CN115162021B - Formula and preparation method of aircraft engine heat shield - Google Patents
Formula and preparation method of aircraft engine heat shield Download PDFInfo
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- CN115162021B CN115162021B CN202210905676.XA CN202210905676A CN115162021B CN 115162021 B CN115162021 B CN 115162021B CN 202210905676 A CN202210905676 A CN 202210905676A CN 115162021 B CN115162021 B CN 115162021B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000009472 formulation Methods 0.000 title description 4
- 239000000853 adhesive Substances 0.000 claims abstract description 29
- 230000001070 adhesive effect Effects 0.000 claims abstract description 29
- 239000003822 epoxy resin Substances 0.000 claims abstract description 29
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 29
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003085 diluting agent Substances 0.000 claims abstract description 13
- 239000003973 paint Substances 0.000 claims abstract description 13
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 72
- 238000003756 stirring Methods 0.000 claims description 47
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 42
- 238000000465 moulding Methods 0.000 claims description 35
- 238000002156 mixing Methods 0.000 claims description 27
- 239000011265 semifinished product Substances 0.000 claims description 27
- 239000004744 fabric Substances 0.000 claims description 22
- 230000001680 brushing effect Effects 0.000 claims description 21
- 239000000047 product Substances 0.000 claims description 21
- 239000000377 silicon dioxide Substances 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 18
- 239000011148 porous material Substances 0.000 claims description 12
- 238000009966 trimming Methods 0.000 claims description 10
- 238000003892 spreading Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- -1 and then Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 9
- 238000009413 insulation Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 239000012774 insulation material Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 3
- 239000011153 ceramic matrix composite Substances 0.000 description 3
- 229920006332 epoxy adhesive Polymers 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0061—Organic fillers or organic fibrous fillers, e.g. ground leather waste, wood bark, cork powder, vegetable flour; Other organic compounding ingredients; Post-treatment with organic compounds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
- D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
- D06N3/0088—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by directly applying the resin
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/24—Heat or noise insulation
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/06—Properties of the materials having thermal properties
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2211/00—Specially adapted uses
- D06N2211/12—Decorative or sun protection articles
- D06N2211/26—Vehicles, transportation
- D06N2211/267—Aircraft
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a formula of an aircraft engine heat shield and a preparation method thereof, which relate to the technical field of aviation materials, and the formula comprises the following components in parts by weight: 45-70 parts of silicone paint, 30-55 parts of diluent, 10-15 parts of epoxy resin adhesive and 5-10 parts of fine aluminum powder. The epoxy resin adhesive is an aluminum-filled, touch-sensitive, single-component epoxy resin adhesive. After the technical scheme is adopted, the invention can ensure the heat insulation effect, increase the oxidation resistance and high temperature resistance, and has simple preparation process.
Description
Technical Field
The invention relates to the technical field of aviation materials, in particular to a preparation method of an aircraft engine heat shield.
Background
With the rapid development of the domestic aviation industry, the engine is particularly obvious as a heart of the aviation industry, and the engine directly affects various performances of the aircraft, but the engine generates huge heat in the working process to affect the performances and the service life of peripheral components, and meanwhile, the requirements on the peripheral components are increased; therefore, protection of engine heat becomes more important, and at present, soft fiber heat insulation materials are directly used for coating the protection measures of the engine heat, but vibration at high temperature can cause material structure damage to influence the heat insulation effect; at present, a hard heat shield prepared from a high-temperature ceramic matrix composite material is used in the market, but the ceramic matrix composite material has higher heat conductivity and is easy to cause heat conduction, so that the application and development of the ceramic matrix composite material on heat insulation of an engine are greatly limited, and the development of a heat insulation material with excellent heat insulation performance is particularly important for the heat insulation technology of an aeroengine.
In view of the above, the present invention has been developed and devised to solve the aforementioned drawbacks and inconveniences caused by the imperfection, and to intensively develop and design the present invention by actively studying and modifying trial.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides a formula and a preparation method of an aircraft engine heat shield, wherein the formula can ensure heat insulation effect, increase oxidation resistance and high temperature resistance and is simple in preparation process.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A formulation for an aircraft engine heat shield, the formulation comprising by weight: 45-70 parts of silicone paint, 30-55 parts of diluent, 10-15 parts of epoxy resin adhesive and 5-10 parts of fine aluminum powder.
