Preparation method of nitric oxide transparent ceramic with wide frequency and light transmission performance

A technology of transparent ceramics and oxynitride is applied in the preparation of broadband light-transmitting oxynitride transparent ceramics and in the field of static pressure post-treatment preparation, achieving the effects of high preparation efficiency, low energy consumption and good optical uniformity of products

Active Publication Date: 2015-03-25
THE 3RD ACAD 8358TH RES INST OF CASC
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Problems solved by technology

Based on the above background, the author intends to invent a pressureless sintering / hot isostatic pressing post-treatment process for the preparation of MgAlON transparent ceramics, which has not been reported before.

Method used

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  • Preparation method of nitric oxide transparent ceramic with wide frequency and light transmission performance
  • Preparation method of nitric oxide transparent ceramic with wide frequency and light transmission performance
  • Preparation method of nitric oxide transparent ceramic with wide frequency and light transmission performance

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preparation example Construction

[0028] Specifically, the preparation method of the broadband light-transmitting MgAlON transparent ceramic of the present invention comprises the following steps:

[0029] 1) Using MgAlON powder as raw material, after pretreatment, powder A is obtained. Further, the synthesis process of the MgAlON raw material powder is as follows: active C powder, γ-Al 2 o 3 or α-Al 2 o 3 MgO powder and MgO powder are used as raw materials, and the raw materials are weighed according to the proportions of 3.0-6.5%, 86.0-92.0%, and 4.0-10.0% respectively. After mixing and drying, they are placed in a graphite carbon tube furnace and heated to 1500~ 1650 DEG C for 0.5-2h, and naturally cooled to obtain MgAlON powder; further, the pretreatment process is as follows: add a certain amount of MgAlON powder and a certain amount (0.1-1.0% of the mass of MgAlON powder) of fluorine Compound powder, such as LiF, CaF 2 or YF 3 As a sintering aid, wear-resistant alumina or zirconia balls are used as...

Embodiment 1

[0037] a) MgAlON powder is used as raw material, and powder A is obtained through pretreatment. Further, the synthesis process of the MgAlON raw material powder is as follows: active C powder, γ-Al 2 o 3 , MgO powder as a raw material, according to the mass fraction of 3.0%, 92.0%, 5.0% of the raw material by weighing a total of 30g, after mixing and drying, placed in a graphite carbon tube furnace, heated to 1650 ° C for 0.5h, naturally Cool to get MgAlON powder; further, the pretreatment process is like this: get MgAlON powder 20g and 0.02g CaF 2 As a sintering aid, wear-resistant alumina is used as the ball milling medium, absolute ethanol is used as the dispersion medium, the ball-to-material ratio is 12:1, and the ball milling time is 10 hours to obtain a slurry; the resulting slurry is dried at 50°C to remove the dispersion medium , placed in an agate mortar and ground for 0.5h, and then sieved at 70 mesh to obtain powder A;

[0038] b) The powder A is molded, and the...

Embodiment 2

[0044] a) MgAlON powder is used as raw material, and powder A is obtained through pretreatment. Further, the synthesis process of the MgAlON raw material powder is as follows: active C powder, γ-Al 2 o 3 , MgO powder as the raw material, according to the proportion of 6.5%, 86.0% and 7.5% of the mass fraction, weigh a total of 60g of the raw material, after mixing and drying, put it in a graphite carbon tube furnace, raise the temperature to 1500 ° C for 2 hours, and cool it naturally , to obtain MgAlON powder; further, the pretreatment process is as follows: take 40g of MgAlON powder and 0.4g LiF as sintering aids, use wear-resistant zirconia balls as ball milling medium, absolute ethanol as dispersion medium, ball The material ratio was 4:1, and the ball milling time was 24 hours to obtain a slurry; the obtained slurry was dried at 75°C to remove the dispersion medium, then placed in an agate mortar and ground for 0.5 hours, and then sieved at 70 mesh to obtain powder A;

...

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Abstract

The invention relates to a preparation method of a nitric oxide transparent ceramic with wide frequency and light transmission performance, and in particular relates to a pressureless sintering/hot isostatic pressure post-treatment preparation process method of MgAlON with wide frequency and light transmission performance. The method mainly comprises the following steps: 1) performing pre-treatment on MgAlON powder serving as a raw material to obtain powder A; 2) performing compression molding on the powder A, and performing cold isostatic pressure again to obtain a bisque B; 3) calcining the bisque B for a certain time at a low temperature to obtain a bisque C; 4) putting the bisque C into a high-temperature sintering furnace for performing pressureless sintering to obtain a sample D; and 5) performing hot isostatic pressure treatment on the sample D to obtain a sample E. The light transmission range of the obtained sample E is 0.2-6.5 microns, and the highest transmittance can reach 84 percent. The method has the advantages of high preparation efficiency, low energy consumption, high optical uniformity of products, high process stability and the like, and the MgAlON transparent ceramic with wide frequency and light transmission performance can be applied to infrared windows, antenna housings, high-energy white-light LED lampshade and the like.

Description

technical field [0001] The invention belongs to the field of ceramic material preparation, and relates to a preparation method of broadband light-transmitting nitrogen oxide transparent ceramics, in particular to a pressureless sintering / hot isostatic pressing post-treatment preparation process of MgAlON transparent ceramics with broadband light transmission performance method. Background technique [0002] Aluminum oxynitride (AlON) is a high-temperature cubic phase “Al 2 o 3 "Structure. In 1979, McCauley et al. prepared the first optically transparent AlON ceramics, that is, AlON transparent ceramics. Research by Raytheon company showed that AlON transparent ceramics have excellent mechanical, thermal, optical and high temperature stability, etc., in addition It can be prepared at low cost by the traditional ceramic sintering method, so it is expected to replace sapphire materials, and shows broad application prospects in infrared optical windows, radomes, light-weight a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 王跃忠张荣实田猛张锋
Owner THE 3RD ACAD 8358TH RES INST OF CASC
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