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In-situ (TiB2+SiC)/Ti3SiC2 complex phase ceramic material and preparation method thereof

A composite ceramics, in-situ technology, applied in the field of in-situ/Ti3SiC2 composite ceramic materials and its preparation, can solve the problems of microhardness and oxidation resistance of composite materials to be improved, and achieve low cost and good mechanical properties , The effect of simple process

Active Publication Date: 2011-09-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

in situ synthesized (TiB 2 +TiC) / Ti 3 SiC 2 The microstructure of the composite material is uniform, the grains are fine, and the particle interface of the reinforcing phase is free from pollution, but the microhardness and oxidation resistance of the composite material still need to be improved

Method used

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  • In-situ (TiB2+SiC)/Ti3SiC2 complex phase ceramic material and preparation method thereof
  • In-situ (TiB2+SiC)/Ti3SiC2 complex phase ceramic material and preparation method thereof
  • In-situ (TiB2+SiC)/Ti3SiC2 complex phase ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] molar ratio n(TiH 2 ):n(Si):n(TiC):n(B 4 C):n(Al)=0.9194:1:1.5012:0.1833:0.1369 Weigh raw material TiH 2 powder (300 mesh), Si powder (300 mesh), TiC powder (1.5μm), B 4 After C powder (5μm) and Al powder (200 mesh), dry mix them in a polyethylene tank for 24 hours, place them in a BN-coated graphite mold for cold press molding, and hot press sinter in an argon atmosphere at 30°C / min The speed is raised to 850°C for 55 minutes without pressure, and then the temperature is raised to 1500°C at a rate of 30°C / min. After reaching the sintering temperature, the pressure is increased to 22MPa at a rate of 3MPa every 3 minutes, and the holding time is 1.5h . The density of the obtained bulk material reaches 99.7%, among which TiB 2 Accounting for 15% of the volume of the composite ceramic material, SiC accounts for 10% of the volume of the composite ceramic material; the three-point bending strength of the material tested on the universal testing machine is greater than 78...

Embodiment 2

[0023] molar ratio n(TiH 2 ):n(Si):n(TiC):n(B 4 C): n(Al)=1.2003:1:1.5994:0.2003:0.15994 Weigh raw material TiH 2 powder (300 mesh), Si powder (300 mesh), TiC powder (1.5μm), B 4 C powder (5μm) and Al powder (-200 mesh) were dry mixed in a polyethylene tank for 24 hours, then placed in a BN-coated graphite mold for cold pressing, and then hot-pressed and sintered in an argon atmosphere at 50°C / min The speed is raised to 900°C for 50 minutes without pressure, and then the temperature is raised to 1450°C at a rate of 20°C / min. After reaching the sintering temperature, the pressure is increased to 24MPa at a rate of 2.5MPa every 5 minutes, and the holding time is 1.8 h. The density of the obtained bulk material reaches 99.7%, among which TiB 2 Accounting for 14.5% of the volume of the composite ceramic material, SiC accounts for 5% of the volume of the composite ceramic material; the three-point bending strength of the material tested on the universal testing machine is great...

Embodiment 3

[0025] molar ratio n(TiH 2 ):n(Si):n(TiC):n(B 4 C): n(Al)=1.1998:1:1.6011:0.2005:0.15994 Weigh raw material TiH 2 powder (300 mesh), Si powder (300 mesh), TiC powder (1μm), B 4 C powder (10 μm) and Al powder (200 mesh) were dry-mixed in a polyethylene tank for 24 hours, then placed in a BN-coated graphite mold for cold pressing, and then hot-pressed and sintered in an argon atmosphere at a temperature of 30 °C / min. The rate was raised to 900°C for 60 minutes without pressure, and then the temperature was raised to 1400°C at a rate of 50°C / min. After reaching the sintering temperature, the pressure was increased to 25MPa at a rate of 3MPa every 4 minutes, and the holding time was 2h. The density of the obtained bulk material reaches 99.6%, among which TiB 2 Accounting for 14.5% of the volume of the composite ceramic material, SiC accounts for 5% of the volume of the composite ceramic material; the three-point bending strength of the material tested on the universal testing m...

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Abstract

The invention relates to an in-situ (TiB2+SiC) / Ti3SiC2 complex phase ceramic material. The in-situ (TiB2+SiC) / Ti3SiC2 complex phase ceramic material is characterized by consisting of a laminated Ti3SiC2 matrix and two reinforced phases of columnar TiB2 and granular SiC, wherein the TiB2 accounts for 13 to 15 percent of the total volume of the complex phase ceramic material; and the SiC accounts for 5 to 15 percent of the total volume of the complex phase ceramic material. A preparation method of the in-situ (TiB2+SiC) / Ti3SiC2 complex phase ceramic material comprises the following steps of: weighing TiH2 powder, Si powder, TiC powder, B4C powder and Al powder according to the molar ratio of the TiH2 powder to the Si powder to the TiC powder to the B4C powder to the Al powder of (0.9-1.3):(1):(1.4-1.6):(0.15-2.1):(0.13-0.16); mixing the raw materials uniformly; putting the mixture into a graphite mould to perform cold moulding; and performing hot pressed sintering in a graphite resistance furnace under protective atmosphere. The process is simple and the material has excellent properties.

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 to synthesize columnar TiB 2 Multi-component reinforced Ti with granular SiC 3 SiC 2 Matrix composite ceramic material and preparation method thereof, that is, an in-situ (TiB 2 +SiC) / Ti 3 SiC 2 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 coefficient of friction and better self-lubricating performance, it is very promising to become a new generation of high-temperature structural materials, electrode materials ...

Claims

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Application Information

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IPC IPC(8): C04B35/515C04B35/622
Inventor 杨建宋凯丘泰潘丽梅
Owner NANJING UNIV OF TECH
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