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A kind of preparation method of complex bicontinuous phase sic/si composite material

A bicontinuous phase and composite material technology, which is applied in the field of preparation of duplex bicontinuous phase SiC/Si composite materials, can solve the problems of low product strength and reinforcement strength, and achieve the effect of simple process

Active Publication Date: 2018-04-20
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

Patent CN1896171 uses porous SiC ceramics prepared by organic precursor impregnation method as a reinforcement to prepare a composite material. As a new type of high-performance friction braking material, the product has broad application prospects in the braking system of modern vehicles, but there are reinforcements The strength is not high; the patent CN103710561A adopts the method of powder pouring and compaction and then high-temperature melting to prepare a composite dual-continuous phase SiC / M composite material. By changing the metal phase composition and porous ceramic material, different reinforcements and metal phase composite materials can be realized. Disadvantages It is its unique metal composite method that causes a large number of pores in the composite material, and it is only suitable for the preparation of composite materials using high-porosity reinforcements; patent CN102962434A directly adopts the distribution characteristics described in patent CN101323524 by using the furnace temperature axial gradient method. Oriented porous SiC ceramics are used as reinforcements, and the vacuum infiltration process has prepared a composite dual-continuous phase SiC / CuSi composite material. The preparation process is simple, the cost is low, and composite materials of various complex shapes can be produced. There is also a problem of low product strength. question

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  • A kind of preparation method of complex bicontinuous phase sic/si composite material
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preparation example Construction

[0029] A kind of preparation method of composite bicontinuous phase SiC / Si composite material, comprises the following steps:

[0030] Step 1: using SiC powder with an average particle size of 6 microns as the main raw material, adding 5-30 wt.% silicon powder with a particle size of 240-400 mesh as a pore-forming agent to obtain a mixture A, adding alcohol, the mass ratio of mixture A and alcohol is 1:3, then use planetary ball mill to mix materials for 4~6 hours, after mixing, use rotary evaporator to dry to obtain mixture B. Rotary evaporator can effectively avoid the sedimentation velocity caused by different particles due to density difference in the general static drying process This leads to powder layering and uneven mixing;

[0031] Step 2: Add an appropriate amount of PVA (polyvinyl alcohol) aqueous solution to the mixture B, the quality of the PVA aqueous solution accounts for 3-6% of the total mass of the mixture B and the PVA aqueous solution, wherein the mass fra...

Embodiment 1

[0035] Step 1: Using SiC powder with an average particle size of 6 microns as the main raw material, add 5wt.% silicon powder with a particle size of 240 mesh as a pore-forming agent to obtain a mixture A, add alcohol, the mass ratio of mixture A and alcohol is 1:3, Subsequently, a ball mill was used for mixing for 4 hours, and after the mixing was completed, a rotary evaporator was used to dry to obtain a mixture B;

[0036]Step 2: Add an appropriate amount of PVA aqueous solution to the mixture B. The quality of the PVA aqueous solution accounts for 3% of the total mass of the mixture B and the PVA aqueous solution. Wherein, the mass fraction of PVA in the PVA aqueous solution is 5%. Mix and pass through a 120-mesh sieve for granulation ; followed by dry pressing to obtain a green body with a size of approximately 50mm×5mm×5mm. The forming pressure is 4 tons. The green body is put into a drying oven for drying. The drying condition is 100°C for 8 hours. The intermediate freq...

Embodiment 2

[0039] Step 1: Use SiC powder with an average particle size of 6 microns as the main raw material, add 10wt.% silicon powder with a particle size of 400 mesh as a pore-forming agent to obtain a mixture A, add alcohol, the mass ratio of mixture A and alcohol is 1:3, Subsequently, a ball mill was used for mixing for 6 hours, and after the mixing was completed, a rotary evaporator was used to dry to obtain a mixture B;

[0040] Step 2: Add an appropriate amount of PVA aqueous solution to the mixture B. The quality of the PVA aqueous solution accounts for 6% of the total mass of the mixture B and the PVA aqueous solution. Wherein, the mass fraction of PVA in the PVA aqueous solution is 8%. Mix and pass through a 120-mesh sieve for granulation ; followed by dry pressing to obtain a green body with a size of approximately 50mm×5mm×5mm, with a molding pressure of 6 tons; the green body was put into a drying oven for drying, and the drying condition was 150°C for 16 hours, and then the...

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Abstract

The invention discloses a preparation method of a complex bicontinuous phase SiC / Si composite material. Firstly, the raw materials of iron oxide and SiC are wet-mixed according to different iron oxide additions, and then dried by a rotary evaporator; the dried powder is added to PVA for granulation, and then sintered after dry pressing to obtain different porosity Oriented Porous Ceramics. Then, the obtained oriented porous SiC ceramics were used as reinforcements, and the composite bicontinuous phase SiC / Si composites were prepared by vacuum infiltration process. In the present invention, iron oxide is used as a pore-forming agent to prepare directional porous ceramics, which are pure SiC ceramics, which have structural directional distribution characteristics, relatively excellent high-temperature performance, high pore rib density and flexural strength, and thus the final prepared composite bicontinuous phase SiC The higher pore density and flexural strength of the / Si composite material are much better than the SiC / Si composite material prepared by the reaction sintering method used in armor materials, and have a good application prospect.

Description

technical field [0001] The invention belongs to the field of SiC / Si composite material preparation, and in particular relates to a method for preparing a compound bicontinuous phase SiC / Si composite material. Background technique [0002] Duplex bicontinuous phase SiC / Metal composite material is a kind of composite material obtained by using porous SiC ceramics as reinforcement through metal infiltration process. It is widely used in wear-resistant and acid-alkaline environments, electronic packaging materials, protective armor, etc. field. The key step in the preparation process of composite bicontinuous SiC / M composites is the preparation of oriented porous SiC ceramic reinforcements. Patent CN1896171 uses porous SiC ceramics prepared by organic precursor impregnation method as a reinforcement to prepare a composite material. As a new type of high-performance friction braking material, the product has broad application prospects in the braking system of modern vehicles, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B38/06
Inventor 白建光殷海荣马明鑫陈国平乔荫颇唐元元张攀李艳肖
Owner SHAANXI UNIV OF SCI & TECH
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