CN115975407B - Nickel-based alloy surface photoelastic glass coating and preparation method thereof - Google Patents
Nickel-based alloy surface photoelastic glass coating and preparation method thereof Download PDFInfo
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- CN115975407B CN115975407B CN202211666881.1A CN202211666881A CN115975407B CN 115975407 B CN115975407 B CN 115975407B CN 202211666881 A CN202211666881 A CN 202211666881A CN 115975407 B CN115975407 B CN 115975407B
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- 239000011521 glass Substances 0.000 title claims abstract description 102
- 239000000956 alloy Substances 0.000 title claims abstract description 98
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 98
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 238000000576 coating method Methods 0.000 title claims abstract description 88
- 239000011248 coating agent Substances 0.000 title claims abstract description 84
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002002 slurry Substances 0.000 claims description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 36
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 36
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 239000000843 powder Substances 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000002994 raw material Substances 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 19
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 18
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 18
- 229910052810 boron oxide Inorganic materials 0.000 claims description 18
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 18
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 18
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 18
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 18
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 18
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 18
- 239000000377 silicon dioxide Substances 0.000 claims description 18
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 18
- 235000012239 silicon dioxide Nutrition 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 16
- 238000010791 quenching Methods 0.000 claims description 15
- 230000000171 quenching effect Effects 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 14
- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- 238000002425 crystallisation Methods 0.000 claims description 11
- 230000008025 crystallization Effects 0.000 claims description 11
- 230000009477 glass transition Effects 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 5
- 238000000498 ball milling Methods 0.000 claims description 3
- 239000011449 brick Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000006060 molten glass Substances 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 239000006012 monoammonium phosphate Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 7
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- 239000000126 substance Substances 0.000 abstract description 5
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- 239000011159 matrix material Substances 0.000 description 22
- 239000000463 material Substances 0.000 description 15
- 239000008367 deionised water Substances 0.000 description 13
- 229910021641 deionized water Inorganic materials 0.000 description 13
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- 238000011056 performance test Methods 0.000 description 3
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- 230000003287 optical effect Effects 0.000 description 2
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- 206010066054 Dysmorphism Diseases 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000011835 investigation Methods 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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Abstract
The invention discloses a nickel-based alloy surface photoelastic glass coating and a preparation method thereof, wherein the photoelastic glass coating is arranged on an aeroengine blade and is used for detecting stress distribution in the blade, and the thermal expansion coefficient of the prepared coating is up to 16.68 multiplied by 10 ‑6 /℃ ‑1 Phosphate glass with high transparency and temperature resistance reaching 416 ℃; the glass coating has high temperature resistance, and can easily realize the measurement of the stress of the blade at high temperature; the combination of the glass coating and the blade is chemical combination, and elements between the glass coating and the blade are mutually diffused and permeated to form a transition layer, so that the combination degree is better, the deformation is more consistent, and the accuracy of a calculation result is high; in addition, the coating can be prepared on the surface of the blade with a certain radian, and is suitable for the special-shaped piece blade.
Description
Technical Field
The invention belongs to the technical field of preparation of glass coatings on metal surfaces, and relates to a nickel-based alloy surface photoelastic glass coating and a preparation method thereof.
