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Preparation method of MAX-phase porous ceramic

A technology of porous ceramics and blocks, which is applied in the field of preparation of MAX-phase porous ceramics, can solve the problems of large preparation equipment, complicated preparation procedures, waste of energy, etc., and achieve the effects of low sintering temperature, high purity and space saving

Inactive Publication Date: 2017-06-13
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature: C.R.Bowen et al., Macro-porous Ti 2 AlC MAX-phase ceramics by the foam replication method, Ceramics International 41(2015) 12178-12185), complex preparation procedures, harsh conditions, high temperature and high pressure for a long time, and there are problems such as huge preparation equipment, high cost, and waste of energy

Method used

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  • Preparation method of MAX-phase porous ceramic
  • Preparation method of MAX-phase porous ceramic
  • Preparation method of MAX-phase porous ceramic

Examples

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Effect test

Embodiment 1

[0026] Take titanium powder, aluminum powder, and carbon powder with an average particle size of 200 mesh, and mix them according to 2:1:0.7. Wet ground in absolute ethanol with a mortar for 6 hours, thoroughly ground and dried. After putting a layer of carbon paper in the graphite mold, take an appropriate amount of mixture and add it to the graphite mold in batches. After adding a 3-5mm thick slurry, perform a pre-press. The pressure layers are preloaded sequentially. The mold used is a graphite mold with an inner diameter of 15-20mm. In order to ensure pressureless sintering, a punch with a slot is used so that the upper and lower punches are stuck on the sleeve, and the powder will not be damaged during the sintering process. Apply pressure, put the mold into the SPS sintering furnace, apply a pressure of 30MPa, carry out pressureless sintering at 1100°C, the heating rate is 100°C / min, fill with argon protection, take it out after holding for 10min, and obtain Ti 2 AlC b...

Embodiment 2

[0028] Take titanium powder, aluminum powder, and carbon powder with an average particle size of 250 mesh, and mix them according to 2:1.2:0.75. Wet ground in absolute ethanol with a mortar for 6.5 hours, thoroughly ground and dried. After putting a layer of carbon paper in the graphite mold, take an appropriate amount of mixture and add it to the graphite mold in batches. After adding a 3-5mm thick slurry, perform a pre-press. The pressure layers are preloaded sequentially. The mold used is a graphite mold with an inner diameter of 15-20mm. In order to ensure pressureless sintering, a punch with a slot is used so that the upper and lower punches are stuck on the sleeve, and the powder will not be damaged during the sintering process. Apply pressure, put the mold into the SPS sintering furnace, apply a pressure of 40MPa, carry out pressureless sintering at 1150°C, the heating rate is 100°C / min, fill with argon protection, take it out after holding for 10min, and obtain Ti 2 ...

Embodiment 3

[0030]Take titanium powder, aluminum powder, and titanium nitride powder with a particle size of 300 mesh, and mix them according to 1:1.1:1. Wet ground in absolute ethanol with a mortar for 7 hours, thoroughly ground and dried. After putting a layer of carbon paper in the graphite mold, take an appropriate amount of mixture and add it to the graphite mold in batches. After adding a 3-5mm thick slurry, perform a pre-press. The pressure layers are preloaded sequentially. The mold used is a graphite mold with an inner diameter of 15-20mm. In order to ensure pressureless sintering, a punch with a slot is used so that the upper and lower punches are stuck on the sleeve, and the powder will not be damaged during the sintering process. put pressure on. Put the mold into the SPS sintering furnace, apply a pressure of 45MPa, and carry out pressureless sintering at 1300°C, with a heating rate of 100°C / min, filled with argon for protection, and take it out after holding for 10 minutes...

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Abstract

The invention discloses a preparation method of MAX-phase porous ceramic. The preparation method comprises the following steps: preparing a three-phase material comprising a transition metal raw material, a main group element and a carbon or nitrogen containing compound; after mixing the materials according to a ratio, wetly grinding in an absolute ethyl alcohol medium to obtain slurry; after drying the slurry, charging the slurry into a customized die and pre-pressing; then, putting the die into an SPS (Spark Plasma Sintering) furnace; introducing argon gas and protecting; carrying out pressureless sintering; after keeping heat, taking out the die; grinding and polishing a sintered block-shaped material, and carrying out ultrasonic cleaning and drying to obtain the MAX-phase porous ceramic. The preparation method disclosed by the invention has the advantages of simplicity in operation, high reproducibility, safety and reliability; the temprature rising speed is rapid in a preparation process; the sintering temperature is low, the grain diameter is uniform and procedures are simple and convenient; a prepared MAX-phase material has high purity and large porosity; the efficiency of preparing the MAX-phase porous ceramic is greatly improved.

Description

technical field [0001] The invention belongs to the field of preparation of porous ceramics, and in particular relates to a preparation method of MAX phase porous ceramics. Background technique [0002] MAX-phase porous ceramics have shown great potential in energy storage, adsorption, sensors, conductive fillers and other fields. MAX phase is a general term for a new type of ternary compound with a microscopic layered structure, and its chemical formula can be expressed as M n+1 AX n , M represents a transition metal element; A represents a main group element; X represents carbon or nitrogen. Because of its unique crystal structure and bonding method, it has the excellent properties of both metal and ceramic. It is not only like ceramics, it has high elastic modulus, low density, good thermal stability, oxidation resistance and corrosion resistance; it is also like metal, with excellent thermal and electrical conductivity, and low hardness, which can be machined and proc...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/56C04B35/58C04B35/622
Inventor 张建峰王晓帆李改叶吴玉萍
Owner HOHAI UNIV
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