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Preparation method of Ta2AlC-Ta4AlC3 composite material

A ta2alc-ta4alc3, composite material technology, applied in the field of new structural material preparation, can solve the problems of inability to inquire about SPS sintering synthesis preparation, few reports on synthesis preparation, etc., and achieve the effects of short synthesis time, lower sintering temperature, and simple process

Inactive Publication Date: 2019-04-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

About 4 AlC 3 There are few reports on the synthesis and preparation of the block, and at the same time, there is no method for the synthesis of Ta 2 AlC-Ta 4 AlC 3 Composites report, Ta 2 AlC-Ta 4 AlC 3 The SPS sintering synthesis preparation of composite materials is even more inaccessible

Method used

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  • Preparation method of Ta2AlC-Ta4AlC3 composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: a kind of Ta 2 AlC-Ta 4 AlC 3 The preparation method of composite material comprises the following steps:

[0019] (1) Using tantalum powder, aluminum powder and tantalum carbide powder as raw materials, according to the molar ratio of Ta:Al:TaC =1:1.4:1 and adding tantalum carbide powder with a mass fraction of 10%;

[0020] (2) Put the above ingredients into a ball mill tank, and wet mix them on a planetary ball mill for 15 hours;

[0021] (3) Adopt rotary evaporator to dry mixed material, then put into graphite abrasive tool and carry out pre-compression, pre-compression pressure is 20Mpa;

[0022] (4) The mold was placed in a spark plasma sintering furnace, heated to 1500°C at a heating rate of 200°C / min under the protection of Ar gas, and kept at a pressure of 500MPa for 5min. After the heat preservation is completed, cool down to room temperature with the furnace to obtain Ta 2 AlC-Ta 4 AlC 3 Composite bulk ceramics.

Embodiment 2

[0023] Embodiment 2: a kind of Ta 2 AlC-Ta 4 AlC 3 The preparation method of composite material comprises the following steps:

[0024] (1) Using tantalum powder, aluminum powder and tantalum carbide powder as raw materials, according to the molar ratio of Ta:Al:TaC =1:1.4:1 and adding tantalum carbide powder with a mass fraction of 20%;

[0025] (2) Put the above ingredients into a ball mill tank, and wet mix them on a planetary ball mill for 15 hours;

[0026] (3) Adopt rotary evaporator to dry the mixed material, then put it into the graphite abrasive tool and carry out pre-compression, the pre-compression pressure is 20Mpa;

[0027] (4) The mold was placed in a spark plasma sintering furnace, heated to 1500°C at a heating rate of 200°C / min under the protection of Ar gas, and kept at a pressure of 500MPa for 5min. After the heat preservation is completed, cool down to room temperature with the furnace to obtain Ta 2 AlC-Ta 4 AlC 3 Composite bulk ceramics.

Embodiment 3

[0028] Embodiment 3: a kind of Ta 2 AlC-Ta 4 AlC 3 The preparation method of composite material comprises the following steps:

[0029] (1) Using tantalum powder, aluminum powder and tantalum carbide powder as raw materials, according to the molar ratio of Ta:Al:TaC =1:1.4:1 and adding tantalum carbide powder with a mass fraction of 30%;

[0030] (2) Put the above-mentioned ingredients into a ball mill tank, and wet mix them on a planetary ball mill for 15 hours;

[0031] (3) Adopt rotary evaporator to dry the mixed material, then put it into the graphite abrasive tool and carry out pre-compression, the pre-compression pressure is 20Mpa;

[0032](4) The mold was placed in a spark plasma sintering furnace, heated to 1500°C at a heating rate of 200°C / min under the protection of Ar gas, and kept at a pressure of 500MPa for 5min. After the heat preservation is completed, cool down to room temperature with the furnace to obtain Ta 2 AlC-Ta 4 AlC 3 Composite bulk ceramics.

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Abstract

The invention discloses a preparation method of a Ta2AlC-Ta4AlC3 composite material, which is characterized by comprising the following steps of: using tantalum powder, aluminum powder and tantalum carbide powder as raw materials, proportioning according to a certain molar ratio, and adding 10-50%, by mass, of tantalum carbide powder to prepare the raw materials of the composite material; puttingthe raw materials into a ball milling tank, and carrying out wet mixing on the raw materials on a planetary ball mill for 15 hours; drying the mixture by adopting a rotary evaporator, and then puttingthe mixture into a graphite grinding tool for prepressing; placing a mould in a discharge plasma sintering furnace, and heating under the protection of Ar gas; compared with the prior art, the methodhas the advantages that a novel method for preparing the Ta2AlC-Ta4AlC3 composite material block ceramic is provided, the process is simple, and the synthesis time is short; sintering is carried outin the pressurizing process, plasma generated by pulse current and pressurizing in the sintering process are beneficial to reducing the sintering temperature of the powder, and meanwhile, due to the characteristics of low voltage and high current, the powder can be rapidly sintered and densified.

Description

technical field [0001] The invention belongs to the technical field of preparation of new structural materials, in particular to a spark plasma sintering process for preparing Ta 2 AlC-Ta 4 AlC 3 Methods for composite bulk ceramics. Background technique [0002] Ternary layered ceramic M n+1 AX n (Where: M is an early transition metal; A is Ⅲ A or IV A Group elements; X is C or N; n=1, 2, 3; MAX for short). m n+1 AX n It belongs to the hexagonal crystal structure, and the space point group is P6 3 / mmc. Ta 2 AlC, Ta 4 AlC 3 are the representatives of phase 211 and phase 413 in the MAX phase respectively, where Ta 2 AlC lattice parameters are a=3.075Å, c=13.83Å, Ta 4 AlC 3 The lattice parameters are a=3.10884 ± 0.00004 Å, c=24.0776 ± 0.0004 Å. The MAX phase combines the properties of metal and ceramics. It not only has good electrical conductivity, thermal conductivity, machinability, thermal shock resistance and good damage tolerance like metal, but also ha...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/65
CPCC04B35/5607C04B35/65C04B2235/402C04B2235/404C04B2235/666
Inventor 应国兵马凤辰刘璐宿琳张晨
Owner HOHAI UNIV
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