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Combustion-synthesis fusion-casting method of Al23O27N5 ceramic

An al23o27n5, combustion synthesis technology, which is applied in the field of combustion synthesis and casting, can solve the problems of difficult control of process parameters, high cost of preparation methods, and high equipment requirements, and achieves the effects of low equipment requirements, rapid synthesis and simple experimental process.

Active Publication Date: 2013-08-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention is to solve existing Al 23 o 27 N 5 The preparation method of ceramics has high cost, difficult control of process parameters, high requirements on equipment and technical problems of producing toxic gases, and an Al 23 o 27 N 5 Method of Combustion Synthesis and Casting of Ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0017] Specific embodiment one: a kind of Al of this embodiment 23 o 27 N 5 The method for the combustion synthesis melting and casting of ceramics is carried out in the following steps:

[0018] 1. Put the aluminum nitrate in a dry box and dry it separately to obtain Al(NO 3 ) 3 Reactant;

[0019] 2. Drying the Al powder in a vacuum oven to obtain the Al powder reactant;

[0020] 3. The diluent is dried in a vacuum drying oven to obtain the diluent; wherein the diluent is made of Al 2 o 3 and AlN, and the Al in the system after the reaction 2 o 3 and AlN 2 The molar ratio is 9:5;

[0021] 4. Al(NO) obtained in step 1 3 ) 3 The reactant, the Al powder reactant obtained in step 2 and the diluent obtained in step 3 are mixed by ball milling, then loaded into the reaction device, ignited the raw materials, and carry out combustion and exothermic reaction. The reaction time is less than 10min, and the reaction temperature is less than 4300K. The pressure is less than ...

specific Embodiment approach 2

[0025] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the drying treatment described in step 1 is realized at a temperature of 40-60° C. and a drying time of 8 hours to 12 hours. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 1 to Embodiment 2 in that: the drying treatment described in step 2 is realized at a temperature of 70-90° C. and a drying time of 8 hours to 12 hours. Other steps and parameters are the same as one of the specific implementation modes 1 to 2.

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Abstract

The invention discloses a combustion-synthesis fusion-casting method of Al23O27N5 ceramic, which is used for solving the technical problems that the existing preparation method of the Al23O27N5 is high in cost and high in equipment requirement, process parameters are not easy to control and generating poisonous gas is generated. According to the combustion-synthesis fusion-casting method of Al23O27N5 ceramic, the reactants are Al and Al(NO3)3, the diluents is Al2O3 and AlN; the reaction is carried out by combusting the materials and utilizing combustion heat release of Al and Al(NO3)3, so that the experimental process is quick, the reaction time is less than 10 minutes, the preparation period is short, an external heat source is not needed, the system is heated up by the heat lease of the reaction, the cost is low and the obtained product is high in purity. Moreover, poisonous gas is not generated, and therefore, the combustion-synthesis fusion-casting method can be applied to the preparation field of Al23O27N5 ceramic.

Description

technical field [0001] The present invention relates to an Al 23 o 27 N 5 Combustion synthesis melting casting method of ceramics. Background technique [0002] Al 23 o 27 N 5 (Aluminum oxynitride, also known as Aron) ceramics have good high temperature resistance, thermal shock stability and corrosion resistance, and can be an ideal high temperature structural ceramics or modern refractory materials. [0003] Al 23 o 27 N 5 The common preparation methods of ceramics mainly include the following: high-temperature solid-state reaction method, alumina reduction nitriding method, hot pressing method, chemical vapor deposition method (CVD) and self-propagating method. [0004] The high-temperature solid-state reaction method uses solid-phase Al 2 o 3 React with AlN at a temperature greater than 1650°C to prepare Al 23 o 27 N 5 . The key to this method is that the AlN powder used must be ultra-fine and high-purity, but high-performance AlN will undoubtedly increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/65
Inventor 郑永挺杨攀赫晓东
Owner HARBIN INST OF TECH