CN107740094B - High-temperature sealing coating for machine brake and preparation method thereof - Google Patents
High-temperature sealing coating for machine brake and preparation method thereof Download PDFInfo
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- CN107740094B CN107740094B CN201710857022.3A CN201710857022A CN107740094B CN 107740094 B CN107740094 B CN 107740094B CN 201710857022 A CN201710857022 A CN 201710857022A CN 107740094 B CN107740094 B CN 107740094B
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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
- C23C24/106—Coating with metal alloys or metal elements only
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
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Abstract
the invention relates to the technical field of high-temperature sealing coatings, in particular to a high-temperature sealing coating used on a gate and a preparation method thereof, wherein the high-temperature sealing coating is prepared by a laser cladding method, the powder for laser cladding comprises high-entropy alloy powder, the high-entropy alloy powder comprises, by weight, 22.0-25.0% of nickel, 22.0-24.0% of chromium, 20-24.0% of iron, 3.5-4.9% of aluminum, 0.1-0.5% of hafnium, 0.4-1.0% of rare earth yttrium, A% of carbon, B% of oxygen and the balance of cobalt, wherein A is less than 0.01 and B is less than 0.05, and the thickness of the sealing coating is 0.3-0.7 mm.
Description
Technical Field
The invention relates to the technical field of high-temperature sealing coatings, in particular to a high-temperature sealing coating for a brake and a preparation method thereof.
Background
The sealing coating can realize near-zero control of blade tip clearance, greatly increase the efficiency of the aircraft engine, improve the thrust of the engine, reduce fuel consumption and prolong the service life, and is an indispensable key technology for manufacturing the aircraft engine. With the continuous development of aero-engines in the directions of high thrust-weight ratio, high flow ratio and the like, the temperature of fuel gas is continuously increased, the working temperature of a hot end part turbine exceeds 1100 ℃, and high requirements are provided for high-temperature abradable seal coatings of high-pressure turbine outer rings and other parts. The coating is required to have high abradability, erosion resistance, bonding strength and the like, and also to have excellent high-temperature oxidation resistance, high-temperature thermal stability and thermal shock resistance. The prior sealing coatings prepared by thermal spraying, such as NiCrAl/bentonite, NiCrAl/diatomite, MCrAlY/polyphenyl ester and the like, have insufficient oxidation resistance and corrosion resistance, so that the abradability of the coatings is obviously reduced when the service temperature exceeds 1000 ℃. Yttria Stabilized Zirconia (YSZ) is considered to be an important candidate for high temperature abradable seal coatings that are above 1000 ℃ and promising due to its good thermal insulation properties, matching with metal substrates and sintering resistance. However, the hardness of the ceramic-based high-temperature abradable seal coating is high, and the blade is easily abraded in the process of contacting with the blade tip, and although researchers try to introduce polyphenyl ester, h-BN and other component improvements to enhance the abradability of the coating, the combined properties of bonding strength, erosion resistance and the like are weakened.
Therefore, a high-temperature sealing coating with good high-temperature performance and high bonding strength with a substrate and a preparation method thereof are urgently needed in the market at present.
disclosure of Invention
the high-temperature sealing coating used on the brake is high in bonding strength with a substrate, has good high-temperature frictional wear performance and high-temperature oxidation resistance, is moderate in hardness, and is not easy to wear blades.
in order to achieve the purpose, the invention adopts the technical scheme that: a high-temperature sealing coating used on a gate is prepared by a laser cladding method, the powder for laser cladding comprises high-entropy alloy powder, and the high-entropy alloy powder comprises the following components in percentage by weight:
22.0 to 25.0 percent of nickel;
22.0 to 24.0 percent of chromium;
20 to 24.0 percent of iron;
3.5 to 4.9 percent of aluminum;
0.1 to 0.5 percent of hafnium;
0.4 to 1.0 percent of rare earth yttrium;
carbon A%, A < 0.01;
B% of oxygen, B < 0.05;
the balance of cobalt;
The thickness of the sealing coating is 0.3-0.7 mm.
further, the powder for laser cladding comprises the following components in percentage by weight: 23.0 percent of nickel, 22.5 percent of chromium, 22.0 percent of iron, 4.2 percent of aluminum, 0.3 percent of hafnium, 0.6 percent of rare earth yttrium, A percent of carbon, B percent of oxygen and the balance of cobalt, wherein A is less than 0.01, and B is less than 0.05.
