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Method for preparing light Nb-Ti-Al based porous material

An nb-ti-al, porous material technology, applied in the field of powder metallurgy porous materials, can solve problems such as low strength, and achieve the effects of improving strength, simple process, flexible and convenient operation

Active Publication Date: 2015-03-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the porous niobium prepared by this method has high porosity, its strength is low

Method used

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  • Method for preparing light Nb-Ti-Al based porous material
  • Method for preparing light Nb-Ti-Al based porous material

Examples

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Effect test

Embodiment 1

[0016] Example 1: Preparation of lightweight Nb-Ti-Al-based porous material with a porosity of 25%

[0017] Using -300 mesh niobium powder, -300 mesh titanium powder, -200 mesh aluminum powder, -300 mesh chromium powder, -500 mesh tungsten powder, -500 mesh graphite powder as raw materials, according to the composition ratio of mechanical alloying powder quantity. The composition of the mechanical alloying powder is: 27wt.%Ti-6wt.%Al-2wt.%Cr-1wt.%W-0.02wt.%C-balance Nb. Add 0.5wt.% stearic acid to the raw material powder and pre-mix evenly, and then uniformly disperse various alloying elements in the niobium matrix by high-energy ball milling in a high-purity Ar atmosphere to form a supersaturated solid solution. The ball / material ratio was 15 / 1, the rotational speed of the ball mill was 500 rpm, and the ball milling time was 36 hours, to obtain a mechanically alloyed powder with an average particle size of 18 μm. The mechanical alloying powder and the rotating electrode ato...

Embodiment 2

[0018] Example 2: Preparation of lightweight Nb-Ti-Al-based porous material with a porosity of 29%

[0019] Using -300 mesh niobium powder, -300 mesh titanium powder, -200 mesh aluminum powder, -300 mesh chromium powder, -500 mesh tungsten powder, -500 mesh graphite powder as raw materials, according to the composition ratio of mechanical alloying powder quantity. The composition of the mechanical alloying powder is: 28wt.%Ti-8wt.%Al-4wt.%Cr-5wt.%)W-0.03wt.%C-balance Nb. Add 1wt.% stearic acid to the raw material powder and pre-mix evenly, and then uniformly disperse various alloying elements in the niobium matrix by high-energy ball milling in a high-purity Ar atmosphere to form a supersaturated solid solution. The ball / material ratio was 17 / 1, the rotational speed of the ball mill was 400 rpm, and the ball milling time was 24 hours, to obtain a mechanically alloyed powder with an average particle size of 32 μm. The mechanical alloying powder and the rotating electrode atom...

Embodiment 3

[0020] Example 3: Preparation of lightweight Nb-Ti-Al-based porous material with a porosity of 32%

[0021]Using -300 mesh niobium powder, -300 mesh titanium powder, -200 mesh aluminum powder, -300 mesh chromium powder, -500 mesh tungsten powder, -500 mesh graphite powder as raw materials, according to the composition ratio of mechanical alloying powder quantity. The composition of the mechanical alloying powder is: 30wt.%Ti-8wt.%Al-6wt.%Cr-3wt.%)W-0.05wt.%C-balance Nb. Add 1.5wt.% stearic acid to the raw material powder and pre-mix evenly, and then uniformly disperse various alloying elements in the niobium matrix by high-energy ball milling in a high-purity Ar atmosphere to form a supersaturated solid solution. The ball / material ratio was 19 / 1, the rotational speed of the ball mill was 450 rpm, and the ball milling time was 48 hours to obtain a mechanically alloyed powder with an average particle size of 27 μm. The mechanical alloying powder and the rotating electrode atom...

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Abstract

The invention provides a method for preparing a light Nb-Ti-Al based porous material, and belongs to the technical field of powder metallurgy porous materials. The method comprises the following process procedures: firstly, performing high energy ball milling on niobium powder, titanium powder, aluminum powder and element powder of other alloy elements to obtain mechanical alloyed powder; uniformly mixing Nb-Ti-Al based alloy powder with rotating electrode atomized niobium alloy powder through ball milling and forming at the pressure of 200-700 MPa to obtain a formed blank; performing vacuum pressure-free sintering and thermal treatment on the formed blank to obtain the Nb-Ti-Al based porous material. Pores are formed by virtue of the Kirkendall effect that pores are formed in a substrate because of partial diffusion of the Al element, and the strength of a porous body is improved with the combination of a sintered neck formed by the atomized alloy powder. The light Nb-Ti-Al based porous material is simple in preparation process, and the porous structure is easy to control.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy porous materials, and particularly provides a method for preparing lightweight Nb-Ti-Al-based porous materials. Background technique [0002] Niobium has the smallest density among refractory metals. Adding strengthening elements such as Ti and Al to the niobium matrix can further reduce the density of niobium alloys, and maintain the characteristics of high melting point, high-temperature mechanical properties and excellent welding properties of niobium-based alloys. Nb-Ti-Al-based porous material is a lightweight structure-function integrated material, and its service temperature is higher than 1200°C, which is higher than the currently used nickel-based alloy porous material and TiAl intermetallic compound porous material. , has important application prospects in the fields of catalyst supports, filters and heat exchangers used under high temperature conditions. The preparation metho...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C27/02C22C30/00
Inventor 章林李兵兵李启军曲选辉秦明礼何新波
Owner UNIV OF SCI & TECH BEIJING
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