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Yttrium oxide-tungsten gradient material, preparation method thereof and application of tungsten-yttrium oxide gradient material in manufacturing of crucible for smelting strong-corrosivity alloy

A gradient material, yttrium oxide technology, applied in crucible furnace, metal material coating process, melting spraying and other directions, can solve the problems of reducing the thermal shock resistance of components, thermal stress mismatch, reducing the thermal mechanical properties of material components, etc. Achieve the effect of improving thermal shock resistance and high temperature mechanical properties, avoiding pollution, and broad industrial application prospects

Inactive Publication Date: 2017-02-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this crucible is based on graphite and needs to be coated with a thin layer of SiC on the inner layer, so it cannot be used for melting metals or alloys sensitive to C.
In addition, the proportion of high-temperature stable oxide and refractory metal in the sub-three layers of the transition layer in the crucible is only a simple increase and decrease, and the optimal matching of the thermal stress of the target material is not achieved by optimizing the gradient distribution function of the target material. Therefore, there are still obvious interlayer interfaces between the inner layer, the transition gradient coating and the outer layer, and between the sub-tertiary layers, resulting in thermal stress mismatch phenomenon generated during preparation and use, and reducing the stability of the entire material component. Thermomechanical properties especially reduce the thermal shock resistance of the component

Method used

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  • Yttrium oxide-tungsten gradient material, preparation method thereof and application of tungsten-yttrium oxide gradient material in manufacturing of crucible for smelting strong-corrosivity alloy
  • Yttrium oxide-tungsten gradient material, preparation method thereof and application of tungsten-yttrium oxide gradient material in manufacturing of crucible for smelting strong-corrosivity alloy
  • Yttrium oxide-tungsten gradient material, preparation method thereof and application of tungsten-yttrium oxide gradient material in manufacturing of crucible for smelting strong-corrosivity alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The number of layers of the composite material is preset to n=5, and the uppermost layer of the material is Y 2 o 3 layer with a thickness of 2mm. The transition layer is 4 layers, and the thickness of each layer is 3mm. The average particle size is 1 μ m, the yttrium oxide powder of purity 98% and the average particle size are 0.2 μ m, the tungsten powder of purity 98% calculates the volume ratio of each transition layer according to the formula (1) to (3) above, transition layer is formed by The components of each layer from top to bottom are:

[0050] 91.0vol.%Y 2 o 3 -9.0vol.%W, 72.0vol.%Y 2 o 3 -28.0vol.%W,

[0051] 50.0vol.%Y 2 o 3 -50.0vol.%W, 23.3vol.%Y 2 o3 -76.7vol.%W,

[0052] According to the pre-designed gradient structure, each powder is put into the graphite mold layer by layer, cold-pressed at room temperature, and the pressure is 5MPa; after 200MPa cold isostatic pressing, it is directly sintered in a vacuum hot-pressing sintering furnace to ...

Embodiment 2

[0055] The number of layers of the composite material is preset to n=5, and the uppermost layer of the material is Y 2 o 3 layer with a thickness of 2 mm. The transition layer is 4 layers, and the thickness of each layer is 3mm. Calculate the volume ratio of the transition layer according to the formulas (1) to (3) above with the yttrium oxide powder with an average particle size of 1 μm and a purity of 98% and the tungsten powder with an average particle size of 0.2 μm and a purity of 98%. The components of the transition layer from top to bottom are:

[0056] 91.0vol.%Y 2 o 3 -9.0vol.%W, 72.0vol.%Y 2 o 3 -28.0vol.%W,

[0057] 50.0vol.%Y 2 o 3 -50.0vol.%W, 23.3vol.%Y 2 o 3 -76.7vol.%W,

[0058] Put the powder into the graphite mold layer by layer according to the pre-designed gradient structure, and cold press at room temperature with a pressure of 5 MPa. Then, directly perform hot-press sintering in a vacuum hot-press sintering furnace to obtain Y 2 o 3 -W gra...

Embodiment 3

[0061] The number of layers of the composite material is preset to n=5, and the uppermost layer of the material is Y 2 o 3 layer with a thickness of 2mm. The transition layer is 4 layers, and the thickness of each layer is 3mm. Calculate the volume ratio of the transition layer according to the formulas (1) to (3) above with the yttrium oxide powder with an average particle size of 2 μm and a purity of 99% and the tungsten powder with an average particle size of 0.5 μm and a purity of 98%. The components of the transition layer from top to bottom are:

[0062] 91.0vol.%Y 2 o 3 -9.0vol.%W, 72.0vol.%Y 2 o 3 -28.0vol.%W,

[0063] 50.0vol.%Y 2 o 3 -50.0vol.%W, 23.3vol.%Y 2 o 3 -76.7vol.%W,

[0064] According to the volume content of the pre-designed transition layer, it is put into the powder feeder of thermal spraying one by one, and the powder is sprayed layer by layer by the plasma spraying process to obtain Y 2 o 3 -W gradient material. The process parameters ar...

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Abstract

The invention relates to a yttrium oxide-tungsten gradient material, a preparation method thereof and application of the yttrium oxide-tungsten gradient material in manufacturing of a crucible for smelting strong-corrosivity alloy. The gradient material comprises yttrium oxide layers and a plurality of transition layers; the volume fractions of yttrium oxide and tungsten in the m transition layer are calculated according to FORMULA (shown in description) and FORMULA (shown in description), wherein CYm and CWm separately represents the volume fraction of the yttrium oxide and the volume fraction of the tungsten in the m transition layer; m is a natural number from 1 to (n-1); l represents the total thickness of the plurality of transition layers; n represents the total quantity of the yttrium oxide layers and all the transition layers and is larger than or equal to 3; Hi represents the thickness of the i layer; and Hm represents the thickness of the m layer. The preparation method comprises the following steps: weighing required tungsten powder and yttrium oxide powder; laying the powder to form the corresponding layers in a mold; and carrying out molding and sintering. The invention also provides the application of the gradient material in manufacturing of the crucible for smelting the strong-corrosivity alloy. The gradient material is good in alloy melt corrosion resistance, good in thermal shock resistance, good in wear resistance and is widely applicable to smelting of the strong-corrosivity alloy; and the preparation method has the advantages of being simple in process, relatively low in energy consumption, environmentally friendly and the like.

Description

technical field [0001] The invention belongs to the field of materials, in particular, the invention relates to a yttrium oxide-tungsten gradient material and its preparation method and its application in the manufacture of a crucible for smelting highly corrosive alloys [0002] technical background [0003] With the development of science, some metals and alloy materials with special properties are widely used in the automobile industry, aerospace, electrical and electronics, chemical industry, petroleum, national defense and military industry, etc. Including magnesium alloy, aluminum alloy, nickel alloy, copper alloy, uranium alloy, etc. For these alloy materials, high purity is required during use to ensure performance. Therefore, the smelting of alloys has important national value. Melting methods often use water-cooled copper crucibles or graphite crucibles to melt alloys under the protection of inert gases, but water-cooled copper crucibles will take away a lot of he...

Claims

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Application Information

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IPC IPC(8): B22F7/02B22F1/00C23C4/134C23C4/06C23C4/08C23C4/11F27B14/10
CPCB22F7/02B22F1/0003B22F2207/01C23C4/06C23C4/08C23C28/36F27B14/10
Inventor 陈磊王诗阳王玉金贾德昌周玉
Owner HARBIN INST OF TECH
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