Further, the powder for laser cladding also comprises CaF2 powder which is uniformly mixed with the high-entropy alloy powder, and the mass of the CaF2 powder accounts for 5-30% of the mass of the high-entropy alloy powder.
Further, the powder for laser cladding comprises the following components in percentage by weight: 24.5% of nickel, 23.0% of chromium, 23.5% of iron, 4.0% of aluminum, 0.4% of hafnium, 0.5% of rare earth yttrium, A% of carbon and B% of oxygen, wherein the balance is cobalt, A is less than 0.01, B is less than 0.05, the powder for laser cladding is composed of the high-entropy alloy powder and CaF2 powder, and the mass of the CaF2 powder accounts for 10% of the mass of the high-entropy alloy powder.
Further, the powder for laser cladding comprises the following components in percentage by weight: 23.5% of nickel, 22.8% of chromium, 21.5% of iron, 4.2% of aluminum, 0.3% of hafnium, 0.6% of rare earth yttrium, A% of carbon and B% of oxygen, wherein the balance is cobalt, A is less than 0.01, B is less than 0.05, the powder for laser cladding is composed of the high-entropy alloy powder and CaF2 powder, and the mass of the CaF2 powder accounts for 15% of the mass of the high-entropy alloy powder.
furthermore, the granularity of the high-entropy alloy powder is 100-350 meshes.
The invention also provides a method for preparing the high-temperature sealing coating, which comprises the following steps:
(1) Aligning a laser head of a laser to the surface of the machine brake;
(2) Uniformly feeding the powder for laser cladding to the surface of the machine brake aligned to the laser head;
(3) The laser head emits laser to melt the powder for laser cladding, and reactants generated by melting cover the surface of the gate to form a cladding layer;
(4) and the laser head scans in a preset range on the surface of the machine brake to realize continuous cladding on the surface in the preset range, and the high-temperature sealing coating is obtained.
further, in the step (2), the laser beam is in a hollow ring shape, the powder for laser cladding is located inside the ring shape of the laser beam, the laser beam surrounds the powder for laser cladding, and the powder beam formed by the powder for laser cladding in the powder feeding process is always coaxial with the laser beam.
furthermore, the scanning path of the laser head in the preset range on the surface of the gate is that the laser head moves from a starting point to a specified length along a certain preset linear direction, the laser is closed, the laser head moves to the next starting point, the laser is started to scan again, the laser scans once to form a single-channel cladding layer, the steps are repeated, and the front-channel cladding layer covering part of the current-channel cladding layer is covered to form the lap joint of the current-channel cladding layer and the front-channel cladding layer.
Furthermore, the power of the laser is 800-1000W, the laser scanning speed is 6-10mm/s, the defocusing amount is 0-3mm, and the powder feeding rate is 8-12 g/min.
after adopting the technical scheme, compared with the prior art, the invention has the following advantages: the cobalt-based high-temperature sealing coating alloy powder provided by the invention contains cobalt, nickel, chromium, iron and aluminum elements which can form a stable gamma- (Co, Ni and Cr) solid solution and precipitate fine and dispersed Y2O3 at a subboundary. The gamma- (Co, Ni, Cr) solid solution with compact structure and excellent thermal stability has good high-temperature frictional wear performance and high-temperature oxidation resistance. The high-temperature frictional wear performance can be further improved by changing the form of the substructure, and the high-temperature frictional wear-resistant coating is particularly suitable for high-temperature sealing coatings of engines and the like. The laser hollow internal powder feeding forming technology is adopted to ensure that the light beam transformation is accurate and easy to control, the powder clustering performance is good, the whole process coupling of the optical powder is realized, the surface defect self-healing is realized, the generation of micro-cracks can be effectively avoided, and the surface quality is good.
