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Preparation method of carbon-containing MAX phase material

A technology of organic carbon and powder, which is applied in the field of preparation of carbon-containing MAX phase materials, can solve the problems of further improvement in the purity of burned products, high requirements for staff, and low requirements for equipment, so as to improve dispersion uniformity and high temperature The effects of reactivity, low preparation cost, and low requirements for firing equipment

Active Publication Date: 2020-09-18
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] To sum up, the problems existing in the prior art are: (1) Although the hot-press sintering and in-situ hot-press / solid-liquid phase reaction process can obtain carbon-containing MAX phase materials with higher purity, the preparation equipment costs The investment is large, the preparation process is relatively complicated, and the requirements for the staff are high, and the burned product needs to be further crushed
(2) Pressureless sintering method, although the preparation process has been relatively simplified and the requirements for equipment are relatively low, but the purity of the sintered product needs to be further improved

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  • Preparation method of carbon-containing MAX phase material
  • Preparation method of carbon-containing MAX phase material
  • Preparation method of carbon-containing MAX phase material

Examples

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preparation example Construction

[0046] A method for preparing a carbon-containing MAX phase material, which is characterized in that the preparation method of the carbon-containing MAX phase material is to uniformly mix the premixed powder of the M source powder and the A source powder with a liquid organic carbon source in a certain proportion After mixing, it is molded at a certain curing temperature and a certain curing pressure, and then subjected to pressureless firing at a certain firing temperature to obtain a carbon-containing MAX phase material. In the MAX phase, M is a transition group metal element, A is a main group element, and X is C. Described preparation method comprises the steps:

[0047] Step 1: Powder premixing

[0048] Evenly mix the source M powder and the source A powder in a certain proportion, and obtain the premixed powder of the source M powder and the source A powder through ball milling, drying, and sieving;

[0049] Step 2: Mix the premixed powder with the liquid organic carbo...

Embodiment 1

[0073] according to figure 2 The preparation process of the carbon-containing MAX phase material shown, in this embodiment, Ti 3 SiC 2 The preparation method of material comprises the following steps:

[0074] Step 1: Powder premixing. Pour Ti powder and Si powder with a particle size of 325 mesh into the ball mill tank of the planetary ball mill at a molar ratio of 15:6, wet ball mill for 6 h, and then grind at 60 o Dry at C for 8 h, and pass through a 100-mesh sieve to obtain Ti and Si premixed powder. The ball milling medium is absolute ethanol, and the balls are silicon nitride balls.

[0075] Step 2: Mix Ti and Si premixed powder with liquid phenolic resin. Pour the Ti and Si premixed powder into the agate mortar first, then add liquid phenolic resin to the mortar in stages, and add the phenolic resin while mixing. The molar ratio of Ti powder, Si powder and residual carbon in the phenolic resin is 15:6:12, after mixing for 1 h, the plastic clay with uniform dispers...

Embodiment 2

[0079] In this example, Ti 2 The preparation method of AlC material comprises the following steps:

[0080] Step 1: Powder premixing. Pour the Ti powder and Al powder with a particle size of 200 mesh into a polyurethane ball mill tank at a molar ratio of 14:8, place the ball mill tank on a horizontal roller ball mill for dry mixing for 12 h, and then place it in a vacuum drying oven to fully dry. After passing through a 100-mesh sieve for later use, the grinding balls are steel core polyurethane balls, and the drying temperature is 40 o c.

[0081] Step 2: Mix Ti and Al premixed powder with liquid phenolic cyanate resin. First add Ti and Al premixed powder into the feeding port of the vacuum mud refining machine, start the vacuum mud refining machine, the speed is 5 rpm, add liquid phenolic cyanate resin to it in stages, and wait until the resin is all added, put The speed of the vacuum mud mill was increased to 40 rpm, and the kneading was continued for 1.5 h, so that the...

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Abstract

The invention relates to a preparation method of a carbon-containing MAX phase material. M is a transition group metal element; A is a main group element; and X is C. A pestle-mortar mixing or vacuumpugging process is adopted, mixed powder of M source powder and A source powder is evenly mixed with a liquid organic carbon source in a certain proportion to obtain plastic pug, the pug is subjectedto hot-pressing curing forming, and then the carbon-containing MAX phase material is obtained through pressure-free firing. Compared with the prior art, the method introduces the liquid organic carbonsource, can realize more uniform dispersion of a carbon component in a green body, has a higher carbon residue rate, can be pyrolyzed and converted into the carbon component with high reaction activity in the heating process, and is beneficial to reaction synthesis of the high-purity carbon-containing MAX phase material. The method is simple in preparation process and low in requirement on firingequipment, and the problems of low product purity and high preparation cost in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of ceramic material preparation, and in particular to a preparation method of a carbon-containing MAX phase material. Background technique [0002] Ternary layered ceramic M n+1 AX n (n = 1, 2, 3) ceramics (abbreviated as MAX phase), where M is a transition group metal element (it can be Ti, Zr, Hf, V, Nb, Ta, Sc, Cr and Mo), and A is the main group Elements (can be Si, Al, Ge, Sn, Pb, P, S, Ga, As, Cd, In or Tl), X is C or N element, these MAXs also belong to the hexagonal system, and the space group is P6 3 / mmc. Its crystal structure can be described as M 6 The X octahedron and the A atomic layer are stacked at intervals. M-X is mainly bonded by strong covalent bonds and ionic bonds, while the bond between M-X and A atoms is relatively weak. This unique bonding method enables MAX phase ceramics to combine some of the excellent properties of metals and ceramics, such as high strength, high modulus, h...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622C04B35/626C04B35/65
CPCC04B35/56C04B35/5615C04B35/5618C04B35/5607C04B35/622C04B35/62625C04B35/62605C04B35/65C04B2235/428C04B2235/404C04B2235/402C04B2235/48C04B2235/38C04B2235/40C04B2235/3232C04B2235/5436C04B2235/658C04B2235/656C04B2235/6567C04B2235/668
Inventor 张军伟赵金萍谷兵伟陈瑶赵亮王娜解磊乔宁
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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