TiC/SiC/Al composite material

A technology of composite materials and composite layers, which is applied in the field of ceramic matrix composite materials, can solve the problems that cannot be applied to large-scale industrial production, and achieve the effects of reduced production costs, good fluidity, and increased penetration rate

Inactive Publication Date: 2018-05-18
HEBEI UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

The results show that the prepared composite material has excellent mechanical properties (compared with single SiC and TiC materials), and the fracture toughness and room temperature flexural strength can reach 6MPam respectively. 1 / 2 and 750MPa, but its preparation process needs to be completed under high temperature and high pressure, which obviously cannot be applied to large-scale industrial production

Method used

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  • TiC/SiC/Al composite material
  • TiC/SiC/Al composite material
  • TiC/SiC/Al composite material

Examples

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preparation example Construction

[0020] The TiC / SiC / Al composite material of the present invention, the outer layer of the composite material is a TiC reaction layer, and the inside is a SiC / Al composite layer, and the preparation method of the composite material comprises the following steps:

[0021] (1) Preparation of aluminum alloy: the mass percentage of each element in the aluminum alloy is: Al, 50-90wt.%; Ti, 5-20wt.%; Si, 5-30wt.%; Take the corresponding raw materials, grind the pure aluminum ingot with a grinding wheel, remove the surface oxide skin, place it together with pure titanium and silicon blocks in a graphite crucible, raise the temperature to 800-1200°C in a vacuum melting furnace, keep it warm for 0.5-3h, and keep stirring during the process After cooling, an aluminum alloy with uniform composition can be obtained.

[0022] (2) Pretreatment of SiC ceramics: Cut the SiC ceramics into the required corresponding size with a diamond cutting machine; then use an 800-mesh diamond grinding disc ...

Embodiment 1

[0027] The TiC / SiC / Al composite material of this embodiment, the outer layer of the composite material is a TiC reaction layer, and the inner layer is a SiC / Al composite layer. The preparation method of the composite material includes the following steps:

[0028] (1) Preparation of aluminum alloy: the mass percentage of each element in the aluminum alloy is: Al, 80wt.%; Ti, 10wt.%; Si, 10wt.%; 80g, titanium ingot 10g, silicon block 10g. Place all the above-mentioned raw materials in an alumina crucible at one time, put it in a vacuum stirring melting furnace and raise the temperature to 900°C at a heating rate of 10°C / min, and keep it warm for 1.5h, stirring continuously during this period to promote the homogenization of the ingredients, and take it out after solidification .

[0029] (2) Pretreatment of SiC ceramics: use a diamond cutter to cut SiC ceramics into a size of 40mm×5mm×5mm; then use 240 mesh and 800 mesh diamond discs to polish the surface of SiC ceramics until...

Embodiment 2

[0037] The specific preparation method of the TiC / SiC / Al composite material in this example is the same as in Example 1, except that the mass percentages of the elements in the aluminum alloy in this example are: Al, 85wt.%; Ti, 5wt.%; Si , 10wt.%.

[0038] According to the test and analysis process of Example 1, the composite material obtained in this embodiment is analyzed and tested, and the specific results are: through the fracture toughness test, the average fracture toughness of the composite material obtained in this embodiment is 4.1MPam 1 / 2 , compared to pristine SiC ceramics (2.2MPam 1 / 2 ) increased by 1.9MPam 1 / 2 ; After the three-point bending strength test, the average bending strength of the composite material prepared in this embodiment is 289MPa, which is 110MPa higher than that of the original SiC ceramic (179MPa).

[0039] The preparation method of this example can obtain TiC / SiC / Al composite material, and when the impregnation time is 4h, Al can be comple...

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Abstract

The invention relates to a TiC / SiC / Al composite material. An outer layer of the TiC / SiC / Al composite material is a TiC reaction layer, and the interior of the TiC / SiC / Al composite material is a SiC / Alcomposite layer. A preparation method of the composite material comprises the following steps of (1) preparation of an aluminum alloy, specifically, the aluminum alloy comprises the elements of, by mass, 50-90% of Al, 5-20% of Ti and 5-30% of Si; (2) pretreatment of SiC ceramic; (3) reaction infiltration process, specifically, the aluminum alloy prepared in the step (1) is smelted in a box-type furnace to obtain aluminum alloy liquid, the SiC ceramic processed in the step (2) is immersed into the aluminum alloy liquid and put into the box-type furnace for heat preservation, the infiltrating temperature is1150-1200 DEG C, the infiltrating time is 0.5-8 h, a sample is taken out and cooled to room temperature to obtain the TiC / SiC / Al composite material. The TiC / SiC / Al composite material hasgood fracture toughness under the premise of ensuring bending strength, and the preparation process is simple, and the TiC / SiC / Al composite material is suitable for large-scale industrialized production.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite materials, and in particular relates to a TiC / SiC / Al composite material. Background technique [0002] With the development of various strategic fields such as construction, transportation, and energy storage, there is an urgent need for new high-performance structural materials with well-matched strength and toughness. SiC ceramics can meet this requirement due to their good thermal and chemical stability, corrosion resistance and high strength; however, due to their poor toughness, the wide application of this material is limited. In order to improve the toughness of SiC, people usually add a certain proportion of metals such as aluminum alloy to it to make ceramic-metal composites (CMCs), which can be widely used in electronic packaging, automotive, defense and aerospace and other fields. In recent years, the main manufacturing methods of SiC / Al composite materials are powder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10
CPCC22C1/1036C22C1/1057
Inventor 崔亚奇马瑞娜杜安王威曹晓明武建军
Owner HEBEI UNIV OF TECH
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