Drawings
FIG. 1 is a metallographic structure obtained in example 1 of the present invention, in which the images a1 and b1 have different magnifications;
FIG. 2 is a metallographic structure obtained in example 2 of the present invention, in which the images a2 and b2 have different magnifications;
FIG. 3 is a metallographic structure obtained in example 3 of the present invention, in which the images a3 and b3 have different magnifications;
FIG. 4 is a metallographic structure obtained in example 4 of the present invention, in which the images a4 and b4 have different magnifications.
Detailed Description
the invention is further explained below with reference to the drawings and examples.
the invention provides high-entropy alloy powder for a laser cladding high-temperature sealing coating, which comprises the following components in percentage by weight: 22.0 to 25.0 percent of nickel, 22.0 to 24.0 percent of chromium, 20 to 24.0 percent of iron, 3.5 to 4.9 percent of aluminum, 0.1 to 0.5 percent of hafnium, 0.4 to 1.0 percent of rare earth yttrium, carbon A, oxygen B and the balance of cobalt, wherein A is less than 0.01 and B is less than 0.05.
The invention also provides a method for preparing the high-entropy alloy powder, which comprises the following process steps: burdening → suspension smelting → vacuum gas atomization → drying → sieving.
The specific process steps are as follows:
(1) Preparing materials: preparing raw materials of a nickel source, a cobalt source, a chromium source, an iron source, an aluminum source, a hafnium source and an yttrium source according to the proportion of target components;
(2) Suspension smelting: putting the prepared materials into a magnesium oxide crucible, and putting the magnesium oxide crucible into a vacuum suspension smelting furnace; the melting temperature is 1400-1600 ℃, the carbon content is controlled to meet the requirement, and the tapping temperature is controlled to be 1300-1500 ℃ after the components are adjusted to be qualified in front of the furnace;
(3) Vacuum gas atomization: atomizing the alloy melt prepared in the step (2) to prepare alloy powder, wherein an atomizing medium is argon, and the atomizing pressure is 4.5-10 MPa;
(4) And (3) drying: drying the alloy powder in the step (3) by using a far infrared dryer, wherein the drying temperature is 200-250 ℃;
(5) Screening: and sieving the dried alloy powder by a powder sieving machine to obtain powder with the granularity range of 100 meshes-350 meshes as finished product powder, namely the required high-entropy alloy powder.
Wherein, the raw materials used in the invention are all commercial products.
the iron source can be pure iron, and in the embodiment of the invention, the iron content of the iron source is more than or equal to 99.99%.
the nickel source can be pure nickel, and in the embodiment of the invention, the nickel content of the nickel source is more than or equal to 99.96%.
The cobalt source can be pure cobalt, and in the embodiment of the invention, the cobalt content of the cobalt source is more than or equal to 99.98%.
The chromium source can be pure chromium, and in the embodiment of the invention, the chromium content of the chromium source is more than or equal to 99.95%.
The hafnium source can be pure hafnium, and in the embodiment of the present invention, the hafnium content of the hafnium source is greater than or equal to 99.7%.
The yttrium source can be pure yttrium, and in the embodiment of the invention, the yttrium content of the yttrium source is more than or equal to 99.7%.
the aluminum source can be pure aluminum, and in the embodiment of the invention, the aluminum content of the aluminum source is more than or equal to 99.5%.
the sources of the above nickel source, cobalt source, chromium source, iron source, aluminum source, hafnium source and yttrium source are not limited, and as the sources, there can be mentioned, for example, aurora 1# nickel and aurora 1# cobalt.
The suspension smelting furnace adopted by the invention has the following specifications: 0.05T of capacity, 120 kilowatt of rated power, 2.5 KHz of frequency, 6.7X 10-3mmHg of ultimate vacuum degree, 1700 ℃ of rated temperature, 1.5 tons of weight and 220V of control voltage. The invention adopts the suspension smelting furnace, can improve the uniformity of the alloy solution and reduce segregation.
The specification of the vacuum gas atomization device adopted by the invention is as follows: the capacity is 0.05T, the rated power is 120 kilowatt, the frequency is 2.5 KHz, and the ultimate vacuum degree is 6.7X 10-3 mmHg.
