Method for preparing Ti2AlNb alloy by using vacuum pressure infiltration method

A technology of vacuum pressure infiltration and alloying, applied in the field of preparation of Ti2AlNb alloy, can solve the problem of uneven distribution of Nb and Al elements, and achieve the effect of low production cost, simple process and huge market prospect.

Inactive Publication Date: 2014-04-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to first solve the problem of uneven distribution of Nb and Al elements in the casting and smelt

Method used

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  • Method for preparing Ti2AlNb alloy by using vacuum pressure infiltration method
  • Method for preparing Ti2AlNb alloy by using vacuum pressure infiltration method

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specific Embodiment approach 1

[0015] Specific embodiment one: a kind of vacuum pressure impregnation method of this embodiment prepares Ti 2 The method of AlNb alloy is carried out according to the following steps:

[0016] 1. Weigh 50.1% to 56.5% of pure Ti powder, 22.5% to 24.4% of Nb powder and 21.0% to 25.5% of Al-Y rare earth alloy bulk according to mass percentage, wherein the Al- The mass percentage of Y in the Y alloy is 4%-6%; wherein, the particle size of pure Ti powder is 100-160 μm, and the particle size of Nb powder is 15-30 μm;

[0017] 2. Carry out low-energy ball milling of the pure Ti powder and Nb powder taken in step 1, collect the Ti powder and Nb powder after ball milling, and mix them uniformly to obtain a composite powder of titanium and niobium, and deposit it in a steel mould; Among them, the ball-to-material ratio of the low-energy ball mill is 2-8:1, the ball-milling speed is 80-150r / min, and the ball-milling time is 1-6h;

[0018] 3. Place the rare earth aluminum alloy Al-Y bl...

specific Embodiment approach 2

[0020] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, 54%~56% Ti powder, 23%~24% Nb powder and 21%~ 22% Al-Y rare earth alloy bulk. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the Ti powder of 55%, the Nb powder of 23% and the Al-Y of 22% are respectively weighed according to the mass percentage content described in step one Rare earth alloy bulk. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing a Ti2AlNb alloy by using a vacuum pressure infiltration method and a method for preparing the Ti2AlNb alloy. The method disclosed by the invention is used for solving the problems of non-uniform distribution of elements such as Nb and Al and shrinkage cavity, pores and inclusion of the Ti2AlNb alloy in a conventional cast melting method for preparing the Ti2AlNb alloy are solved. The method comprises the following steps: 1, weighing 50.1-56.5 percent of pure Ti powder, 22.5-24.4 percent of Nb powder and 21.0-25.5 percent of Al-Y rare earth alloy block; 2, performing low-energy ball milling on pure titanium particles and niobium powder; 3, putting the rare earth aluminum alloy Al-Y block on the composite titanium and niobium powder, performing infiltration, so as to enable the melted Al-Y alloy to be fully penetrated into the composite titanium and niobium powder, reducing the pressure, performing heat preservation and pressure maintaining, and reacting and sintering to obtain the Ti2AlNb alloy. The method is simple in process, easy to operate, short in preparation period and low in manufacturing cost.

Description

technical field [0001] The present invention relates to a kind of Ti 2 Preparation method of AlNb alloy. Background technique [0002] Ti 2 AlNb alloy has the advantages of low density, excellent fracture toughness, specific strength and specific stiffness at high temperature, high temperature creep resistance, oxidation resistance and low thermal expansion coefficient, and is considered to be ideal for aero-engines to achieve performance improvement through structural weight reduction. Light specific gravity high temperature structural material, following γ-TiAl, α 2 After -Ti3Al-based alloys, another research hotspot. [0003] Usually, Ti 2 AlNb alloy adopts casting melting method. During the smelting process, due to the large proportion of Nb element and its high melting point, it is easy to segregate. On the contrary, the Al element has a small proportion and low melting point and is easy to volatilize, resulting in inaccurate composition and uneven distribution of ...

Claims

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Application Information

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IPC IPC(8): C22C1/00C22C14/00
Inventor 李爱滨范国华陈锐谭振斌耿林
Owner HARBIN INST OF TECH
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