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Technique for preparing transparent aluminum oxynitride ceramic

A technology for the preparation of aluminum oxynitride, which is applied in the field of preparation of transparent aluminum oxynitride ceramics. It can solve the problems of increased equipment requirements, high sintering temperature, and constant holding time, and achieves reduced production costs, lower sintering temperatures, and excellent performance. Effect

Inactive Publication Date: 2007-09-12
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the above two patented technologies are that the sintering temperature is high and the holding time is long, which increases the requirements for equipment and increases the cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Ingredients: use 95 grams of 0.01μm AI 2 o 3 Mix with 5 g of 0.01 μm AIN and 0.1 g of sintering aid, and ball mill in absolute ethanol for 8 hours, wherein the composition of the sintering aid is 1 μm of Y 2 o 3 0.05 g and 1 µm CaF 2 0.05 grams;

[0018] 2. Green body molding: dry the ingredients of the ball mill, then dry press at 20MPa, and then press into a green body at 200MPa isostatic pressure;

[0019] 3. Sintering process: Sinter the green body in a chemical vapor infiltration furnace, first biscuit, then raise the temperature to 800°C in a vacuum state at a heating rate of 6°C / min and keep it warm for 0.5 hours, then cool it down to room temperature, and then fire it again , at a heating rate of 6°C / min, under nitrogen atmosphere, under normal pressure, the temperature was raised to 1850°C for 1 hour, and transparent aluminum oxynitride ceramics were obtained.

[0020] The sample is polished to a thickness of 1mm on both sides, and the transmittance in ...

Embodiment 2

[0022] 1. Ingredients: use 90 grams of 5μm AI 2 o 3 Mix with 10 grams of 5 μm AIN and 2 grams of sintering aid, and ball mill in absolute ethanol for 24 hours, wherein the composition of the sintering aid is 1 μm of Y 2 o 3 1 g, 1 μm CaF 2 1 g;

[0023] 2. Green body molding: Dry the ingredients of the ball mill, then dry press them at 30MPa, and then press them into a green body at 250MPa isostatic pressure;

[0024] 3. Sintering process: sinter the green body in a chemical vapor infiltration furnace, first bisque-fired, then rise to 800°C in a vacuum state at a heating rate of 10°C / min and hold for 0.5 hours, cool down to room temperature, and then fire again , at a heating rate of 10°C / min, under nitrogen atmosphere, under normal pressure, the temperature was raised to 1850°C for 1 hour, and transparent aluminum oxynitride ceramics were obtained.

[0025] The sample is polished to a thickness of 1mm on both sides, and the transmittance in the ultraviolet region (200-47...

Embodiment 3

[0027] 1. Ingredients: choose 80 grams of 50μm AI 2 o 3 Mix with 20 grams of 50 μm Al powder and 9 grams of sintering aid, and ball mill in absolute ethanol for 48 hours, wherein the composition of the sintering aid is 3 grams of 1 μm Al powder, 1 μm Y 2 o 3 3 g, 1 μm CaF 2 3 grams;

[0028] 2. Green body molding: dry the ingredients of the ball mill, then dry press at 50MPa, and then press into a green body at 250MPa isostatic pressure;

[0029] 3. Sintering process: sinter the green body in a chemical vapor infiltration furnace, first biscuit, then rise to 800°C in a vacuum state at a heating rate of 15°C / min and keep it warm for 0.5 hours, cool down to room temperature, and then fire again , with a heating rate of 15°C / min in a nitrogen atmosphere, after rising to 1900°C under normal pressure for 0.5 hours, transparent aluminum oxynitride ceramics were obtained.

[0030] The sample is polished to a thickness of 1mm on both sides, and the transmittance in the ultraviole...

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Abstract

This invention relates to a preparation method for transparent nitrogen alumina ceramics including mixing raw materials, molding blanks and sintering characterizing in mixing Al2O3 in the weight ratio of 80-95% and AlN of 5-20%, adding sintering aids in 0.1-9% of the mixture weight to be ball-milled and dried then pressed and molded, then to get the blank in equal static pressure, then biscuit firing the blank by rising the temperature to 800-1200deg.C for 0.5-3h, then lowering the temperature and firing the second time by sintering at normal pressure under N atmosphere and rises the temperature to 1800-1900deg.C for 0.5-8h to get a transparent nitrogen alumina ceramic material.

Description

Technical field [0001] The invention provides a preparation process of transparent aluminum oxynitride ceramics, which belongs to the field of preparation of ceramic materials. Background technique [0002] AlON ceramics have excellent optical, physical, mechanical and chemical properties, especially its isotropy, and can be made into transparent ceramics by high-temperature sintering, so it is the preferred material for high-temperature resistant infrared windows and covers, but there are few domestic studies. For example, in Wang Xidong's paper "Research on Hot Press Synthesis of AlON Ceramics" published in "Journal of Silicates" in January 2001, AI 2 o 3 , AIN and AI powder as raw materials, at 1800°C, 25MPa, N 2 High-purity AlON ceramics were synthesized by hot pressing and sintering in atmosphere for 3h. The bulk density of the prepared AlON sample is 3.63g / cm 3 , about 97.8% of its theoretical value. The disadvantage is that the density is not high, and the hot pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/115C04B35/581C04B35/50C04B35/553C22C29/00
Inventor 田贵山魏春城孟凡涛
Owner SHANDONG UNIV OF TECH
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