Preparation method of high-temperature spherical molybdenum alloy powder

A spherical powder, molybdenum alloy technology, applied in the field of powder metallurgy, can solve the problems of excessive hollow powder, large powder particle size, difficult to form high-quality molybdenum alloy parts, etc. Effect

Active Publication Date: 2021-05-25
AIR FORCE UNIV PLA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When applied to refractory materials such as molybdenum alloys, mechanical granulation and gas atomization methods have their own shortcomings: the powder in the mechanical granulation method is physically bonded, and metallurgical bonding has not been achieved. It is obviously difficult to form high-quality molybdenum alloy parts in medium splashing; because argon gas is used to impinge on the rotating droplets in the gas atomization process, the powder is

Method used

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  • Preparation method of high-temperature spherical molybdenum alloy powder
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  • Preparation method of high-temperature spherical molybdenum alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 585.6g of Mo powder, 8.4g of Si powder, 6.5g of B powder, 18.2g of Zr powder, and 38.2g of Ti powder in proportion. Put the mixture into the mixer for 15 hours, then put the mixture into the planetary ball mill (QM-3SP4) for 20 hours, the ratio of ball to material is 5:1, and the speed is 300r / min. A pre-alloyed powder with uniform particle size is obtained.

[0033] Put the pre-alloyed powder into Φ25×175mm 3 In the graphite mold, Φ25mm is consistent with the size required by the plasma rotary atomization equipment. In order to prevent the pre-alloyed powder from sticking to the graphite mold, graphite paper is used to isolate the powder from the mold.

[0034] After packing, put it into 10-30H hot isostatic pressing equipment for hot isostatic pressing, and adopt the second heat preservation and second pressure holding process. First heat up to 1380°C for heat preservation. At this time, the adaptive pressure is 30Mpa for 0.5 hours, and then continue to heat ...

Embodiment 2

[0037] Weigh 591g of Mo powder, 10g of Si powder, 6.9g of B powder, 21g of Zr powder, and 42.8g of Ti powder in proportion. Put the mixture into the mixer for 15 hours, then put the mixture into the planetary ball mill (QM-3SP4) for ball milling for 20 hours, the ratio of ball to material is 5:1, and the speed is 300r / min. A pre-alloyed powder with uniform particle size is obtained.

[0038] Put the pre-alloyed powder into Φ25×175mm 3 In the graphite mold, Φ25mm is consistent with the size required by the plasma rotary atomization equipment. In order to prevent the pre-alloyed powder from sticking to the graphite mold, graphite paper is used to isolate the powder from the mold.

[0039] After packing, put it into 10-30H hot isostatic pressing equipment for hot isostatic pressing, and adopt the second heat preservation and second pressure holding process. First heat up to 1395°C for heat preservation. At this time, the adaptive pressure is 35Mpa, and the time for taking it i...

Embodiment 3

[0042] Weigh 605.6g of Mo powder, 9.9g of Si powder, 7.5g of B powder, 2.2g of Zr powder, and 4.2g of Ti powder in proportion. Put the mixture into the mixer for 15 hours, then put the mixture into the planetary ball mill (QM-3SP4) for ball milling for 20 hours, the ratio of ball to material is 5:1, and the speed is 300r / min. A pre-alloyed powder with uniform particle size is obtained.

[0043] Put the pre-alloyed powder into Φ25×175mm 3 In the graphite mold, Φ25mm is consistent with the size required by the plasma rotary atomization equipment. In order to prevent the pre-alloyed powder from sticking to the graphite mold, graphite paper is used to isolate the powder from the mold.

[0044] After packing, put it into 10-30H hot isostatic pressing equipment for hot isostatic pressing, and adopt the second heat preservation and second pressure holding process. First heat up to 1400°C for heat preservation. At this time, the adaptive pressure is 38Mpa, and the time is 1 hour. Con...

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Abstract

The invention provides a preparation method of high-temperature spherical molybdenum alloy powder. The preparation method comprises the following steps: screening molybdenum, silicon, boron, zirconium and titanium powder particles without impurities on the surfaces according to the proportion of 86.9%-89.1% of Mo powder, 1.3%-1.6% of Si powder, 0.99%-1.1% of B powder, 2.8%-3.8% of Zr powder and 5.81%-6.6% of Ti powder, mixing materials in a solid-solid mixing manner, preparing pre-alloyed powder with uniform particles by utilizing mechanical ball milling or high-energy ball milling, performing hot isostatic pressing sintering on the ball-milled powder to obtain a molybdenum alloy blank, and then obtaining the spherical molybdenum alloy powder resistant to high-temperature oxidation with a plasma rotary atomization powder preparation process. The prepared molybdenum alloy powder has good toughness, crack generation can be inhibited, high-temperature oxidation resistance is achieved, and compared with a traditional powder preparation process, the molybdenum alloy powder has better fluidity and sphericity degree, thereby having wide application prospects and popularization value.

Description

technical field [0001] The invention relates to the field of powder metallurgy, and relates to a process method for preparing high-temperature molybdenum alloy spherical powder suitable for 3D printing. Background technique [0002] Molybdenum alloy is a refractory material with high melting point, high temperature strength and high hardness, and has very important application prospects in high temperature fields. However, due to its high melting point and high hardness, subsequent machining is difficult, and traditional processes can only realize simple configurations such as plates and bars, which limits the application of molybdenum alloys. [0003] 3D printing adopts the discrete + stacking method to increase the degree of freedom in manufacturing, especially for special-shaped, curved surfaces, and complex components. The input end of 3D printing is a spherical powder. At present, there are three molding processes in the preparation of spherical powders, mechanical gra...

Claims

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Application Information

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IPC IPC(8): B22F9/14B22F9/04B22F1/00B22F3/15C22C27/04
CPCB22F9/14B22F9/04C22C27/04B22F3/15B22F2009/043B22F1/065Y02E30/30
Inventor 汪诚王雷丁相玉李秋良郭振平安志斌李卓越吴静
Owner AIR FORCE UNIV PLA
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