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Method for combustion-synthesis casting of Al2O3/ZrO2 eutectic ceramic

A technology of combustion synthesis and eutectic ceramics, which is applied in the field of combustion synthesis and casting of Al2O3/ZrO2 eutectic ceramics, which can solve the problems of small size of eutectic ceramics, less eutectic structure of ceramics, and poor performance of ceramics, and achieve controllable speed , ceramic performance is good, the effect of high reaction temperature

Active Publication Date: 2014-12-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention is to solve existing Al 2 o 3 / ZrO 2 The small size of eutectic ceramics, the limited size and the low temperature of the reaction process lead to the technical problems of less ceramic eutectic structure and poor ceramic performance, and an Al 2 o 3 / ZrO 2 Method of Combustion Synthesis and Casting of Eutectic Ceramics

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  • Method for combustion-synthesis casting of Al2O3/ZrO2 eutectic ceramic

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specific Embodiment approach 1

[0020] Specific embodiment one: a kind of Al of this embodiment 2 o 3 / ZrO 2 The method for the combustion synthesis melting and casting of eutectic ceramics is carried out according to the following steps:

[0021] 1. Put the nitrate in a drying oven to dry separately to obtain a nitrate reactant;

[0022] 2. 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 or Al and Ti;

[0023] 3. Dry the diluent in a vacuum drying oven to obtain the diluent;

[0024] 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 combustion exothermic reaction. The reaction time 2 o 3 / ZrO 2 Eutectic ceramics; wherein the molar ratio of the nitrate reactant obtained in step 1 described in step 4 and the metal po...

specific Embodiment approach 2

[0037] Specific embodiment two: this embodiment is different from specific embodiment one: the nitrate reactant described in step one is Zr(NO 3 ) 4 and Al(NO 3 ) 3 one or a mixture of the two. Other steps and parameters are the same as those in Embodiment 1.

[0038] When the nitrate reactant in the present embodiment is a mixture, both are mixed in an arbitrary ratio.

specific Embodiment approach 3

[0039] Embodiment 3: This embodiment differs from Embodiment 1 to Embodiment 2 in that: the drying treatment in step 1 is realized at a temperature of 50-70° 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 method for combustion-synthesis casting of Al2O3 / ZrO2 eutectic ceramic, relates to a preparation method of the eutectic ceramic and particularly relates to a method for combustion-synthesis casting of the Al2O3 / ZrO2 eutectic ceramic. The invention aims at solving the technical problems that the size of the Al2O3 / ZrO2 eutectic ceramic is small and is limited and the temperature in the reaction process is low to cause fewer eutectic structures and bad ceramic performance. The method disclosed by the invention has the advantages that a reaction agent is metal powder and nitrate, a diluting agent is Al2O3 and ZrO2, raw materials are ignited and react by heat released from burning of the metal powder and the nitrate, the reaction temperature can reach 4300K, and is high, and then the raw materials are fully mixed in a liquid phase, so that the number of the eutectic structures is large, the ceramic performance is good, the reaction time is less than 10min, the preparation period is short, the cost is low, and the product purity is high. The method can be applied in the field of preparation of the eutectic ceramic.

Description

technical field [0001] The invention relates to a preparation method of eutectic ceramics, in particular to an Al 2 o 3 / ZrO 2 Combustion synthesis fusion casting method of eutectic ceramics. Background technique [0002] Al 2 o 3 / ZrO 2 Due to its high strength, good toughness, excellent high-temperature mechanical properties, thermal stability and low crack sensitivity, eutectic ceramics can be applied to materials in high-temperature environments or high-temperature oxidative conditions. [0003] The common preparation methods of eutectic ceramics mainly include the following: Bridgman method, laser heating buoyancy zone method, micro-pulling method, fixed edge feeding film method and combustion synthesis method. [0004] The principle of the Bridgman method (crucible drop method) is to put the reactants into the crucible, and then put the crucible into the furnace equipped with induction coils. The furnace is heated above the melting point of the reactants through...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/48C04B35/622C04B35/64
Inventor 郑永挺杨攀赫晓东
Owner HARBIN INST OF TECH