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Method for rapidly preparing LiAlON transparent ceramic powder

A technology for transparent ceramics and powders, applied in the field of preparing LiAlON transparent ceramic powders, can solve problems such as different synthesis processes, and achieve the effects of uniform particle size, high efficiency and low energy consumption

Active Publication Date: 2011-11-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the reported LiAlON reaction sintering process is a pressure sintering process, which is different from the synthesis process of its powder.

Method used

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  • Method for rapidly preparing LiAlON transparent ceramic powder
  • Method for rapidly preparing LiAlON transparent ceramic powder
  • Method for rapidly preparing LiAlON transparent ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of method for fast preparation LiAlON transparent ceramic powder, it comprises the steps:

[0033] 1) Weigh 87.25g of α-alumina powder, 3.04g of aluminum nitride powder and 9.71g of lithium oxide powder, and mix them in a mixing bottle to obtain a mixed powder; : 1 Add alumina balls, add 200mL absolute ethanol, and roll ball mill for 24 hours to obtain slurry;

[0034] 2) drying the slurry in step 1) (drying in vacuum at 50°C) to obtain a mixture;

[0035]3) Pass the dried mixture through a 100-mesh sieve, take 3g and put it into a graphite crucible coated with boron nitride on the inner wall. The crucible is placed in a graphite reactor, and the graphite reactor is placed in a high-current reaction synthesis device. 0.05Mpa nitrogen was introduced into the synthesis device as a protective gas; a large flow was directly applied to the graphite reactor, heated to 1700°C at a heating rate of 100°C / min, kept at this temperature for 10min, and then naturally lowered...

Embodiment 2

[0038] A kind of method for fast preparation LiAlON transparent ceramic powder, it comprises the steps:

[0039] 1) Weigh 93.51g of α-alumina powder, 5.99g of aluminum nitride powder and 0.5g of lithium oxide powder, and mix them in a mixing bottle to obtain a mixed powder; : 1 Add alumina balls, add 200mL absolute ethanol, and roll ball mill for 24 hours to obtain slurry;

[0040] 2) drying the slurry in step 1) (drying in vacuum at 50°C) to obtain a mixture;

[0041] 3) Pass the dried mixture through a 100-mesh sieve, take 3g and put it into a graphite crucible coated with boron nitride on the inner wall. The crucible is placed in a graphite reactor, and the graphite reactor is placed in a high-current reaction synthesis device. Introduce 0.02Mpa nitrogen into the synthesis device as a protective gas; directly apply a large flow to the graphite reactor, heat it up to 1650°C at a heating rate of 200°C / min, keep it at this temperature for 5min, and then cool it down to room t...

Embodiment 3

[0044] A kind of method for fast preparation LiAlON transparent ceramic powder, it comprises the steps:

[0045] 1) Weigh 75.12g of α-alumina powder, 14.92g of aluminum nitride powder and 9.96g of lithium carbonate powder, and mix them in a mixing bottle to obtain a mixed powder; : 1 Add alumina balls, add 250mL absolute ethanol, and roll ball mill for 24 hours to obtain slurry;

[0046] 2) drying the slurry in step 1) (drying in vacuum at 50°C) to obtain a mixture;

[0047] 3) Pass the dried mixture through a 100-mesh sieve, take 3g and put it into a graphite crucible coated with boron nitride on the inner wall. The crucible is placed in a graphite reactor, and the graphite reactor is placed in a high-current reaction synthesis device. 0.05Mpa nitrogen was introduced into the synthesis device as a protective gas; a large flow was directly applied to the graphite reactor, heated to 1600°C at a heating rate of 300°C / min, kept at this temperature for 2min, and then naturally co...

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Abstract

The invention relates to a method for rapidly preparing LiAlON transparent ceramic powder. The method comprises the following steps: 1) mixing alpha-aluminum oxide powder, aluminum nitride powder and lithium-containing compound powder according to a certain ratio to obtain a mixed powder material; dispersing the mixed powder material in dehydrated alcohol, carrying out ball milling for at least 24 hours to obtain slurry; 2) drying the slurry from the step 1) to obtain a mixture; 3) placing the dried mixture in a copple, placing the copple in a graphite reactor, directly exerting high current on the copple, and heating the copple to 1400-1800 DEG C at a heat rate of 100-400 DEG C per minute, then holding for 0-30 minutes, followed by carrying out natural cooling to obtain the LiAlON transparent ceramic powder. With the present invention, the method has characteristics of simple process, rapid synthesis speed, high preparation efficiency and the like; the prepared LiAlON transparent ceramic powder has high purity (more than or equal to 98wt%), uniform and small particle size (mean particle size less than or equal to 700 nm). In addition, the method provided by the present invention is substantially applicable for preparing the transparent ceramic.

Description

technical field [0001] The invention relates to a method for preparing LiAlON transparent ceramic powder, which belongs to the field of synthesis and preparation of ceramic materials. Background technique [0002] γ-AlON has excellent high-temperature performance, corrosion resistance and thermal shock stability, and is an ideal high-temperature structural ceramic and refractory material. In addition, because of its excellent optical properties, γ-AlON can also be widely used as an optically transparent material in optical windows and fairings. However, γ-AlON has poor thermal stability below 1640 °C. Studies have shown that the formation of a new single LiAlON phase by solid-solution of metal lithium ions in γ-AlON is beneficial to improve the thermal stability and hardness of transparent ceramics. and other mechanical properties. LiAlON material is a new type of optical ceramic material with spinel structure, which has excellent physical and chemical properties such as o...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
Inventor 王皓刘啸王为民傅正义王玉成张清杰
Owner WUHAN UNIV OF TECH
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