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Preparation method of chopped fiber reinforced ceramic matrix composite material

A composite material and chopped fiber technology, which is applied in the field of preparation of chopped fiber reinforced ceramic matrix composites, can solve problems such as fracture and application obstruction, and achieve the effects of avoiding performance degradation, short holding time, and low-cost performance

Pending Publication Date: 2022-02-01
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, due to the intrinsic brittleness of ceramic materials, the complete brittle fracture exhibited when they are subjected to a huge impact hinders their application.
However, there is currently no chopped SiC fiber reinforced Ti 3 SiC 2 related reports

Method used

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  • Preparation method of chopped fiber reinforced ceramic matrix composite material
  • Preparation method of chopped fiber reinforced ceramic matrix composite material
  • Preparation method of chopped fiber reinforced ceramic matrix composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, the Ti with a particle size of 50 μm was weighed 3 SiC 2 Put 50 g of powder into an agate ball mill jar, and use absolute ethanol as a medium for wet ball milling for 18 hours to obtain a fine and uniform powder slurry. Weigh 3.31 g of chopped silicon carbide fibers (the diameter of the chopped silicon carbide fibers is 10-15 μm, and the length is ˜10 mm) and place them in the above-mentioned agate ball mill jar, and continue the ball milling for 4 hours. Subsequently, it is placed in an oven at 60°C until it is dried, and passed through a 80-mesh sieve to obtain SiC f / Ti 3 SiC 2 Mix powder. Then, the mixed powder was put into a graphite mold with an inner diameter of 40mm, cold-pressed at a pressure of 20MPa, and kept under pressure for 8 minutes. Then, vacuum sinter the mold containing the shaped green body in an SPS sintering furnace, heat it up to 1250°C at a heating rate of 40°C / min, and at the same time, gradually increase the pressure to 40...

Embodiment 2

[0037] In this example, the Ti with a particle size of 50 μm was weighed 3 SiC 2 Put 60 g of powder into an agate ball mill jar, and use absolute ethanol as a medium for wet ball milling for 20 hours to obtain a fine and uniform powder slurry. Weigh 3.97g of chopped silicon carbide fibers (the diameter of the chopped silicon carbide fibers is 10-15 μm, and the length is 10 mm) and place them in the above-mentioned agate ball mill jar, and continue the ball milling for 4 hours. Subsequently, it is placed in an oven at 60°C until it is dried, and passed through a 80-mesh sieve to obtain SiC f / Ti 3 SiC 2 Mix powder. Next, the mixed powder was put into a graphite mold with an inner diameter of 40mm, cold-pressed at a pressure of 25MPa, and kept under pressure for 5 minutes. Then, vacuum sinter the mold containing the shaped green body in an SPS sintering furnace, heat it to 1250 °C at a heating rate of 50 °C / min, keep it for 10 min, and gradually increase the pressure to 40 ...

Embodiment 3

[0041] In this example, the Ti with a particle size of 50 μm was weighed 3 SiC 2 Put 50 g of powder into an agate ball mill jar, and use absolute ethanol as a medium for wet ball milling for 20 hours to obtain a fine and uniform powder slurry. Weigh 7.45 g of chopped silicon carbide fibers (the diameter of the chopped silicon carbide fibers is 10-15 μm, and the length is ˜10 mm) and place them in the above-mentioned agate ball mill jar, and continue the ball milling for 4 hours. Subsequently, it is placed in an oven at 60°C until it is dried, and passed through a 80-mesh sieve to obtain SiC f / Ti 3 SiC 2 Mix powder. Next, the mixed powder was put into a graphite mold with an inner diameter of 40 mm, cold-pressed at a pressure of 25 MPa, and kept under pressure for 10 min. Then, vacuum sinter the mold containing the shaped green body in an SPS sintering furnace, heat it to 1250 °C at a heating rate of 40 °C / min, keep it for 10 min, and gradually increase the pressure to 40...

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Abstract

The invention relates to a preparation method of a chopped fiber reinforced ceramic matrix composite material, and belongs to the technical field of composite material preparation. The method comprises the following steps: (1) putting Ti3SiC2 powder into an agate ball milling tank, and carrying out wet ball milling by taking absolute ethyl alcohol as a medium to obtain fine and uniform powder slurry; (2) dispersing chopped silicon carbide fibers into the slurry, continuously ball-milling, uniformly mixing the mixture, drying the mixture into a drying oven at 50-70 DEG C, sieving the mixture by a 80-mesh sieve to obtain SiCf / Ti3SiC2 mixed powder, and putting the mixed powder into a graphite mold for cold press molding; (3) putting the formed green body and the graphite mold into a discharge plasma sintering furnace, heating the green body to 1100-1300 DEG C in vacuum, and sintering the green body for 5-20 minutes by applying pressure of 30-50 MPa to obtain the SiCf / Ti3SiC2 ceramic composite material. The ceramic composite material is low in sintering preparation temperature, short in heat preservation time and excellent in mechanical property. In addition, the method has the advantages of simple preparation process flow, short preparation period and the like.

Description

technical field [0001] The invention relates to a method for preparing a chopped fiber reinforced ceramic matrix composite material, belonging to the technical field of composite material preparation. Background technique [0002] In recent years, a Ti 3 SiC 2 The representative ternary metal compound MAX phase has received extensive attention, in which: M is a transition metal element; A is a main group element (mainly IIIA and IVA group elements); X is a C or N element. The unit cell of the MAX phase consists of M n+ 1 x n Units and A atomic planes are alternately stacked, n=1, 2, 3, corresponding to phases 211, 312, and 413 respectively. There are about 70 kinds of MAX phases synthesized so far. Its unique nano-layer crystal structure endows it with special chemical bond characteristics, so that this type of ceramic material has the excellent characteristics of both metal materials and ceramic materials, such as low density of metal, good electrical / thermal conductiv...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/80C04B35/622C04B35/645C04B35/626
CPCC04B35/5615C04B35/622C04B35/645C04B35/6261C04B2235/5244C04B2235/526C04B2235/5264C04B2235/6581C04B2235/6562C04B2235/6567C04B2235/666C04B2235/77C04B2235/96
Inventor 徐敬军何光起李美栓钱余海左君
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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