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Preparation of titanium-aluminum compound based composite material

A titanium-aluminum compound and composite material technology, applied in the field of material science, can solve the problems of low plasticity at room temperature, increase fiber damage, difficult plastic processing materials, etc., achieve great economic and social value, reduce thermal stress cracks, and reduce preparation temperature. Effect

Inactive Publication Date: 2009-07-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the room temperature plasticity of TiAl-based alloys is very low, and it is an extremely difficult plastic processing material.
Usually, in the temperature range below 700°C, its plasticity is very poor, and its elongation is generally only 2% to 3%, so it cannot be processed plastically.
At a high temperature greater than 1100°C, although its plasticity has improved, its deformation resistance is still very large, and its flow stress is generally as high as 200MPa, and it is required to maintain a relatively low strain rate (1×10 -3 l / s), so it is very difficult to plastically form it,
Therefore, when preparing SiC fiber-reinforced TiAl compound-based composites by vacuum diffusion bonding, high temperature and pressure are required, which increases the degree of interface reaction between the fiber and the matrix, produces a brittle phase, and also increases the damage of the fiber. degrade the properties of the composite

Method used

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  • Preparation of titanium-aluminum compound based composite material
  • Preparation of titanium-aluminum compound based composite material
  • Preparation of titanium-aluminum compound based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using the magnetron sputtering method to alternately sputter Ti films and Al films with a thickness of about 1 μm on SiC fibers, and prepare SiC composite wires with Ti and Al films stacked multiple times, such as figure 1 , 2 shown.

[0030] The preparation of composite materials is divided into two parts: the preparation of composite wires and the pressing of sheets. The composite wire is prepared by a double-target magnetron sputtering apparatus. First, the SiC fiber is wound on a special runner frame in parallel at a certain distance using a winding unit, and then the runner is loaded into the vacuum chamber of the magnetron sputtering apparatus. Two pairs of targets are installed with pure Ti and pure Al respectively, and the Ti film and Al film are sputtered on the surface of the SiC fiber in different time periods. When pressed, the interface reacts to form needle-like or flake-like Al 4 C 3 , and the good high-temperature deformation and diffusion ability of...

Embodiment 2

[0037] Example 2: Use the magnetron sputtering method to alternately sputter a Ti film and an Al film with a thickness of about 2 μm on the SiC fiber to prepare a SiC composite wire with multiple stacked Ti and Al films, seal it in a sheath and vacuumize it, and use The matrix coating fiber method is hot-pressed in a hot isostatic pressing furnace. The specific process is 600°C / 100MPa / 2h, and heat treatment at 800°C for 4 hours after taking it out.

[0038] For other technical details of this embodiment, refer to the content of Embodiment 1.

Embodiment 3

[0039] Example 3: Using the magnetron sputtering method to alternately sputter a Ti film with a thickness of about 1 μm and an Al film with a thickness of 3 μm on the SiC fiber, and use the matrix coating fiber method to form by quasi-isostatic hot pressing to prepare TiAl 3 The specific process is 600°C / 80MPa / 2h, +800°C / 80MPa / 4h.

[0040] In this embodiment, the volume ratio of Ti and Al is 1:3. For other technical details of this embodiment, refer to the content of Embodiment 1.

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Abstract

The invention provides a method for preparing a titanium aluminum compound base composite material, which is characterized by comprising: firstly, alternatively depositing a simple substance layer Ti and a simple substance layer Al on the external surface of SiC fiber; and secondly, performing pressing by adopting vacuum heat pressing or hot isostatic pressing at a certain temperature, and forming a composite material by diffusion bonding. The method effectively reduces the preparation temperature of the Ti-Al compound base composite material, remarkably reduces the thermal stress crack caused by the difference between the coefficients of thermal expansion in the process of cooling a basal body, and ensures that the interface reaction between the basal body and the fiber is controlled well. The method has great expected economical values and social values.

Description

technical field [0001] The invention relates to material science, and particularly provides a method for preparing a titanium-aluminum compound-based composite material. Background technique [0002] In the prior art, in recent years, in the related research on SiC fiber (CVD) and other reinforced metal matrix composite materials, TiAl intermetallic compound has received extensive attention due to its superior high temperature performance. [0003] Compared with Ti alloys, reinforced metal matrix composites such as SiC fibers (CVD) have lower density, higher high-temperature strength, and excellent oxidation resistance. These characteristics enable it to better meet the needs of working at high temperatures. The working temperature of Ti alloy-based composite materials is below 600 °C, while that of TiAl compound-based materials can be raised to above 700 °C, which will greatly improve the design space of aircraft engines and the like. However, the room temperature plastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/18C23C14/35B22F3/02
Inventor 冀鸰王玉敏石南林杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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