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A method for burning, synthesizing, and casting y3al5o12 ceramics

A technology of y3al5o12 and combustion synthesis, which is applied in the field of combustion synthesis and casting of Y3Al5O12 ceramics, which can solve the problems of sintering cycle and easy generation of impurities for materials with large sizes that are difficult to shape, and achieve the effects of rapid synthesis, low reaction pressure and high efficiency

Active Publication Date: 2014-10-08
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 Y 3 al 5 o 12 In the preparation process of ceramics, it is easy to produce impurity phases, it is difficult to form large-sized materials and the technical problems of long sintering cycle, and a Y 3 al 5 o 12 Method of Combustion Synthesis and Casting of Ceramics

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  • A method for burning, synthesizing, and casting y3al5o12 ceramics

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0018] Specific implementation mode 1: a kind of Y in this implementation mode 3 al 5 o 12 The method for the combustion synthesis melting and casting of ceramics is carried out in the following steps:

[0019] 1. Put the nitrate in a drying oven to dry separately to obtain a nitrate reactant;

[0020] Two, the metal powder is placed in a vacuum drying oven for drying treatment to obtain a metal powder reactant; wherein the metal powder reactant is a mixture of Al and Ti, and the molar ratio of Al and Ti is 5:3;

[0021] 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 Y 2 o 3 Composition, and Al in the system after reaction 2 o 3 and Y 2 o 3 The molar ratio is 5:3;

[0022] 4. Mix the nitrate reactant obtained in step 1, the metal powder reactant obtained in step 2, and the diluent obtained in step 3 by ball milling, then put them into the reaction device, ignite the raw materials, and carry out the ...

specific Embodiment approach 2

[0028] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the nitrate reactant described in step one is Y(NO 3 ) 3 and Al(NO 3 ) 3 one or a mixture of the two. Other steps and parameters are the same as those in Embodiment 1.

[0029] When the nitrate reactant in the present embodiment is a mixture, both are mixed in an arbitrary ratio.

specific Embodiment approach 3

[0030] Embodiment 3: This embodiment differs from Embodiment 1 to Embodiment 2 in that the drying treatment described in step 1 is achieved by drying at a temperature of 70-90° C. for 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 relates to a method for casting Y3Al5O12 ceramics by combustion synthesis. The invention aims to solve the technical problems of high tendency to generating impurity phases, difficulty in forming large-size materials, and long sintering period in the existing preparation process of Y3Al5O12 ceramics. According to the method provided by the invention, Al, Ti and nitrate are used as reactants, and Al2O3 and Y2O3 are used as diluters; after the raw materials are ignited the Al, Ti and nitrate are combusted to release heat in the reaction process; the Ti added as the raw material can neutralize nitrogen gas in the reaction process and reduce bubbles in the product, so the reaction is carried out under ordinary pressure or very low pressure, and thus, the reaction is very safe due to the low reaction pressure; and the invention has the advantages of quick experiment process, short reaction time (less than 10 minutes), short preparation period and high product purity, and can be used in the field of preparation of Y3Al5O12 ceramics.

Description

technical field [0001] The present invention relates to a Y 3 al 5 o 12 Combustion synthesis melting casting method of ceramics. Background technique [0002] Y 3 al 5 o 12 The preparation process mainly includes the following steps: powder making, molding and sintering. [0003] Usually synthetic Y 3 al 5 o 12 There are mainly two methods for powders: solid phase method and wet chemical method. The traditional solid-phase method is to use high-purity Al 2 o 3 , Y 2 o 3 Equal oxide powder, press Y 3 al 5 o 12 The stoichiometric ratio of the ingredients is mixed and ground, and then ground to a certain particle size after calcination. Since this method requires Al 2 o 3 and Y 2 o 3 The powder diffuses at high temperature and undergoes a solid-state reaction to generate Y 3 al 5 o 12 , which requires good mixing uniformity of raw materials, which is conducive to the diffusion process. The nano-powder has good diffusivity and sintering activity, so the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/44C04B35/622C04B35/484
Inventor 郑永挺杨攀赫晓东
Owner HARBIN INST OF TECH