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Method for preparing SiC/Ti3SiC2 with substitution reaction hot press in situ

An in-situ and reaction technology is applied in the field of preparing silicon carbide SiC reinforced silicon carbide titanium Ti3SiC2 ceramic matrix composite materials to achieve the effect of inhibiting the formation of TiC, fine particle size, and uniform microstructure refinement

Inactive Publication Date: 2008-09-24
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite material prepared by this invention not only reduces the cost of the material, but also effectively solves the problem of TiC impurity phase in the composite material by adding an appropriate amount of Al

Method used

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  • Method for preparing SiC/Ti3SiC2 with substitution reaction hot press in situ
  • Method for preparing SiC/Ti3SiC2 with substitution reaction hot press in situ
  • Method for preparing SiC/Ti3SiC2 with substitution reaction hot press in situ

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) According to the molar ratio of Si:TiC:Al=2:3:0.2, weigh 11.65 grams of Si powder, 37.23 grams of TiC powder, and 1.12 grams of Al powder;

[0027] 2) Put the above-mentioned ingredients and agate balls into the ball mill tank, and place them on the ball mill for mixing for 10 hours;

[0028] 3) Put the uniformly mixed ingredients into the graphite mold, place the graphite mold in a hot-press furnace, and raise the furnace temperature to 1350°C at a heating rate of 30°C / min under an argon protective atmosphere, and at the same time heat the Apply a pressure of 40MPa to the powder and keep it warm for 2 hours. That is, SiC / Ti is produced 3 SiC 2Bulk composites with a SiC content of 10% by weight, Ti 3 SiC 2 The content is 90%. The bending strength of the composite material is ≥500MPa, and the fracture toughness is ≥6MPa m 1 / 2 . The XRD pattern of the material is as figure 1 shown. It can be seen from the figure that only SiC and Ti 3 SiC 2 Diffraction peaks...

Embodiment 2

[0030] 1) According to the molar ratio of Si:TiC:Al=2:3:0.2, weigh 11.65 grams of Si powder, 37.23 grams of TiC powder, and 1.12 grams of Al powder;

[0031] 2) Put the above-mentioned ingredients and agate balls into a ball mill jar, and place them on the ball mill for mixing for 10 hours;

[0032] 3) Put the uniformly mixed ingredients into the graphite mold, place the graphite mold in a hot-press furnace, and raise the temperature of the furnace to 1450°C at a heating rate of 30°C / min under an argon protective atmosphere. Apply a pressure of 40MPa to the powder and keep it warm for 4 hours. That is, SiC / Ti is produced 3 SiC 2 Bulk composites with a SiC content of 10% by weight, Ti 3 SiC 2 The content is 90%. The bending strength of the composite material is ≥500MPa, and the fracture toughness is ≥6MPa m 1 / 2 . Its XRD result and microstructure are identical with embodiment one.

Embodiment 3

[0034] 1) According to the molar ratio of Si:TiC:Al=2:3:0.4, weigh 11.39 grams of Si powder, 36.41 grams of TiC powder, and 2.2 grams of Al powder;

[0035] 2) Put the above-mentioned ingredients and agate balls into a ball mill jar, and place them on the ball mill for mixing for 10 hours;

[0036] 3) Put the uniformly mixed ingredients into the graphite mold, place the graphite mold in a hot-press furnace, and raise the furnace temperature to 1500°C at a heating rate of 40°C / min under an argon protective atmosphere, and at the same time heat the Apply a pressure of 30MPa to the powder and keep it warm for 1 hour. That is, SiC / Ti is produced 3 SiC 2 Bulk composites with a SiC content of 10% by weight, Ti 3 SiC 2 The content is 90%. The bending strength of the composite material is ≥500MPa, and the fracture toughness is ≥6MPa m 1 / 2 . Its XRD result and microstructure are identical with embodiment one.

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Abstract

The present invention provides a composite material SiC / Ti3SiC2 that is synthesized by displacement reaction of original positions, and a hot-pressing preparation method thereof. Si powder and TiC powder are used as raw materials; Al is used as an additive for the reaction; the molar ratio between Si, TiC and Al is equal to 2 to 3 to from 0.2 to 1; after being mixed for 10 hours in a dry way, the mixed materials are arranged in a graphite die that is then arranged in a hot-pressing furnace; with the protection of argon gas, the temperature of the furnace is raised to be between 1350 and 1550 DEG C at the rate of 20 to 50 DEG C per minute; at the same time, the pressure of 20 to 40MPa is exerted in the die; the temperature is maintained for 1 to 4 hours; thus the composite material of SiC / Ti3SiC2 block can be prepared. The preparation method has the advantages of low costs of the composite material of synthesized SiC / Ti3SiC2, no phase of impurities of TiC, tiny particles of SiC that are evenly distributed in the matrix, stable technological parameters and suitability for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a ceramic matrix composite material, especially the preparation of silicon carbide SiC reinforced silicon carbide titanium Ti by in-situ displacement reaction hot pressing 3 SiC 2 method for ceramic matrix composites. Background technique [0002] Silicon carbide titanium Ti 3 SiC 2 With its high electrical conductivity, anti-oxidation, thermal shock resistance, corrosion resistance, self-lubricating, easy processing and other excellent properties, it has become the preferred material for bearings, contacts, corrosion-resistant parts, high-temperature heating parts and structural parts, and key components of high-speed electrified friction . [0003] In order to further improve the Ti 3 SiC 2 High temperature mechanical properties, oxidation resistance and thermal shock resistance, SiC is often used to reinforce and toughen Ti 3 SiC 2 Material, because SiC has excellent oxidation resistance, good...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622
Inventor 李世波向卫华周洋翟洪祥
Owner BEIJING JIAOTONG UNIV
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