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Method for preparing YAM ceramic through loose sintering technology

A technology of ceramics and craftsmanship, which is applied in the field of ternary oxide ceramics and its molding preparation, can solve the problems of poor density and achieve the effect of improving density

Active Publication Date: 2015-05-27
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, single-phase YAM bulk ceramics have been prepared by hot pressing, but the size and shape of materials prepared by hot pressing have certain limitations. For example, materials with large sizes or complex shapes are difficult to obtain by hot pressing. , and poor density

Method used

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  • Method for preparing YAM ceramic through loose sintering technology
  • Method for preparing YAM ceramic through loose sintering technology
  • Method for preparing YAM ceramic through loose sintering technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Will Y 4 Al 2 o 9 (YAM) ceramic powder filled with Al 2 o 3 Carry out refinement treatment in the quick ball mill tank, use deionized water as medium, quick ball mill for 5 minutes, then take out and dry. Will Y 4 Al 2 o 9 The powder and polyvinyl alcohol (PVA) are mixed evenly at a mass ratio of 100:0.5 and then loaded into a stainless steel mold. The shape of the mold is cylindrical, and then preformed with a pressure of 1MPa, and the pressure is maintained at 1MPa for 2 minutes and then released. will preform the Y 4 Al 2 o 9 (YAM) ceramics are loaded into rubber molds and processed by cold isostatic pressing with a pressure of 50MPa. Finally, the cold isostatic pressed Y 4 Al 2 o 9 (YAM) ceramics were loaded into a BN-coated graphite mold, and sintered at a rate of 2 °C / min to 1500 °C for 1 hour in a sintering furnace with a protective atmosphere of inert gas (argon with a purity ≥99.99%).

[0038] Using the above process to finally obtain a Y with a d...

Embodiment 2

[0040] Will Y 4 Al 2 o 9 (YAM) ceramic powder using Al 2 o 3 The rapid ball milling jar is subjected to refinement treatment, using deionized water as the medium, rapid ball milling for 30 minutes, and then taken out and dried. Will Y 4 Al 2 o 9 The powder and polyvinyl alcohol (PVA) are mixed evenly at a mass ratio of 100:2 and then loaded into a stainless steel mold. The shape of the mold is cube-shaped, and then preformed with a pressure of 5MPa, and the pressure is released at 5MPa for 5 minutes. will preform the Y 4 Al 2 o 9 (YAM) ceramics are loaded into rubber molds and processed by cold isostatic pressing with a pressure of 150MPa. Finally, the cold isostatic pressed Y 4 Al 2 o 9 (YAM) ceramics were loaded into a BN-coated graphite mold, and sintered at a rate of 10 °C / min to 1700 °C for 2 hours in a sintering furnace with a protective atmosphere of inert gas (argon with a purity ≥99.99%).

[0041] Using the above process to finally obtain a Y with a dens...

Embodiment 3

[0043] Will Y 4 Al 2 o 9 (YAM) ceramic powder filled with Al 2 o 3 Carry out refinement treatment in the quick ball mill tank, use deionized water as medium, quick ball mill for 60 minutes, then take out and dry. Will Y 4 Al 2 o 9 The powder and polyvinyl alcohol (PVA) are mixed evenly at a mass ratio of 100:4 and then loaded into a stainless steel mold. The shape of the mold is cylindrical, and then preformed with a pressure of 8MPa, and the pressure is released after 10 minutes of pressure. will preform the Y 4 Al 2 o 9 (YAM) ceramics are loaded into rubber molds and processed by cold isostatic pressing with a pressure of 250MPa. Finally, the cold isostatic pressed Y 4 Al 2 o 9 (YAM) ceramics were loaded into a graphite mold coated with BN, and sintered at a rate of 15 °C / min to 1800 °C for 2 hours in a sintering furnace with an inert gas (xenon) protective atmosphere.

[0044] Using the above process to finally obtain a Y with a density of 100% 4 Al 2 o 9 (...

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Abstract

The invention relates to a method for preparing a YAM ceramic through a loose sintering technology. The method comprises the following steps: 1, uniformly mixing Y4Al2O9 ceramic powder with polyvinyl alcohol (PVA) to obtain a mixture, and filling the mixture into a die for premolding; 2, carrying out cold isostatic pressing treatment of the premolded Y4Al2O9 ceramic; and 3, heating the Y4Al2O9 ceramic subjected to the cold isostatic pressing treatment in a sintering furnace having inert gas protection atmosphere to 1500-2000DEG C at a heating rate of 2-20DEG C / min, and sintering for 1-3h to obtain bulky YAM ceramic. The preparation method substantially improves the density of the ceramic material, realizes the controllability of the density of the YAM ceramic material, and allows the YAM ceramic material having a large dimension and a complicate shape to be prepared in order to satisfy special requirements of the space flight and aviation field.

Description

technical field [0001] The invention relates to ternary oxide ceramics and a molding preparation method thereof, in particular to a method for preparing YAM ceramics by a pressureless sintering process. Background technique [0002] The rapid development of aviation and aerospace technology has put forward higher and higher requirements for the performance of materials, especially the rapid development of hypersonic vehicles and advanced propulsion systems - scramjet engines have brought new challenges to materials and structures. They require materials that can withstand the extreme heat, force, and corrosive environment faced by hypersonic flight. Therefore, integrated anti-heat insulation materials are key materials for anti-insulation components and heat-sealing components of hypersonic near-space vehicles, and materials with high temperature resistance and low thermal conductivity R&D is playing an increasingly important role. [0003] Y-Al-O system ceramics have the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/505C04B35/64C04B35/634
Inventor 卢新坡周延春
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH