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Method for preparing yttrium oxide refractory material product through gel casting and crucible

A technology of gel injection molding and refractory materials, applied in the field of refractory materials, can solve problems such as unreachable performance, complicated process, and introduction of impurities

Pending Publication Date: 2022-04-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In this method, although the entry of the second phase compound can reduce the sintering temperature to a certain extent and achieve better sintering performance, it introduces impurities and cannot achieve excellent performance.
Moreover, this method is very dependent on the shape and size of the specific mold opening, and the size cannot be variable and controllable, and the process is complicated
[0005] For pure-phase yttrium oxide, although it has excellent hot forging performance because of its extremely low inclusions, it is different from general refractory materials. Yttrium oxide is mostly used in functional ceramics, such as transparent ceramics, luminous ceramics, etc., its own It is difficult to achieve both thermal shock resistance and mechanical properties. It is generally considered that it is only suitable for the preparation of relatively small crucibles, and cannot meet the needs of melting and casting of large-sized ingots.

Method used

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  • Method for preparing yttrium oxide refractory material product through gel casting and crucible

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The yttrium oxide crucible was prepared by gel injection molding, and the specific steps were as follows:

[0026] S1: Prepare a premix solution containing organic monomers and cross-linking agents; organic monomers and cross-linking agents are prepared at a ratio of 9:1. The mass ratio of the sum of organic monomer and crosslinking agent mass to water in the premixed liquid is 20:100.

[0027] S2: set the particle size to 325 purpose Y 2 o 3 Electrofused particles, particle size is 1000 mesh Y 2 o 3 The electric fusion particles are sequentially added to the prepared pre-mixed solution according to the mass ratio of 60:40 to form a slurry, and added while stirring.

[0028] Then add grinding balls, dispersant ammonium citrate, suspending agent calcium lignosulfonate, and the amount of ammonium citrate is Y 2 o 3 1.5wt% of the total amount, the addition of calcium lignosulfonate is 3wt% of the slurry, and the quality of the grinding ball is the same as that of Y ...

Embodiment 2

[0035] The yttrium oxide crucible was prepared by gel injection molding, and the specific steps were as follows:

[0036] S1: Prepare a premix solution containing organic monomers and cross-linking agents; organic monomers and cross-linking agents are prepared according to 8:1. The mass ratio of the sum of organic monomer and crosslinking agent to water in the premixed liquid is 16:100.

[0037] S2: set the particle size to 325 purpose Y 2 o 3 Electrofused particles, particle size is 1000 mesh Y 2 o 3 Electrofused particles and Y with a particle size of 1 to 2 μm 2 o 3 The micron fine powder is sequentially added to the prepared pre-mixed liquid according to the mass ratio of 50:20:30 to form a slurry, and added while stirring.

[0038] Then add grinding balls, dispersant ammonium citrate, suspending agent calcium lignosulfonate, and the amount of ammonium citrate is Y 2 o 3 1.3wt% of the total amount, the calcium lignosulfonate addition is 2wt% of the slurry, the qual...

Embodiment 4

[0050] The yttrium oxide crucible was prepared by gel injection molding, and the specific steps were as follows:

[0051] S1: Prepare a premix solution containing organic monomers and cross-linking agents; organic monomers and cross-linking agents are prepared at a ratio of 10:1. The mass ratio of the sum of organic monomer and crosslinking agent mass to water in the premixed liquid is 15:100.

[0052] S2: the particle size is 60 ~ 100 mesh Y 2 o 3 Electrofused particles, particle size is 325 mesh Y 2 o 3 Electrofused particles and Y with a particle size of 1 to 2 μm 2 o 3 The micron fine powder is sequentially added to the prepared pre-mixed solution according to the mass ratio of 40:25:35 to form a slurry, and added while stirring.

[0053] Among them, the Y of 1~2μm 2 o 3 The micron powder is pretreated before use to improve the dispersibility of the powder in the water-based dispersion system: phosphoric acid (H 3 PO 4 ) as a modifier to modify 1-2 μm micron powd...

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Abstract

The invention belongs to the technical field of refractory materials, and particularly relates to a method for preparing an yttrium oxide refractory material product through gel casting and a crucible. Aiming at the problem that pure-phase yttrium oxide is only suitable for preparing a crucible with a relatively small size and cannot meet the smelting and casting requirements of a large-size cast ingot, the invention provides the method for preparing the yttrium oxide refractory material product, which is simple in preparation process, controllable in size and excellent in performance, and four kinds of Y2O3 particles or micron fine powder with different sizes are adopted; y2O3 with different sizes is added according to a reasonable sequence and proportion, and the obtained product has good mechanical properties and thermal shock resistance at the same time. Meanwhile, by combining the reasonable selection of the dispersing agent and the suspending agent and the precise system of glue discharging and sintering, the finally obtained product, especially the yttrium oxide crucible, has excellent comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a method for preparing yttrium oxide refractory products by gel injection molding and a crucible. Background technique [0002] Small cold isostatic pressing modified yttrium oxide crucible (Tetsui T, Kobayashi T, Kishimoto A, et al. Structural optimization of an yttria crucible for melting TiAl alloy [J].Intermetallics,2012,20(1):16–23) has Have a certain engineering experiment basis. Since yttrium oxide is the most thermodynamically stable oxide, it has been shown that crucibles made of yttrium oxide are more suitable than crucibles made of alumina, zirconia, or calcium oxide when preparing alloys that are sensitive to contamination, such as TiAl alloys. The crucible can greatly reduce the pollution of the ingot. [0003] In 2017, the Institute of Metal Research, Chinese Academy of Sciences (patent application number 201710600385.9) proposed a method ...

Claims

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Application Information

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IPC IPC(8): C04B35/505C04B35/66C04B35/622F27B14/10
CPCC04B35/505C04B35/66C04B35/622F27B14/10C04B2235/5427C04B2235/5436C04B2235/6581C04B2235/6023F27B2014/102
Inventor 孙旭东任培王昭东张牧刘威
Owner NORTHEASTERN UNIV
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