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Mid-wave infrared window and preparation method thereof

An infrared window and medium-wave technology, which is applied in the field of high-temperature-resistant and high-strength medium-wave infrared windows and its preparation, can solve the problems of Y-TZP ceramics that are difficult to obtain optical transmittance and difficult-to-transparent ceramics, and achieve high strength and step-by-step Simple, high transmittance effect

Active Publication Date: 2022-03-08
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the tetragonal crystal form, it is difficult for Y-TZP ceramics to obtain good optical transmittance, and it has long been considered difficult to be used as a transparent ceramic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Containing 2.5mol% Y with an average particle diameter of 20-50 nanometers 2 o 3 ZrO 2 Nano-powder is used as the raw material, and the purity of the raw material is 99.99%. The SPS sintering method is used to install the powder to be sintered in the graphite mold, and the pressure of 50MPa is maintained during the sintering process; the temperature is raised to the highest temperature at a speed of 100°C / min in a vacuum atmosphere. 1100°C, the holding time is 5-30min, and the preferred holding time is 10min.

[0021] The samples after SPS sintering were heated to 1000°C in air and annealed for 10-20h to eliminate residual defects during vacuum SPS sintering.

[0022] After annealing, both sides of the sample were polished, and a sample with a thickness of 3 mm was used as a sample for optical performance testing. The strength test is carried out in accordance with the requirements of the fine ceramic strength test standard; the optical transmittance is tested in an ...

Embodiment 2

[0029] Containing 3mol% Y with an average particle diameter of 50-100 nanometers 2 o 3 ZrO 2 Nano powder is used as the raw material, the purity of the raw material is 99.99%; the green body is pressed at 200MPa by cold isostatic pressing method; the obtained green body is pre-sintered in vacuum or air atmosphere, the sintering temperature is 1300°C, and the time is 3h; then the obtained pre-sintered The sintered body was placed in a HIP furnace, and Ar was used as the pressurized medium, and treated at 1250°C and 200MPa for 3h.

[0030] Gained product is through after the annealing treatment identical with embodiment 1, and processing and test process are also identical with embodiment 1.

[0031] The test results are as follows:

[0032] Bending strength: 1230MPa;

[0033] Average grain size 580nm;

[0034] 3.7-4.8μm band infrared transmittance: 75% (room temperature ~ 300 ℃);

[0035] Infrared radiation coefficient: 0.03 (at 300°C), 0.02 (at room temperature to 250°C)...

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Abstract

A mid-wave infrared window and its preparation method, the mid-wave infrared window is Y 2 o 3 Stabilized tetragonal polycrystalline zirconia ceramics starting from 2.5‑3.0 mol% Y 2 o 3 ZrO 2 Nano powder, the average grain size of ceramics is 200‑600nm. It is obtained by spark plasma sintering (SPS) or hot isostatic pressing (HIP) sintering. The medium-wave infrared window of the present invention can be used in the range from room temperature to 300°C, and the transmittance in the 3.7-4.8μm medium-wave infrared band is not less than 75%; the radiation coefficient in the range of 0-300°C is not greater than 0.05; the bending strength is not less than 1000MPa . Infrared fairings that can be used for hypersonic missiles, or medium-wave infrared windows for other high-temperature applications.

Description

technical field [0001] The invention relates to a mid-wave infrared window, in particular to a high-temperature resistant and high-strength mid-wave infrared window and a preparation method thereof. Background technique [0002] Infrared detection technology occupies a very important position in modern national defense technology. Many fields such as guidance of various missiles, infrared early warning, observation and aiming (high-energy beam interception weapons, etc.) involve infrared detection technology. The infrared window is an important part of the missile's infrared seeker, which plays the role of protecting the components of the internal detection system, and at the same time can effectively transmit infrared signals. [0003] In recent years, with the speed of missiles and other aircraft getting faster and faster, the infrared window is subjected to high-speed friction of the atmosphere, and the aerothermal effect makes the temperature of the infrared photoelectri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/488C04B35/64
Inventor 毛小建张龙冯明辉姜本学
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI