize primary phase M7C3It is fixed
To growth, one-dimensional direction of heat flow need to be maintained, so can not only suppress M7C3Other directions of crystal grow, and can make all M7C3
Crystal is grown up along backheating stream direction, obtains oriented growth M7C3。
The M of table 17C3The free energy of each crystal face of crystalE surf And the speed of growthR hkl
Technical solution of the present invention is：
A kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The preparation facilities of coating, described device includes work support,
The support is provided with substrate, and the surface coating reaction molten bath, coating reaction molten bath both sides are provided with ceramic thermal insulation
Plate, the ceramic thermal insulation plate top is provided with plasma arc rifle；
The base plate bottom is provided with bosh, and the bosh is connected with water inlet pipe, and the water inlet pipe is connected with water pump, institute
State water pump to be connected with refrigeration machine, the refrigeration machine is connected with outlet pipe.
Preferably, the ceramic thermal insulation plate, coating reaction molten bath top are provided with heat preserving ceramic fiber.
It is further preferred that the bosh, valve is provided between water inlet pipe, water pump, refrigeration machine, outlet pipe, it is described
Ceramic thermal insulation sheet material matter is corundum.
A kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The method of coating, methods described comprises the following steps：
1) cleaning substrate top layer dirt, if in piece surface prepares coating, needing to carry out blasting treatment to its surface, then will
The substrate for having pre-processed is put into work support, is fixedly clamped；
2) reaction in-situ alloy powder is configured, reaction alloy powder includes Cr3C2Powder, Fe-Ni powder, after mixing in proportion, load
Current-carrying gas are in the powder feeder of argon gas；
3) according to coating widths in two refractory ceramics warming plates being placed in parallel of substrate surface two-side adhesive；
4) recirculating cooling water system is opened to cool down base plate bottom；
5) coaxial automatic powder feeding plasma in situ metallurgical technology is controlled using numerical control, reaction obtains M7C3Coating.
Preferably, the alloy powder includes following component by mass percentage：Cr3C2Powder 15%-50%, balance of Fe-
Ni powder；
Ni mass percents are 30% in the Fe-Ni powder；Fe mass percents are 69%；Re mass percents are 1%.
The Cr3C2Powder Particle Size is 100-150 μm, and the Fe-Ni Powder Particle Sizes are 60-180 μm.
Preferably, the step 2）The alloyed powder of coating uses coaxial automatic powder feeding.
Preferably, the step 3）Ceramic thermal insulation sheet material matter is corundum, and its alumina content is 99.5%, and heat resisting temperature is big
In 1600 DEG C.
Preferably, the step 4) cooler-water temperature be 2-3 DEG C, flow velocity is 1-1.5m/s.
Preferably, the step 5) plasma in situ metallurgical technology parameter is：Electric current：80-110A；Voltage：40-50V；
Ion-gas flow：3-5L/min；Protection air-flow amount is：7-8L/min；Powder feed rate：10-20g/min；Powder feeding throughput：1.5-
3L/min；CNC translational speeds：50-80mm/min；Coating prepares side alumina-silicate ceramic fibre and covers weld pool surface insulation.
It is further preferred that the thickness of the ceramic fibre is 30-50mm, heat resisting temperature is 1200-1300 DEG C.
Beneficial effect of the present invention：
1）Using Cr3C2And Fe-Ni alloy/C mixed-powder is raw material, on the substrate of pretreatment using coaxial automatic powder feeding etc. from
Sub- in-situ metallurgical technique prepares coating, and coating molten bath is incubated in real time, while being forced to molten bath bottom using cooling water
Cooling, to obtain M7C3Thermograde needed for oriented growth.
2) the method prepares oriented growth M for heterogeneous forming core reaction in situ7C3, not only increase M7C3Nucleation rate, increase
Reaction growing amount, and the M for generating are added7C3Fault of construction is few, more complete.
3) M of the method generation7C3Be in-situ authigenic, it is not only big with basal body interface adhesion, and oriented growth M7C3
Cross section has wear resistence very high.
4) using recirculated cooling water from coating bottom forced refrigeration, circulating cooling coolant-temperature gage is 2-3 to the method base plate bottom
DEG C, flow velocity is 1-1.5m/s, so as to ensure that a molten bath heat is taken away rapidly, Insulation is taken on top, so as in molten bath cooling
During form thermograde from top to bottom, cooling system used sets with coaxial automatic powder feeding plasma in situ alloying technology
Standby simple, stabilization, easily manipulation.
5) the method prepares oriented growth M7C3Alloy raw material consumption is small during coating, compared with bulk material, can save big
Amount expensive metal.
