US 11,919,072 B2Granted

Preparation process of multi-component spherical alloy powder

AssigneeZheng Zhou Research Institute of Mechanical Engineering

InventorsZhihui Lu, Hongtao Yang, Xudong Si, Zhiyang Sun, Leile Zhang, Guangfei You, Yiyong Wu, Chao Chen

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Abstract

The present invention discloses a preparation process of multi-component spherical alloy powder, which adopts a plasma rotation electrode process (PREP) method to prepare the multi-component spherical alloy powder. The multi-component alloy includes at least one of refractory metals and compounds thereof, specifically including tungsten, molybdenum, tantalum, niobium, rhenium, tungsten carbide, tantalum carbide and the like. The present invention adopts the PREP method to prepare the multi-component spherical alloy powder containing the refractory metals or compound thereof, and the prepared multi-component spherical alloy powder has high sphericity, good fluidity and high tap density, and is low in content of impurity elements and output of hollow powder and satellite powder; compared with other preparation methods, the prepared alloy powder has better performance and is an ideal material for metal 3D printing; and the present invention further solves the problem of difficulty in preparing a round rod with the refractory metals or compound thereof as a base material used in the PREP method, and provides a spatial structure meshing method, a direct element mixing method or a porous framework method to prepare a multi-component alloy rod.

Claims5

Dependent claims

A preparation process of multi-component spherical alloy powder, characterized by adopting a plasma rotation electrode process (PREP) method to prepare multi-component spherical alloy powder, and the multi-component alloy includes at least one of refractory metals and compounds thereof, specifically including tungsten, molybdenum, tantalum, niobium, rhenium, tungsten carbide, and tantalum carbide;

wherein the preparation method thereof is as follows:
2.1 preparing a multi-component alloy rod;
and
2.2 preparing multi-component spherical alloy powder by the PREP method with the alloy rod of step 2.1;
wherein a direct element mixing method is adopted to prepare the multi-component alloy rod in step 2.1, and the preparation method thereof is as follows:
4.1 conducting powder batching according to the element ratio of the target multi-component alloy, and then carrying out mechanical ball milling by a ball mill, adopting argon for protection in the ball milling process, and adding stearic acid as a process control agent;
4.2 under the protection of argon, putting the ball-milled powder material into a graphite mold, manually compacting the upper and lower ends with graphite pads when the powder material is put into the graphite mold, then putting the graphite mold together with the powder into a furnace cavity of a sintering furnace, and closing a furnace door for hot pressed sintering;
and
4.3 treating the surface of the cylindrical multi-component alloy rod obtained by hot pressed sintering to make the dimensional accuracy and surface quality thereof meet the requirements of the PREP method.

6 more elements

A preparation process of multi-component spherical alloy powder, characterized by adopting a PREP method to prepare multi-component spherical alloy powder, and the multi-component alloy includes at least one of refractory metals and compounds thereof, specifically including tungsten, molybdenum, tantalum, niobium, rhenium, tungsten carbide, tantalum carbide;

wherein the preparation method thereof is as follows:
2.1 preparing a multi-component alloy rod;
and
2.2 preparing multi-component spherical alloy powder by the PREP method with the alloy rod of step 2.1;
wherein a porous framework method is adopted to prepare the multi-component alloy rod in step 2.1, and the preparation method thereof is as follows:
7.1 mixing refractory metal or its compound power particles with a large particle size used as the raw material with a spherical pore-forming agent and then putting into a mixer for mixing;
7.2 putting the evenly mixed powder on a hydraulic testing machine for compression molding to obtain a cylindrical rod-shaped green body;
7.3 removing the pore-forming agent from the cylindrical rod-shaped green body through a water solution method or a heating method;
7.4 sintering the green body in a vacuum tungsten wire sintering furnace at 1200 C-1800 C;
during the heating process, keeping the heating rate at 10 C/min, the vacuum degree at about 10-3 Pa and the holding time for 3 h, and then cooling the green body with the furnace to obtain a three-dimensional penetrating self-continuous porous framework made of a refractory metal or compound thereof;
7.5 placing the framework made of the refractory metal or compound thereof in the center of a cylindrical mold, then adding other required elements to a smelting furnace in the form of element or compound to be smelted into a liquid state, and then pouring the liquid metal into the mold to obtain a cylindrical multi-component alloy rod;
and
7.6 treating the surface of the multi-component alloy rod to make the dimensional accuracy and surface quality thereof meet the requirements of the PREP method.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/669,865Filed 11 Feb 2022 · continuation
Priority: CN 202210027237.311 Jan 2022
Published: US 2023/0219133 A113 Jul 2023
Granted: 5 Mar 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification26 codes

B22F 1/065
Metallic powder characterised by the shape of the particles: spherical particles
B22F 1/145
Treatment of metallic powder: chemical treatment, e.g. passivation or decarburisation
B22F 3/11
Sintering only: making porous workpieces or articles
B22F 3/1134
By using decomposable, meltable or sublimatable fillers: inorganic fillers