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Porous Ti3AlC2 ceramic and washing preparation method thereof by using NaCl

A technology of ceramics and porous titanium, which is applied in the field of preparation of porous Ti3AlC2 ceramics and its NaCl water washing, which can solve the problems of application limitations and reduce the effective use area of ​​the catalyst active layer, and achieve the effects of convenient operation, low cost and simple process

Active Publication Date: 2014-05-28
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, domestic and foreign research on porous Ti 3 AlC 2 The reports on ceramics are very limited, the existing preparation of porous Ti 3 AlC 2 The method of ceramics adopts the way of reaction sintering (reference: J.S.Yang, C.J.Liao, J.F.Wang, Y.Jiang, Y.H.He, Ceram.Inter,.2014, 40:4643), due to the formation of liquid phase during the sintering process , the generated pores have a large number of closed pores, which are limited by the application
For example, as a catalyst support material, it will reduce the effective utilization area of ​​the catalyst active layer on the support pore wall

Method used

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  • Porous Ti3AlC2 ceramic and washing preparation method thereof by using NaCl
  • Porous Ti3AlC2 ceramic and washing preparation method thereof by using NaCl

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] Weigh Ti with a purity of 98.4% 3 AlC 2 97.5 grams of powder, 2.5 grams of NaCl powder with a purity of 99.8%, add 200 grams of agate balls after mixing, ball mill and mix for 2 hours, put the mixed powder into a Φ76 steel mold, and apply a pressure of 20 MPa to make the The powder is compacted and formed, the compacted powder body is put into a sealed bag, vacuumized and sealed, and a pressure of 200 MPa is applied on a cold isostatic press, and the above block is put into a beaker filled with deionized water, Soak for 24 hours to make NaCl completely dissolve in water, put the above-mentioned block after removing NaCl into an oven, and dry at 60°C, put the dried block into a high-temperature furnace, under the protection of argon, press / min heating rate, the furnace temperature is raised to 1300°C, kept for 30min, then cooled at a rate of 15°C / min, and after cooling, the porous Ti of the present invention is obtained 3 AlC 2 ceramics.

[0024] Measured above poro...

Embodiment approach 2

[0026] Weigh Ti with a purity of 98.4% 3 AlC 2 47.45 grams of powder, 2.55 grams of NaCl powder with a purity of 99.8%, add 100 grams of agate balls after mixing, ball mill the mixture for 2 hours, put the mixed powder into a Φ20 steel mold, and apply a pressure of 20 MPa to make the The powder is compacted and formed, the compacted powder body is put into a sealed bag, vacuumized and sealed, and a pressure of 200 MPa is applied on a cold isostatic press, and the above block is put into a beaker filled with deionized water, Soak for 24 hours to make NaCl completely dissolve in water, put the above-mentioned block after removing NaCl into an oven, and dry at 65°C, put the dried block into a high-temperature furnace, under the protection of argon, press 20°C / min heating rate, the furnace temperature is raised to 1300°C, kept for 30min, then cooled at a rate of 15°C / min, and after cooling, the porous Ti of the present invention is obtained 3 AlC 2 ceramics.

[0027] Measured...

Embodiment approach 3

[0029] Weigh Ti with a purity of 98.4% 3 AlC 2 82.9 grams of powder, 17.1 grams of NaCl powder with a purity of 99.8%, add 180 grams of agate balls after mixing, ball mill and mix for 4 hours, put the mixed powder into a Φ76 steel mold, and apply a pressure of 20 MPa to make the The powder is compacted and formed, the compacted powder body is put into a sealed bag, vacuumized and sealed, and a pressure of 220 MPa is applied on a cold isostatic press, and the above block is put into a beaker filled with deionized water, Soak for 22 hours to make NaCl completely dissolve in water, put the above-mentioned block after removing NaCl into an oven, and dry at 70°C, put the dried block into a high-temperature furnace, under the protection of argon, press the / min heating rate, the furnace temperature is raised to 1400°C, kept for 45min, and then cooled at a rate of 10°C / min, after cooling, the porous Ti of the present invention is obtained 3 AlC 2 ceramics.

[0030] Measured above...

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Abstract

The invention relates to porous Ti3AlC2 ceramic and a washing preparation method thereof by using NaCl. The ceramic has a through hole structure; porosity is between 20% and 80%; and an opening porosity is between 85% and 99%. A preparation method of the material comprises the steps of selecting 5-8 vol.% of NaCl, with the balance being Ti3AlC2; mixing NaCl and Ti3AlC2 uniformly; shaping the mixed powder; applying a pressure of 200-250 MPa; immersing for 18-24 h with deionized water so as to dissolve NaCl completely; then heating a furnace to a temperature of 1,300-1,400 DEG C at a heating rate of 10-30 DEG C / min in a high temperature furnace under the protection of argon; keeping the temperature for 30-60 min; then cooling at a rate of 10-15 DEG C / min, and after cooling, obtaining the porous Ti3AlC2 ceramic. The preparation method provided by the invention has the significant characteristics of simple process, convenient operations and economy. The porous Ti3AlC2 ceramic prepared by the method is clean in pore interfaces without impurities; and porosity, pore shape and size can be controlled by the volume content, shape and size of NaCl. The porous Ti3AlC2 ceramic prepared by the method can be widely applied in key devices of the fields such as traffic and transportation, aerospace and military industry.

Description

technical field [0001] The invention relates to a porous Ti with a through-hole structure 3 AlC 2 Ceramics and its NaCl water washing preparation method. Background technique [0002] Porous ceramic material is a new type of ceramic material. Because of its good permeability, low density, large specific surface area, small thermal conductivity, high temperature resistance, corrosion resistance, and flame resistance, it is widely used in metallurgy, chemical industry, etc. , environmental protection, biology, medicine, ships, aerospace and other fields. However, in some applications, traditional porous ceramics are limited in application due to their shortcomings such as non-conductivity or poor conductivity, difficulty in electric heating, and poor thermal shock resistance, such as automobile exhaust purification catalyst supports. [0003] Titanium Aluminum Carbon (Ti 3 AlC 2 ) is a new type of ternary carbide ceramics, first discovered by M.A.Pietzka and J.C.Schuster ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B38/04C04B35/622
Inventor 黄振莺翟洪祥罗潇李翠伟李萌启周洋
Owner BEIJING JIAOTONG UNIV