ALD coating low-expansion alloy forging process for photoelectric products

Abstract

The application discloses a low-expansion alloy forging process for ALD coating photoelectric products. Before being forged, the surface of a low-expansion alloy blank is subjected to grinding and high-temperature corrosion-resistant coating treatment. The grinding is used to reduce the physical defects on the surface of the low-expansion alloy blank, and the high-temperature corrosion-resistant coating is used to prevent surface grain boundary defects caused by gas penetration into the surface grain boundary of the low-expansion alloy blank during heating. The improvement of the surface defects of the low-expansion alloy blank solves the stress concentration phenomenon of the material periphery of the low-expansion alloy blank during large deformation hot forging, thereby solving the cracking problem of the material periphery of the low-expansion alloy during large deformation hot forging, improving the material utilization, and reducing the product cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low expansion alloy forging processing technology, in particular to a low expansion alloy forging processing technology for ALD-coated photoelectric products. BACKGROUND

[0002] In order to ensure the same mechanical properties of the low expansion alloy for ALD-coated photoelectric products in its working plane, the large deformation hot forging process is easily adopted for its deformation processing. However, during the large deformation hot forging process of the low expansion alloy, forging cracks will appear on the periphery of the material, so that the material has to be removed by machining after the forging processing, resulting in low material utilization and high product cost. SUMMARY

[0003] In order to overcome the shortcomings in the background art, the present application discloses a low expansion alloy forging processing technology for ALD-coated photoelectric products. Before forging, the surface of the low expansion alloy blank is subjected to grinding processing and high-temperature corrosion-resistant coating treatment. The grinding processing is used to reduce the physical structure defects on the surface of the low expansion alloy blank, and the high-temperature corrosion-resistant coating is used to prevent surface grain boundary defects caused by gas penetration into the surface grain boundary of the low expansion alloy blank during heating. The improvement of the above-mentioned surface defects of the low expansion alloy blank solves the stress concentration phenomenon of the periphery of the material during the large deformation hot forging process of the low expansion alloy blank, thereby solving the cracking problem of the periphery of the material during the large deformation hot forging process of the low expansion alloy.

[0004] In order to achieve the object of the present application, the present application adopts the following technical solution: a low expansion alloy forging processing technology for ALD-coated photoelectric products. Before forging, the surface of the low expansion alloy blank is subjected to grinding processing and high-temperature corrosion-resistant coating treatment. The specific method is as follows:

[0005] 1. The surface of the low expansion alloy blank is subjected to grinding processing, and the surface roughness is less than 0.8Ra;

[0006] 2. The surface of the low expansion alloy blank is coated with a high-temperature corrosion-resistant coating with a thickness of 0.4-0.6mm by airless high-pressure spraying at a temperature of 2300℃;

[0007] 3. The low expansion alloy blank coated with the high-temperature corrosion-resistant coating is dried by hot air at a temperature of 50-70℃ for 10 hours to complete the low-temperature curing of the surface high-temperature corrosion-resistant coating.

[0008] Further, the low expansion alloy blank after low temperature curing of the surface high temperature resistant anticorrosive paint is heated to 850-900°C in a vacuum furnace, and is kept for 0.5-2.0 hours, and is air cooled to room temperature, and high temperature curing of the surface high temperature resistant anticorrosive paint is completed; the low expansion alloy blank after high temperature curing of the surface high temperature resistant anticorrosive paint is heated from room temperature to 1150-1200°C, the heating rate is 30-40°C / hour, and is kept for 2 hours; and then once forging is performed to the required size under a forging machine.

[0009] Preferably, the low expansion alloy blank after low temperature curing of the surface high temperature resistant anticorrosive paint is heated to 1150-1200°C in a vacuum furnace, the heating rate is 30-40°C / hour, and is kept for 2 hours; and then once forging is performed to the required size under a forging machine.