6) the method is coaxial powder-feeding technique, efficiency is improve compared with powder technology of precoating, and substrate shape is adapted to
Property is stronger, can prepare oriented growth M in regular, irregular component surface7C3Coating.
Summary, the present invention has the beneficial effect that：The M of oriented growth is prepared using heterogeneous forming core reaction in situ7C3Coating, and
There is epitaxial growth process to compare, the technique device therefor is simple, stabilization, easily manipulation；Compared with bulk material, surface prepares coating
A large amount of expensive alloys can be saved, to the geometry strong adaptability of substrate；Heterogeneous forming core in situ can improve product M7C3Life
Cheng Liang, and oriented growth M7C3It is that in-situ authigenic is formed in matrix, therefore surface is clean pollution-free strong with parent phase interface cohesion
Degree is high.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples：
Fig. 1 is fabricated in situ oriented growth M of the present invention7C3Coating process figure.Wherein 1- matrixes, 2- supports, 3- water inlet pipes, 4- water
Pump, 5- refrigeration machines, 6- boshes, 7- outlet pipes, 8- valves, 9- ceramic thermal insulation plates, 10- coating reactions molten bath, 11- plasmas
Arc rifle, 12- heat preserving ceramic fibers.
Fig. 2 is fabricated in situ oriented growth M of the present invention7C3Coating metallographic microstructure figure (contains matrix material).
Fig. 3 is fabricated in situ oriented growth M of the present invention7C3SEM figures (having removed matrix material) of three-dimensional column structure.
Fig. 4 is mixed and disorderly growth M prepared by traditional handicraft7C3The SEM figures of three-dimensional column structure（Matrix material is removed）.
Fig. 5 is oriented growth M7C3The wear rate of coating and fracture toughness intensity factor.
Specific embodiment
The present invention is further illustrated with reference to embodiment, but the scope of protection of present invention is not limited to implement
The scope of example statement.
The present invention proposes that a kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The method of coating, Fig. 1 is fabricated in situ
Oriented growth M7C coating process figures；Fig. 2 is oriented growth M7C3With the metallographic microstructure figure of coated substrate；Fig. 3 is removal week
Enclose the oriented growth M observed under Electronic Speculum after matrix7C3Three-dimensional column structure；Fig. 4 is the mixed and disorderly growth prepared using traditional handicraft
M7C3The SEM figures of three-dimensional column structure；Fig. 5 is oriented growth M7C3The wear rate of coating and fracture toughness intensity factor.Can see
To the M of fabricated in situ of the present invention7C3Geometry is complete, and is grown along cylinder portrait orientation（Direction of heat flow）, with higher resistance to
Mill property and fracture toughness.
Embodiment 1
A kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The preparation facilities of coating, described device includes work support 2,
The support 2 is provided with substrate 1, the top coating reaction molten bath 10 of the substrate 1, and the both sides of coating reaction molten bath 10 are provided with pottery
Porcelain warming plate 9, the top of the ceramic thermal insulation plate 9 is provided with plasma arc rifle 11；
The bottom of the substrate 1 is provided with bosh 6, and the bosh 6 is connected with water inlet pipe 3, the water inlet pipe 3 and water pump 4
Connection, the water pump 4 is connected with refrigeration machine 5, and the refrigeration machine 5 is connected with outlet pipe 7.
Preferably, the ceramic thermal insulation plate 9, the top of coating reaction molten bath 10 are provided with heat preserving ceramic fiber 12.
It is further preferred that valve is provided between the bosh 6, water inlet pipe 3, water pump 4, refrigeration machine 5, outlet pipe 7,
The ceramic thermal insulation sheet material matter is corundum.
Embodiment 2
It is prepared using the device of embodiment 1, the surface of substrate 1 of polishing first is dried after being cleaned with acetone；The base that will have been pre-processed
Plate 1 is put on the work support 2 of bosh 6, and then Open valve 8, water pump 4, refrigeration machine 5 are carried out to workpiece successively in order
Cooling treatment, ceramic thermal insulation plate 9 is bonded according to coating widths and length on substrate.
By 20% Cr3C2Powder（100-150 μm of granularity）And 80% Fe-Ni self-melting alloy powder（Ni=30%；Re=1%；
Fe=69%, granularity is 60-180 μm）After drying is well mixed, it is fitted into automatic powder feeding device；Open plasma arc rifle 11, technique ginseng
Number is：Electric current：80A；Voltage：40V；Ion-gas flow：3L/min；Protection air-flow amount is：7L/min；Powder feed rate：10g/
min；Powder feeding throughput：1.5L/min；CNC translational speeds：50-80mm/min；In prepares coating with high-temperature ceramic fibre 12
It is covered in the reaction surface heat preservation of molten bath 10.Coating is obtained after molten bath cools down, the oriented growth M of coating situ synthesis is measured7C3
Volume fraction is 33.6vol%.
