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Low-temperature preparation method of AlON (aluminum oxynitride) transparent ceramic

A transparent ceramic, low temperature technology, which is applied in the preparation of high transmittance aluminum oxide nitride ceramics and the preparation of transparent ceramics, achieves the effects of high product quality, convenient operation and simple process

Active Publication Date: 2019-09-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Over the years, there have been many studies on the mechanism of action of additives, but many conclusions about the mechanism have not been widely recognized. In the early days, there were many studies on the addition of MgO, La 2 o 3 and Y 2 o 3 Preparation of translucent Al 2 o 3 ceramic report

Method used

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  • Low-temperature preparation method of AlON (aluminum oxynitride) transparent ceramic
  • Low-temperature preparation method of AlON (aluminum oxynitride) transparent ceramic
  • Low-temperature preparation method of AlON (aluminum oxynitride) transparent ceramic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this embodiment, a low-temperature preparation method of AlON transparent ceramics includes the following steps:

[0044] a. Using high-purity AlON powder as raw material, weigh 30g of AlON powder and put it into an alumina ball mill jar, put 600g of alumina balls with a diameter of 5mm, and add absolute ethanol with 0.8 times the powder mass as the ball milling medium; The purity of the dehydrated ethanol is not lower than the purity of analytical grade; add dehydrated ethanol to make a slurry, and the high-purity AlON powder is made of Al 2 o 3 / C mixture synthesized by carbothermal reduction method, the powder purity is 99%, the median particle size is 56.3μm, and the specific surface area (BET) is 0.316m 2 / g; Put the prepared ball mill tank into the omnidirectional planetary ball mill and mill it at 250r / min for 24 hours to crush and modify the AlON powder. After the ball mill is broken, put the slurry in the container, and then Put the ball-milled slurry into...

Embodiment 2

[0054] This embodiment is basically the same as Embodiment 1, especially in that:

[0055] In this embodiment, a low-temperature preparation method of AlON transparent ceramics includes the following steps:

[0056] a. This step is the same as in Embodiment 1;

[0057] b. Weigh 15g of the submicron single-phase AlON powder obtained after ball milling in the step a and pack it into a polytetrafluoroethylene tank, then weigh the 0.4% MgO sintering aid of the submicron single-phase AlON powder quality Put the agent into a polytetrafluoroethylene tank for mixing to obtain a mixed powder, then put 150.9 g of alumina balls with a diameter of 5 mm, use absolute ethanol as the ball milling medium, and add anhydrous ethanol with 1 times the powder mass as the ball milling medium , put the prepared ball mill tank into the omni-directional planetary ball mill and mill at 250r / min for 12 hours, put the slurry in the container after the ball mill is mixed, put it in the drying oven for 20...

Embodiment 3

[0065] This embodiment is basically the same as the previous embodiment, and the special features are:

[0066] In this embodiment, a low-temperature preparation method of AlON transparent ceramics includes the following steps:

[0067] a. This step is the same as in Embodiment 1;

[0068] b. Weigh 30g of the submicron single-phase AlON powder obtained after ball milling in step a and put it into a nylon tank, then weigh the 0.6% MgO sintering aid of the submicron single-phase AlON powder quality and put it into Mix in a nylon tank to obtain a mixed powder, put 301.8g of alumina balls with a diameter of 5mm, use absolute ethanol as the ball milling medium, add absolute ethanol with 1 times the powder mass as the ball milling medium, and mill the prepared materials Put the tank into an all-round planetary ball mill and mill it at 250r / min for 12 hours; after the ball mill is mixed, put the slurry in a container, put it in a drying oven for 20 hours at 60°C, and take out the po...

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Abstract

The invention discloses a low-temperature preparation method of a transparent aluminum oxynitride (AlON) ceramic. The method comprises the following steps: carrying out crushing modification on AlON powder by using an all-direction planetary ball mill, adding a single MgO sintering aid into the crushed powder, and carrying out calcining decarbonization on the powder at 600-700 DEG C so as to obtain AlON powder which has the characteristics of being small in particle size, high in sintering activity, and the like; and carrying out dry-pressure and isostatic cool pressing tabletting molding, so as to obtain a blank with a high density, wherein the blank can be subjected to pressureless sintering at 1600-1800 DEG C to make the AlON transparent ceramic with an optical permeation rate of 80% or greater. As only the single sintering aid is used, the method is simple in operation, high in preparation efficiency, low in sintering temperature, low in cost and easy in industrial popularization.

Description

technical field [0001] The invention relates to a preparation method of transparent ceramics, in particular to a preparation method of aluminum oxynitride (AlON) ceramics with high transmittance, which is applied in the technical field of preparation of transparent ceramic materials. Background technique [0002] Polycrystalline AlON transparent ceramic is a visible-infrared dual-band wave-transmitting material with a spinel structure. It has excellent mechanical properties, chemical stability and optical properties. It has broad applications in missile fairings, transparent armor and infrared windows. application prospects. AlON transparent ceramics are mostly artificially finely synthesized powders, which are prepared through special sintering processes. The high sintering temperature (1880-1950°C) determines that its preparation process is relatively difficult. It is of great scientific significance to study the preparation of AlON under low temperature conditions, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/581C04B35/622C04B35/626C04B35/64
CPCC04B35/581C04B35/622C04B35/6261C04B35/64C04B2235/9653C04B2235/3206C04B2235/5445C04B2235/5409C04B2235/6562C04B2235/6567C04B2235/658C04B2235/668
Inventor 孙泽汉施鹰谢建军章蕾雷芳范灵聪丁毛毛
Owner SHANGHAI UNIV
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