Further, the epoxy adhesive is an aluminum filled, touch sensitive, one-component epoxy adhesive.
A method of making an aircraft engine heat shield comprising the steps of:
Step one: taking 45-70 parts of silicone paint and 30-55 parts of diluent, stirring and mixing the raw materials in percentage by weight at the temperature of 10-35 ℃ at the stirring speed of 100-600 r/min to prepare a mixture A;
step two: taking 10-15 parts of epoxy resin adhesive and 5-10 parts of fine powder aluminum powder, stirring and mixing the raw materials in percentage by weight at the temperature of 10-35 ℃ at the stirring speed of 20-50 r/min to prepare a mixture B;
step three: mixing 80-85 parts of the mixture A obtained in the step one and 15-20 parts of the mixture B obtained in the step two at the temperature of 10-35 ℃ at the stirring speed of 100-600 r/min to obtain a mixture C;
Step four: spreading high silica cloth with the thickness of 0.5-0.75 mm in a heat shield mold cavity, uniformly brushing the mixture C obtained in the step three on the upper and lower surfaces of the high silica cloth by using a hairbrush, wherein the brushing thickness is 0.2-0.3 mm; then closing the mould, putting the mould into a hot press table for forming, cooling to below 60 ℃, opening the mould to obtain a shaped semi-finished product, and trimming;
step five: and C, uniformly brushing the mixture C obtained in the step III on the upper surface and the lower surface of the semi-finished product obtained in the step four by using a hairbrush, repairing surface pores, then placing the semi-finished product into a secondary forming die, locking the die, placing the die into an oven for baking, and cooling to obtain the heat shield finished product.
Further, the specification of the fine powder aluminum powder in the second step is more than or equal to 200 meshes.
Further, the viscosity of the epoxy resin adhesive in the second step is 150,000-300,000cP, and the collapse degree is less than or equal to 0.3mm.
In the fourth step, the molding temperature is 100-180 ℃, the molding machine pressure is 30-70T, and the molding time is 120-180 min.
In the fifth step, the baking temperature is 140-180 ℃ and the baking time is 60-120 min.
And further, the heat-insulating cover finished product obtained in the step five has pores or defects on the surface, the step five can be repeated for repairing to obtain the heat-insulating cover finished product, and then the product glued surface is coated with a mixture and then is put into a jig for adapting and fixing.
After the technical scheme is adopted, compared with the traditional aircraft engine heat shield, the heat shield has the advantages that the heat shield effect is ensured, meanwhile, the heat shield intermediate layer is reduced, the heat shield material is modified by adding the auxiliary agent, the oxidation resistance and high temperature resistance of the aircraft engine heat shield are effectively improved, and the obtained aircraft engine heat shield is light in weight, good in heat shield and cold-proof effect, wide in heat-resistant range, simple in preparation process and worthy of popularization.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of the preparation process of the invention.
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
The invention discloses a formula of an aircraft engine heat shield, which comprises the following components in parts by weight: 45-70 parts of silicone paint, 30-55 parts of diluent, 10-15 parts of epoxy resin adhesive and 5-10 parts of fine aluminum powder.
Referring to FIG. 1, the invention also discloses a preparation method of the aircraft engine heat shield, which comprises the following steps:
Step one: taking 45-70 parts of silicone paint and 30-55 parts of diluent, stirring and mixing the raw materials in percentage by weight at the temperature of 10-35 ℃ at the stirring speed of 100-600 r/min to prepare a mixture A;
Step two: taking 10-15 parts of epoxy resin adhesive and 5-10 parts of fine powder aluminum powder, stirring and mixing the raw materials in percentage by weight at the temperature of 10-35 ℃ at the stirring speed of 20-50 r/min to prepare a mixture B; the specification of the fine aluminum powder is 200 meshes; the viscosity of the epoxy resin adhesive is 150,000-300,000cP, and the collapse degree is less than or equal to 0.3mm;
step three: mixing 80-85 parts of the mixture A obtained in the step one and 15-20 parts of the mixture B obtained in the step two at the temperature of 10-35 ℃ at the stirring speed of 100-600 r/min to obtain a mixture C;
Step four: spreading high silica cloth with the thickness of 0.5-0.75 mm in a heat shield mold cavity, uniformly brushing the mixture C obtained in the step three on the upper and lower surfaces of the high silica cloth by using a hairbrush, wherein the brushing thickness is 0.3mm; then closing the mould, and putting the mould into a hot press table for molding; the molding temperature is 100-180 ℃, the molding machine pressure is 30-70T, and the molding time is 120-180 min; then cooling to below 60 ℃ and opening the mould to obtain a shaped semi-finished product, and trimming;
Step five: uniformly brushing the mixture C obtained in the step three on the upper surface and the lower surface of the semi-finished product obtained in the step four by using a hairbrush, repairing surface pores, then placing the semi-finished product into a secondary forming die, locking the die, placing the die into an oven for baking, wherein the baking temperature is 140-180 ℃ and the baking time is 60-120 min; and cooling to obtain the heat shield finished product.