[0010] For the mechanism of the above process measures for improving the material peripheral forging cracks of the low expansion alloy in the process of large deformation hot forging, the following is explained: in the process of hot deformation of the low expansion alloy, with the decrease of the grain size and the increase of the grain boundary strengthening, the plasticity of the low expansion alloy becomes worse and worse, and thus the deformation resistance becomes larger and larger, and finally the structure is damaged at the material peripheral where the deformation is the largest, and cracks are generated; further analysis shows that the place where the cracks are generated is actually the place where the tensile stress is the largest, i.e. the place where stress concentration exists; and the stress concentration is caused by two reasons: 1. the surface physical structure defects of the low expansion alloy itself, such as the tool cutting lines; 2. the surface grain boundary defects caused by the penetration of the furnace gas into the grain boundaries at high temperature in the heating process of the low expansion alloy; the above two defects will cause the stress concentration at the material peripheral where the deformation is the largest in the process of hot deformation of the low expansion alloy; with the increase of the hot deformation amount of the low expansion alloy, the plasticity becomes worse and worse, and thus the deformation resistance becomes larger and larger, and thus the stress concentration becomes more and more serious; when the local stress is larger than the strength of the material, the structure is damaged at the stress concentration place, and cracks are generated; through the above analysis, if the surface physical structure defects of the low expansion alloy itself or the surface grain boundary defects in the heating process can be eliminated or improved, the cracking problem of the low expansion alloy at the material peripheral in the process of large deformation hot forging can be delayed or eliminated; and the process of the present application is the improvement measure for the surface physical structure defects of the low expansion alloy itself and the surface grain boundary defects in the heating process; the grinding process is used to reduce the surface physical structure defects of the low expansion alloy blank, and the coating of the high temperature resistant anticorrosive paint is used to prevent the surface grain boundary defects caused by the penetration of the gas into the surface grain boundaries of the low expansion alloy blank in the heating process.

[0011] With the technical scheme as described above, the present application has the following beneficial effects: the ALD-coated photoelectric product low-expansion alloy forging process disclosed in the present application has the following advantages: the surface of the low-expansion alloy blank is subjected to grinding and high-temperature corrosion-resistant coating before forging; the grinding is used to reduce the physical defects on the surface of the low-expansion alloy blank, and the high-temperature corrosion-resistant coating is used to prevent the surface grain boundary defects caused by the penetration of gas into the surface grain boundary of the low-expansion alloy blank during heating; the improvement of the surface defects of the low-expansion alloy blank solves the stress concentration phenomenon of the material periphery of the low-expansion alloy blank during the large deformation hot forging process, thereby solving the cracking problem of the material periphery of the low-expansion alloy during the large deformation hot forging process, improving the material utilization, and reducing the product cost. DETAILED DESCRIPTION

[0012] The present application can be explained in detail by the following examples, and the purpose of the present application is to protect all technical improvements within the scope of the present application. Example 1

[0013] The ALD-coated photoelectric product low-expansion alloy forging process is used to improve the forging crack problem of the material periphery of the low-expansion alloy during the large deformation hot forging process; the following describes the low-expansion alloy large deformation hot forging process by taking the large deformation hot forging of the ALD-coated circular plate-shaped photoelectric product made of 3J and 4J low-expansion alloy materials as an example.

[0014] The size of the low-expansion alloy blank is φ50*60mm, and the size after hot forging is φ111.8*12mm, and the hot forging processing rate is 80%;

[0015] The specific processing process is as follows:

[0016] 1. Low-expansion alloy bar external grinding, surface roughness less than 0.8Ra; machining cutting to 61.0mm, both end face grinding, surface roughness less than 0.8Ra; φ50*60mm low-expansion alloy blank is prepared;

[0017] 2. The corrosion-resistant coating mixture is prepared by mixing the corrosion-resistant coating A and B components (A is powder and B is liquid) in a weight ratio of 1:1; the corrosion-resistant coating mixture is coated on the surface of the low-expansion alloy blank by using the airless high-pressure spraying process, and the spraying thickness is 0.5mm;

[0018] 3. The low-expansion alloy blank coated with the high-temperature corrosion-resistant coating is placed on an open shelf and dried in a drying room at 60℃ for 10 hours to complete the low-temperature curing of the high-temperature corrosion-resistant coating on the surface;