The components of the high-entropy alloy powder prepared by the steps are tested by adopting the standard of GB/T223 chemical analysis method for steel and alloy, and the detection result comprises the following components in percentage by weight: 22.0 to 25.0 percent of nickel, 22.0 to 24.0 percent of chromium, 20 to 24.0 percent of iron, 3.5 to 4.9 percent of aluminum, 0.1 to 0.5 percent of hafnium, 0.4 to 1.0 percent of rare earth yttrium, carbon A, oxygen B and the balance of cobalt, wherein A is less than 0.01 and B is less than 0.05.
after cooling the high-entropy alloy powder to room temperature, carrying out laser cladding treatment on the surface of the gate to prepare a high-temperature sealing coating, wherein the laser cladding treatment adopts a laser hollow internal powder feeding forming technology and comprises the following steps:
(1) Aligning a laser head of a laser to the surface of the machine brake;
(2) uniformly feeding powder for laser cladding to the surface of a gate aligned with a laser head, wherein a laser beam is in a hollow ring shape, the powder for laser cladding is positioned in the ring shape of the laser beam, the laser beam surrounds the powder for laser cladding, the powder beam formed by the powder for laser cladding in the powder feeding process is always coaxial with the laser beam, and the powder feeding speed is 8-12 g/min;
(3) the laser head emits laser to melt the powder for laser cladding, reactants generated by melting cover the surface of the gate to form a cladding layer, the power of the laser is 800-1000W, and the defocusing amount is 0-3 mm;
(4) The laser head scans the preset range of the surface of the machine brake at the scanning speed of 6-10mm/s, the scanning path of the laser head moves from a starting point to a specified length along a certain preset linear direction at first, the laser is closed, the laser head moves to the next starting point, the laser is started to scan again, the laser scans once to form a single-channel cladding layer, the steps are repeated, the previous-channel cladding layer covering part of the current-channel cladding layer is formed, the overlap joint of the current-channel cladding layer and the previous-channel cladding layer is formed, and therefore continuous cladding of the preset range of the surface of the machine brake is achieved, and the required high-temperature sealing coating is obtained.
The laser hollow internal powder feeding forming technology is used, light beam transformation is accurate and easy to control, powder clustering performance is good, whole-process coupling of the powder is achieved, surface defect self-healing is achieved, surface quality is good, multiple powder beams are broken through, convergence interference, large splashing radiation, defocusing and inclination sensitivity are achieved, in addition, peripheral shielding gas has a good protection effect on a molten pool, and high-temperature oxidation and slag inclusion are avoided. In the laser cladding process of the high-temperature sealing coating, the annular temperature field of the technology can reduce the solidification speed and the temperature gradient of a metal molten pool, is also beneficial to improving the thermal stress and the residual stress and avoids the generation of micro-cracks. The laser hollow optical internal powder feeding technology has low dilution rate in the cladding process, basically does not change the components of alloy powder, and effectively improves the protection effect of the alloy.
after the high-temperature sealing coating is ground, polished and corroded, a metallographic structure is observed, and the high-temperature sealing coating contains a gamma- (Co, Ni and Cr) structure and a large amount of Y2O3 precipitated phases.
The effects on the elements in the high-entropy alloy powder of the present invention are explained as follows:
(1) cobalt, nickel, chromium, iron and aluminum elements can form a stable gamma- (Co, Ni and Cr) solid solution, fine and dispersed Y2O3 is precipitated at the subgrain boundary, and the dispersed Y2O3 plays a role in strengthening and can effectively improve the wear resistance of the high-temperature sealing coating; moreover, the structure of the gamma- (Co, Ni, Cr) solid solution is compact, and the thermal stability is excellent, so that the high-temperature sealing coating has good high-temperature frictional wear performance and high-temperature oxidation resistance;
(2) the hafnium element can effectively improve the high-temperature resistance of the high-temperature sealing coating;
(3) the contents of the nickel, the chromium and the iron in the invention are close, and the ratio of the expensive nickel element to the expensive cobalt element is relatively low, so that the production cost can be effectively reduced.
