Method for preparing large-size aluminum oxide-yttrium aluminum garnet eutectic ceramic through horizontal orientation zone melting crystallization

A yttrium aluminum garnet, horizontally oriented technology is applied in the field of preparing alumina-yttrium aluminum garnet eutectic ceramics, which can solve the problems of poor eutectic quality and many growth defects, and achieves large size, large action area, room temperature and temperature. Outstanding high temperature mechanical properties

Inactive Publication Date: 2015-07-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of many growth defects and poor eutectic quality in the preparation process of existing large-volume eutectic ceram

Method used

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  • Method for preparing large-size aluminum oxide-yttrium aluminum garnet eutectic ceramic through horizontal orientation zone melting crystallization

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specific Embodiment approach 1

[0018] Specific implementation mode 1: In this implementation mode, a method for preparing large-scale alumina-yttrium aluminum garnet eutectic ceramics by melting and crystallizing in a horizontal orientation zone is carried out according to the following steps:

[0019] 1. Mixing of ceramic materials: Weigh 81.5mol% Al according to molar ratio 2 o 3 and 18.5 mol% of Y 2 o 3 , mixed to obtain the mixture, then wet ball milled with ethanol for 5h to 12h, dried, put into a cylindrical plastic mold, and pressed into a rod body of φ30mm×150mm by cold isostatic pressing with a hydraulic press, and sintered at high temperature in an air atmosphere, the sintering temperature The temperature is 1500°C, the sintering time is 5h-10h, and the rod-shaped raw material 4 is obtained;

[0020] 2. Chemical material: Wash the molybdenum boat-shaped crucible 3 to 5 times with alcohol, then vertically embed the YAG seed crystal 1 into the tip of the cleaned molybdenum boat-shaped crucible 4,...

specific Embodiment approach 2

[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the sintering time in step 1 is 8 hours. Others are the same as the first embodiment.

specific Embodiment approach 3

[0033] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the heating element 6 in step 2 is a welded tungsten heating element; the heating element 6 is a flat box type. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for preparing large-size aluminum oxide-yttrium aluminum garnet eutectic ceramic through horizontal orientation zone melting crystallization, and relates to the method for preparing the large-size aluminum oxide-yttrium aluminum garnet eutectic ceramic. The method solves the problems that the number of growth defects is large, and the eutectic quality is poor in the excising preparing process of the large-size eutectic ceramic. The method includes the steps of ceramic mixing, material melting, seeding, cooling and annealing. The method integrates the advantages of a directional crystallizing method and a vertical zone melting method for growth of crystal, the prepared aluminum oxide-yttrium aluminum garnet eutectic ceramic is made to have the advantages of being large in size, less in defect, high in hardness, remarkable in normal-temperature and high-temperature mechanical property, high in heat stability, easy to machine and the like. The method is used for preparing the large-size aluminum oxide-yttrium aluminum garnet eutectic ceramic.

Description

technical field [0001] The invention relates to a method for preparing alumina-yttrium aluminum garnet eutectic ceramics. Background technique [0002] Alumina-yttrium aluminum garnet eutectic ceramics have excellent oxidation resistance, corrosion resistance and mechanical properties at high temperatures, which fully meet people's stringent requirements for high-temperature structural materials in the advanced aerospace field. Compared with traditional single crystal superalloy (density 8.0g / cm 3 ) compared to the low density (4.1g / cm 3 ), it is estimated that the thermal efficiency can be increased by up to 9% when used in gas turbines, which has great engineering application prospects and potential economic value. Therefore, in recent years, this material has attracted widespread attention from all over the world, and it is expected to become the first choice for ultra-high temperature structural materials for long-term work in high-temperature oxidizing atmospheres abo...

Claims

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Application Information

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IPC IPC(8): C30B29/16C30B15/00C04B35/10C04B35/44
CPCC30B29/16C04B35/44C04B2235/3225C04B2235/6567C04B2235/6581C04B2235/76C30B15/00
Inventor 聂颖张明福刘洋王文均赵业权
Owner HARBIN INST OF TECH
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