Background
At present, the technology for measuring the stress of the aero-engine blade is slow in development, and stays in a test stage, so that the stress of the aero-engine blade cannot be measured under the condition of simulating the real working environment of the blade. The high temperature environment of the blade during working and the load born during high-speed rotation have great influence on the internal stress of the blade, and the internal stress cannot be ignored. Compared with the stress measurement methods of a plurality of aero-engine blades, the photoelastic coating method can realize full-field and non-contact measurement, wherein the full-field refers to the measurement of the stress of the whole surface of the engine blade, and the non-contact measurement can realize the measurement of the stress under the condition of simulating the rotation of the blade. The common coating medium used in photoelastic coating method is transparent epoxy resin, plastic, glass and the like, when the transparent medium is subjected to a certain load, the transparent medium can generate double refraction effect on incident light, one beam of light is incident to one point of the medium, the beam of light can be decomposed into two beams of light along the principal stress direction of the point, the two beams of light have the same frequency and constant optical path difference, the loaded transparent medium is placed into a special light path, the vibration directions of the two beams of light are consistent to generate interference fringes, and the stress in the transparent medium is calculated by collecting fringe information. However, the coating material used at present is an organic material patch such as epoxy resin, which is stuck to the blade for measurement. On one hand, the epoxy resin is resistant to temperature difference, only 200 ℃, and the high-temperature working environment of the blade cannot be simulated; on the other hand, the mode of paster is difficult to be applied to on the dysmorphism piece, considers that the blade surface has certain radian, can't be good coincide with the paster.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a nickel-based alloy surface photoelastic glass coating and a preparation method thereof, so as to solve the problems that the high-temperature working environment of a blade cannot be simulated and the surface of the blade is difficult to be well matched with the surface of the blade when epoxy resin is used as an organic material patch in the prior art.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a photoelastic glass coating on the surface of a nickel-based alloy is characterized in that the glass coating is attached to the surface of a blade of the nickel-based alloy, and the thermal expansion coefficient of the glass coating is 13.57 multiplied by 10 -6 /℃ -1 ～16.68×10 -6 /℃ -1 ；
The glass coating consists of the following raw materials in percentage by mass: 35-45% of ammonium dihydrogen phosphate, 20-30% of aluminum oxide, 1-10% of boron oxide, 10-20% of sodium carbonate, 10-20% of potassium carbonate, 1-10% of lithium carbonate, 1-10% of silicon dioxide and 1-10% of calcium fluoride, wherein the mass sum of all components is 100%.
The invention further improves that:
preferably, the temperature resistance of the glass coating is 407-416 ℃, the glass transition temperature is 407-416 ℃, and the glass crystallization temperature is 510-520 ℃.
Preferably, the raw materials comprise 35% -45% of ammonium dihydrogen phosphate, 20% -30% of aluminum oxide, 1% -10% of boron oxide, 10% -20% of sodium carbonate, 10% -20% of potassium carbonate, 1% -10% of lithium carbonate, 1% -10% of silicon dioxide, 1% -10% of calcium fluoride and 100% of the total mass of all the components.
Preferably, the raw materials comprise 40% of ammonium dihydrogen phosphate, 20% of aluminum oxide, 6% of boron oxide, 12% of sodium carbonate, 12% of potassium carbonate, 4% of lithium carbonate, 2% of silicon dioxide and 4% of calcium fluoride.
Preferably, the nickel-base alloy is GH738 nickel-base alloy.
The preparation method of the photoelastic glass coating on the surface of the nickel-based alloy comprises the following steps:
step 1, weighing raw materials, uniformly mixing, grinding, sieving, melting, water quenching molten glass, and ball milling glass particles to a micron level to obtain micron-sized glass powder;
and 2, polishing the nickel-based alloy blade, mixing micron-sized glass powder with water to form slurry, coating the slurry on the surface of the nickel-based alloy blade, drying, preserving heat, taking out the heat-preserved blade, and performing air quenching to finish the coating preparation.
Preferably, in the step 1, the melting temperature is 1100-1300 ℃, and the melting time is 10-30 min.
Preferably, in the step 2, the drying temperature is 20-70 ℃; the heat preservation temperature is 700-1000 ℃ and the heat preservation time is 1-10 min.
Preferably, in the step 2, the mixing volume ratio of the glass powder to the water is 9:1-6:4.
