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Preparation method for complex-shape niobium-based ODS (oxide dispersion strengthening) alloy

A complex shape, niobium-based technology, applied in the field of refractory metal preparation, to achieve the effect of short manufacturing cycle, high material utilization rate and high density

Active Publication Date: 2014-09-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing niobium-based ODS alloys by laser rapid prototyping technology, which aims to solve the problems of densification of niobium-based ODS alloys and the forming of parts with complex shapes, and has the advantages of high density, excellent comprehensive mechanical properties and utilization of raw material powder Advantages such as high rate

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  • Preparation method for complex-shape niobium-based ODS (oxide dispersion strengthening) alloy

Examples

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Effect test

Embodiment 1

[0013] Example 1: Preparation of Nb-Al-based ODS alloy with complex shape

[0014] Use high-purity niobium powder, aluminum powder and Y with particle size of 20~30nm 2 o 3 Powder is used as the raw material, and the ratio is as follows: 15wt.%Al-0.3wt.%Y 2 o 3 - margin Nb. Add 0.5wt.% stearic acid to the raw material powder and pre-mix evenly, and then carry out high-energy ball milling of the mixed powder in a high-purity Ar atmosphere to make Y 2 o 3 The particles are uniformly dispersed in the niobium matrix, the ball / material ratio is 15 / 1, the rotational speed of the ball mill is 380 rpm, and the ball milling time is 40 hours to obtain niobium-based ODS alloy powder. Secondly, CAD software is used to design the 3D solid model of the part, and then the 3D model is sliced ​​into layers to discretize it into a series of 2D layers. At the same time, the powder spreading system of the SLM forming machine spreads a layer of niobium-based ODS alloy powder on the working...

Embodiment 2

[0015] Example 2: Preparation of Nb-Al-based ODS alloy with complex shape

[0016] Use high-purity niobium powder, aluminum powder and Y with particle size of 20~30nm 2 o 3 Powder is used as raw material, and the ratio is as follows: 20wt.%Al-1.0wt.%Y 2 o 3 - margin Nb. Add 1wt.% stearic acid to the raw material powder and pre-mix evenly, and then carry out high-energy ball milling of the mixed powder in a high-purity Ar atmosphere to make Y 2 o 3 The particles are uniformly dispersed in the niobium matrix, the ball / material ratio is 15 / 1, the rotational speed of the ball mill is 380 rpm, and the ball milling time is 40 hours to obtain niobium-based ODS alloy powder. Secondly, CAD software is used to design the 3D solid model of the part, and then the 3D model is sliced ​​into layers to discretize it into a series of 2D layers. At the same time, the powder spreading system of the SLM forming machine spreads a layer of niobium-based ODS alloy powder on the working platf...

Embodiment 3

[0017] Example 3: Preparation of complex shape Nb-Al-Ti based ODS alloy

[0018] High-purity niobium powder, aluminum powder, titanium powder and Y powder with particle size of 20~30nm 2 o 3 Powder is the raw material, and the proportion is as follows: 15wt.%Al-25wt.%Ti-1.5wt.%Y 2 o 3 - margin Nb. Add 1.5wt.% stearic acid to the raw material powder and pre-mix evenly, and then carry out high-energy ball milling of the mixed powder in a high-purity Ar atmosphere to make Y 2 o 3 The particles are uniformly dispersed in the niobium matrix, the ball / material ratio is 15 / 1, the rotational speed of the ball mill is 380 rpm, and the ball milling time is 40 hours to obtain niobium-based ODS alloy powder. Secondly, CAD software is used to design the 3D solid model of the part, and then the 3D model is sliced ​​into layers to discretize it into a series of 2D layers. At the same time, the powder spreading system of the SLM forming machine spreads a layer of niobium-based ODS all...

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Abstract

The invention discloses a method for preparing niobium-based ODS alloy with complex shapes by using high-energy ball-milled niobium-based ODS alloy powder as a raw material and adopting laser rapid prototyping technology, belonging to the technical field of refractory metal preparation. First, the niobium-based ODS alloy powder is obtained by mechanical alloying process, and then based on the establishment of the three-dimensional solid model and layered slice processing, the movement of the laser beam is controlled by two-dimensional plane information to deposit the niobium-based ODS alloy powder layer by layer to obtain niobium Base ODS alloy body. Finally, hot isostatic pressing is used to make the niobium-based ODS alloy body fully dense, so as to obtain niobium-based ODS alloy parts with complex shapes. The invention is a low-cost, fast and efficient technology for preparing parts with complex shapes, which is suitable for near-net forming of difficult-to-machine and high-performance niobium-based ODS alloys. The parts have high density, small, uniform and stable rapid solidification structure, excellent comprehensive mechanical properties, high material utilization rate, short manufacturing cycle and low cost.

Description

technical field [0001] The invention belongs to the technical field of refractory metal preparation, and in particular provides a method for preparing a niobium-based oxide dispersion strengthening (Oxide Dispersion Strengthening, ODS) alloy by using mechanical alloying powder as a raw material and adopting laser rapid forming technology. Background technique [0002] Niobium-based alloys have the smallest density among refractory metals, and have the advantages of high melting point, excellent high-temperature mechanical properties, and good welding performance. The melting point of commonly used nickel-based superalloys is about 1300~1400°C, and the maximum service temperature has reached about 1200°C, which is close to the service temperature limit of the material. Niobium-based alloy is a high-temperature structural material with a higher service temperature, and has important uses in key components used in the aviation and aerospace fields. Niobium-based alloys are gen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C27/02
Inventor 章林曲选辉秦明礼刘烨何新波
Owner UNIV OF SCI & TECH BEIJING
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