Nano laminated Ta2AlC ceramic powder and preparing method thereof

A nano-layered and ceramic powder technology, which is applied in the preparation of nano-layered Ta2AlC ceramic powder and its preparation field by in-situ reaction synthesis technology, to achieve the effects of high-purity particle size, low cost, and small particle size

Inactive Publication Date: 2008-03-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, about Ta 2 The work on the preparation of AlC powder has not

Method used

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  • Nano laminated Ta2AlC ceramic powder and preparing method thereof
  • Nano laminated Ta2AlC ceramic powder and preparing method thereof
  • Nano laminated Ta2AlC ceramic powder and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] With 108.56 grams of tantalum powder, 9.72 grams of aluminum powder, and 3.24 grams of graphite powder as raw materials (the molar ratio is 2:1.2:0.9, the particle size of the raw material powder is 200 mesh), ball milling in a resin tank under dry conditions for 20 hours, after sieving Put it into a graphite mold for cold pressing (20MPa), heat treatment in a graphite furnace with argon gas, the heating rate is 10°C / min, and the heat treatment time is 60 minutes at 1520°C. After the sample is cooled in the furnace, the surface impurities, Grinding and crushing and passing through a 200-mesh sieve to obtain a powder. According to X-ray diffraction analysis, the main crystal phase is Ta 2 AlC, containing a small amount of impurity as Ta 4 AlC 3 (less than 1.5 wt.%). Determination of nanolayered Ta 2 The particle size range of AlC ceramic powder is 1.5-33μm, the weight average diameter is 11.78μm, and the specific surface area is 60.59m 2 / kg.

Embodiment 2

[0024] The difference from Example 1 lies in that the molar ratio of raw material powder is different, the heating rate is different, and the heat treatment temperature and time are different.

[0025] With 130.28 grams of tantalum powder, 10.69 grams of aluminum powder, and 4.32 grams of graphite powder as raw materials (the molar ratio is 2:1.1:1, and the particle size of the raw material powder is 200 mesh), ball milling in a resin tank under dry conditions for 16 hours, after sieving Put it into a graphite mold for cold pressing (20MPa), heat treatment in a graphite furnace with argon gas, the heating rate is 15°C / min, and the heat treatment time is 30 minutes at 1600°C. After cooling in the furnace, the sample is ground to remove surface impurities , grinding and crushing and passing through a 200-mesh sieve to obtain powder. According to X-ray diffraction analysis, the main crystal phase is Ta 2 AlC, with a small amount of impurity Ta 4 AlC 3 (less than 2wt.%). Deter...

Embodiment 3

[0027] The difference from Example 1 is that the molar ratio of raw material powder is different, and the heat treatment temperature and time are different.

[0028] With 119.42 grams of tantalum powder, 10.69 grams of aluminum powder, and 3.96 grams of graphite powder as raw materials (the molar ratio is 2:1.2:1, and the particle size of the raw material powder is 200 mesh), ball milling in a resin tank under dry conditions for 12 hours, after sieving Put it into a graphite mold for cold pressing (5MPa), heat treatment in a graphite furnace with argon gas, the heating rate is 10°C / min, and the heat treatment time is 20 minutes at 1650°C. After cooling in the furnace, the sample is ground to remove surface impurities , grinding and crushing and passing through a 200-mesh sieve to obtain powder. According to X-ray diffraction analysis, the main crystal phase is Ta 2AlC, with a small amount of Ta 4 AlC 3 (less than 1.5 wt.%). Determination of nanolayered Ta 2 The particle s...

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Abstract

The invention relates to single-phase nano layered ceramic power and a preparation method, in particular to nano layered Ta2AIC ceramic power prepared by in-situ reaction and a preparation method. The nano layered Ta2AIC ceramic belongs to a hexagonal crystal system, the space group is P63/mmc, the constant a of the unit cell crystal lattice is 3.08, and the constant c is 13.85. The nano layered Ta2AIC ceramic is a good heat conductor and can be the reinforced phase of a metal matrix composite material as well as the weak interphase of a ceramic matrix composite material to increase tenacity. In the specific preparation method of the single-phase Ta2AIC powder, tantalum powder, aluminium powder and graphite powder as materials are milled in a resin pot for five to thirty hours under a dry condition, are loaded into a graphite powder die for cold pressing shaping under the pressure of 5 to 20 Mpa after being sifted out and are thermally treated in a vacuum stove or a stove filled with argon, the temperature-raising speed rate is 5 to 20 DEG C per minute, the processing time under the temperature of 1500 to 1650 DEG C is twenty to one hundred and twenty minutes, and after the surface impurities of the cooled sample are removed and the cooled sample is broken up and sifted out, the powder is produced. The Ta2AIC ceramic power prepared by the invention is characterized in high purity, small particle size and good uniformity.

Description

technical field [0001] The invention relates to a nano-layered ceramic powder and a preparation method, specifically an in-situ reaction synthesis technique for preparing nano-layered Ta 2 AlC ceramic powder and its preparation method. Background technique [0002] m n+1 AX n (M is a transition group metal, A is a group A element, X is C or N, n=1-3) has a layered hexagonal structure. Since M.W.Barsoum et al. (American Ceramic Society, J.Am.Ceram.Soc.79(1996)1953) synthesized bulk Ti for the first time by reactive hot pressing technique 3 SiC 2 Since, M n+1 AX n With its unique characteristics, it attracts more and more scientific researchers in the world. m n+1 AX n The phase has the characteristics of both ceramics and metals: low density, low hardness, high modulus, high fracture toughness, good thermal shock resistance and high temperature oxidation resistance, good electrical and thermal conductivity, and has become a very potential structure and Materials for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622
Inventor 周延春胡春峰包亦望
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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