Three-dimensional network distributed Ti2AlN particle reinforced TiAl-based composite material and preparation method thereof

Abstract

The invention discloses a three-dimensional network distributed Ti2AlN particle reinforced TiAl-based composite material and a preparation method thereof, and relates to a Ti2AlN particle reinforced TiAl-based composite material and a preparation method thereof. The composite material consists of a Ti2AlN particle reinforcing phase and a TiAl matrix, wherein Ti2AlN particles are distributed in the TiAl matrix in a three-dimensional network shape. The method comprises the following steps of: performing nitriding treatment on titanium powder to obtain nitrided titanium powder, performing hot pressing and sintering on the mixture of the nitrided titanium powder and aluminum powder, and thus obtaining the composite material. The structure of the TiAl matrix is thinned, and the reinforcing phase Ti2AlN particles are distributed in the TiAl matrix in the three-dimensional network shape and encircle the TiAl crystal colonies to form a structure which is more stable than a single TiAl alloy. The composite material has higher structural thermal stability and good long-time service performance under the high-temperature condition, the high-temperature compression strength of the composite material is improved, and the compression strength of the composite material at the temperature of 900 DEG C reaches 958.9MPa.

Description

technical field [0001] The present invention relates to a kind of Ti 2 AlN particle reinforced TiAl-based composite material and its preparation method. Background technique [0002] The good high-temperature strength, creep resistance and oxidation resistance of TiAl alloy make it a light-weight high-temperature structural material with great application potential. However, its poor room temperature plasticity and thermal deformation ability, and microstructure instability at high temperature limit its wide application. Therefore, the method of improving the properties of TiAl alloys by introducing reinforcements has attracted extensive attention. [0003] Using Ti 2 AlN ceramics as a reinforcement to prepare Ti 2 The key to AlN particle-reinforced TiAl-based composites is how to introduce the third element—nitrogen. Currently reported Ti 2 The preparation method and existing problems of AlN reinforced TiAl-based composite materials are as follows: [0004] (1) Spray...

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Problems solved by technology

The disadvantages are: the droplet flight time is short, and the amount of nitriding on the surface is limited, so it is difficult to control Ti in a large range. 2 volume fraction of AlN; it is difficult to form a single Ti in the resulting material 2 The AlN reinforcement phase also contains a small amount of other types of nitrides; the Ti in the resulting material 2 AlN is distributed in a wave shape, resulting in anisotropy of the material; the density of the material needs to be further improved

The disadvantage is that it is difficult to mix the three raw material powders evenly, and it is easy to cause Ti 2 AlN reinforcement particles are agglomerated, and long-time ball milling is required to reduce agglomeration;

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