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Method for preparing high-performance tungsten base metal parts

A high-performance, metal-based technology, applied in the field of powder metallurgy, can solve problems such as irregular shape of tungsten-rhenium alloy powder, uneven composition of alloy powder, and unsuitability for high-performance tungsten-rhenium alloy parts.

Active Publication Date: 2019-01-04
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

The main reason why it is difficult to prepare high-performance tungsten-rhenium alloy parts is that the tungsten-rhenium alloy powder prepared by high-energy ball milling has irregular shape, poor fluidity, and high content of impurity oxygen and metal impurities. , there is also the problem of uneven composition of the alloy powder, which is not suitable for the preparation of high-performance tungsten-rhenium alloy parts, nor can it be directly used for selective laser melting

Method used

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  • Method for preparing high-performance tungsten base metal parts
  • Method for preparing high-performance tungsten base metal parts

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: Preparation of high-performance pure tungsten parts

[0019] The jet milling device is used to process the raw tungsten powder twice. For the first jet mill, the pressure of the grinding chamber is set to 0.82MPa, and the frequency of the sorting wheel is 30Hz to realize the dispersion and crushing of powder. In the second jet mill, the pressure of the grinding chamber is set to 0.70MPa, and the frequency of the sorting wheel is 60Hz to make the powder surface smoother and further improve the fluidity of the powder. Both jet mills use nitrogen as the grinding medium, so that the oxygen content in the grinding chamber is ≤0.05%. Next, the modeling process is carried out. First, use the Magic Materialia software to draw a three-dimensional schematic diagram of the part, then set the processing parameters in the Build Processor modeling software, and export the model file (the various working parameters of the SLM are: scanning speed 200mm / s, scanning distan...

Embodiment 2

[0020] Embodiment 2: Preparation of high-performance W-10wt.%Re alloy parts

[0021] The design target tungsten-rhenium alloy composition is W-10wt.% Re, with high-purity ammonium metatungstate (AMT) and ammonium perrhenate (APR) as raw materials, this mixture is dissolved in deionized water (40g / L), and then The spray drying process was carried out, the feed rate was 600ml / h, the atomization pressure was 120kPa, and the drying temperature was 100°C. The precursor mixed powder was put into a tube furnace and fed with high-purity hydrogen for reduction. The reduction temperature was 1000°C, the heating rate was 5°C / min, and the reduction time was 120min to obtain the reduced precursor powder. The reduced precursor powder is alloyed and pre-sintered at 1800°C in a hydrogen atmosphere to obtain spray pyrolytic tungsten-rhenium alloy powder with low oxygen content. Using the jet-jet milling device, the raw tungsten powder and the spray pyrolysis tungsten-rhenium alloy powder are ...

Embodiment 3

[0022] Embodiment 3: Preparation of high-performance W-15wt.%Re alloy parts

[0023]The design target tungsten-rhenium alloy composition is W-15wt.% Re, with high-purity ammonium metatungstate (AMT) and ammonium perrhenate (APR) as raw materials, this mixture is dissolved in deionized water (60g / L), and then The spray drying process was carried out, the feed rate was 600ml / h, the atomization pressure was 100kPa, and the drying temperature was 90°C. The precursor mixed powder was put into a tube furnace and fed with high-purity hydrogen for reduction. The reduction temperature was 800 °C, the heating rate was 5 °C / min, and the reduction time was 120 min to obtain the reduced precursor powder. The reduced precursor powder is alloyed and pre-sintered at 1600°C in a hydrogen atmosphere to obtain spray pyrolytic tungsten-rhenium alloy powder with low oxygen content. Using the jet-jet milling device, the raw tungsten powder and the spray pyrolysis tungsten-rhenium alloy powder are ...

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Abstract

The invention discloses a method for preparing high-performance tungsten base metal parts, and belongs to the technical field of powder added material production. Firstly, a spray pyrolysis method anda hydrogen reduction presintering method are adopted to prepare tungsten rhenium alloy powder with high purity and uniform chemical components. Then, an airflow milling technology is adopted twice toimprove the states of raw materials of tungsten powder and tungsten rhenium alloy powder; and then, the reduction is performed in a hydrogen atmosphere to finally obtain high-quality similarly spherical tungsten rhenium alloy powder. Meanwhile, a workpiece sketch map with a complicated shape and optimal machining policies are designed through computer modeling software; and printing files are derived to realize modeling. Finally, after the tungsten powder and the tungsten rhenium alloy powder are mixed in proportion, tungsten rhenium base alloy parts with final complicated shapes are preparedby SLM selective laser melting equipment. Through combination of the spray pyrolysis process with the airflow milling process, the raw material powder is prominently optimized; and the tungsten rhenium alloy parts prepared by selective laser melting are near total compact, uniform in structure and excellent in comprehensive mechanical performance.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and particularly provides a method for preparing high-performance tungsten-based metal parts. Background technique [0002] Due to its high melting point, good thermal conductivity, small thermal expansion and excellent radiation resistance, tungsten-rhenium alloy exhibits good thermophysical and mechanical properties at high temperatures, and is an irreplaceable key material in high-temperature applications such as national defense, nuclear or aerospace. . The manufacture of tungsten-rhenium alloy generally adopts the traditional powder metallurgy process, that is, "preparation of alloy powder - cold isostatic pressing - medium frequency induction sintering - deformation treatment". However, the high melting point of tungsten-rhenium alloy leads to high sintering temperature of the powder, difficulty in densification, and residual pores reduce the mechanical properties of the material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F9/30B22F9/04B22F9/22B33Y10/00B33Y70/00
CPCB22F9/04B22F9/22B22F9/30B33Y10/00B33Y70/00B22F2009/044B22F10/00B22F10/37B22F10/34B22F10/28B22F10/36B22F10/366B22F10/362B22F10/32Y02P10/25
Inventor 章林李星宇曲选辉张百成秦明礼王道宽王光华龙莹李晓东
Owner UNIV OF SCI & TECH BEIJING
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