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Flow guide pipe for alloy powder, and preparation method thereof

A technology of alloy powder and guide tube, which is applied in the field of refractory materials, can solve the problems of low density, poor resistance to oxidation and desolvation, diameter expansion, etc., achieve excellent thermal shock resistance and solve the effect of poor thermal shock resistance

Inactive Publication Date: 2021-03-02
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diversion tube made of foreign zirconia is acceptable in use, but due to its low density (apparent porosity 14%, volume density 4.8g cm -3 ) and poor resistance to oxidation and desolvation lead to serious diameter expansion in use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: A draft tube for preparing alloy powder by gas atomization, including the following mass components: m-ZrO 2 91%, CaO1.5%, MgO1.5%, Y 2 o 3 1.5%, Nb 2 o 3 1.5%, CeO 2 1.5%, Sc 2 o 3 1.5%. The purity of the above raw materials is ≥99%, and the particle size is 325 mesh.

[0017] The preparation of the draft tube for preparing the alloy powder by gas atomization comprises the following steps:

[0018] 1) Weigh the raw materials in proportion, and mix them evenly in the double-cone mixer;

[0019] 2) Pour the evenly mixed raw materials into the arc and melt at high temperature;

[0020] 3) Decarbonize the molten liquid by blowing the ball with high-pressure gas to obtain zirconia balls;

[0021] 4) Break the zirconia balls to 1000 mesh.

[0022] 5) Pour the crushed material into the granulator, add 6% PVA (concentration 5%), stir and granulate for 20 minutes, and pass through a 15-mesh sieve.

[0023] 6) Pour the pelletized material into the mould, a...

Embodiment 2

[0026] Example 2: A draft tube for preparing alloy powder by gas atomization, comprising the following components: m-ZrO 2 88%, CaO2.0%, MgO2.0%, Y 2 o 3 2.0%, Nb 2 o 3 2.0%, CeO 2 2.0%, Sc 2 o 3 2.0%. The purity of the above raw materials is ≥99%, and the particle size is 350 mesh.

[0027] The preparation method of the draft tube for preparing the alloy powder by gas atomization comprises the following steps:

[0028] 1) Weigh the raw materials in proportion, and mix them evenly in the double-cone mixer;

[0029] 2) Pour the evenly mixed raw materials into the arc and melt at high temperature;

[0030] 3) Decarbonize the molten liquid by blowing the ball with high-pressure gas to obtain zirconia balls;

[0031] 4) Break the zirconia balls to 1500 mesh.

[0032] 5) Pour the crushed material into the granulator, add 7% PVA (concentration 5%), stir and granulate for 20 minutes, and pass through a 15-mesh sieve.

[0033] 6) Pour the pelletized material into the mould...

Embodiment 3

[0036] Example 3: A draft tube for preparing alloy powder by gas atomization, comprising the following components: m-ZrO 2 85%, CaO2.5%, MgO2.5%, Y 2 o 3 2.5%, Nb 2 o 3 2.5%, CeO 2 2.5%, Sc 2 o 3 2.5%. The purity of the above raw materials is 99%, and the particle size is 500 mesh.

[0037] The preparation method of the draft tube for preparing the alloy powder by gas atomization comprises the following steps:

[0038] 1) Weigh the raw materials in proportion, and mix them evenly in the double-cone mixer;

[0039] 2) Pour the evenly mixed raw materials into the arc and melt at high temperature;

[0040] 3) Decarbonize the molten liquid by blowing the ball with high-pressure gas to obtain zirconia balls;

[0041] 4) Break the zirconia balls to 1800 mesh.

[0042] 5) Pour the crushed material into the granulator, add 7.5% PVA (concentration 5%), stir and granulate for 20 minutes and pass through a 15-mesh sieve.

[0043] 6) Pour the pelletized material into the mould...

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Abstract

The invention belongs to the field of refractory materials, and particularly relates to a flow guide pipe for alloy powder, and a preparation method thereof. The flow guide pipe adopts high-purity zirconium oxide as a main raw material, and is added with six compounds of CaO, MgO, Y2O3, Nb2O3, CeO2 and Sc2O3 as stabilizers, wherein the addition amounts of the high-purity zirconium oxide and the six compounds are as follows in percentage by mass: 82-91% of the high-purity zirconium oxide, 1.5-3.0% of CaO, 1.5-3.0% of MgO, 1.5-3.0% of Y2O3, 1.5-3.0% of Nb2O3, and 1.5-3.0% of Sc2O3, melting is performed at a high temperature in an electric arc furnace after uniform mixing, and oxidizing, blowing balls to remove carbon, and crushing are performed to obtain the composite stable zirconium oxidefine powder raw material. According to the invention, the problems of poor thermal shock resistance, no erosion and scouring resistance and serious diameter expansion of the flow guide pipe in the gasatomization process are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a draft tube for alloy powder and a preparation method thereof. Background technique [0002] In recent years, industries such as metal 3D printing, metal injection molding, and high-temperature alloys have developed rapidly, and the quality requirements for alloy powders are getting higher and higher. The particle size and distribution, purity and production efficiency of alloy powder are related to the preparation technology of alloy powder. The preparation of alloy powder by gas atomization has the advantages of fine particle size, high spheroidization, high purity, low energy consumption and environmental friendliness. It has become the main direction of the development of high-performance alloy powder technology in the world in recent years. [0003] The guide tube is one of the key components of the gas atomization process. It is required that the ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/484C04B35/622C04B35/657C04B35/63
CPCC04B35/484C04B35/622C04B35/657C04B35/6303C04B2235/3208C04B2235/3206C04B2235/3229C04B2235/3251C04B2235/3225C04B2235/3224
Inventor 于建宾王来稳马渭奎钱凡刘国齐
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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