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Beta titanium alloy for fastener and manufacturing method

A technology of β-titanium alloys and fasteners, applied in the field of β-type titanium alloys, can solve the problems of high-strength applications and low-cost production at the same time, and achieve significant economic benefits, high-strength, and low-cost mass production.

Active Publication Date: 2009-01-14
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency that the existing technology cannot meet the requirements of high-strength application and low-cost production at the same time, the present invention provides a β-type titanium alloy, which not only has high strength but also can be mass-produced at low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The weight percentages of the titanium alloy are: molybdenum 4%, niobium 6.5%, chromium 3%, tantalum 3%, aluminum 2%, and the balance is titanium and impurities. The weight percentages of impurities are: iron 1.0%, carbon 0.1%, nitrogen 0.05%, 0.015% hydrogen, 0.02% oxygen.

[0016] The preparation method of the titanium alloy includes the following steps:

[0017] 1. Using sponge titanium, pure aluminum, pure chromium, Ti-31% Mo, Ti-53% Nb, Al-80% Ta as raw materials, the proportions are Mo: 5%, Nb: 5%, Cr: 4%, Ta: 2%, Al: 3% mixed with 100Kg, pressed into block electrode with hydraulic machine;

[0018] 2. Use ion welding to group the 3 electrodes into long strip electrodes;

[0019] 3. Use the electrode prepared in the previous step as a consumable electrode for smelting in a vacuum consumable electric arc furnace, and then use the obtained ingot as a consumable electrode for smelting again at a smelting temperature of 1950°C to obtain a finished titanium alloy ingot;

...

Embodiment 2

[0024] The weight percentages of titanium alloy are: Molybdenum 7%, Niobium 4%, Chromium 5%, Tantalum 1%, Aluminum 4%, and the balance is titanium and impurities. The weight percentages of impurities are: iron 0.5%, carbon 0.05%, nitrogen 0.025%, hydrogen 0.01%, oxygen 0.01%.

[0025] The preparation method of the titanium alloy includes the following steps:

[0026] 1. Using sponge titanium, pure aluminum, pure chromium, Ti-31% Mo, Ti-53% Nb, Al-80% Ta as raw materials, the proportions by weight percentage are Mo: 7%, Nb: 6.5%, Cr: 3%, Ta: 3%, Al: 3% mixed with 100Kg, press it into block electrode with hydraulic machine;

[0027] 2. Use ion welding to group the 4 electrodes into long strip electrodes;

[0028] 3. Use the electrode prepared in the previous step as a consumable electrode for smelting in a vacuum consumable electric arc furnace, and then use the obtained ingot as a consumable electrode for smelting again at a smelting temperature of 1730°C, repeat 3 times To obtain ...

Embodiment 3

[0033] The weight percentages of titanium alloy are: molybdenum 5%, niobium 5%, chromium 4%, tantalum 2%, aluminum 3%, and the balance is titanium and impurities. The weight percentages of impurities are: iron 0.02%, carbon 0.03%, nitrogen 0.01%, hydrogen 0.005%, oxygen 0.008%.

[0034] The preparation method of the titanium alloy includes the following steps:

[0035] 1. Using sponge titanium, pure aluminum, pure chromium, Ti-31% Mo, Ti-53% Nb, Al-80% Ta as raw materials, the proportions are Mo: 4%, Nb: 4%, Cr: 5%, Ta: 1%, Al: 3% mixed with 100Kg, pressed into block electrode with hydraulic machine;

[0036] 2. Use ion welding to group the 4 electrodes into long strip electrodes;

[0037] 3. Use the electrode prepared in the previous step as a consumable electrode for smelting in a vacuum consumable electric arc furnace, and then use the obtained ingot as a consumable electrode for smelting again at a melting temperature of 1840°C, repeat 3 times, Obtain finished titanium alloy i...

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Abstract

The invention discloses a Beta titanium alloy used for a fastener. The Beta titanium alloy comprises the following components, in weight percentage: molybdenum: 4 to 7 percent, niobium: 4 to 6.5 percent, chromium: 3 to 5 percent, tantalum: 1 to 3 percent, aluminum: 2 to 4 percent, iron: 1.0 percent or less, carbon: 0.1 percent or less, nitrogen: 0.05 percent or less, hydrogen: 0.015 percent or less, oxygen: 0.02 percent or less, balance titanium. A preparation method thereof is characterized in that after sponge titanium, pure aluminum, pure chromium, Ti-0.31Mo, Ti-0.53Nb and Al-0.80Ta are mixed and pressed with a pressing machine into block-shaped electrodes; a plurality of electrodes are welded with an ion welding machine into a long strip-shaped electrode which is taken as a consumable electrode and melted in a vacuum consumable arc furnace, the obtained casting ingot is again taken as the consumable electrode and melted for 2 to 3 times to acquire the product titanium alloy ingot. The invention has the advantages that the intensity is high, the low-cost large-scale production can be realized, the intensity requirements can be satisfied, the processing and modeling are easy, and the energy consumption is reduced.

Description

Technical field [0001] The invention relates to a β-type titanium alloy and a preparation method thereof. Background technique [0002] Titanium alloy and carbon fiber composite materials have similar electrode potentials, which can effectively prevent the galvanic corrosion of fasteners, and have good elasticity and non-magnetic properties. They can prevent the loosening of fastening bolts and prevent magnetic field interference, making it the only composite material The connection material. With the increasing use of advanced aircraft titanium alloys and composite materials, the demand for titanium alloy fasteners is increasing. [0003] As titanium alloys for fasteners, known as TC4, BT16, TB2, TB3, Ti-15-3, β III And other titanium alloys. Although TC4 alloy has low density, good strength and fatigue properties, and low cost of semi-finished products, the plasticity at room temperature is not high enough. When forming fasteners, induction heating is required for hot upsetting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22B9/20
Inventor 李金山常辉寇宏超周中波唐斌薛祥义王一川周廉
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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