Process for producing composite material of Ti3SiC2 modified C/SiC

A composite material and modification technology, applied in the field of preparation of modified C/SiC composite materials, can solve the problems of low use temperature and poor toughness, and achieve the effect of avoiding agglomeration

Inactive Publication Date: 2009-08-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of low service temperature and poor toughness of the C / SiC composite material prepared by the prior art MI method due to the enrichment of a large amount of residual silicon, the present invention provides a Ti 3 SiC 2 The preparation method of modified C / SiC composite material adopts slurry infiltration (hereinafter referred to as SI method) combined with MI method to prepare Ti 3 SiC 2 To modify the C / SiC composite material, introduce TiC particles into the porous C / C or C / SiC composite material by the SI method, and then introduce Si into the composite material by the MI method, and Si reacts with TiC to form Ti 3 SiC 2 and SiC, the residual silicon in C / SiC composites is mostly replaced by Ti 3 SiC 2 Replacement, can improve the service temperature and toughness of C / SiC composites

Method used

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  • Process for producing composite material of Ti3SiC2 modified C/SiC
  • Process for producing composite material of Ti3SiC2 modified C/SiC
  • Process for producing composite material of Ti3SiC2 modified C/SiC

Examples

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Embodiment 1

[0019] Example 1: Select a three-dimensional needle-punched porous C / C composite material as a prefabricated body, and its density is 1.3g / cm 3 , with an open porosity of 35vol.%, ultrasonically cleaned and dried for later use. Add 1.5g of sodium carboxymethyl cellulose and 150g of TiC powder with a particle size of 1μm to 300g of distilled water at a temperature of 50°C, stir evenly, pour into a ball mill jar, and add a total weight of 903g of corundum balls with a particle size of 5 to 12mm Ball milled for 10 hours to make slurry. Slurry impregnation adopts vacuum impregnation combined with pressure infiltration. Put the open container with the slurry and the three-dimensional needle-punched C / C composite material prefabricated body into the airtight container respectively, and evacuate to keep the absolute pressure of the airtight container at 5.0×10 2 Pa, then submerge the preform in the slurry and continue vacuuming; when the absolute pressure in the container is 5.0×10...

Embodiment 2

[0020] Example 2: Select a two-dimensional needle-punched porous C / C composite material as a preform, and its density is 1.5g / cm 3, with an open porosity of 23vol.%, ultrasonically cleaned and dried for later use. Add 3g of sodium carboxymethyl cellulose and 300g of TiC powder with a particle size of 2μm to 300g of distilled water at a temperature of 60°C, stir evenly, pour into a ball mill jar, add 603g of corundum balls with a particle size of 5 to 12mm in total weight for ball milling 5h to make slurry. Slurry impregnation adopts vacuum impregnation combined with pressure infiltration. Put the open container with the slurry and the two-dimensional needle-punched C / C composite prefabricated body into the airtight container respectively, and vacuumize to keep the absolute pressure in the airtight container at 1.0×10 3 Pa, then submerge the prefabricated body in the slurry and continue vacuuming; when the absolute pressure in the container is 1.0×10 3 At Pa, air is introduc...

Embodiment 3

[0021] Example 3: Select a three-dimensional needle-punched porous C / C composite material as a prefabricated body, and its density is 1.49g / cm 3 , with an open porosity of 24vol.%, ultrasonically cleaned and dried for later use. Add 2.5g of sodium carboxymethyl cellulose and 250g of TiC powder with a particle size of 0.4μm to 300g of distilled water at a temperature of 70°C, stir well and pour it into a ball mill jar, and add a total weight of 1657g of corundum with a particle size of 5 to 12mm Ball milled for 30h to make slurry. Slurry impregnation adopts vacuum impregnation combined with pressure infiltration. Put the open container with the slurry and the three-dimensional needle-punched C / C composite material prefabricated body into the airtight container respectively, and vacuumize to keep the absolute pressure in the airtight container at 2.0×10 3 Pa, then submerge the preform in the slurry and continue vacuuming; when the absolute pressure in the container is 2.0×10 ...

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Abstract

The invention discloses a method for preparing Ti3SiC2 modified C / SiC composite material, comprising the following steps: firstly, carrying out ultrasonic cleaning and drying on the pre-prepared body to be modified; compounding the size with distilled water, cellulose sodium carboxy methyl and TiC powder; then carrying out vacuum infiltration combined with pressure infiltration on the pre-prepared body and refrigeration and drying in vacuum; coating industrial silicon powder on the surface of the pre-prepared body; calcining the pre-prepared body in a vacuum furnace to lead the silicon to fuse to penetrate into the pre-prepared body; and cooling the pre-prepared body gradually to room temperature after full reaction in the vacuum furnace. As SI method is adopted to lead C / C or C / SiC composite material to be firstly internally filled with TiC granules, then MI method is adopted to penetrate silicon fusant, and TiC reacts with Si to generate Ti3SiC2 and SiC, the content of residue Si in the composite material is reduced, and the Ti3SiC2 phase in-situ generated in the C / SiC composite material causes the use temperature of the modified C / SiC composite material to rise from 1420 DEG C in the prior art to 1500-2300 DEG C and the fracture toughness property to rise from 8MPa.m in the prior art to 9-16 MPa.m.

Description

technical field [0001] The present invention relates to a kind of preparation method of modified C / SiC composite material, especially Ti 3 SiC 2 The preparation method of the modified C / SiC composite material. Background technique [0002] Document 1 "S.W.Fan, Y.D.Xu, L.T.Zhang, L.F.Cheng, LYuand Y.D.Yuan et al., Three-dimensional neededled carbon / silicon carbide composites with high friction performance, Mater.Sci.Eng.A 467(2007)53-58. " discloses a method for preparing C / SiC composite materials, which uses silicon melt infiltration technology (hereinafter referred to as MI method) to infiltrate Si melt into porous three-dimensional needle-punched carbon / carbon composite materials, Si melt and C / SiC C reacts to form a SiC matrix, forming a dense C / SiC composite. However, due to the large pores and cracks inside the porous C / C composite material, a large amount of residual silicon will be enriched after liquid silicon infiltrates, and the residual silicon content is great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/565C04B35/80C04B35/622
CPCC04B35/573C04B35/6261C04B35/62655C04B35/80C04B2235/3843C04B2235/5248C04B2235/608C04B2235/616C04B2235/6562C04B2235/6565C04B2235/6581C04B2235/661C04B2235/80
Inventor 殷小玮张立同成来飞何珊珊范尚武刘永胜
Owner NORTHWESTERN POLYTECHNICAL UNIV
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