Preferably, the air quenching process is as follows: and (3) placing the pressed sheet coated with the coating on a normal-temperature refractory brick, carrying out air quenching for 5s, then contacting with a normal-temperature iron block, and cooling to finish the preparation of the coating.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a nickel-based alloy surface photoelastic glass coating, which is arranged on an aeroengine blade and is used forThe stress distribution in the blade is detected, and the thermal expansion coefficient of the prepared coating is up to 16.68 multiplied by 10 -6 /℃ -1 Phosphate glass with high transparency and temperature resistance reaching 416 ℃; the glass coating has high temperature resistance, and can easily realize the measurement of the stress of the blade at high temperature; the combination of the glass coating and the blade is chemical combination, and elements between the glass coating and the blade are mutually diffused and permeated to form a transition layer, so that the combination degree is better, the deformation is more consistent, and the accuracy of a calculation result is high; in addition, the coating can be prepared on the surface of the blade with a certain radian, and is suitable for the special-shaped piece blade. The photoelastic test can be carried out on the nickel-based alloy with the photoelastic coating by using the optical system, when the alloy is loaded, the strain is generated on the surface of the alloy and synchronously transferred to the coating, the strain state of the alloy can be obtained by detecting the strain state of the coating, namely polarized light emitted from the system is incident to the surface of the alloy through the coating and then reflected, in the process, the incident light and the reflected light are subjected to double refraction due to the photoelastic of the coating, so that the emergent light has a certain phase difference, the emergent light is interfered by the effect of a polarizer in the system, rich fringe images can appear, the fringe images are obtained by using a high-speed camera, and the fringe images are processed by using a program, so that the stress (strain) field distribution of the nickel-based alloy can be analyzed.
One of the embodiments of the invention is to disclose a preparation method of a photoelastic glass coating on the surface of a nickel-based alloy, which adopts a fusion-water quenching method, takes GH738 nickel-based alloy as a matrix, and adopts a slurry spraying-sintering-quick cooling process to prepare the photoelastic glass coating with good combination, thin and uniform thickness and high transparency on the surface of the nickel-based alloy.
Drawings
FIG. 1 is a flow chart of the preparation of the photoelastic coating of the present invention;
FIG. 2 is a graph of the thermal expansion curve of the H738 nickel-based alloy of the present invention;
FIG. 3 is a DSC curve of a phosphate glass of the present invention;
FIG. 4 is a graph of the thermal expansion of a phosphate glass according to the present invention;
FIG. 5 is an SEM image of the interface between the substrate and glass;
FIG. 6 is an EDX line scan at an interface;
FIG. 7 is a sample view of a photoelastic glass coating of the present invention;
FIG. 8 is a drawing showing a sample stretch break according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
in the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention prepares transparent, uniform and well-combined photoelastic glass coating on the surface of the blade. The key to good bonding of the coating to the substrate is the matching of the coefficients of thermal expansion. The blade material is mostly nickel-based alloy, GH738 alloy is selected as matrix, and the thermal expansion coefficient is 14.00 multiplied by 10 -6 /℃ -1 . Through investigation, the phosphate glass has a thermal expansion coefficient which meets the matching requirement, and the glass has extremely high transparency as optical glass. The invention relates to phosphate glass which is used as photoelastic glass powder. The glass coating is prepared into slurry, and the slurry is uniformly coated on the surface of the alloy for sintering, and through a special cooling process, the glass coating is ensured to have certain mechanical property and less residual stress and is prevented from generatingAnd (3) performing crystallization, and keeping high light transmittance to finally obtain a finished product suitable for photoelastic stress test.
One embodiment of the invention discloses a nickel-based alloy surface photoelastic glass coating, wherein the thermal expansion coefficient of the glass coating is 13.57 multiplied by 10 -6 /℃ -1 ～16.68×10 -6 /℃ -1 The thermal expansion coefficient of the material is close to that of a metal material of an aircraft engine blade, the temperature resistance is 407-416 ℃, and the material can be used as a photoelastic glass coating material for measuring the stress of the blade by a photoelastic coating method. The coating is well combined with a matrix (the tensile strength reaches 18.08 MPa), the coating has high transparency and uniform coating surface, the coating can deform together with the matrix alloy under a certain load, and the nickel base is preferably GH738 nickel base alloy. Preferably, the coating thickness is 0.1 to 0.5mm.
