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a ti 3 sic 2 -al 2 o 3 -sic-al composite material and preparation method thereof

A technology of ti3sic2-al2o3-sic-al and composite materials, which is applied in the field of Ti3SiC2-Al2O3-SiC-Al composite materials and their preparation, can solve the problem of poor surface wear resistance, low hardness, and poor anti-friction and wear resistance of composite materials. question

Active Publication Date: 2021-07-06
HEBEI UNIV OF TECH
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  • Description
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Problems solved by technology

[0005] Chinese patent application number 201711365973.5 "a kind of Ti 3 SiC 2 / SiC / Al composite material preparation method", prepared Ti 3 SiC 2 / SiC / Al, but there is residual aluminum in the surface gap. After the aluminum alloy is infiltrated into the SiC matrix, after the surface polishing of the resulting composite material, the Ti on the surface of the sample 3 SiC 2 There is still a certain amount of aluminum in the gap with SiC, Al belongs to the soft phase, low hardness, poor friction and wear resistance, although there is a lubricating phase Ti 3 SiC 2 However, due to the low overall hardness of the surface layer, the average Vickers hardness is about 580Hv, the wear resistance of the composite material surface is extremely poor, which seriously affects its wear resistance

Method used

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  • a ti <sub>3</sub> sic <sub>2</sub> -al <sub>2</sub> o <sub>3</sub> -sic-al composite material and preparation method thereof
  • a ti <sub>3</sub> sic <sub>2</sub> -al <sub>2</sub> o <sub>3</sub> -sic-al composite material and preparation method thereof
  • a ti <sub>3</sub> sic <sub>2</sub> -al <sub>2</sub> o <sub>3</sub> -sic-al composite material and preparation method thereof

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preparation example Construction

[0031] Ti of the present invention 3 SiC 2 -Al 2 o 3 -The preparation method of SiC-Al composite material, this method comprises the steps:

[0032] 1) Preparation of Al-based alloy: the mass percentage of each element of Al-based alloy is: Al, 45-90wt.%; Ti, 3-25wt.%; Mg, 1-6wt.%; Si, 5-30wt.%;

[0033] Weigh the corresponding raw materials according to the mass percentage of the above elements, put the pure aluminum ingot into 0.5mol / L NaOH solution, after 1-3 hours, after the surface oxide skin is completely removed, put it in a graphite crucible, and then put the titanium ingot, Place magnesium powder and silicon blocks together in a graphite crucible, then place the graphite crucible in an energy-saving box-type resistance furnace model SX-G04132 to heat up to 700-1100°C for melting, keep it warm for 0.5-4h, and stir until completely dissolved , that is, the Al-based alloy liquid in molten state is obtained;

[0034] 2) Treatment of SiC ceramics: Cut the SiC ceramic ...

Embodiment 1

[0041] This embodiment Ti 3 SiC 2 -Al 2 o 3 The preparation method of the -SiC-Al composite material is as follows:

[0042] 1) Preparation of aluminum-based alloy: the mass percentage of each element of the aluminum-based alloy is composed of: Al, 78wt%; Ti, 10wt%; Mg, 2wt%; Si, 10wt%;

[0043] Weigh the corresponding raw materials according to the above-mentioned mass percentages of each element, and each raw material is respectively Al ingot (purity 99.9%), Ti ingot (purity 99.9%), Mg powder (purity 99.9%), Si block (purity 99.5%), pure aluminum Put the ingot into the NaOH solution of 0.5mol / L. After 2 hours, after the surface oxide skin is completely removed, take 156gAl ingot and place it in a graphite crucible, then put 20gTi, 20gSi, and 4gMg in the graphite crucible together, and place the graphite crucible In an energy-saving box-type resistance furnace model SX-G04132, the temperature was raised to 800°C with a heating rate of 20°C / min, kept at this temperature fo...

Embodiment 2

[0051] This embodiment Ti 3 SiC 2 The specific steps of the preparation method of the / SiC / Al composite material are the same as in Example 1, except that the mass percentage of each element of the aluminum-based alloy consists of: Al, 83wt%; Ti, 5wt%; Mg, 2wt%; Si, 10wt% %.

[0052] According to the test and analysis process of embodiment 1, the composite material obtained in this embodiment is analyzed and tested, and the specific result is: through the fracture toughness test, the average fracture toughness of the composite material obtained in this embodiment is 4.3MPam 1 / 2 , compared to pristine SiC ceramics (2.2MPam 1 / 2 ) increased by 2.1MPam 1 / 2 ; Under the same conditions, the friction and wear performance test is carried out, and the average friction coefficient of the measured material is 0.45, and the average wear rate is 4.2×10 -3 mm 3 / min, compared to original SiC ceramics (friction coefficient 0.55, wear rate 5×10 -3 mm 3 / min), the friction coefficient i...

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Abstract

The present invention is a kind of Ti 3 SiC 2 ‑Al 2 o 3 ‑SiC‑Al composite materials and methods for their preparation. The outer layer of the composite material is Ti 3 SiC 2 / Al 2 o 3 / SiC reaction layer, the interior is SiC / Al composite material; the thickness of the reaction layer is 100-400 μm. In the outer layer of the composite material, the volume percentage Ti 3 SiC 2 : 60~80%, Al 2 o 3 : 15% to 40%, SiC: 5% to 20%. The method first obtains Ti by reactive infiltration 3 SiC 2 / SiC / Al composite material, and then through a one-step in-situ oxidation treatment process, by controlling the oxidation process parameters (oxidation temperature and oxidation time), the outer surface Ti 3 SiC 2 In situ oxidation with Al in the interstitial space of SiC to generate Al 2 o 3 , so that the surface layer becomes Ti 3 SiC 2 / Al 2 o 3 / SiC. The composite material prepared by the invention has strong toughness and good friction and wear properties.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite materials, in particular to a Ti 3 SiC 2 -Al 2 o 3 - SiC-Al composite material and preparation method thereof. Background technique [0002] SiC ceramics are widely used in high-efficiency high-speed cutting tools, space technology, key components of engines, sealing components, new energy development and other new types due to their light weight, high strength, good thermal conductivity, low expansion coefficient, high hardness, excellent thermal and mechanical properties, etc. industry. However, like other ceramic materials, SiC ceramic materials themselves have a high friction coefficient and wear rate. It is a brittle material with low fracture toughness. During sliding friction, the critical load of ceramic surface fracture is much lower than that under static conditions. In addition, during the friction process, the friction surface produces continuous changes in the lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
CPCC04B41/009C04B41/5155C04B41/85C04B41/5057C04B41/5031C04B41/455C04B41/4523C04B41/0072C04B35/565
Inventor 曹晓明于亚军马瑞娜杜安范永哲赵雪
Owner HEBEI UNIV OF TECH
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