Mo coating SiC fiber-reinforced TiAl-based composite material and preparation method thereof

A fiber-reinforced and composite material technology, applied in the field of magnetron sputtering physical deposition, can solve the problems of hindering interface reaction, fiber strength reduction, matrix tissue embrittlement, etc., to slow down interface reaction, excellent thermal stability, and slow down consumption speed Effect

Inactive Publication Date: 2019-09-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the widely used interface modification coating technology is to coat a layer of C coating on the surface of SiC fibers. The results show that C coating can effectively reduce the damage of fibers during the preparation process, but this coating hinders the interface reaction. The capacity of the TiAl alloy is limited, and it is prone to serious loss at high temperature. In addition, the C element will diffuse into the TiAl alloy matrix in a large amount at high temperature, which will further embrittle the matrix structure and cause the overall performance of the comp

Method used

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  • Mo coating SiC fiber-reinforced TiAl-based composite material and preparation method thereof
  • Mo coating SiC fiber-reinforced TiAl-based composite material and preparation method thereof
  • Mo coating SiC fiber-reinforced TiAl-based composite material and preparation method thereof

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Effect test

Embodiment 1

[0033] (1) Firstly, a direct current electric heating chemical vapor deposition (CVD) device is used to prepare such as figure 2 Pyrolytic C coating 1 shown with a thickness of 2 μm;

[0034] (2) Wrap the C-coated SiC fiber on the rotating cage used for sputtering in the sputtering instrument, and ensure that there is no overlap between the fibers during the winding process. After winding the fiber, put the tumbler into the JGP-560A high-vacuum rectangular target magnetron sputtering apparatus to prepare the Mo coating. The sputtering process parameter is 875W / 0.63Pa / 40min, and the preparation effect is as follows: figure 2 , and the thickness of Mo coating 2 is 1.3 μm. After sputtering, take out the fiber, cut it into 100mm long pieces and store it in vacuum for use;

[0035] (3) Ti whose nominal composition is Ti-21Al-29Nb (at%) 2 AlNb-based alloys were machined with 5 pieces of foil with a length of 50 mm, a width of 10 mm, and a thickness of 300 μm by wire electric disc...

Embodiment 2

[0040] (1) Firstly, a direct current electric heating chemical vapor deposition (CVD) device is used to prepare such as figure 2 Pyrolytic C coating 1 shown with a thickness of 2 μm;

[0041] (2) Wrap the C-coated SiC fiber on the rotating cage used for sputtering in the sputtering instrument, and ensure that there is no overlap between the fibers during the winding process. After winding the fiber, put the tumbler into the JGP-560A high-vacuum rectangular target magnetron sputtering apparatus to prepare the Mo coating. The sputtering process parameter is 875W / 0.63Pa / 40min, and the preparation effect is as follows: figure 2 As shown, and the thickness of Mo coating 2 is 1.3 μm. After sputtering, take out the fiber, cut it into 100mm long pieces and store it in vacuum for use;

[0042] (3) After the sputtering of the Mo coating is completed, take out the Mo metal target, replace the γ-TiAl alloy target with a nominal composition of Ti-43Al-9V (at%), and continue to deposit ...

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Abstract

The invention provides a Mo coating SiC fiber-reinforced TiAl-based composite material and a preparation method thereof. The preparation method comprises the following steps of, first preparing a layer of C coating with the thickness of 2-4 micrometers on the SiC fiber surface through a chemical vapor deposition method; and then preparing a layer of Mo metal coating with the thickness is 0.5-2 micrometers on the SiC fiber surface with the C coating through uniform deposition; and finally preparing the Mo coating SiC fiber-reinforced TiAl-based composite material through a foil-fiber-foil method and a fiber coating method. According to the Mo coating SiC fiber-reinforced TiAl-based composite material, the interface reaction between a fiber and a matrix as well as the consumption speed of the C coating of the fiber at a high temperature are effectively reduced, and the Mo coating has excellent thermal stability, does not get involved in an interface reaction and does not diffuse, so that the thermal residual stress at the interface of the composite material can be effectively relieved.

Description

technical field [0001] The invention relates to a magnetron sputtering physical deposition technology and a preparation technology of a metal-based composite material, which can improve the interfacial performance of the composite material by using a fiber coating. Background technique [0002] Compared with traditional titanium-based composites, SiC fiber-reinforced TiAl-based composites have higher service temperature and better creep resistance, which can further meet the material performance requirements of aerospace components, so SiC fiber-reinforced TiAl-based composites It has received attention from all over the world. [0003] However, during high-temperature preparation and high-temperature service, interfacial reactions will occur between the TiAl matrix and SiC fibers, and compared with traditional titanium alloys, the TiAl-based alloy matrix with poor plasticity is more prone to cracking under the action of thermal residual stress, thus worsen the mechanical p...

Claims

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Application Information

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IPC IPC(8): C22C47/04C22C47/20C22C49/12C22C49/14C22C101/14
CPCC22C47/04C22C47/20C22C49/14C22C49/12
Inventor 罗贤杨延清王友其朱玉然
Owner NORTHWESTERN POLYTECHNICAL UNIV
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