Furthermore, the photoelastic glass coating has high transparency, no crystallization, the glass transition temperature is 407-416 ℃, and the chemical and physical properties of the glass are stable and are not easily influenced by the outside; the glass crystallization initial temperature is 510-520 ℃, and the prepared glass has excellent performance.
One of the embodiments of the present invention discloses a preparation method of the photoelastic glass coating, referring to fig. 1, the preparation method comprises the following steps:
step 1, weighing and uniformly mixing raw materials in proportion, grinding the raw materials, putting the raw materials into a crucible after passing through a 30-mesh screen, melting the raw materials for 10-30 min at 1100-1300 ℃, taking out the raw materials for water quenching, drying the obtained glass particles, and crushing and ball-milling the glass particles to micron-sized powder.
Preferably, the melting temperature is 1100-1200 ℃ and the melting time is 10-15 min.
Preferably, the melting temperature is 1130 ℃ and the melting time is 12min.
And 2, selecting GH738 nickel base alloy as a matrix, polishing the surface until the roughness is 1-10 mu m, mixing glass powder and deionized water into slurry according to the proportion of 9:1-6:4, uniformly coating the slurry on the surface of the alloy, vibrating, drying at 20-70 ℃, keeping the temperature at 700-1000 ℃ for 1-10 min after drying to remove water, enabling glass in the slurry to be in a molten state, enabling the slurry to be attached to the surface of a blade, taking out and quenching, controlling the cooling speed of the slurry, and cooling the slurry to below the glass transition temperature.
Preferably, the air quenching process is to take out and contact with the normal-temperature iron block, and rapidly cool.
Preferably, the surface is polished to have the roughness of 3-8 mu m, glass powder and deionized water are mixed into slurry according to the proportion of 8:2-6:4, the slurry is uniformly coated on the surface of the alloy, and the alloy is dried at the temperature of 40-60 ℃, is kept at the temperature of 800-950 ℃ for 1-5 min after being dried, is taken out to be contacted with an iron block at normal temperature, and is rapidly cooled.
Preferably, the temperature is kept at 800-900 ℃ for 3-5 min, and after being taken out, the steel is firstly placed on a refractory brick at normal temperature for air quenching for 5s, and then placed on an iron block at normal temperature for rapid cooling.
Preferably, the surface is polished to have the roughness of 5 mu m, glass powder and deionized water are mixed into slurry according to the proportion of 7:3, the slurry is uniformly coated on the surface of the alloy, and the alloy is dried at 40 ℃, is kept at 900 ℃ for 4min after being dried, is taken out to be in contact with an iron block at normal temperature, and is rapidly cooled.
Preferably, the stress anneal is performed after cooling. Heat preservation is carried out at 400 ℃ for 1h, and then the temperature is reduced to room temperature along with the furnace.
The raw material powder in the process comprises 35-45% of ammonium dihydrogen phosphate, 20-30% of aluminum oxide, 1-10% of boron oxide, 10-20% of sodium carbonate, 10-20% of potassium carbonate, 1-10% of lithium carbonate, 1-10% of silicon dioxide and 1-10% of calcium fluoride.
Preferably, 35 to 40 percent of ammonium dihydrogen phosphate, 25 to 30 percent of aluminum oxide, 5 to 10 percent of boron oxide, 10 to 15 percent of sodium carbonate, 10 to 15 percent of potassium carbonate, 1 to 5 percent of lithium carbonate, 1 to 5 percent of silicon dioxide and 1 to 5 percent of calcium fluoride.
Preferably, 35% of ammonium dihydrogen phosphate, 29% of alumina, 7% of boron oxide, 11% of sodium carbonate, 11% of potassium carbonate, 3% of lithium carbonate, 1% of silicon dioxide and 3% of calcium fluoride.
