Low-cost method for preparing niobium-base alloy

A niobium-based alloy, low-cost technology, applied in the field of low-cost preparation of niobium-based alloys, can solve the problems of restricting the application of powder metallurgy niobium-based alloys, low yield of fine particle size powder, difficulty in popularization and application, etc., to achieve large lattice distortion , Low preparation cost, cost reduction effect

Active Publication Date: 2015-03-04
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high melting point of niobium-based alloys, the rotating electrode atomization process is mainly used to prepare niobium-based alloy powders at present, which has the problems

Method used

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  • Low-cost method for preparing niobium-base alloy
  • Low-cost method for preparing niobium-base alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Preparation of Nb-15%Ti-3%Al-4.5%Cr-5%V-0.5%Mo-3%W-2.5Hf-0.04%C alloy

[0019] The composition of the master alloy is designed according to the composition of the target niobium-based alloy. The composition of the master alloy is: 21.4%Ti, 4.3%Al, 6.4%Cr, 7.1%V, 0.7%Mo, 4.3%W, 3.6%Hf, 0.057%C and Balance niobium. Weigh TiNb alloy, TiAl alloy, chromium block, vanadium block, TiMo alloy, tungsten sheet, Hf grain, graphite powder and Nb rod according to the master alloy composition. Various raw materials are smelted in an electron beam melting furnace to obtain master alloy ingots. The niobium-based alloy ingot was cut into 1mm-thick slices by wire cutting, and then hydrogenated in high-purity hydrogen at a hydrogenation temperature of 550°C for 4 hours at a cooling rate of 0.5°C / min. During the hydrogenation process, a small amount of highly reducing magnesium particles are placed in the furnace to absorb impurity oxygen in the atmosphere. The hydrogenated a...

Embodiment 2

[0020] Example 2: Preparation of Nb-16%Ti-4%Al-4.5%Cr-4%V-0.5%Mo-3%W-2.8Hf-0.05%C alloy

[0021] The composition of the master alloy is designed according to the composition of the target niobium-based alloy. The composition of the master alloy is: 21.3%Ti, 5.3%Al, 6%Cr, 5.3%V, 0.7%Mo, 4%W, 3.7%Hf, 0.067%C and Balance niobium. Weigh TiNb alloy, TiAl alloy, chromium block, vanadium block, TiMo alloy, tungsten sheet, Hf grain, graphite powder and Nb rod according to the master alloy composition. Various raw materials are smelted in an electron beam melting furnace to obtain master alloy ingots. The niobium-based alloy ingot was cut into 2mm-thick slices by wire cutting, and then hydrogenated in high-purity hydrogen at a hydrogenation temperature of 750°C for 2 hours at a cooling rate of 1°C / min. During the hydrogenation process, a small amount of highly reducing calcium particles are placed in the furnace to absorb impurity oxygen in the atmosphere. The hydrogenated alloy fla...

Embodiment 3

[0022] Example 3: Preparation of Nb-14%Ti-3.5%Mo-3.5%V-2%Si-0.75%Hf-0.03%C Alloy

[0023] The composition of the master alloy is designed according to the composition of the target niobium-based alloy. The composition of the master alloy is: 18.7% Ti, 4.7% Mo, 4.7% V, 2.7% Si, 1% Hf, 0.04% C and the balance niobium. Weigh the TiNb alloy, TiMo alloy, vanadium block, silicon particle, graphite powder and Nb rod according to the composition of the master alloy. Various raw materials are smelted in an electron beam melting furnace to obtain master alloy ingots. The niobium-based alloy ingot is cut into 2mm-thick slices by wire cutting, and then hydrogenated in high-purity hydrogen at a hydrogenation temperature of 800°C for 1 hour at a cooling rate of 0.5-3°C / min. During the hydrogenation process, a small amount of highly reducing lithium sheets are placed in the furnace to absorb impurity oxygen in the atmosphere. The hydrogenated alloy flakes are mechanically crushed to obtain...

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Abstract

The invention provides a low-cost method for preparing a niobium-base alloy, belonging to the technical field of refractory alloys. The method comprises the following steps: designing an interalloy according to the components of the target niobium-base alloy, and melting in an electron-beam melting furnace to obtain an interalloy cast ingot; after cutting the interalloy cast ingot into sheets, hydrogenating in high-purity hydrogen gas, and mechanically crushing to obtain fine-particle-size hydrogen absorption powder; carrying out partial dehydrogenation on the fine-particle-size hydrogen absorption powder in a vacuum atmosphere to obtain partially dehydrogenated interalloy powder; and uniformly mixing the partially dehydrogenated interalloy powder with niobium powder, mixing on a mixer to obtain a feed material with uniform rheological properties, forming the feed material on an injection molder, removing the adhesive by solvent degreasing and hot degreasing, and carrying out vacuum sintering to obtain the niobium-base alloy. The method has the advantages of low cost of the raw material powder and simple preparation technique.

Description

technical field [0001] The invention belongs to the technical field of refractory metals, and particularly provides a low-cost method for preparing niobium-based alloys. Background technique [0002] Niobium alloy has excellent properties such as high melting point, low density, and high high-temperature strength. It is an important high-temperature structural material and has great application potential in the aerospace field. At present, the preparation of niobium alloys mainly adopts the technology of electron beam melting, forging or hot extrusion to prepare plates or rods, and then through mechanical processing to make parts of required shape and size. Due to the high deformation resistance and brittleness of niobium-based alloys at room temperature, it is difficult to prepare niobium-based alloy parts with complex shapes. The powder metallurgy process has greater flexibility in the preparation of complex shapes of niobium-based alloy parts, and the composition of the ...

Claims

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Application Information

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IPC IPC(8): C22C27/02C22C1/05
Inventor 章林李启军曲选辉李兵兵秦明礼何新波张瑞杰
Owner UNIV OF SCI & TECH BEIJING
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