Gained oriented growth M7C3Coating on M-2000 abrasion testers with T10 pair materials（Rockwell hardness HRC=63 ±
1）Mill is tested（Pressure 300N, slides 1000 meters）, wear rate is measured for 25.6 (mm3/Nm)×10-7；In CMT5015 electronics ten thousand
Coating quasistatic fracture toughness intensity factor K can be measured on testing machineIC=23MPa.m1/2（Fig. 5）.
Embodiment 3
It is prepared using the device of embodiment 1, the surface of substrate 1 of polishing first is dried after being cleaned with acetone；The base that will have been pre-processed
Plate 1 is put on the work support 2 of bosh 6, and then Open valve 8, water pump 4, refrigeration machine 5 are carried out to workpiece successively in order
Cooling treatment, ceramic thermal insulation plate 9 is bonded according to coating widths and length on substrate.
By 30% Cr3C2Powder（100-150 μm of granularity）And 70% Fe-Ni self-melting alloy powder（Ni=30%；Re=1%；
Fe=69%, granularity is 60-180 μm）After drying is well mixed, it is fitted into automatic powder feeding device；Open plasma arc rifle 11, technique ginseng
Number is：Electric current：110A；Voltage：50V；Ion-gas flow：5L/min；Protection air-flow amount is：8L/min；Powder feed rate：20g/
min；Powder feeding throughput：3L/min；CNC translational speeds：80mm/min；It is covered in high-temperature ceramic fibre 12 in prepares coating
The reaction surface heat preservation of molten bath 10.Coating is obtained after molten bath cools down, the oriented growth M of coating situ synthesis is measured7C3Volume integral
Number is 43.9vol%.
Gained oriented growth M7C3Coating on M-2000 abrasion testers with T10 pair materials（Rockwell hardness HRC=63 ±
1）Mill is tested（Pressure 300N, slides 1000 meters）, wear rate is measured for 22.3 (mm3/Nm)×10-7；In CMT5015 electronics ten thousand
Coating quasistatic fracture toughness intensity factor K can be measured on testing machineIC=21MPa.m1/2（Fig. 5）.
Embodiment 4
It is prepared using the device of embodiment 1, the surface of substrate 1 of polishing first is dried after being cleaned with acetone；The base that will have been pre-processed
Plate 1 is put on the work support 2 of bosh 6, and then Open valve 8, water pump 4, refrigeration machine 5 are carried out to workpiece successively in order
Cooling treatment, ceramic thermal insulation plate 9 is bonded according to coating widths and length on substrate.
By 40% Cr3C2Powder（100-150 μm of granularity）And 60% Fe-Ni self-melting alloy powder（Ni=30%；Re=1%；
Fe=69%, granularity is 60-180 μm）After drying is well mixed, it is fitted into automatic powder feeding device；Open plasma arc rifle 11, technique ginseng
Number is：Electric current：100A；Voltage：45V；Ion-gas flow：4L/min；Protection air-flow amount is：7.5L/min；Powder feed rate：15g/
min；Powder feeding throughput：2.5L/min；CNC translational speeds：70mm/min；Covered with high-temperature ceramic fibre 12 in prepares coating
In the reaction surface heat preservation of molten bath 10.Coating is obtained after molten bath cools down, the oriented growth M of coating situ synthesis is measured7C3Volume
Fraction is 56.2vol%.
Gained oriented growth M7C3Coating on M-2000 abrasion testers with T10 pair materials（Rockwell hardness HRC=63 ±
1）Mill is tested（Pressure 300N, slides 1000 meters）, wear rate is measured for 19.8 (mm3/Nm)×10-7；In CMT5015 electronics ten thousand
Coating quasistatic fracture toughness intensity factor K can be measured on testing machineIC=18MPa.m1/2（Fig. 5）.
The above embodiments are only the preferred technical solution of the present invention, and are not construed as limitation of the invention, in the application
Embodiment and embodiment in feature in the case where not conflicting, can mutually be combined.Protection scope of the present invention should
With the technical scheme that claim is recorded, including in the technical scheme recorded of claim, the equivalents of technical characteristic are
Protection domain.Equivalent i.e. within this range is improved, also within protection scope of the present invention.
