Modification treatment method for surface of space material reflector blank

Abstract

The invention discloses a modification treatment method for surface of a space material reflector blank. The modification treatment method comprises the steps that S1, the reflector blank is pretreated, specifically, a zinc dipping solution is used for treating the modified surface of the space material reflector blank, and a transition layer is generated on the modified surface of the space material reflector blank; and S2, modification treatment is conducted, specifically, the pretreated space material reflector blank is treated through a modification treatment solution, and a nickel-phosphorus alloy modified layer is deposited on the modified surface of the space material reflector blank. By means of the modification treatment method for the surface of the space material reflector blank, the nickel-phosphorus alloy modified layer with the microhardness being HV 400-780, the melting point being not lower than 890 DEG C, the thermal expansion coefficient being (7.8-9.4) * 10<-6> / DEG Cand the porosity being lower than 5% can be deposited on the surface of the reflector blank through a chemical deposition method, the surface defect grade of the nickel-phosphorus alloy modified layer is IV, the modification treatment method is suitable for optical ultra-precision machining, and an ultra-smooth surface with the root mean square value being 0.049 lambda, the roughness being superior to 2nm and the surface defect grade being IV can be obtained through optical precision polishing.

Description

technical field

[0001] The invention relates to the technical field of optical processing and detection, in particular to a modified layer containing nickel (75% to 95%) and phosphorus (5% to 15%) to deposit a modified layer for aluminum alloy, beryllium alloy, beryllium aluminum alloy, ~A method for modifying the surface of a space material reflector blank such as silicon carbide. Background technique

[0002] High-precision optical manufacturing technology and the requirement for ultra-smooth surfaces of space materials in space optical systems are bottleneck technologies in the development of advanced optical systems, which largely restrict space-to-earth observation, ground tracking, space detection, astronomy and high-end Technical development of civilian optical products. Among them, the light weight and imaging quality of the optical imaging system are two focal issues that need to be solved urgently. At the same time, it is also required that the optical system can...

Examples

Embodiment 1

[0066] Embodiment 1: Surface modification treatment of LD5 mirror blank

[0067] 1) Chemical degreasing of the mirror blank: according to the ratio of 20g / L of hydroxide, 15g / L of sodium silicate, 20g / L of sodium carbonate, and 15g / L of sodium phosphate, add the above-mentioned medicines into deionized water, mix evenly, and obtain chemical Degreasing solution, working temperature is 60°C. Immerse the LD5 reflector blank in the chemical degreasing solution, take it out after 15 minutes of degreasing, and observe whether a continuous water film is formed on the surface of the mirror blank after cleaning with deionized water, if not, continue to immerse in the chemical degreasing solution to remove oil until A uniform and continuous water film is formed on the surface of the mirror blank.

[0068] 2) Treatment for protecting the non-modified surface: coating the non-modified surface of the LD5 mirror blank after chemical degreasing with peelable protective glue.

[0069] 3) Mo...

Embodiment 2

[0073] Example 2: Surface modification treatment of Al-SiC mirror blank

[0074] The difference between embodiment 2 and embodiment 1 is that the proportioning of modification treatment solution is different, and embodiment 2 is by nickel sulfate 40g / L, sodium hypophosphite 20g / L, sodium citrate 20g / L, sodium acetate 15g / L, The ratio of lead sulfate 0.8mg / L is prepared, and the pH value of the modification treatment solution is adjusted to 5 with acetic acid, and the temperature of the modification treatment solution is controlled at 93°C. Dip the mirror base dipped in the aluminum and aluminum alloy zinc immersion solution in the modification treatment solution, react for 20 hours, and complete the preparation of the modification layer.

[0075] The thickness of the nickel-phosphorus alloy modified layer obtained in Example 2 of the present invention was measured by a microhardness meter to be 115 μm, the microhardness was 541 Hv, and the phosphorus content was 10.5%. After t...

Embodiment 3

[0076] Embodiment 3: Surface modification treatment of Al (7A09) mirror blank

[0077] The difference between Example 3 and Example 1 is that the proportions of the modified pretreatment solution and the modified treatment solution are different.

