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(TiB2 plus TiC)/Ti3SiC2 multi-phase ceramic material and prepration method thereof

A technology of composite ceramics and raw materials, which is applied in the field of ceramic matrix composite materials and its preparation, can solve problems such as complex preparation process, and achieve the effect of simple process and low cost

Active Publication Date: 2009-10-14
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zan et al. (Zan Q F, Dong L M, Wang C, Wang C A, Huang Y. 2 o 3 Introducing SiC whiskers to reinforce Al 2 o 3 / Ti 3 SiC 2 Mechanical properties of composite ceramics [J]. Ceramics International, 2007, 33: 385-388) SiC whiskers were used as a secondary toughening phase, and added to the toughened Al 2 o 3 / Ti 3 SiC 2 Al 2 o 3 In the layer, due to the first-order toughening mechanism (multi-layer structure toughening), the second-order toughening mechanism (whisker toughening) and the synergistic effect of the two, the material exhibits excellent mechanical properties: bending strength 688MPa, fracture work 2583J m -2 , but the mechanical mixing method is used to introduce the reinforcing phase, and the preparation process is also relatively complicated

Method used

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  • (TiB2 plus TiC)/Ti3SiC2 multi-phase ceramic material and prepration method thereof
  • (TiB2 plus TiC)/Ti3SiC2 multi-phase ceramic material and prepration method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] molar ratio n(TiH 2 ):n(Si):n(C):n(B 4 C)=3.98:1.14:2:0.28 Weigh the raw material TiH 2 Powder (-300 mesh powder), Si powder (-300 mesh powder), graphite powder (10 micron powder) and B 4 After C powder (5 micron powder), dry mix it in a polyethylene tank for 24 hours, place it in a graphite mold coated with BN for cold pressing, and hot press and sinter it in an argon atmosphere. Pre-incubation at ℃ for 1 hour without pressure, and then increase the temperature to 1500°C at a rate of 20°C / min, and increase the pressure to 25MPa at a rate of 2MPa per 50°C increase, and then hold for 2h. The density of the obtained block material reaches 99.8%, the three-point bending strength of the material tested on the universal testing machine is greater than 680MPa, and the fracture toughness of the material measured by the unilateral notched beam method is greater than 8.5MPa m 1 / 2 . Carry out XRD analysis to the obtained product, such as figure 1 Products shown are manufactu...

Embodiment 2

[0024] molar ratio n(TiH 2 ):n(Si):n(C):n(B 4 C)=3.59:1.09:2:0.1 7 Weigh the raw material TiH 2 Powder (-300 mesh powder), Si powder (-300 mesh powder), graphite powder (15 micron powder) and B 4 C powder (10 micron powder) is dry mixed in a polyethylene tank for 24 hours, then placed in a BN-coated graphite mold for cold pressing, then hot-pressed and sintered in an argon atmosphere, and raised to 900 °C at a rate of 50 °C / min Pre-insulate without pressure for 1 hour, then raise the temperature to 1500°C at a rate of 20°C / min, and increase the pressure to 25MPa at a rate of 2MPa per 50°C increase, and then hold for 2h. The density of the obtained block material reaches 99.8%, the three-point bending strength of the material tested on the universal testing machine is greater than 680MPa, and the fracture toughness of the material measured by the unilateral notched beam method is greater than 8.5MPa m 1 / 2 .

Embodiment 3

[0026] molar ratio n(TiH 2 ):n(Si):n(C):n(B 4 C) = 3.59: 1.09: 2: 0.1 7 Weigh and weigh the raw material TiH 2 Powder (-300 mesh powder), Si powder (-300 mesh powder), graphite powder (15 micron powder) and B 4 C powder (3 micron powder) is dry mixed in a polyethylene tank for 20 hours, then placed in a BN-coated graphite mold for cold pressing, then hot-pressed and sintered in an argon atmosphere, and raised to 800 °C at a rate of 30 °C / min Pre-insulate without pressure for 50 minutes, then raise the temperature to 1600°C at a rate of 20°C / min, and increase the pressure to 22MPa at a rate of 1.5MPa per 50°C increase, and then hold for 2 hours. The density of the obtained block material reaches 99.9%, the three-point bending strength of the material tested on the universal testing machine is greater than 680MPa, and the fracture toughness of the material measured by the unilateral notched beam method is greater than 9MPa m 1 / 2 .

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Abstract

The invention relates to a (TiB2 plus TiC) / Ti3SiC2 multi-phase ceramic material and a preparation method thereof. The multi-phase ceramic material consists of plate / columnar TiB2, equiaxed TiC reinforcing phase and a layered Ti3SiC2 substrate, wherein the TiB2 accounts for 5-20 percent of the total volume of the material, and the TiC accounts for 10-15 percent of the total volume of the material. The raw materials such as TiH2 powder, Si powder, graphite powder and B4C powder are weighed according to the molar proportioning of (3.27-4.49): (1.04-1.21): 2: (0.07-0.43), evenly mixed by the physical mechanical method, then arranged in a graphite grinding tool for cold press molding and introduced into a hot-press furnace with shielding gas atmosphere for sintering. The invention has simple process and low sintering temperature, two different toughening phases in the material are synergic with the strengthening and toughening mechanism, and the material performance is excellent.

Description

Technical field: [0001] The invention relates to a ceramic matrix composite material and a preparation method thereof, specifically in situ hot pressing and sintering into a plate / column TiB 2 Multi-component reinforced Ti with equiaxed TiC 3 SiC 2 Matrix composite ceramic material and its preparation method. Background technique: [0002] Ti 3 SiC 2 It is a representative of the ternary layered machinable ceramic MAX, which combines the characteristics, structure and functional properties of metal and ceramics. It has the characteristics of low density, high modulus, thermal shock resistance, good electrical and thermal conductivity, etc. Lubricating materials Graphite and MoS 2 With lower friction coefficient and better self-lubricating performance, it is very promising to become a new generation of high-temperature structural materials, electrode materials in molten metals, machinable ceramic materials, self-lubricating materials and electrode brush materials. In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/622C04B35/64
Inventor 杨建顾巍丘泰
Owner NANJING UNIV OF TECH
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