Furthermore, the epoxy resin adhesive in the second step is an aluminum-filled, touch-sensitive and single-component epoxy resin adhesive, has the advantage of high temperature resistance, has excellent tensile shear strength and impact resistance, can be used for bonding oily and other operation surfaces with poorer pretreatment, and is suitable for bonding various materials.
And further, the heat-insulating cover finished product obtained in the step five has pores or defects on the surface, the step five can be repeated for repairing to obtain the heat-insulating cover finished product, and then the product glued surface is coated with a mixture and then is put into a jig for adapting and fixing.
In the above, if one weight part is 5g, each component is obtained by multiplying 5g by the corresponding weight part, and the weight of each weight part is specifically set according to actual needs.
In the fourth step, cleaning the surface of a die, pasting the teflon cloth according to the size of a die cavity, and then properly amplifying the high silica cloth by 100mm-150mm according to the tiling size of the product; and then carrying out a molding process.
Example 1
A method of making an aircraft engine heat shield comprising the steps of:
Step one: taking 70 parts of silicone paint and 55 parts of diluent, stirring and mixing the raw materials in percentage by weight at the temperature of 10-35 ℃ at the stirring speed of 600r/min to obtain a mixture A;
Step two: taking 14 parts of epoxy resin adhesive and 10 parts of fine aluminum powder, and stirring and mixing the raw materials in percentage by weight at 25 ℃ at a stirring speed of 50r/min to prepare a mixture B; the specification of the fine aluminum powder is 200 meshes; the viscosity of the epoxy resin adhesive is 150,000-300,000cP, and the collapse degree is less than or equal to 0.3mm;
step three: mixing 80 parts of the mixture A obtained in the step one and 20 parts of the mixture B obtained in the step two at the temperature of 20 ℃ at the stirring speed of 600r/min to obtain a mixture C;
step four: spreading high silica cloth with the thickness of 0.6mm in a heat shield mold cavity, uniformly brushing the mixture C obtained in the step three on the upper and lower surfaces of the high silica cloth by using a hairbrush, wherein the brushing thickness is 0.3mm; then closing the mould, and putting the mould into a hot press table for molding; the molding temperature is 150 ℃, the molding machine pressure is 70T, and the molding time is 180min; then cooling to below 60 ℃ and opening the mould to obtain a shaped semi-finished product, and trimming;
Step five: uniformly brushing the mixture C obtained in the step three on the upper surface and the lower surface of the semi-finished product obtained in the step four by using a hairbrush, repairing surface pores, then placing the semi-finished product into a secondary forming die, locking the die, and placing the die into an oven for baking at 180 ℃ for 60min; and cooling to obtain the heat shield finished product.
Example 2
A method of making an aircraft engine heat shield comprising the steps of:
Step one: taking 45 parts of silicone paint and 36 parts of diluent, stirring and mixing the raw materials in percentage by weight at the temperature of 10 ℃ at the stirring speed of 100r/min to prepare a mixture A;
Step two: taking 10 parts of epoxy resin adhesive and 5 parts of fine aluminum powder, and stirring and mixing the raw materials in percentage by weight at the temperature of 10 ℃ at the stirring speed of 20r/min to prepare a mixture B; the specification of the fine aluminum powder is more than or equal to 200 meshes; the viscosity of the epoxy resin adhesive is 150,000-300,000cP, and the collapse degree is less than or equal to 0.3mm;
step three: mixing 80 parts of the mixture A obtained in the step one and 15 parts of the mixture B obtained in the step two at the temperature of 10 ℃ at the stirring speed of 100r/min to obtain a mixture C;
Step four: spreading high silica cloth with the thickness of 0.5mm in a heat shield mold cavity, uniformly brushing the mixture C obtained in the step three on the upper and lower surfaces of the high silica cloth by using a hairbrush, wherein the brushing thickness is 0.2mm; then closing the mould, and putting the mould into a hot press table for molding; the molding temperature is 120 ℃, the molding machine pressure is 30T, and the molding time is 120min; then cooling to below 60 ℃ and opening the mould to obtain a shaped semi-finished product, and trimming;
step five: uniformly brushing the mixture C obtained in the step three on the upper surface and the lower surface of the semi-finished product obtained in the step four by using a hairbrush, repairing surface pores, then placing the semi-finished product into a secondary forming die, locking the die, and placing the die into an oven for baking at the temperature of 140 ℃ for 120min; and cooling to obtain the heat shield finished product.
