TiAl/Ti2AlN intermetallic compound composite material and its preparing method

An intermetallic compound and composite material technology, which is applied in the field of preparation of TiAl intermetallic compound materials, can solve the problems of material performance barriers, difficulty in eliminating pores, and difficulty in the distribution of ceramic phase particles, and achieves high adjustability and low cost. , The effect of uniform and dense structure

Inactive Publication Date: 2009-05-20
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, this method is difficult to evenly distribute the ceramic phase particles generated in situ on the grain boundaries of the metal phase, and some pores are difficult to eliminate, which poses a great obstacle to the further improvement of material properties.

Method used

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  • TiAl/Ti2AlN intermetallic compound composite material and its preparing method
  • TiAl/Ti2AlN intermetallic compound composite material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, at first by mass percentage 37% Ti, 63% Al are made mixture; Add the sodium stearate dispersant of mixture quality 0.5% in the mixture, adopt dry process ball milling in planetary ball mill with 800 revolutions The rotation speed per minute, the mass ratio of material to ball is 1:10, and the ball milling time is 27 hours to make it mechanically alloyed to form fine amorphous powder; dry the alloyed amorphous powder at 70°C for 4 hours; Put the powder into a graphite grinding tool, and heat-press and sinter at 1200°C and 28MPa pressure for 1.5 hours under argon or vacuum conditions. The obtained composite material is composed of matrix phase and reinforcement phase, and the matrix phase is composed of TiAl phase and Ti 3 Al phase composition, reinforcement phase is Ti 2 AlN. see figure 1 , figure 1 The XRD analysis results of the alloyed powder sintered at 1200°C show that the main crystal phases are TiAl and Ti 2 AlN phase and a small amount of Ti 3...

Embodiment 2

[0012] Embodiment 2, at first 84% Ti, 16% Al are made into mixture by mass percentage; Add the sodium stearate dispersant of mixture quality 0.3% in the mixture, adopt dry process ball milling in planetary ball mill with 780 turns The rotation speed per minute, the mass ratio of the material to the ball is 1:10, and the ball milling time is 25 hours to make it mechanically alloyed to form a fine amorphous powder; dry the alloyed amorphous powder at 76°C for 5 hours; Put the powder into a graphite grinding tool, and heat-press and sinter at 1000°C and 35MPa pressure for 2.0 hours under argon or vacuum conditions.

Embodiment 3

[0013] Embodiment 3, at first 50% Ti, 50% Al are made mixture by mass percentage; Add the sodium stearate dispersant of mixture quality 0.2% in the mixture, adopt dry process ball milling in planetary ball mill with 720 turns The rotation speed per minute, the mass ratio of the material to the ball is 1:10, and the ball milling time is 26 hours to make it mechanically alloyed to form a fine amorphous powder; dry the alloyed amorphous powder at 72°C for 4.3 hours; Put the powder into a graphite grinding tool, and sinter it under argon or vacuum at 950°C and a pressure of 17MPa for 2.5 hours.

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Abstract

A composite material that produced by the metal compound of TiAlTi2AlN and the method of preparation of it. First mix the Ti powder, whose quality is 37% to 84% of the total, and the Al powder, whose quality is 16% to 63% of the total. Then add to the mixture 0.2-0.5% dispersant of stearic natrium acid. Using dry milling to make it alloyed and form amorphous fine crystal powder. A great deal of nitrogen is adsorbed in the surface of the titanium. Dry the alloyed amorphous powder for 4 to 5 hours in a temperature of 70-80 degree centigrade. Put the dry powder in a graphite mould, and sintering for 1.5 to 2.5 hours in the condition of argon or vacuum, while keeping the temperature at 950 to 1200 degree centigrade, the pressure at 10 to 35MPa. The invention uses Ti powder, Al powder, and a little additive and to be milled in high-energy ball milling, the resultant is amorphous, then, suffer situ reaction to make a refinement or even nanometer Ti2AlN enhanced phase to enhance the mechanical strength and toughness of base phase TiAl. So the comprehensive performance of this material is improved.

Description

technical field [0001] The invention relates to a preparation method of a TiAl intermetallic compound composite material, in particular to a TiAl / Ti 2 A method for preparing an AlN intermetallic compound composite material. Background technique [0002] Intermetallic compounds, especially TiAl intermetallic compounds, have excellent high-temperature specific properties (strength, toughness, environmental resistance, etc.), and have become one of the hot spots in the development of high-temperature structural materials. However, due to its brittleness at room temperature, difficulty in deformation processing and insufficient oxidation resistance above 850 °C, the practical application of this alloy is seriously hindered. Ceramic particles reinforced TiAl-based composites are an effective way to overcome the above defects, but if the particle size of the ceramic particles is relatively coarse, a high amount of ceramic phase is introduced to strengthen the TiAl matrix while sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/14
Inventor 朱建锋王芬高积强杨海波
Owner SHAANXI UNIV OF SCI & TECH
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