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Method for preparing yttrium oxide coating of corundum crucible

A corundum crucible and yttrium oxide technology, which is applied in the field of preparing corundum crucible yttrium oxide coating, can solve the problems of restricting the application of titanium-aluminum alloy and reducing the performance of the alloy, and achieve the effect of ensuring purity and performance, low cost, and broad application prospects

Inactive Publication Date: 2014-05-07
NANJING UNIV OF SCI & TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is reported that Beijing University of Science and Technology (Patent No.: CN101984321A) prepared yttrium oxide mold inside the corundum crucible, which has been applied to the directional solidification of titanium-aluminum alloy. performance, which limits the further application of titanium-aluminum alloy

Method used

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  • Method for preparing yttrium oxide coating of corundum crucible

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step 1: Preparation of Slurry

[0018] Mix analytically pure yttrium oxide, polyethylene glycol, and distilled water at a mass ratio of 3:1:1, and stir until there are no bubbles.

[0019] Step 2: Preparation of Coating

[0020] Apply the slurry described in the first step evenly on the inner wall of the corundum tube cleaned by ultrasonic waves, let it dry naturally for 2 hours, and then bake it in an oven at 50°C for 12 hours.

[0021] Step 3: Sintering of the coating

[0022] Put the coated corundum tube described in the second step into a muffle furnace for sintering at a low temperature of 600°C for 12 hours, then cool with the furnace; sinter and bake at a high temperature of 1500°C for 12 hours, and then Furnace cools.

Embodiment 2

[0024] Step 1: Preparation of Slurry

[0025] Mix analytically pure yttrium oxide, polyethylene glycol, and distilled water at a mass ratio of 3:1:1, and stir until there are no bubbles.

[0026] Step 2: Preparation of Coating

[0027] Apply the slurry described in the first step evenly on the inner wall of the corundum tube cleaned by ultrasonic waves, let it dry naturally for 2 hours, and then bake it in an oven at 80°C for 6 hours.

[0028] Step 3: Sintering of the coating

[0029] Put the coated corundum tube described in the second step into a muffle furnace for sintering at a low temperature of 800°C for 6 hours, then cool with the furnace; sinter and bake at a high temperature of 1600°C for 6 hours, and then Furnace cools.

Embodiment 3

[0031] Step 1: Preparation of Slurry

[0032] Mix analytically pure yttrium oxide, polyethylene glycol, and distilled water at a mass ratio of 3:1:1, and stir until there are no bubbles.

[0033] Step 2: Preparation of Coating

[0034] Apply the slurry described in the first step evenly on the inner wall of the corundum tube cleaned by ultrasonic waves, let it dry naturally for 2 hours, and then bake it in an oven at 65°C for 9 hours.

[0035] Step 3: Sintering of the coating

[0036] Put the coated corundum tube described in the second step into a muffle furnace for sintering at a low temperature of 750°C for 9 hours, then cool with the furnace; sinter and bake at a high temperature of 1550°C for 9 hours, and then Furnace cools.

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Abstract

The invention discloses a method for preparing an yttrium oxide coating of a corundum crucible. The method comprises steps of mixing yttrium oxide powder, polyethylene glycol and distilled water according to a mass ratio of 3:1:1, stirring to form uniform sizing agent without bubbles, uniformly coating the sizing agent on the inner wall of a corundum tube cleaned up by ultrasonic and dried, naturally drying for 2 hours, then putting the corundum tube into an oven and baking for 6-12 hours at 50-70 DEG C, putting the corundum tube into a muffle furnace and sintering at low temperature of 600-800 DEG C for 6-12 hours, cooling along with the furnace, then sintering and baking at high temperature of 1500-1600 DEG C for 6-12 hours, and cooling along with the furnace. The method is simple, has low cost, is used for directional freezing of alloy containing active elements, can prevent the alloy from reacting with the crucible, and guarantees the purity and property of the alloy; the corundum tube with yttrium oxide coating reaches up to the temperature of 1600 DEG C after long-term use, thus having wide application prospect in casting, remelting and directional freezing of high-melting-point high-activity alloy.

Description

technical field [0001] The invention discloses a method for preparing a corundum crucible yttrium oxide coating, which belongs to the field of material preparation. Background technique [0002] The rapid development of the aviation industry has forced the continuous increase of the inlet temperature of the engine turbine, and it is urgent to select turbine blades with higher temperature-bearing capacity and lower specific gravity to meet the increasing requirements of the thrust-to-weight ratio of the engine. After nearly 30 years of development, nickel-based superalloys and titanium-aluminum alloys have been successfully applied to aircraft engine turbine blades, effectively improving the thrust-to-weight ratio of the engine. In order to further improve the performance of the engine, effectively solving the pollution of the alloy in the process of master alloy smelting and material forming is the guarantee for obtaining high-performance materials. Especially for direction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 陈光周雪峰陈锋彭英博李沛
Owner NANJING UNIV OF SCI & TECH