Example 3
A method of making an aircraft engine heat shield comprising the steps of:
Step one: taking 60 parts of silicone paint and 48 parts of diluent, stirring and mixing the raw materials in percentage by weight at 25 ℃ at a stirring speed of 300r/min to prepare a mixture A;
Step two: taking 12 parts of epoxy resin adhesive and 8 parts of fine aluminum powder, and stirring and mixing the raw materials in percentage by weight at 25 ℃ at a stirring speed of 30r/min to prepare a mixture B; the specification of the fine aluminum powder is more than or equal to 200 meshes; the viscosity of the epoxy resin adhesive is 150,000-300,000cP, and the collapse degree is less than or equal to 0.3mm;
step three: mixing 85 parts of the mixture A obtained in the step one and 15 parts of the mixture B obtained in the step two at 25 ℃ at a stirring speed of 300r/min to obtain a mixture C;
Step four: spreading high silica cloth with the thickness of 0.6mm in a heat shield mold cavity, uniformly brushing the mixture C obtained in the step three on the upper and lower surfaces of the high silica cloth by using a hairbrush, wherein the brushing thickness is 0.25mm; then closing the mould, and putting the mould into a hot press table for molding; the molding temperature is 160 ℃, the molding machine pressure is 50T, and the molding time is 150min; then cooling to below 60 ℃ and opening the mould to obtain a shaped semi-finished product, and trimming;
Step five: uniformly brushing the mixture C obtained in the step three on the upper surface and the lower surface of the semi-finished product obtained in the step four by using a hairbrush, repairing surface pores, then placing the semi-finished product into a secondary forming die, locking the die, and placing the die into an oven for baking at 160 ℃ for 80min; and cooling to obtain the heat shield finished product.
Example 4
Step one: taking 55 parts of silicone paint and 44 parts of diluent, stirring and mixing the raw materials in percentage by weight at 20 ℃ at a stirring speed of 600r/min to obtain a mixture A;
Step two: taking 11 parts of epoxy resin adhesive and 10 parts of fine aluminum powder, and stirring and mixing the raw materials in percentage by weight at the temperature of 30 ℃ at the stirring speed of 50r/min to prepare a mixture B; the specification of the fine aluminum powder is more than or equal to 200 meshes; the viscosity of the epoxy resin adhesive is 150,000-300,000cP, and the collapse degree is less than or equal to 0.3mm;
Step three: mixing 85 parts of the mixture A obtained in the step one and 10 parts of the mixture B obtained in the step two at the temperature of 30 ℃ at the stirring speed of 600r/min to obtain a mixture C;
Step four: spreading high silica cloth with the thickness of 0.75mm in a heat shield mold cavity, uniformly brushing the mixture C obtained in the step three on the upper and lower surfaces of the high silica cloth by using a hairbrush, wherein the brushing thickness is 0.3mm; then closing the mould, and putting the mould into a hot press table for molding; the molding temperature is 180 ℃, the molding machine pressure is 70T, and the molding time is 120min; then cooling to below 60 ℃ and opening the mould to obtain a shaped semi-finished product, and trimming;
Step five: uniformly brushing the mixture C obtained in the step three on the upper surface and the lower surface of the semi-finished product obtained in the step four by using a hairbrush, repairing surface pores, then placing the semi-finished product into a secondary forming die, locking the die, and placing the die into an oven for baking at 180 ℃ for 60min; and cooling to obtain the heat shield finished product.