(4) The proportion of the high-entropy alloy powder in the invention ensures that the prepared high-temperature sealing coating has moderate hardness compared with a cobalt-based high-temperature sealing coating obtained by thermal spraying in the prior art, and the blade is not easy to wear in the process of contacting with the blade tip.
(5) The alloy powder for laser cladding has proper granularity selection, good fluidity in the laser cladding process, uniform powder delivery, and rapid melting without ablation loss in the laser cladding process.
the following are specific examples:
Example 1
The target composition of the cobalt-based high-temperature seal coating comprises, by weight, 22% of Ni, 22% of Cr, 20% of Fe, 32% of Co, 3.5% of Al, 0.5% of Y and 0.5% of Hf;
Mixing pure nickel, pure chromium, pure cobalt, pure iron, pure yttrium, pure aluminum and pure hafnium according to the target components; putting the prepared materials into a magnesium oxide crucible, and putting the magnesium oxide crucible into a vacuum suspension smelting furnace; the melting temperature is 1500 ℃, the carbon content is controlled to meet the requirement, and the tapping temperature is 1380 ℃ after the components are adjusted to be qualified in front of the furnace; atomizing the alloy melt to prepare alloy powder, wherein the atomizing medium is argon, and the atomizing pressure is 6 MPa; drying the alloy powder by a far infrared dryer at the drying temperature of 210 ℃; then the powder with the granularity range of 100 meshes to 350 meshes is sieved out by a powder sieving machine to be used as finished powder.
cooling the finished powder to room temperature, and then carrying out laser cladding treatment on the surface of the brake: the laser hollow optical internal powder feeding forming technology is adopted, the laser power is 800W, the scanning speed is 8mm/s, the defocusing amount is 1mm, and the powder feeding amount is 10 g/min.
the high-temperature sealing coating prepared by the method is ground, polished and corroded, and then metallographic structure observation is carried out, and an obtained metallographic structure picture is shown in fig. 1, and as can be seen from fig. 1, the high-temperature sealing coating prepared by the embodiment 1 of the invention contains a gamma- (Co, Ni and Cr) solid solution, and fine and dispersed Y2O3 is precipitated at a subboundary. The components and high-temperature performance of the high-temperature sealing coating prepared in example 1 of the present invention were tested, and the test results are shown in table 1, where table 1 shows the components and high-temperature performance test results of the high-temperature sealing coating provided in each example of the present invention.
Example 2
Different from the method in example 1, the high-temperature sealing coating prepared according to the method in example 1 is prepared according to the following target components of the high-temperature sealing coating, and the target components of the high-temperature sealing coating comprise, by weight: 23% Ni, 23% Cr, 21% Fe, 28% Co, 4.5% Al, 0.5% Y and 0.2% Hf; in the preparation process of the high-entropy alloy powder, the melting temperature is 1600 ℃, the tapping temperature is 1450 ℃, the atomization pressure is 4.5MPa, and the drying temperature of a far infrared dryer is 250 ℃; in the laser cladding process, the laser power is 1000W, the scanning speed is 10mm/s, the defocusing amount is 2mm, and the powder feeding amount is 12 g/min. FIG. 2 is a structural picture of the high-temperature sealing coating prepared in example 2 of the present invention.
the compositions of the high temperature seal coatings prepared in example 2 of the present invention were tested according to the method described in example 1 and the results of the high temperature performance tests are shown in table 1.
Example 3
The high-temperature sealing coating prepared according to the method described in the embodiment 1 is different from the embodiment 1 in that the following target components of the high-temperature sealing coating are proportioned, and the target components of the high-temperature sealing coating comprise the following components in percentage by weight: 25% Ni, 24% Cr, 24% Fe, 21.1% Co, 4.9% Al, 1.0% Y, and 0.4% Hf; in the preparation process of the high-entropy alloy powder, the melting temperature is 1450 ℃, the tapping temperature is 1300 ℃, the atomization pressure is 8MPa, and the drying temperature of a far infrared dryer is 230 ℃; in the laser cladding process, the laser power is 900W, the scanning speed is 7.5mm/s, the defocusing amount is 1.8mm, and the powder feeding amount is 9 g/min. FIG. 3 is a structural picture of the high temperature sealing coating prepared in example 3 of the present invention.
the compositions of the high temperature seal coatings prepared in example 3 of the present invention were tested according to the method described in example 1 and the results of the high temperature performance tests are shown in table 1.
