Method for synthesizing Al203/TiAl composite material

A synthesis method and technology of composite materials, applied in the field of preparation of intermetallic compounds/ceramic composite materials, can solve the problems of difficult ceramic phase particle distribution, material performance barriers, difficult to eliminate pores, etc., and achieve uniform, dense and adjustable structure Great, low-cost effect

Inactive Publication Date: 2007-06-27
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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  • Method for synthesizing Al203/TiAl composite material

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Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: at first 64% Ti and 36% Al are made mixture by mass percentage; Add the sodium stearate dispersant of mixture quality 0.5% in the mixture, adopt dry ball milling, make its mechanical alloying, wherein , the rotational speed of the planetary ball mill is 700 rev / min, the mass ratio of material to ball is 1:10, ball milling for 20 hours, and the amorphous fine powder whose main crystal phase is TiAlO is formed; the alloyed amorphous powder is heated at 70°C Dry under high temperature for 5 hours; put the dried powder into a graphite grinding tool, and sinter it under argon at 1200°C and a pressure of 20MPa for 1.5 hours.

Embodiment 2

[0010] Embodiment 2: at first by mass percentage the Al of 56% and the TiO of 44% 2 Make mixture; Add the sodium stearate dispersant of mixture quality 0.2% in mixture, adopt dry ball milling, make its mechanical alloying, wherein, the rotating speed of planetary ball mill is 800 rev / mins, and material ball mass ratio is 1 : 10, ball milled for 24 hours to form an amorphous fine powder whose main crystal phase is TiAlO; the alloyed amorphous powder was dried at 78°C for 4.2 hours; the dried powder was packed into a graphite grinding tool, Under the condition of argon, it can be hot-pressed and sintered at 1000°C and a pressure of 10 MPa for 2.5 hours.

Embodiment 3

[0011] Embodiment 3: first by mass percentage 25% Ti, 40% Al and 35% TiO 2 Make mixture; Add the sodium stearate dispersant of mixture quality 0.4% in mixture, adopt dry method ball mill, make its mechanical alloying, wherein, the rotating speed of planetary ball mill is 780 rev / mins, and material ball mass ratio is 1 : 10, ball milled for 23 hours to form an amorphous fine powder whose main crystal phase is TiAlO; the alloyed amorphous powder was dried at 72°C for 4 hours; the dried powder was packed into a graphite grinding tool, and the Under the condition of argon, it can be hot-pressed and sintered at 1150 ° C and 35 MPa for 1.8 hours.

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Abstract

The invention relates to the compounding method for Al2O3 / TiAl compounding material that the process includes: mixing Ti, Al and TiO2; adding sodium stearate dispersant into the mixture forming non crystal fine particle that the main crystal pase is TiAlO by dry method ball mill; drying and milling the powder; adding the powder into graphite grinding apparatus sintering in the condition of argon or vacuum. The invention has wide application range.

Description

technical field [0001] The present invention relates to a kind of preparation method of intermetallic compound / ceramic composite material, relate to a kind of mechanical alloying synthesis Al 2 o 3 / TiAl composite method. 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 hotspots in the development of high-temperature structural materials. However, room temperature brittleness, difficulty in deformation processing and insufficient oxidation resistance above 850 °C seriously hinder the practical application of this alloy. Ceramic particles reinforced TiAl-based composites are an effective way to overcome the above defects. Al in comparison 2 o 3 Not only is it cheaper, but its thermal expansion coefficient is also the closest to that of the TiAl matrix. The existing preparation methods include...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C45/00C22C45/08C22C45/10
Inventor 朱建锋王芬高积强
Owner SHAANXI UNIV OF SCI & TECH
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