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Yttrium oxide-tungsten gradient material, preparation method thereof and application of material to manufacture of alloy smelting crucible

A gradient material, yttrium oxide technology, applied in the crucible furnace, metal material coating process, fusion spraying, etc., can solve the problems of thermal stress mismatch, reduce the thermal mechanical properties of material components, reduce the thermal shock resistance of components, etc. Achieve excellent corrosion resistance, broad industrial application prospects, improve thermal shock resistance and high temperature mechanical properties

Inactive Publication Date: 2017-01-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 material to manufacture of alloy smelting crucible
  • Yttrium oxide-tungsten gradient material, preparation method thereof and application of material to manufacture of alloy smelting crucible
  • Yttrium oxide-tungsten gradient material, preparation method thereof and application of material to manufacture of alloy smelting crucible

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 2mm. Calculate the volume ratio of each transition layer according to the above formulas (1) to (3) according to 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 each layer from top to bottom are:

[0050] 81.8vol.%Y 2 o 3 -18.2vol.%W, 49.4vol.%Y 2 o 3 -50.6vol.%W,

[0051] 23vol.%Y 2 o 3 -50.0vol.%W, 4.4vol.%Y 2 o 3 -95.6vol.%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 obt...

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 2mm. The transition layer is 4 layers, and the thickness of each layer is 2mm. 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] 81.8vol.%Y 2 o 3 -18.2vol.%W, 49.4vol.%Y 2 o 3 -50.6vol.%W,

[0057] 23vol.%Y 2 o 3 -50.0vol.%W, 4.4vol.%Y 2 o 3 -95.6vol.%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 gradie...

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 2 mm. The transition layer is 4 layers, and the thickness of each layer is 2mm. 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] 81.8vol.%Y 2 o 3 -18.2vol.%W, 49.4vol.%Y 2 o 3 -50.6vol.%W,

[0063] 23vol.%Y 2 o 3 -50.0vol.%W, 4.4vol.%Y 2 o 3 -95.6vol.%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 are...

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Abstract

The invention relates to an yttrium oxide-tungsten gradient material, a preparation method thereof and an application of the material to manufacture of an alloy smelting crucible. The gradient material comprises an yttrium oxide layer and a plurality of transition layers, volume fractions of yttrium oxide and tungsten of the m transition layer are calculated according to the formula shown in the specification, CYm and CWm are volume fractions of the yttrium oxide and the tungsten of the m transition layer respectively, m is a natural number from 1 to (n-1), l refers to the overall thickness of the transition layers, n refers to the overall layer number of the yttrium oxide layer and the transition layers and is larger than or equal to 3, Hi refers to the thickness of the i layer, and Hm refers to the thickness of the m transition layer. The method includes the steps: weighing tungsten powder and yttrium oxide powder; laying corresponding layers with powder and forming and sintering the layers. The gradient material has high thermal conductivity and density, low thermal expansion coefficient and excellent corrosion resistance and thermal impact resistance, and can be widely used for high-temperature alloy smelting. The method is simple in process, easy to operate, low in energy consumption and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of materials. Specifically, the invention relates to a yttrium oxide-tungsten gradient material, a preparation method thereof, and an application in manufacturing a crucible for alloy melting. [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. Due to the advantages of high temperature resistance, good thermal shock resistance, easy processing and low price, graphite material has become an important and commonly used crucible and mold material in metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/02B22F1/00C23C4/134C23C4/06C23C4/08C23C4/11F27B14/10
CPCB22F7/02B22F1/0003B22F2007/042B22F2207/01C23C4/06C23C4/08F27B14/10
Inventor 王诗阳王玉金陈磊贾德昌周玉
Owner HARBIN INST OF TECH
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