Example 4
According to the difference of example 2, CaF2 powder is added to the prepared high-entropy alloy powder through a ball milling method, the mass of CaF2 powder accounts for 10% of the mass of the high-entropy alloy powder, and CaF2 is used for improving the solidification structure form.
According to the method described in the embodiment 1, the metallographic structure of the high-temperature sealing coating prepared in the embodiment 4 of the invention is observed, and the observation result is shown in fig. 4, wherein the substructure type is changed from a net structure to a strip structure, and the high-temperature frictional wear form is changed from adhesive wear to abrasive wear, so that the high-temperature frictional wear performance of the high-temperature sealing coating is improved.
the compositions of the high temperature seal coatings prepared in example 4 of the present invention were tested according to the method described in example 1 and the results of the high temperature performance tests are shown in Table 1.
Table 1 compositions and high temperature performance test results of high temperature seal coating alloy powders provided by various embodiments of the present invention.
TABLE 1
As can be seen from Table 1, the high-temperature sealing coating prepared by the embodiment of the invention has better high-temperature frictional wear performance and high-temperature oxidation resistance, and the hardness of the high-temperature sealing coating obtained by the invention is more moderate compared with the prior art, so that the blade is not easily worn in the process of contacting with the blade tip.
From the above examples, it can be known that, when the high-entropy alloy powder prepared by the invention is used for preparing a high-temperature sealing coating by adopting a laser cladding method, stable gamma- (Co, Ni, Cr) solid solution can be formed due to cobalt, nickel, chromium, iron and aluminum elements in the high-entropy alloy powder, and fine and dispersed Y2O3 is precipitated at the subboundary. The gamma- (Co, Ni, Cr) solid solution with compact structure and excellent thermal stability has good high-temperature frictional wear performance and high-temperature oxidation resistance, can further improve the high-temperature frictional wear performance by changing the form of the substructure, and is particularly suitable for high-temperature sealing coatings of engines and the like.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. The high-temperature sealing coating for the gate is characterized by being prepared by a laser cladding method, wherein the powder for laser cladding comprises high-entropy alloy powder, and the high-entropy alloy powder comprises the following components in percentage by weight:
22.0% -25.0% of nickel;
22.0% -24.0% of chromium;
20% -24.0% of iron;
3.5 to 4.9 percent of aluminum;
0.1 to 0.5 percent of hafnium;
0.4 to 1.0 percent of rare earth yttrium;
carbon A%, A < 0.01;
b% of oxygen, B < 0.05;
The balance of cobalt;
The powder for laser cladding also comprises CaF2 powder which is uniformly mixed with the high-entropy alloy powder, the mass of the CaF2 powder accounts for 5-30% of the mass of the high-entropy alloy powder,
The thickness of the sealing coating is 0.3-0.7 mm.
2. The high-temperature seal coating for the brake of claim 1, wherein the laser cladding powder comprises, in weight percent: 23.0 percent of nickel, 22.5 percent of chromium, 22.0 percent of iron, 4.2 percent of aluminum, 0.3 percent of hafnium, 0.6 percent of rare earth yttrium, A percent of carbon, B percent of oxygen and the balance of cobalt, wherein A is less than 0.01, and B is less than 0.05.
3. The high-temperature seal coating for the brake of claim 1, wherein the laser cladding powder comprises, in weight percent: 24.5% of nickel, 23.0% of chromium, 23.5% of iron, 4.0% of aluminum, 0.4% of hafnium, 0.5% of rare earth yttrium, A% of carbon and B% of oxygen, wherein the balance is cobalt, A is less than 0.01, B is less than 0.05, the powder for laser cladding is composed of the high-entropy alloy powder and CaF2 powder, and the mass of the CaF2 powder accounts for 10% of the mass of the high-entropy alloy powder.