Example 5
A method of making an aircraft engine heat shield comprising the steps of:
Step one: taking 70 parts of silicone paint and 55 parts of diluent, stirring and mixing the raw materials in percentage by weight at the temperature of 30 ℃ at the stirring speed of 600r/min to obtain a mixture A;
Step two: taking 15 parts of epoxy resin adhesive and 6 parts of fine aluminum powder, and stirring and mixing the raw materials in percentage by weight at the temperature of 30 ℃ at the stirring speed of 40r/min to prepare a mixture B; the specification of the fine aluminum powder is more than or equal to 200 meshes; the viscosity of the epoxy resin adhesive is 150,000-300,000cP, and the collapse degree is less than or equal to 0.3mm;
Step three: and (3) taking 80 parts of the mixture A obtained in the step (I) and 20 parts of the mixture B obtained in the step (II), and stirring and mixing at the temperature of 25 ℃ at the stirring speed of 200r/min to obtain a mixture C.
Step four: spreading high silica cloth with the thickness of 0.55mm in a heat shield mold cavity, uniformly spraying the mixture C obtained in the step three on the upper and lower surfaces of the high silica cloth by using a spray gun, wherein the spraying thickness is 0.1mm; then closing the mould, and putting the mould into a hot press table for molding; the molding temperature is 160 ℃, the molding machine pressure is 45T, and the molding time is 150min; cooling to below 60 ℃ and opening the mould to obtain a shaped semi-finished product, and trimming;
step five: repeating the fourth step for 1-2 times;
Step six: uniformly spraying the mixture C obtained in the step three on the upper surface and the lower surface of the semi-finished product obtained in the step four by using a spray gun, repairing surface pores, then placing the semi-finished product into a secondary forming die, locking the die, and placing the die into an oven for baking, wherein the baking temperature is 150 ℃ and the baking time is 70min; and cooling to obtain the heat shield finished product.
Example 6
A method of making an aircraft engine heat shield comprising the steps of:
Step one: taking 65 parts of silicone paint and 52 parts of diluent, stirring and mixing the raw materials in percentage by weight at 25 ℃ at a stirring speed of 400r/min to obtain a mixture A;
Step two: taking 13 parts of epoxy resin adhesive and 9 parts of fine aluminum powder, and stirring and mixing the raw materials in percentage by weight at 25 ℃ at a stirring speed of 50r/min to prepare a mixture B; the specification of the fine aluminum powder is more than or equal to 200 meshes; the viscosity of the epoxy resin adhesive is 150,000-300,000cP, and the collapse degree is less than or equal to 0.3mm;
Step three: and (3) taking 85 parts of the mixture A obtained in the step (I) and 20 parts of the mixture B obtained in the step (II), and stirring and mixing at the stirring speed of 400r/min at the temperature of 15 ℃ to obtain a mixture C.
Step four: spreading high silica cloth with the thickness of 0.65mm in a heat shield mold cavity, uniformly spraying the mixture C obtained in the step three on the upper and lower surfaces of the high silica cloth by using a spray gun, wherein the spraying thickness is 0.2mm; then closing the mould, and putting the mould into a hot press table for molding; the molding temperature is 180 ℃, the molding machine pressure is 70T, and the molding time is 180min; cooling to below 60 ℃ and opening the mould to obtain a shaped semi-finished product, and trimming;
step five: repeating the fourth step for 1-2 times;
Step six: uniformly spraying the mixture C obtained in the step three on the upper surface and the lower surface of the semi-finished product obtained in the step four by using a spray gun, repairing surface pores, then placing the semi-finished product into a secondary forming die, locking the die, and placing the die into an oven for baking, wherein the baking temperature is 180 ℃ and the baking time is 120min; and cooling to obtain the heat shield finished product.
The working principle of the invention is as follows: the invention adopts high silica cloth and high temperature resistant single component epoxy resin adhesive, improves the comprehensive performance of the heat insulation material by adding auxiliary agent, adopts the modified heat insulation material to prepare a mixture, spreads the high silica cloth in a heat insulation cover die cavity, brushes the mixture prepared by the heat insulation material for compression molding, and after cooling and shaping, performs trimming treatment, and brushes the mixture for a second time and bakes the mixture to obtain the finished product of the heat insulation cover of the aircraft engine;
Compared with the traditional heat shield of the aircraft engine, the heat shield of the invention reduces the heat shield intermediate layer while guaranteeing the heat shield effect, and the heat shield material is modified by adding the auxiliary agent, so that the oxidation resistance and high temperature resistance of the heat shield of the aircraft engine are effectively improved, and the obtained heat shield of the aircraft engine has the advantages of light weight, good heat shield and cold-proof effects, wide heat-resistant range, simple preparation process and popularization value.