Claims (10)
1. a kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The preparation facilities of coating, it is characterised in that：Described device bag
Include work support（2）, the support（2）It is provided with substrate（1）, the substrate（1）Top coating reaction molten bath（10）, the painting
Layer reaction molten bath（10）Both sides are provided with ceramic thermal insulation plate（9）, the ceramic thermal insulation plate（9）Top is provided with plasma arc rifle（11）；
The substrate（1）Bottom is provided with bosh（6）, the bosh（6）With water inlet pipe（3）Connection, the water inlet pipe
（3）With water pump（4）Connection, the water pump（4）With refrigeration machine（5）Connection, the refrigeration machine（5）With outlet pipe（7）Connection.
2. heterogeneous forming core reaction in situ according to claim 1 prepares oriented growth M7C3The preparation facilities of coating, its feature
It is：The ceramic thermal insulation plate（9）, coating reaction molten bath（10）Top is provided with heat preserving ceramic fiber（12）.
3. heterogeneous forming core reaction in situ according to claim 2 prepares oriented growth M7C3The preparation facilities of coating, its feature
It is：
The bosh（6）, water inlet pipe（3）, water pump（4）, refrigeration machine（5）, outlet pipe（7）Between be provided with valve, the pottery
Porcelain warming plate material is corundum.
4. a kind of heterogeneous forming core reaction in situ prepares oriented growth M7C3The method of coating, it is characterised in that：Methods described is included such as
Lower step：
1) cleaning substrate top layer dirt, if in piece surface prepares coating, needing to carry out blasting treatment to its surface, then will
The substrate for having pre-processed is put into work support, is fixedly clamped；
2) reaction in-situ alloy powder is configured, reaction alloy powder includes Cr3C2Powder, Fe-Ni powder, after mixing in proportion, load and carry
Gas body is in the powder feeder of argon gas；
3) according to coating widths in two refractory ceramics warming plates being placed in parallel of substrate surface two-side adhesive；
4) recirculating cooling water system is opened to cool down base plate bottom；
5) coaxial automatic powder feeding plasma in situ metallurgical technology is controlled using numerical control, reaction obtains M7C3Coating.
5. one kind according to claim 4 heterogeneous forming core reaction in situ prepares oriented growth M7C3The method of coating, its feature
It is：The alloy powder includes following component by mass percentage：Cr3C2Powder 15%-50%, balance of Fe-Ni powder；
Ni mass percents are 30% in the Fe-Ni powder；Fe mass percents are 69%；Re mass percents are 1%；It is described
Cr3C2Powder Particle Size is 100-150 μm, and the Fe-Ni Powder Particle Sizes are 60-180 μm.
6. one kind according to claim 4 heterogeneous forming core reaction in situ prepares oriented growth M7C3The method of coating, its feature
It is：The step 2）The alloyed powder of coating uses coaxial automatic powder feeding.
7. one kind according to claim 4 heterogeneous forming core reaction in situ prepares oriented growth M7C3The method of coating, its feature
It is：The step 3）Ceramic thermal insulation sheet material matter is corundum, and its alumina content is 99.5%, and heat resisting temperature is more than 1600 DEG C.
8. one kind according to claim 4 heterogeneous forming core reaction in situ prepares oriented growth M7C3The method of coating, its feature
It is：The step 4) cooler-water temperature be 2-3 DEG C, flow velocity is 1-1.5m/s.
9. one kind according to claim 4 heterogeneous forming core reaction in situ prepares oriented growth M7C3The method of coating, its feature
It is：The step 5) plasma in situ metallurgical technology parameter is：Electric current：80-110A；Voltage：40-50V；Ion-gas flow：
3-5L/min；Protection air-flow amount is：7-8L/min；Powder feed rate：10-20g/min；Powder feeding throughput：1.5-3L/min；CNC
Translational speed：50-80mm/min；Coating prepares side alumina-silicate ceramic fibre and covers weld pool surface insulation.
10. one kind according to claim 9 heterogeneous forming core reaction in situ prepares oriented growth M7C3The method of coating, it is special
Levy and be：The thickness of the ceramic fibre is 30-50mm, and heat resisting temperature is 1200-1300 DEG C.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110129710A (en) * | 2019-06-06 | 2019-08-16 | 兰州理工大学温州泵阀工程研究院 | A kind of method that reversed cooling prepares oriented structure coating |
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| CN110129710B (en) * | 2019-06-06 | 2021-05-18 | 兰州理工大学温州泵阀工程研究院 | Method for preparing oriented structure coating by reverse cooling |
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