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Preparation method of Y2O3-MgO nano complex-phase infrared transparent ceramic

A transparent ceramic, y2o3-mgo technology, applied in the static field, can solve problems such as difficulty in preparing large-scale high-performance samples, carbon pollution, etc., and achieve the effect of facilitating large-scale industrial production, reducing production costs, and small grain size

Inactive Publication Date: 2020-03-27
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these studies also have some shortcomings. The two-step sintering process without pressure assistance cannot prepare Y with high infrared transmittance. 2 o 3 -MgO nanocomposite ceramics; carbon contamination also exists in samples prepared by pressure-assisted hot-pressing two-step sintering method, and it is not easy to prepare large-scale high-performance samples

Method used

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  • Preparation method of Y2O3-MgO nano complex-phase infrared transparent ceramic
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  • Preparation method of Y2O3-MgO nano complex-phase infrared transparent ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0040] will use Y 2 o 3 The ratio of the amount of nanopowder and MgO nanopowder is 1:4, and the uniformly mixed Y 2 o 3 -The biscuit pressed by MgO composite nano-powder is placed in a muffle furnace to perform a two-step sintering process in an air atmosphere. The sintering temperature of the first step is controlled at 1400°C, the heating rate is 10°C / min, and the holding time is 0min. ; then lower the temperature to 1290°C at a cooling rate of 50°C / min, start the second step of sintering, and keep it warm for 30 hours, and obtain a dense ceramic body after natural cooling; then use a hot isostatic pressing furnace to sinter the above ceramic body Carry out hot isostatic pressing sintering, the sintering temperature is 1300 ℃, the holding time is 2 hours, the pressure of Ar gas atmosphere is 200 MPa, the heating and cooling rate are 10 ℃ / min, and the dense ceramic sample is obtained; the sample is heated at 1000 ℃ for 15 hours, the heating and cooling rates are 3 ℃ / min; ...

Embodiment 2

[0044] will use Y 2 o 3 The ratio of the amount of nanopowder and MgO nanopowder is 1:6, and the uniformly mixed Y 2 o 3 -The biscuit pressed by MgO composite nano-powder is placed in a muffle furnace to perform a two-step sintering process in an air atmosphere. The sintering temperature of the first step is controlled at 1300°C, the heating rate is 1°C / min, and the holding time is 30min. ; Then cool down to 1270°C at a cooling rate of 1°C / min, start the second step of sintering, and keep it warm for 100 hours, and obtain a dense ceramic green body after natural cooling; then use a hot isostatic pressing furnace to sinter the above ceramic green body Carry out hot isostatic pressing sintering, the sintering temperature is 1200 ℃, the holding time is 5 hours, the pressure of Ar gas atmosphere is 50 MPa, the heating and cooling rate are 5 ℃ / min, and the dense ceramic sample is obtained; the sample is heated at 1250 ℃ for 5 hours, the heating and cooling rates are both 2 ℃ / min...

Embodiment 3

[0048] will use Y 2 o 3 The ratio of the amount of nanopowder and MgO nanopowder is 1:2 uniformly mixed Y 2 o 3 -The biscuit pressed by MgO multiphase nanopowder is placed in a muffle furnace to perform a two-step sintering process in an air atmosphere. The sintering temperature of the first step is controlled at 1600°C, the heating rate is 60°C / min, and the holding time is 5min. ; Then cool down to 1200°C at a cooling rate of 300°C / min, start the second step of sintering, and keep it warm for 50 hours, and obtain a dense ceramic green body after natural cooling; then use a hot isostatic pressing furnace to sinter the above ceramic green body Carry out hot isostatic pressing sintering, the sintering temperature is 1500 ° C, the holding time is 0.5 hours, the pressure of Ar gas atmosphere is 250 MPa, the heating and cooling rates are 15 ° C / min, and the dense ceramic sample is obtained; the sample is heated at 1150 ℃ for 10 hours, the heating and cooling rates are both 5 ℃...

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Abstract

The invention relates to a preparation method of Y2O3-MgO nano complex-phase infrared transparent ceramic. The preparation method comprises the following steps: firstly pressing Y2O3-MgO complex-phasenano-powder into a biscuit, carrying out a two-step sintering process in a muffle furnace in an air atmosphere to obtain a ceramic blank and then carrying out hot isostatic pressing sintering to obtain the infrared transparent Y2O3-MgO nanovcomplex-phase ceramic. The density is close to the theoretical density, the grain size is small, the average transmittance (thickness is 2.0 mm) of mid-infrared 3-6 microns is greater than 76% so as to be superior to that of a sample prepared through conventional auxiliary hot isostatic pressing sintering after sintering.

Description

technical field [0001] The invention relates to an infrared wide band, high transmittance Y 2 o 3 -The preparation method of MgO nano-composite ceramics, specifically related to Y 2 o 3 -MgO multi-phase nano-powder is pressed into a green body, and a dense ceramic green body is obtained through a two-step sintering process, and then a fine-grained and dense Y is prepared by hot isostatic pressing. 2 o 3 - MgO nanocomposite infrared transparent ceramics and products thereof. Background technique [0002] The infrared window / dome has good mechanical, thermal, optical and other properties, and plays an important role in protecting the precision photoelectric components inside the infrared photoelectric system and transmitting target infrared signals for the detector / sensor, and is a prerequisite for ensuring the accuracy of infrared guidance condition. With the continuous development of supersonic aircraft from supersonic to hypersonic, the infrared window / dome is facing ...

Claims

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Application Information

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IPC IPC(8): C04B35/053C04B35/64C04B35/645
CPCC04B35/053C04B35/64C04B35/6455C04B2235/3225C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/6583C04B2235/662C04B2235/785C04B2235/96C04B2235/9653
Inventor 范金太沈宗云钱凯臣张龙冯涛姜本学冯明辉张戈王魏马婉秋黄鑫
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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