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MAX phase-conductive ceramic material and preparation method thereof

A conductive ceramic material and molecular formula technology, applied in the application field, can solve problems such as unsuccessful preparation, and achieve the effects of simple preparation method, high bulk modulus, and high elastic modulus

Active Publication Date: 2019-04-26
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no relevant M before the application of the present invention 3 A 2 A precedent for the successful preparation of phase X

Method used

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  • MAX phase-conductive ceramic material and preparation method thereof
  • MAX phase-conductive ceramic material and preparation method thereof
  • MAX phase-conductive ceramic material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0025] ① Use Nb powder with a purity of 99%, As powder with a purity of 99%, and graphite powder with a purity of 99%, weigh them according to the ratio of 3:2:1, and grind them under a protective atmosphere such as argon; then mix them evenly The sample was pressed into tablets using a tablet press, the sample was placed in a quartz tube, vacuumed and sealed, and the sample was first calcined: first, it took 5 hours to rise from room temperature to 850 ° C, and kept it for 5 hours, and then cooled naturally .

[0026] ②Take out the sample calcined for the first time, grind it again, press it into tablets, and place the sample in a quartz tube, vacuumize it and seal it with a seal, and then carry out final firing: it takes 5 hours to raise the temperature from room temperature to 1000°C, and then to 200 minutes to 1280°C. Insulate for 15 hours, cool down to room temperature at 3°C ​​per minute to obtain high-purity Nb 3 As 2 C sample. Need to heat up to 1280°C quickly, avo...

Embodiment 2

[0031] ① Use Nb powder with a purity of 99%, P powder with a purity of 99%, and graphite powder with a purity of 99%, weigh them in a ratio of 3:2:1, and grind them under a protective atmosphere such as argon; then mix them evenly The sample is pressed into a tablet using a tablet press, and the sample is placed in a quartz tube, vacuumed and sealed, and the sample is first calcined: first, it takes 48 hours to rise from room temperature to 850°C, keep it warm for 300 minutes, and then cool naturally.

[0032] ②Take out the sample after the initial calcination, re-grind, press into tablets, and place the sample in a quartz tube, vacuumize and seal it, and then carry out final firing: from room temperature to 1000°C in 300 minutes, then to 1280°C in 200 minutes ℃. Insulated for 15 hours, cooled to room temperature at 3°C ​​per minute to obtain Nb 3 P 2 C sample.

[0033] 3. get the Nb prepared by embodiment 2 3 P 2 C sample, adopt X-ray diffractometer to observe its diffra...

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Abstract

The invention discloses a MAX phase-conductive ceramic material and a preparation method thereof. Different from the traditional MAX(Mn+1AXn) phase, the novel MAX phase molecular formula can be represented as Mn+1AnX, M is metal elements V, Nb and Ta of VB family in the molecular formula, A is main group element P or As of the VA family, and X is C or N element, wherein n is equal to 2; the spacegroup of the MAX phase is P63 / mmc, and belongs to hexagonal system; the crystal structure of the MAX phase can be formed by alternately stacking the single-layer MX octahedron layer and a double-layerMA triangular prism layer. The invention further discloses the excellent mechanical property and low thermal expansion coefficient of the Nb3As2C sample prepared through the above method, the novel MAX phase has application prospect in the high-temperature conductive ceramics, the low-expansion coefficient material and like fields.

Description

technical field [0001] The invention relates to the application fields of inorganic non-metallic materials, high-temperature conductive ceramics, structural functional ceramics, etc., and specifically relates to a high-temperature solid-phase synthesis of a new M 3 A 2 The X-phase approach. technical background [0002] The MAX phase is a series of layered conductive ceramic materials, because it has the advantages of both metal and ceramic materials, and is called conductive ceramics. MAX usually has good electrical conductivity, thermal conductivity, low thermal expansion coefficient, high bulk modulus and elastic modulus, and good anti-oxidation and corrosion resistance, etc., and has good application prospects in many fields, especially at high temperature Structural components and high temperature conductive components and other fields. The molecular formula of the MAX phase can usually be expressed as M n+1 AX n material, according to n There can be 211 phase, 31...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/58C04B35/622
CPCC04B35/56C04B35/58C04B35/622C04B2235/3817C04B2235/3852C04B2235/404C04B2235/42C04B2235/425
Inventor 陈洪祥陈小龙郭丽伟金士锋
Owner FUJIAN UNIV OF TECH
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