4. The high-temperature seal coating for the brake of claim 1, wherein the laser cladding powder comprises, in weight percent: 23.5% of nickel, 22.8% of chromium, 21.5% of iron, 4.2% of aluminum, 0.3% of hafnium, 0.6% of rare earth yttrium, A% of carbon and B% of oxygen, wherein the balance is cobalt, A is less than 0.01, B is less than 0.05, the powder for laser cladding is composed of the high-entropy alloy powder and CaF2 powder, and the mass of the CaF2 powder accounts for 15% of the mass of the high-entropy alloy powder.
5. a high temperature seal coating for a machine brake according to any one of claims 1 to 4, wherein: the granularity of the high-entropy alloy powder is 100-350 meshes.
6. A method for preparing a high temperature seal coating according to any one of claims 1 to 5, comprising the steps of:
(1) Aligning a laser head of a laser to the surface of the machine brake;
(2) uniformly feeding the powder for laser cladding to the surface of the machine brake aligned to the laser head;
(3) the laser head emits laser to melt the powder for laser cladding, and reactants generated by melting cover the surface of the gate to form a cladding layer;
(4) And the laser head scans in a preset range on the surface of the machine brake to realize continuous cladding on the surface in the preset range, and the high-temperature sealing coating is obtained.
7. A method for preparing a high temperature seal coating according to claim 6, wherein: in the step (2), the laser beam is in a hollow ring shape, the powder for laser cladding is located in the ring shape of the laser beam, the laser beam surrounds the powder for laser cladding, and the powder beam formed by the powder for laser cladding in the powder feeding process is always coaxial with the laser beam.
8. a method for producing a high temperature seal coating according to claim 7, wherein: the laser head is in the scanning path of the gate surface preset range is that the laser head moves for a specified length from a starting point along a certain preset linear direction at first, the laser is closed, the laser head moves to a next starting point, the laser is started to scan again, the laser scans for one time to form a single-channel cladding layer, the steps are repeated, a front-channel cladding layer covering a part of the current-channel cladding layer is covered, and the lap joint of the current-channel cladding layer and the front-channel cladding layer is formed.
9. The method as claimed in any one of claims 6 to 8, wherein the laser power is 800-1000W, the laser scanning speed is 6-10mm/s, the defocusing amount is 0-3mm, and the powder feeding rate is 8-12 g/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710857022.3A CN107740094B (en) | 2017-09-18 | 2017-09-18 | High-temperature sealing coating for machine brake and preparation method thereof |
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| CN201710857022.3A CN107740094B (en) | 2017-09-18 | 2017-09-18 | High-temperature sealing coating for machine brake and preparation method thereof |
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| CN107740094A CN107740094A (en) | 2018-02-27 |
| CN107740094B true CN107740094B (en) | 2019-12-06 |
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| CN112048696B (en) * | 2020-09-10 | 2022-09-23 | 中国航发沈阳黎明航空发动机有限责任公司 | Double-layer anti-oxidation bonding bottom layer high-temperature sealing coating and preparation method thereof |
| CN112210775B (en) * | 2020-10-09 | 2022-12-02 | 中国科学院微电子研究所 | Part coating preparation device, part coating preparation method and terminal device |
| CN113293370A (en) * | 2021-05-28 | 2021-08-24 | 皖西学院 | High-entropy alloy coating for laser cladding of aluminum alloy surface and preparation method |
| CN114875398B (en) * | 2022-04-07 | 2024-04-19 | 西安建筑科技大学 | Rare earth element modified wear-resistant refractory high-entropy alloy coating and preparation method thereof |
| CN114951633B (en) * | 2022-05-05 | 2023-12-12 | 苏州大学 | Super wear-resistant and corrosion-resistant coating of high-aluminum high-entropy alloy and preparation method thereof |
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| CN106929846A (en) * | 2017-04-22 | 2017-07-07 | 南京工程学院 | Laser cladding new A lFeCrCoNiTi alloy coats and preparation method thereof |
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