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Preparation method of near-eutectic nb-si-mo alloy with lamellar structure orientation arrangement characteristics

A directional arrangement and lamellar technology, which is applied in the field of high temperature structural material preparation, can solve the problems of complex preparation process, affect the stability of material structure, coarse structure, etc., achieve simple preparation process, ensure structure stability, and eliminate component segregation. Effect

Active Publication Date: 2020-03-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of layered gold by physical vapor deposition requires alternate deposition of Nb and Si. The preparation process is complicated and the structure is very coarse. The thickness of a single layer of Nb or Nb5Si3 is about 0.1-0.5mm. In addition, there may be some metastable phases in the alloy. , which affects the stability of the material structure, requires subsequent treatment to completely eliminate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] Preparation method of near-eutectic Nb-18Si-10Mo alloy with lamellar structure orientation

[0036] (1) commercially available pure Nb powder, pure Si powder and pure Mo powder are sieved by a metal sieve to obtain the pure Nb powder with an average particle size of 80 μm, pure Si powder and pure Mo powder;

[0037] (2) According to the composition of the Nb-18Si-10Mo alloy in atomic percentage, the pure Nb powder of 80 μm obtained in the step (1), pure Si powder and pure Mo powder are weighed by an electronic balance, and then planetary Mix in a ball mill for 2 hours without adding any balls during the mixing process to obtain a mixed powder;

[0038] (3) Put the mixed powder obtained in step (2) in the powder feeder of the laser rapid prototyping system, use high-purity argon as the powder feeding airflow, the powder-carrying airflow is: 8L / min, and use argon as the shielding gas , the protective gas flow rate is: 20L / min;

[0039] (4) DZ125 alloy with a size of 300...

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Abstract

The invention belongs to the technical field of preparation of high-temperature structural materials, and relates to a method for preparing a near-eutectic Nb-Si-Mo alloy with the characteristics of directional arrangement of lamellar structures. The invention adopts powder-feeding laser rapid prototyping technology to prepare near-eutectic Nb-Si-Mo alloy with the characteristics of fine lamellar directional arrangement structure, and uses commercially available pure element powder as raw material, without special preparation of spherical powder or pre-alloyed powder , The raw material preparation process is simple. The alloy consists of Nb solid solution phase and β‑Nb 5 Si 3 Composed of two phases, lamellar Nb solid solution phase and lamellar β-Nb with a size of about 100-500nm 5 Si 3 Phases are arranged alternately, and all lamellar Nb solid solution phases and lamellar β-Nb 5 Si 3 The phases are arranged approximately in the same direction. Compared with the Nb-Si-Mo eutectic alloy prepared by the traditional directional solidification process and magnetron sputtering process, the present invention is based on the characteristics of laser rapid melting and solidification, and can obtain a finer lamellar structure, making the near-eutectic composition The Nb-Si-Mo alloy of the present invention can also realize the full eutecticization of the microstructure.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature structural materials, and relates to a method for preparing a near-eutectic Nb-Si-Mo alloy with lamellar structure orientation arrangement characteristics. Background technique [0002] In order to meet the development needs of high thrust ratio aeroengine blades, research on new ultra-high temperature structural materials with a temperature bearing capacity exceeding 1200 °C is one of the current research hotspots in the field of materials. As a next-generation high-temperature structural material, Nb-Si-based alloys show attractive application prospects and have attracted widespread attention. They are considered to be the most promising new-generation ultra-high-temperature structural materials that can replace the existing nickel-based superalloys in the short term. [0003] Processes and alloying elements will have a significant impact on the microstructure of Nb-Si-ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/04B22F3/105C22C1/04
CPCC22C1/045B22F7/04B22F2007/045B22F10/00B22F10/34B22F10/36B22F10/28B22F12/46B22F12/70B22F10/32Y02P10/25
Inventor 刘伟熊华平李能陈冰清秦仁耀孙兵兵
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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