Method for preparing magnesia-stabilized zirconia crucible through casting molding

A technology for stabilizing zirconia and grouting, which is used in the field of superalloy or special precious metal smelting and refractory materials, which can solve the problems of sintering and cracking of zirconia crucibles, and achieve low cost, high strength and refractoriness, good thermal stability and performance. The effect of erosion resistance

Inactive Publication Date: 2015-08-26
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the object of the present invention is to provide a method for preparing a magnesia-stabilized zirconia crucible by slip casting to solve the problem of sintering and cracking of the zirconia crucible

Method used

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  • Method for preparing magnesia-stabilized zirconia crucible through casting molding
  • Method for preparing magnesia-stabilized zirconia crucible through casting molding

Examples

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Embodiment 1

[0016] Commercial magnesia stabilized zirconia powder (MgO3.5%, ZrO 2 96.5%), deionized water, binder and dispersant citric acid are mixed in the ball mill tank according to the ratio of 100:22:14:3 (mass ratio), and zirconia balls are added to the ball mill tank, and the slurry and zirconia The ratio of the balls is 1:1, and then placed in the drum to mix the slurry for 10 hours, configured to form a slurry with good fluidity, passed through a 120-mesh sieve, removed large particles in the slurry, and vacuum degassed the slurry for 5 minutes . Pour the slurry into the gypsum mold. The grouting time is 5 minutes and the slurry is continuously replenished. At this time, the wall thickness of the crucible is 3mm, and the remaining slurry is poured out. The gypsum mold is placed obliquely in the air, demoulded after 1 hour, poured out the green body, placed in a dry and shaded place for 2-3 days, and finally repaired the green body. Place the formed dry biscuit sample in a high...

Embodiment 2

[0019] Commercial magnesia stabilized zirconia powder (MgO3.5%, ZrO 2 96.5%), deionized water, binder and dispersant triethanolamine are mixed in the ball mill tank according to the ratio of 100:20:13:1 (mass ratio), and zirconia balls are added to the ball mill tank, and the slurry and zirconia The ratio of the balls is 1:1, and then placed in the drum to mix the slurry for 10 hours, configured into a slurry with good fluidity, passed through a 120-mesh sieve, removed large particles in the slurry, and vacuum degassed the slurry for 5 minutes . Pour the slurry into the gypsum mold. The grouting time is 7 minutes and the slurry is continuously replenished. At this time, the wall thickness of the crucible is 3mm, and the remaining slurry is poured out. The gypsum mold is placed obliquely in the air, demoulded after 1 hour, poured out the green body, placed in a dry and shaded place for 2-3 days, and finally repaired the green body. Place the formed dry bisque sample in a high...

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Abstract

The invention discloses a method for preparing a magnesia-stabilized zirconia crucible through casting molding, and relates to the technical field of refractory materials. The preparation method comprises the steps that: in commercial magnesia-stabilized zirconia powder (MgO 3.5%, ZrO2 96.5%), a binding agent, deionized water and a dispersing agent with a certain ratio are added, such that a slurry with good fluidity is obtained, wherein a weight ratio of the above materials is 100:(5-15):(15-30):(0.5-5). Mixing is carried out in a drum, such that a slurry is obtained; the slurry is added into a plaster mold; the plaster mold is placed in air with an inclined position; demolding is carried out after 0.5-1.5h, and a blank is fetched; a final firing temperature is 1600-1700 DEG C, and the temperature is maintained for 3-10h; and a cooling speed is controlled, such that the magnesia-stabilized zirconia crucible is obtained. The method has the advantages of simple process equipment and uniform crucible wall thickness. The prepared magnesia-stabilized zirconia crucible has relatively high strength, relatively high refractoriness, high density, good thermal stability, good erosion resistance, and cracking resistance during a sintering process.

Description

technical field [0001] The invention relates to the preparation and sintering of a magnesia-stabilized zirconia crucible, and belongs to the technical field of high-temperature alloy or special precious metal smelting and refractory materials. Background technique [0002] Superalloys are mainly used in hot-end parts of aero-engines and gas turbines, such as working blades, turbine disks, combustion chambers, etc. of aero-engines, so they are an important guarantee for the development of aero-engines and gas turbines. With the development of high-temperature alloys so far, there is no potential for major adjustments in the main components to be tapped. Therefore, the content of impurity elements (such as O, N, and S) is controlled to eliminate or reduce their harmful effects, and to produce pure or ultra-pure high-quality alloys. It is of great significance to meet the requirements of strengthening and toughening superalloys. Impurity elements O, N, S can be transformed int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/48C04B35/622
Inventor 郭曙强姜兰卞玉洋张满刘银河陈松丁伟中
Owner SHANGHAI UNIV
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