The following is a further explanation in connection with specific examples:
example 1
35% of ammonium dihydrogen phosphate, 23% of aluminum oxide, 7% of boron oxide, 13% of sodium carbonate, 13% of potassium carbonate, 4% of lithium carbonate, 2% of silicon dioxide and 3% of calcium fluoride.
The raw materials are weighed according to a certain proportion and uniformly mixed, ground and put into a crucible after passing through a 30-mesh screen, melted for 10min at 1130 ℃, taken out and quenched by water, and the obtained glass particles are dried, crushed and ball-milled to micron-sized powder. GH738 nickel-based alloy is selected as a matrix, the surface is polished to have a roughness of 5 mu m, and glass powder and deionized water are mixed according to a ratio of 7:3 mixing the materials in proportion to form slurry, uniformly coating the slurry on the surface of the alloy, drying the alloy at 50 ℃, preserving the heat for 5min at 900 ℃, taking out the alloy, contacting with an iron block at normal temperature, and rapidly cooling the alloy.
Example 2
35% of ammonium dihydrogen phosphate, 25% of aluminum oxide, 7% of boron oxide, 11% of sodium carbonate, 13% of potassium carbonate, 4% of lithium carbonate, 2% of silicon dioxide and 3% of calcium fluoride.
The raw materials are weighed according to a certain proportion and uniformly mixed, ground and put into a crucible after passing through a 30-mesh screen, melted for 10min at 1130 ℃, taken out and quenched by water, and the obtained glass particles are dried, crushed and ball-milled to micron-sized powder. GH738 nickel-based alloy is selected as a matrix, the surface is polished to have a roughness of 5 mu m, and glass powder and deionized water are mixed according to a ratio of 7:3 mixing the materials in proportion to form slurry, uniformly coating the slurry on the surface of the alloy, drying the alloy at 50 ℃, preserving the heat for 5min at 900 ℃, taking out the alloy, contacting with an iron block at normal temperature, and rapidly cooling the alloy.
Example 3
35% of ammonium dihydrogen phosphate, 27% of aluminum oxide, 7% of boron oxide, 11% of sodium carbonate, 11% of potassium carbonate, 4% of lithium carbonate, 2% of silicon dioxide and 3% of calcium fluoride.
The raw materials are weighed according to a certain proportion and uniformly mixed, ground and put into a crucible after passing through a 30-mesh screen, melted for 10min at 1130 ℃, taken out and quenched by water, and the obtained glass particles are dried, crushed and ball-milled to micron-sized powder. GH738 nickel-based alloy is selected as a matrix, the surface is polished to have a roughness of 5 mu m, and glass powder and deionized water are mixed according to a ratio of 7:3 mixing the materials in proportion to form slurry, uniformly coating the slurry on the surface of the alloy, drying the alloy at 50 ℃, preserving the heat for 5min at 900 ℃, taking out the alloy, contacting with an iron block at normal temperature, and rapidly cooling the alloy.
Example 4
35% of ammonium dihydrogen phosphate, 29% of aluminum oxide, 7% of boron oxide, 11% of sodium carbonate, 11% of potassium carbonate, 3% of lithium carbonate, 1% of silicon dioxide and 3% of calcium fluoride.
The raw materials are weighed according to a certain proportion and uniformly mixed, ground and put into a crucible after passing through a 30-mesh screen, melted for 10min at 1130 ℃, taken out and quenched by water, and the obtained glass particles are dried, crushed and ball-milled to micron-sized powder. GH738 nickel-based alloy is selected as a matrix, the surface is polished to have a roughness of 5 mu m, and glass powder and deionized water are mixed according to a ratio of 7:3 mixing the materials in proportion to form slurry, uniformly coating the slurry on the surface of the alloy, drying the alloy at 50 ℃, preserving the heat for 5min at 900 ℃, taking out the alloy, contacting with an iron block at normal temperature, and rapidly cooling the alloy.