[0019] 4. The low expansion alloy blank with low temperature cured surface high temperature resistant anticorrosive coating is heated from room temperature to 850-900℃ in a vacuum furnace at a heating rate of 30℃ / hour, and is kept for 1.0 hour, and is air cooled to room temperature; during the heating and keeping process, the solution and filler lattice in the high temperature resistant anticorrosive coating are cross-linked to form a dense glass phase, and the high temperature curing of the high temperature resistant anticorrosive coating is completed; the high temperature cured high temperature resistant anticorrosive coating is waterproof and airproof, and prevents gas from penetrating into the surface grain boundary of the low expansion alloy blank during the heating process to generate surface grain boundary defects;

[0020] 6. The low expansion alloy blank with high temperature cured surface high temperature resistant anticorrosive coating is heated from room temperature to 1150℃ at a heating rate of 40℃ / hour, and is kept for 2 hours; and then is once forged in a forging machine to process the low expansion alloy blank from φ50*60mm to φ111.8*12mm. Example Two:

[0021] The specific processing process is as follows:

[0022] 1. The low expansion alloy blank is processed by outer circle grinding, and the surface roughness is less than 0.8Ra; the blank is cut to 61.0mm by machining, and the surface roughness of the two end faces is less than 0.8Ra; and the low expansion alloy blank is prepared.

[0023] 2. The high temperature resistant anticorrosive coating A and B components (A is a powder, and B is a liquid) are mixed by fully stirring at a weight ratio of 1:1 to prepare a high temperature resistant anticorrosive coating mixture; the high temperature resistant anticorrosive coating mixture is coated on the surface of the low expansion alloy blank by using a non-gas high pressure spraying process, and the spraying thickness is 0.4mm.

[0024] 3. The low expansion alloy blank with surface coated high temperature resistant anticorrosive coating is placed on an open shelf, and is dried in a drying room by using 55℃ hot air for 10 hours to complete the low temperature curing of the surface high temperature resistant anticorrosive coating.

[0025] 4. The low expansion alloy blank with low temperature cured surface high temperature resistant anticorrosive coating is heated to 1200℃ in a vacuum furnace at a heating rate of 30℃ / hour, and is kept for 2 hours; and then is once forged in a forging machine to process the low expansion alloy blank from φ50*60mm to φ111.8*12mm.

[0026] The part not described in the application is prior art.

Claims

1. A low expansion alloy forging process for ALD-coated photovoltaic products, characterized by: The low-expansion alloy blank is subjected to surface grinding and high-temperature corrosion-resistant coating before forging, and the specific process is as follows:

1. The surface of the low-expansion alloy blank is ground, and the surface roughness is less than 0.8 Ra; 2. The surface of the low-expansion alloy blank is coated with a corrosion-resistant coating resistant to 2300℃ temperature by airless high-pressure spraying, and the thickness is 0.4-0.6mm; 3. The low-expansion alloy blank coated with the high-temperature corrosion-resistant coating is dried by hot air at 50-70℃ for 10 hours to complete low-temperature curing of the surface high-temperature corrosion-resistant coating.

2. The ALD coating process for low expansion alloy forging for photoelectric products according to claim 1, characterized in that: The low-expansion alloy blank after low-temperature curing of the surface high-temperature corrosion-resistant coating is heated to 850-900℃ in a vacuum furnace, and is kept for 0.5-2.0 hours and air-cooled to room temperature to complete high-temperature curing of the surface high-temperature corrosion-resistant coating; the low-expansion alloy blank after high-temperature curing of the surface high-temperature corrosion-resistant coating is heated from room temperature to 1150-1200℃ at a heating rate of 30-40℃ / hour, and is kept for 2 hours; and then it is forged to the required size in one time.

3. The ALD coating process for low expansion alloy forging for photoelectric products according to claim 1, characterized in that: The low-expansion alloy blank after low-temperature curing of the surface high-temperature corrosion-resistant coating is heated to 1150-1200℃ in a vacuum furnace at a heating rate of 30-40℃ / hour, and is kept for 2 hours; and then it is forged to the required size in one time.