Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Horizontal preparation method for large-size magnesium aluminate spinel-yttrium aluminium garnet eutectic ceramic through horizontal directional zone melting crystallization

A technology of magnesia-aluminum spinel and yttrium-aluminum garnet, which is applied in the growth field of eutectic ceramics preparation, can solve the problem of limited laser spot diameter, ceramic rod diameter or plate thickness, which is not suitable for the preparation volume of the laser zone melting method. Larger samples and other problems, achieve obvious economic and social benefits, outstanding mechanical properties at room temperature and high temperature, and less defects

Inactive Publication Date: 2015-09-16
HARBIN INST OF TECH
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the Brigdman method can prepare large-volume ceramic products, it is difficult to obtain engineering applications due to the coarse microstructure and low mechanical properties of the ceramics; the laser zone melting method is limited by the diameter of the laser spot and is not suitable for preparing large-volume samples.
The micro-drawing method is currently only suitable for the preparation of high-performance submicron phase structure ceramic fibers due to the volume limitation of the high-temperature directional solidification furnace; for the laser suspension zone melting method, due to the high absorption coefficient of the ceramic melt for laser radiation and the inherent low heat of the ceramic conductivity, resulting in a small diameter or plate thickness of the prepared ceramic rod (only a few millimeters)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Horizontal preparation method for large-size magnesium aluminate spinel-yttrium aluminium garnet eutectic ceramic through horizontal directional zone melting crystallization

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0020] Embodiment 1: A method for preparing a large-size magnesia-aluminum spinel-yttrium-aluminum-garnet eutectic ceramics by horizontally oriented zone melting and crystallization according to this embodiment, the method includes the following steps:

[0021] 1. Weigh 55mol% Al according to the molar percentage 2 o 3 , 25mol% MgO and 20mol% Y 2 o 3 ;

[0022] 2. The Al taken in step 1 2 o 3 , MgO and Y 2 o 3 After being uniformly mixed by anhydrous ethanol wet ball milling, drying to remove anhydrous ethanol, then putting it into a cylindrical plastic mold, performing cold isostatic pressing with a hydraulic press, and pressing it into a rod, and then placing the rod in an air atmosphere at 1500 ° C Sintering under the condition of 5h, get rod raw material;

[0023] 3. Chemical material: place the rod body raw material obtained in step 2 in a boat-shaped crucible made of molybdenum with YAG seed crystals after washing with absolute ethanol, put the boat-shaped crucib...

specific Embodiment approach 2

[0027] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the relationship between the amount of raw material added to the rod body and the width and length of the molybdenum boat-shaped crucible is calculated according to the following formula: M=l*h*d*ρ; Among them, l is the length of the boat-shaped crucible made of molybdenum, h is the width of the boat-shaped crucible made of molybdenum, d is the height of the boat-shaped crucible made of molybdenum, and ρ is the density of the eutectic. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that the molybdenum boat-shaped crucible is filled with rod raw materials, and placed horizontally on a molybdenum tray, which is placed horizontally on a On the four molybdenum round rods, the lifting ends of the four molybdenum round rods pass through the superalloy, and are positioned and reinforced with the superalloy through small holes, and the other ends of the four pulling rods are positioned and reinforced with molybdenum sheets with notches. Others are the same as in the first embodiment.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a horizontal preparation method for a large-size magnesium aluminate spinel-yttrium aluminium garnet eutectic ceramic through horizontal directional zone melting crystallization. The horizontal preparation method has the technological characteristic that the magnesium aluminate spinel-yttrium aluminium garnet eutectic ceramic grows through horizontal zone melting crystallization under vacuum conditions. The concrete growth process comprises the following four procedures: material melting; seeding; eutectic growth; and cooling and annealing. The method provided by the invention integrates the advantages of a directional crystallization process and a vertical zone melting process for crystal growth and enables the prepared magnesium aluminate spinel-yttrium aluminium garnet eutectic ceramic to have the advantages of a great size, a few defects, great hardness, outstanding mechanical properties at normal temperature and high temperature, good thermal stability, workability, etc.

Description

technical field [0001] The invention relates to a growth method for the preparation of eutectic ceramics, in particular to a method for preparing a large-size plate-shaped magnesium aluminum spinel-yttrium aluminum garnet eutectic by horizontally oriented zone melting and crystallization. Background technique [0002] Yttrium aluminum garnet (YAG) and magnesium aluminum spinel are the two most creep-resistant composite oxides with a cubic crystal structure. Composites of the spinel-yttrium aluminum garnet system may hold promise for use in oxidizing atmospheres at very high temperatures (>1650 °C). Magnesium aluminum spinel-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 ) compare...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C30B13/00C30B29/28C30B13/14
Inventor 刘洋张明福赵业权聂颖
Owner HARBIN INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com