Performance test: the glasses of examples 1 to 4 were subjected to a performance test, wherein T g T is the glass transition temperature p For crystallization peak temperature, α is the coefficient of thermal expansion.
Table 1 basic data for example glasses
| Examples | 1 | 2 | 3 | 4 |
| Glass forming condition | Transparent and transparent | Transparent and transparent | Transparent and transparent | Transparent and transparent |
| T g (℃) | 409 | 416 | 411 | 407 |
| T p (℃) | 566 | 594 | 579 | 557 |
| α(×10 -6 /℃ -1 ) | 16.68 | 15.36 | 16.06 | 13.57 |
The glass prepared by the method is transparent, has no crystallization, has the glass transition temperature reaching 390 ℃, has stable chemical and physical properties, and is not easily influenced by the outside; the glass crystallization initial temperature is 510-520 ℃, the thermal expansion coefficient is 16.68-13.57, and the prepared glass has excellent performance. And after being combined with the matrix, the glass has good combination and high transparency.
The performance test results of the photoelastic glass coating prepared by the embodiment of the invention are as follows:
referring to FIG. 2, a GH738 nickel-based alloy matrix has a thermal expansion coefficient of 14.00×10 -6 /℃ -1 Based on this, the thermal expansion coefficient of the glass is adjusted to match the matrix by changing the glass composition.
Referring to FIG. 3, there is a DSC chart of the glass prepared in example 4. The glass transition temperature of the glass is 407 ℃, the crystallization peak (second peak from left to right in the figure) temperature is 557 ℃, and the crystallization peak area is small, which indicates that the crystallization capacity is weak, thereby ensuring that the glass cannot be crystallized in the process of melting and cooling and having higher transparency.
Referring to FIG. 4, the glass prepared in example 4 has a thermal expansion curve with a thermal expansion coefficient of 13.7X10 -6 /℃ -1 The thermal expansion coefficient of the alloy is matched with that of a GH738 nickel-based alloy matrix, and is 14.00 multiplied by 10 -6 /℃ -1 (see fig. 2) which allows good bonding of the two, a tensile strength of 18.08MPa, see fig. 8, a sample object produced, see fig. 7, from which a transition layer (black substance) is formed at the interface, from which the coating peels off during stretching.
Referring to fig. 5 and 6, it is seen from the micrograph that the matrix is tightly bonded to the glass at the interface, and from the EDS line scan, the elements Cr, co, ni in the metal matrix and K, na, O in the glass all diffuse toward each other, thereby forming a transition layer.
Referring to fig. 7, a glass coating is prepared for an optimal process. It combines well with the matrix and the coating is transparent.
Referring to FIG. 8, five experiments were performed in total to obtain an average of 18.08MPa of tensile strength for the tensile test fracture physical graph of the seventh sample. During stretching, the coating peels off and breaks away from the transition layer and the substrate, the transition layer making the bond between the two more intimate.
Example 5
36% of ammonium dihydrogen phosphate, 20% of aluminum oxide, 10% of boron oxide, 10% of sodium carbonate, 10% of potassium carbonate, 1% of lithium carbonate, 10% of silicon dioxide and 3% of calcium fluoride.
The raw materials are weighed according to a certain proportion and uniformly mixed, ground and put into a crucible after passing through a 30-mesh screen, melted for 30min at 1100 ℃, taken out and quenched by water, and the obtained glass particles are dried, crushed and ball-milled to micron-sized powder. GH738 nickel-based alloy is selected as a matrix, the surface is polished to have a roughness of 3 mu m, and glass powder and deionized water are mixed according to a proportion of 8:2, mixing the materials in proportion to form slurry, uniformly coating the slurry on the surface of the alloy, drying the alloy at 40 ℃, preserving the heat for 8 minutes at 700 ℃, taking out the alloy, contacting with an iron block at normal temperature, and rapidly cooling the alloy.
