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A method for preparing high niobium titanium aluminum alloy material by two-step pressure infiltration

A titanium-aluminum alloy, infiltration technology, applied in the field of intermetallic compound material preparation, to achieve the effect of excellent material mechanical properties, improve high impurity content, and reduce material production costs

Active Publication Date: 2017-09-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are no relevant research reports on the application of infiltration technology to the preparation of high-niobium titanium-aluminum alloy materials.

Method used

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  • A method for preparing high niobium titanium aluminum alloy material by two-step pressure infiltration

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Experimental program
Comparison scheme
Effect test

Embodiment 4

[0025] -200 mesh Ti powder, -325 mesh Nb element powder and high-purity Al plate are used as raw materials, and the ratio is carried out according to the nominal composition Ti-45Al-8.5Nb. After mechanically mixing the Ti and Nb element powders uniformly, they were put into a Φ30 graphite mold, vibrated and pressed to obtain a green compact with a density of 68%. After polishing the surface of the wire-cut Al plate, place it on the powder compact in the mold, and then put the mold as a whole into a high-pressure infiltration furnace. The infiltration process is carried out under the protection of high-purity Ar gas, and the temperature is rapidly raised to 750°C at 10°C / min, and the heat preservation time is 60min. After 20min of heat preservation, an axial pressure of 20MPa is applied; °C / min. Slowly raise the temperature to 850 °C, keep the temperature for 120 min, and then continue to pressurize and cool to room temperature with the furnace to obtain a high-niobium titanium...

Embodiment 5

[0027]-500 mesh Ti, Nb element powder and high-purity Al plate are used as raw materials, and the ratio is carried out according to the nominal composition Ti-45Al-5Nb. After the Ti and Nb element powders were mechanically mixed, they were put into a Φ30 graphite mold and vibrated to obtain a powder green body with a density of 56%. After polishing the surface of the wire-cut Al plate, place it on the mixed powder in the mold, and then put the mold as a whole into a high-pressure infiltration furnace. Infiltration process in the vacuum degree ≤ 10 -1 Under the vacuum condition of Pa, the temperature is raised rapidly to 700°C at 5°C / min, and the heat preservation time is 40min, and the axial pressure of 30MPa is applied after 10min of heat preservation; the axial pressure is increased to 30MPa, and the temperature is slowly raised at 6°C / min To 1000 ℃, keep warm for 60 minutes, then continue to pressurize and cool to room temperature with the furnace, and then obtain high-nio...

Embodiment 6

[0029] -325 mesh Ti powder, -500 mesh Nb element powder and high-purity Al plate are used as raw materials, and the ratio is carried out according to the nominal composition Ti-45Al-10Nb. After the Ti and Nb elemental powders are mechanically mixed, they are put into a Φ30 graphite mold, vibrated and pressed to obtain a green compact with a density of 60%. The wire-cut Al plate is placed on the powder body in the mold, and then the whole mold is placed in a high-pressure infiltration furnace. The infiltration process is carried out under the protection of high-purity Ar gas, and the temperature is rapidly raised to 800°C at 7°C / min, and the heat preservation time is 120min. After 30min of heat preservation, an axial pressure of 10MPa is applied; °C / min. Slowly raise the temperature to 950 °C, hold the temperature for 80 minutes, and then continue to pressurize and cool to room temperature with the furnace, and then the high-niobium titanium-aluminum alloy infiltration green bo...

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Abstract

The invention discloses a method for preparing high-niobium titanium-aluminum alloy materials by pressure infiltration, which comprises uniformly mixing Ti, Nb and other element powders with high-purity Al plates into graphite molds and placing them in high-pressure infiltration furnaces; Heat up to 700~800°C at 10°C / min, keep warm for 30~60min, and apply axial pressure of 10~30MPa; heat up to 800~1000°C at 3~6°C / min, pressurize 30~50MPa, keep warm for 60~120min, Continue to pressurize and cool to room temperature with the furnace to obtain an infiltrated green body, heat treatment at 1300-1500°C / 2-6h, and then cool to room temperature with the furnace to obtain a high-density high-niobium TiAl alloy bulk material. The method has the advantages of simple process, short process, low cost, easy control of impurity content, and the advantages of net near-forming; the prepared high-niobium titanium-aluminum alloy material has high density, uniform composition and structure, and excellent mechanical properties.

Description

technical field [0001] The invention provides a method for preparing a high-niobium-titanium-aluminum alloy material by pressure infiltration, and belongs to the technical field of preparation of intermetallic compound materials. technical background [0002] TiAl-based intermetallic compounds, based on the long-range ordered arrangement of atoms and unique bonding between atoms, have the characteristics of low specific gravity, good high-temperature strength, excellent oxidation resistance, and creep resistance. Compared with other high-temperature alloys, they have more excellent high-temperature properties. Comprehensive performance, it is recognized as a new generation of lightweight high-temperature-resistant structural materials with the most application potential. The high-Nb-TiAl alloy developed by Academician Chen Guoliang in my country increases the limit service temperature of the alloy by 60-100 °C on the basis of maintaining the advantages of conventional TiAl a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F3/10C22C14/00C22C30/00C22C1/04
Inventor 路新刘程程曲选辉王涛温宏远佟健博章林
Owner UNIV OF SCI & TECH BEIJING
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