Nb-Hf-Zr-TiO2 alloy bar and preparation method thereof

A technology of nb-hf-zr-tio2 and alloy rods, applied in the field of Nb-Hf-Zr-TiO2 alloy rods and its preparation, can solve problems such as limited prospects, achieve improved room temperature plasticity, high temperature mechanical properties, Effect of Good Room Temperature Plasticity and Tensile Strength

Active Publication Date: 2016-11-16
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the high-temperature mechanical properties and fatigue strength of niobium alloys can be improved to a certain extent through alloying modificatio

Method used

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  • Nb-Hf-Zr-TiO2 alloy bar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] This example Nb-Hf-Zr-TiO 2 Alloy bars are made of the following mass percentages of raw materials: Hf 5%, Zr 5%, TiO 2 7%, the balance is Nb.

[0026] Preparation of Nb-Hf-Zr-TiO in this example 2 The method of alloy bars includes the following steps:

[0027] Step 1. Place niobium powder, hafnium powder, zirconium powder and titanium dioxide powder in a ball mill, and mix them uniformly under the protection of argon atmosphere to obtain mixed powder; the ball milling speed of the ball mill is 250r / min, The ball milling time is 15 hours; the particle size of the hafnium powder and zirconium powder is not more than 10 μm, the particle size of the titanium dioxide powder is not more than 5 μm, and the particle size of the niobium powder is not more than 20 μm; the hafnium powder, zirconium powder and titanium dioxide powder The mass purity of the niobium powder is not less than 99.5%, and the mass purity of the niobium powder is not less than 99.9%;

[0028]...

Example Embodiment

[0034] Example 2

[0035] This example Nb-Hf-Zr-TiO 2 Alloy bars are made of the following mass percentage of raw materials: Hf 2%, Zr 3%, TiO 2 4%, the balance is Nb.

[0036] Preparation of Nb-Hf-Zr-TiO in this example 2 The method of alloy bars includes the following steps:

[0037] Step 1. Place the niobium powder, hafnium powder, zirconium powder and titanium dioxide powder in a ball mill and mix them evenly by ball milling in an argon atmosphere to obtain a mixed powder; the ball milling speed of the ball mill is 200 r / min, and the ball milling of the ball mill The particle size of the hafnium powder and zirconium powder is not greater than 10 μm, the particle size of the titanium dioxide powder is not greater than 5 μm, and the particle size of the niobium powder is not greater than 20 μm; the size of the hafnium powder, zirconium powder and titanium dioxide powder The mass purity is not less than 99.5%, and the mass purity of the niobium powder is not less than 99.9%;

[003...

Example Embodiment

[0043] Example 3

[0044] This example Nb-Hf-Zr-TiO 2 The alloy bars are made of the following mass percentage of raw materials: Hf 8%, Zr 7%, TiO 2 10%, the balance is Nb.

[0045] Preparation of Nb-Hf-Zr-TiO in this example 2 The method of alloy bars includes the following steps:

[0046] Step 1. Place niobium powder, hafnium powder, zirconium powder and titanium dioxide powder in a ball mill, and mix them uniformly under the protection of argon atmosphere to obtain mixed powder; the ball milling speed of the ball mill is 300r / min, The time of ball milling is 20h; the particle size of the hafnium powder and zirconium powder is not more than 10μm, the particle size of the titanium dioxide powder is not more than 5μm, and the particle size of the niobium powder is not more than 20μm; the hafnium powder, zirconium powder and titanium dioxide powder The mass purity of the niobium powder is not less than 99.5%, and the mass purity of the niobium powder is not less than 99.9%;

[0047] ...

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Abstract

The invention provides a Nb-Hf-Zr-TiO2 alloy bar which is prepared from the following raw materials in percentage by mass: 2-8% of Hf, 3-7% of Zr, 4-10% of TiO2 and the balance of Nb. The invention further provides a preparation method of such alloy bar. The preparation method comprises the following steps: 1, putting Nb, Hf, Zr and TiO2 into a ball mill, and uniformly mixing the raw materials by ball milling under the protection of an argon atmosphere, so as to obtain mixed powder; 2, carrying out compression molding to obtain a blank; 3, putting the blank into a shell, vacuumizing, and then enclosing the shell; 4, carrying out hot isostatic pressing to obtain a Nb-Hf-Zr-TiO2 alloy sintered body; and 5, carrying out hot extrusion to obtain the Nb-Hf-Zr-TiO2 alloy bar. The Nb-Hf-Zr-TiO2 alloy bar provided by the invention is good in room-temperature plasticity and tensile strength, is excellent in fatigue strength and high-temperature strength, and can be applied to an engine component of an aircraft turbine engine.

Description

technical field [0001] The invention belongs to the technical field of alloy rods, in particular to a kind of Nb-Hf-Zr-TiO 2 Alloy bar and its preparation method Background technique [0002] Niobium alloys have been extensively studied in the 1950s as candidate materials for aerospace, nuclear engineering, and aircraft engines. Although niobium alloys are attractive in terms of room temperature plasticity, formability, density and melting point, their poor fatigue strength has become a major obstacle for their application as high-temperature structural materials. At the same time, when the service temperature exceeds 1100°C, the creep resistance of niobium alloys decreases significantly. Adding alloying elements (Mo, Ta, V, W, Hf, Zr, Ti, etc.) to niobium can form a niobium alloy with high alloy concentration, its high-temperature mechanical properties are significantly improved, and its processing performance is good, so it is used as a high-temperature structural materi...

Claims

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Application Information

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IPC IPC(8): C22C27/02C22C32/00C22C1/05C22C1/10B22F3/15B22F3/20
CPCB22F3/15B22F3/20C22C1/05C22C27/02C22C32/0031
Inventor 喻吉良郑欣刘辉王峰
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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