The foregoing is merely illustrative of the present invention and not restrictive, and other modifications and equivalents thereof may occur to those skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. An aircraft engine heat shield, characterized in that: the formula comprises the following components in parts by weight: 45-70 parts by weight of silicone paint, 35-55 parts by weight of diluent, 10-15 parts by weight of epoxy resin adhesive and 5-10 parts by weight of fine aluminum powder;
the preparation of the aircraft engine heat shield comprises the following steps:
step one: taking 45-70 parts of silicone paint and 35-55 parts of diluent, stirring and mixing the raw materials in percentage by weight at the temperature of 10-35 ℃ at the stirring speed of 100-600 r/min to obtain a mixture A;
Step two: taking 10-15 parts of epoxy resin adhesive and 5-10 parts of fine powder aluminum powder, stirring and mixing the raw materials in percentage by weight at the temperature of 10-35 ℃ at the stirring speed of 20-50 r/min to prepare a mixture B;
step three: mixing 80-85 parts of the mixture A obtained in the step one and 15-20 parts of the mixture B obtained in the step two at the temperature of 10-35 ℃ at the stirring speed of 100-600 r/min to obtain a mixture C;
Step four: spreading high silica cloth with the thickness of 0.5-0.75 mm in a heat shield mold cavity, uniformly brushing the mixture C obtained in the step three on the upper and lower surfaces of the high silica cloth by using a hairbrush, wherein the brushing thickness is 0.2-0.3 mm; then closing the mould, putting the mould into a hot press table for forming, cooling to below 60 ℃, opening the mould to obtain a shaped semi-finished product, and trimming;
Step five: uniformly brushing the mixture C obtained in the step three on the upper surface and the lower surface of the semi-finished product obtained in the step four by using a hairbrush, repairing surface pores, then placing the semi-finished product into a secondary forming die, locking the die, placing the die into an oven for baking, and cooling to obtain a heat shield finished product;
The epoxy resin adhesive is an aluminum-filled, touch-sensitive and single-component epoxy resin adhesive;
The specification of the fine powder aluminum powder in the second step is more than or equal to 200 meshes;
The viscosity of the epoxy resin adhesive in the second step is 150,000-300,000cP, and the collapse degree is less than or equal to 0.3mm.
2. An aircraft engine heat shield according to claim 1, wherein: in the fourth step, the molding temperature is 100-180 ℃, the molding machine pressure is 30-70T, and the molding time is 120-180 min.
3. An aircraft engine heat shield according to claim 1, wherein: in the fifth step, the baking temperature is 140-180 ℃ and the baking time is 60-120 min.
4. An aircraft engine heat shield according to claim 1, wherein: the steps of
The heat shield finished product obtained in the fifth step has pores or surface defects, the fifth step can be repeated for repairing,
And (3) obtaining a heat shield finished product, and then, coating the glued surface of the heat shield finished product with a mixture, and then, putting the heat shield finished product into a jig for adapting and fixing.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018045622A1 (en) * | 2016-09-09 | 2018-03-15 | 东南大学 | Micro powder-reinforced, polyurethane-based, high-strength, waterproof, thermal-insulation decorative integrated material and preparation method therefor |
| CN111253753A (en) * | 2020-03-24 | 2020-06-09 | 霍山汇能汽车零部件制造有限公司 | Heat-insulating composite material and application thereof to engine heat shield |
| CN111454018A (en) * | 2020-04-22 | 2020-07-28 | 黄河水利水电开发总公司监测维修分公司 | High-toughness wear-resistant epoxy resin polymer mortar and application method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018045622A1 (en) * | 2016-09-09 | 2018-03-15 | 东南大学 | Micro powder-reinforced, polyurethane-based, high-strength, waterproof, thermal-insulation decorative integrated material and preparation method therefor |
| CN111253753A (en) * | 2020-03-24 | 2020-06-09 | 霍山汇能汽车零部件制造有限公司 | Heat-insulating composite material and application thereof to engine heat shield |
| CN111454018A (en) * | 2020-04-22 | 2020-07-28 | 黄河水利水电开发总公司监测维修分公司 | High-toughness wear-resistant epoxy resin polymer mortar and application method thereof |
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