[0078] Embodiment 3 According to the ratio of sodium hydroxide 400g / L, zinc oxide 20g / L, cuprous cyanide accelerator 15g / L, above-mentioned medicine is added in deionized water, mix uniformly, obtain aluminum and aluminum alloy zinc dipping solution, put Al(7A09) mirror blank is immersed in aluminum and aluminum alloy zinc dipping solution for 40 seconds.

[0079] The modified layer solution was prepared according to the ratio of nickel sulfate 30 / L, sodium hypophosphite 10g / L, sodium citrate 15g / L, sodium acetate 10g / L, lead sulfate 0.5mg / L, and the modified layer was mixed with acetic acid The pH value of the solution was adjusted to 5, and the temperature of the modified layer solution was controlled to be 92°C. Dip the mirror ...

technical field

[0001] The invention relates to the technical field of optical processing and detection, in particular to a modified layer containing nickel (75% to 95%) and phosphorus (5% to 15%) to deposit a modified layer for aluminum alloy, beryllium alloy, beryllium aluminum alloy, ~A method for modifying the surface of a space material reflector blank such as silicon carbide. Background technique

[0002] High-precision optical manufacturing technology and the requirement for ultra-smooth surfaces of space materials in space optical systems are bottleneck technologies in the development of advanced optical systems, which largely restrict space-to-earth observation, ground tracking, space detection, astronomy and high-end Technical development of civilian optical products. Among them, the light weight and imaging quality of the optical imaging system are two focal issues that need to be solved urgently. At the same time, it is also required that the optical system can...

Examples

Embodiment 1

[0066] Embodiment 1: Surface modification treatment of LD5 mirror blank

[0067] 1) Chemical degreasing of the mirror blank: according to the ratio of 20g / L of hydroxide, 15g / L of sodium silicate, 20g / L of sodium carbonate, and 15g / L of sodium phosphate, add the above-mentioned medicines into deionized water, mix evenly, and obtain chemical Degreasing solution, working temperature is 60°C. Immerse the LD5 reflector blank in the chemical degreasing solution, take it out after 15 minutes of degreasing, and observe whether a continuous water film is formed on the surface of the mirror blank after cleaning with deionized water, if not, continue to immerse in the chemical degreasing solution to remove oil until A uniform and continuous water film is formed on the surface of the mirror blank.

[0068] 2) Treatment for protecting the non-modified surface: coating the non-modified surface of the LD5 mirror blank after chemical degreasing with peelable protective glue.

[0069] 3) Mo...

Embodiment 2

[0073] Example 2: Surface modification treatment of Al-SiC mirror blank

[0074] The difference between embodiment 2 and embodiment 1 is that the proportioning of modification treatment solution is different, and embodiment 2 is by nickel sulfate 40g / L, sodium hypophosphite 20g / L, sodium citrate 20g / L, sodium acetate 15g / L, The ratio of lead sulfate 0.8mg / L is prepared, and the pH value of the modification treatment solution is adjusted to 5 with acetic acid, and the temperature of the modification treatment solution is controlled at 93°C. Dip the mirror base dipped in the aluminum and aluminum alloy zinc immersion solution in the modification treatment solution, react for 20 hours, and complete the preparation of the modification layer.

[0075] The thickness of the nickel-phosphorus alloy modified layer obtained in Example 2 of the present invention was measured by a microhardness meter to be 115 μm, the microhardness was 541 Hv, and the phosphorus content was 10.5%. After t...

Embodiment 3

[0076] Embodiment 3: Surface modification treatment of Al (7A09) mirror blank

[0077] The difference between Example 3 and Example 1 is that the proportions of the modified pretreatment solution and the modified treatment solution are different.

[0078] Embodiment 3 According to the ratio of sodium hydroxide 400g / L, zinc oxide 20g / L, cuprous cyanide accelerator 15g / L, above-mentioned medicine is added in deionized water, mix uniformly, obtain aluminum and aluminum alloy zinc dipping solution, put Al(7A09) mirror blank is immersed in aluminum and aluminum alloy zinc dipping solution for 40 seconds.

[0079] The modified layer solution was prepared according to the ratio of nickel sulfate 30 / L, sodium hypophosphite 10g / L, sodium citrate 15g / L, sodium acetate 10g / L, lead sulfate 0.5mg / L, and the modified layer was mixed with acetic acid The pH value of the solution was adjusted to 5, and the temperature of the modified layer solution was controlled to be 92°C. Dip the mirror ...

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