Example 6
37% of ammonium dihydrogen phosphate, 30% of aluminum oxide, 5% of boron oxide, 10% of sodium carbonate, 12% of potassium carbonate, 2% of lithium carbonate, 3% of silicon dioxide and 1% of calcium fluoride.
The raw materials are weighed according to a certain proportion and uniformly mixed, ground and put into a crucible after passing through a 30-mesh screen, melted for 20min at 1150 ℃, taken out and quenched by water, and the obtained glass particles are dried, crushed and ball-milled to micron-sized powder. GH738 nickel-based alloy is selected as a matrix, the surface is polished to have the roughness of 8 mu m, and glass powder and deionized water are mixed according to a ratio of 6:4, mixing the materials in proportion to form slurry, uniformly coating the slurry on the surface of the alloy, drying the alloy at 60 ℃, preserving the heat for 10min at 1000 ℃ after drying, taking out the alloy, contacting with an iron block at normal temperature, and rapidly cooling the alloy.
Example 7
40% of ammonium dihydrogen phosphate, 13% of aluminum oxide, 1% of boron oxide, 20% of sodium carbonate, 11% of potassium carbonate, 5% of lithium carbonate, 5% of silicon dioxide and 5% of calcium fluoride.
The raw materials are weighed according to a certain proportion and uniformly mixed, ground and put into a crucible after passing through a 30-mesh screen, melted for 15min at 1200 ℃, taken out and quenched by water, and the obtained glass particles are dried, crushed and ball-milled to micron-sized powder. GH738 nickel-based alloy is selected as a matrix, the surface is polished to have the roughness of 1 mu m, and glass powder and deionized water are mixed according to the proportion of 7:3 mixing the materials in proportion to form slurry, uniformly coating the slurry on the surface of the alloy, drying the alloy at 20 ℃, preserving the heat for 4min at 800 ℃, taking out the alloy, contacting with an iron block at normal temperature, and rapidly cooling the alloy.
Example 8
45% of ammonium dihydrogen phosphate, 25% of aluminum oxide, 1% of boron oxide, 10% of sodium carbonate, 10% of potassium carbonate, 3% of lithium carbonate, 1% of silicon dioxide and 5% of calcium fluoride.
The raw materials are weighed according to a certain proportion and uniformly mixed, the raw materials are ground and pass through a 30-mesh screen, then are placed into a crucible, are melted for 13min at 1160 ℃, are taken out for water quenching, and the obtained glass particles are crushed and ball-milled to micron-sized powder after being dried. GH738 nickel-based alloy is selected as a matrix, the surface is polished to have the roughness of 10 mu m, and glass powder and deionized water are mixed according to a proportion of 9: mixing the materials in proportion to form slurry, uniformly coating the slurry on the surface of the alloy, drying at 30 ℃, preserving the heat for 6min at 950 ℃, taking out the slurry to contact with a normal-temperature iron block, and rapidly cooling the slurry.
Example 9
36% of ammonium dihydrogen phosphate, 20% of aluminum oxide, 1% of boron oxide, 15% of sodium carbonate, 15% of potassium carbonate, 2% of lithium carbonate, 1% of silicon dioxide and 10% of calcium fluoride.
The raw materials are weighed according to a certain proportion and uniformly mixed, ground and put into a crucible after passing through a 30-mesh screen, melted for 25min at 1140 ℃, taken out and quenched by water, and the obtained glass particles are dried, crushed and ball-milled to micron-sized powder. GH738 nickel-based alloy is selected as a matrix, the surface is polished to have the roughness of 6 mu m, and glass powder and deionized water are mixed according to a proportion of 8:2, mixing the materials in proportion to form slurry, uniformly coating the slurry on the surface of the alloy, drying the alloy at 70 ℃, preserving the heat for 2 minutes at 850 ℃, taking out the alloy, contacting with an iron block at normal temperature, and rapidly cooling the alloy.
Example 10
42% of ammonium dihydrogen phosphate, 20% of aluminum oxide, 3% of boron oxide, 10% of sodium carbonate, 20% of potassium carbonate, 1% of lithium carbonate, 2% of silicon dioxide and 2% of calcium fluoride.
The raw materials are weighed according to a certain proportion and uniformly mixed, the raw materials are ground and pass through a 30-mesh screen, then are placed into a crucible, are melted for 20min at 1180 ℃, are taken out for water quenching, and the obtained glass particles are crushed and ball-milled to micron-sized powder after being dried. GH738 nickel-based alloy is selected as a matrix, the surface is polished to have the roughness of 7 mu m, and glass powder and deionized water are mixed according to a ratio of 6:4, mixing the materials in proportion to form slurry, uniformly coating the slurry on the surface of the alloy, drying the alloy at 50 ℃, preserving the heat for 1min at 750 ℃, taking out the alloy, contacting with an iron block at normal temperature, and rapidly cooling the alloy.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A photoelastic glass coating on the surface of a nickel-based alloy is characterized in that the glass coating is attached to the surface of a blade of the nickel-based alloy, and the thermal expansion coefficient of the glass coating is 13.57 multiplied by 10 -6 /℃~16.68×10 -6 /℃；
The glass coating consists of the following raw materials in percentage by mass: 35-45% of ammonium dihydrogen phosphate, 20-30% of aluminum oxide, 1-10% of boron oxide, 10-20% of sodium carbonate, 10-20% of potassium carbonate, 1-10% of lithium carbonate, 1-10% of silicon dioxide, 1-10% of calcium fluoride and 100% of the total mass of all components.
2. The nickel-based alloy surface photoelastic glass coating of claim 1, wherein the glass coating has a temperature resistance of 407-416 ℃, a glass transition temperature of 407-416 ℃, and a glass crystallization temperature of 510-520 ℃.
3. The nickel-based alloy surface photoelastic glass coating of claim 1, wherein the raw material composition is 40% monoammonium phosphate, 20% alumina, 6% boron oxide, 12% sodium carbonate, 12% potassium carbonate, 4% lithium carbonate, 2% silica, 4% calcium fluoride.
4. The nickel-base alloy surface photoelastic glass coating of claim 1, wherein the nickel-base alloy is GH738 nickel-base alloy.
5. The method for preparing the photoelastic glass coating on the surface of the nickel-based alloy, as claimed in claim 1, is characterized by comprising the following steps:
step 1, weighing raw materials, uniformly mixing, grinding, sieving, melting, water quenching molten glass, and ball milling glass particles to a micron level to obtain micron-sized glass powder;
and 2, polishing the nickel-based alloy blade, mixing micron-sized glass powder with water to form slurry, coating the slurry on the surface of the nickel-based alloy blade, drying, preserving heat, taking out the heat-preserved blade, and performing air quenching to finish the coating preparation.
6. The method of claim 5, wherein in step 1, the melting temperature is 1100-1300 ℃ and the melting time is 10-30 min.
7. The method for preparing the photoelastic glass coating on the surface of the nickel-based alloy according to claim 5, wherein in the step 2, the drying temperature is 20-70 ℃; the heat preservation temperature is 700-1000 ℃, and the heat preservation time is 1-10 min.
8. The method for preparing a photoelastic glass coating on a nickel-based alloy surface according to claim 5, wherein in the step 2, the mixing volume ratio of glass powder to water is 9:1-6:4.
9. The method for preparing the photoelastic glass coating on the surface of the nickel-based alloy according to claim 5, wherein the air quenching process is as follows: and (3) placing the pressed sheet coated with the coating on a normal-temperature refractory brick, carrying out air quenching for 5s, then contacting with a normal-temperature iron block, and cooling to finish the preparation of the coating.
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