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Method for preparing Ti2AlC on basis of ultrasonic wave assistance thermal explosion reaction

A thermal explosion reaction and ultrasonic-assisted technology, which is applied in the preparation of relatively pure compounds by thermal explosion reaction, and in the field of preparation of Ti2AlC based on ultrasonic-assisted thermal explosion reaction, can solve the problems of poor controllability and difficulty, so as to improve the chemical reaction rate and accelerate material transfer speed effect

Inactive Publication Date: 2016-01-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the traditional thermal explosion reaction has the characteristics of fast, violent, and poor controllability. Most of the reaction products have intermediate transition phases, so it is difficult to obtain relatively pure products.

Method used

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  • Method for preparing Ti2AlC on basis of ultrasonic wave assistance thermal explosion reaction
  • Method for preparing Ti2AlC on basis of ultrasonic wave assistance thermal explosion reaction
  • Method for preparing Ti2AlC on basis of ultrasonic wave assistance thermal explosion reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Mix Ti powder (purity 99.9%, average particle size 20 μm), Al powder (purity 99.9%, average particle size 40 μm) and graphite powder (purity 99.9%, average particle size 40 μm) in a molar ratio of 2:1:1, Then fully grind in glass mortar for 30min to obtain mixed powder;

[0035] Step 2: put the mixed powder into a cylindrical steel mold with an inner diameter of 10mm, and cold-press it into a cylindrical green body with a thickness of 15mm under a radial pressure of 130MPa;

[0036] Step 3: In an argon atmosphere, the green body is heated at 730°C, and when heated for 100 s, ultrasonic waves with a power of 1.5 kW are directly added to the green body through an ultrasonic horn until the thermal explosion reaction ends, thereby obtaining The main phase is ternary Ti 2 The reaction product of AlC.

[0037] figure 1 It is the temperature change curve during the heating process of the Al-Ti-C body. When the green body is heated to 95s, its temperature is about 6...

Embodiment 2

[0040] Step 1: Mix Ti powder (purity 99.9%, average particle size 20 μm), Al powder (purity 99.9%, average particle size 40 μm) and graphite powder (purity 99.9%, average particle size 40 μm) in a molar ratio of 2:1:1, Then fully grind in glass mortar for 40min to obtain mixed powder;

[0041] Step 2: put the mixed powder into a cylindrical steel mold with an inner diameter of 10mm, and cold-press it into a cylindrical green body with a thickness of 10mm under a radial pressure of 130MPa;

[0042] Step 3: In an argon atmosphere, the green body is heated at 780 ° C, and when heated for 95 s, ultrasonic waves with a power of 1.0 kW are directly added to the green body through an ultrasonic horn until the thermal explosion reaction ends, thereby obtaining The main phase is ternary Ti 2 The reaction product of AlC.

Embodiment 3

[0044] Step 1: Mix Ti powder (purity 99.9%, average particle size 20 μm), Al powder (purity 99.9%, average particle size 40 μm) and graphite powder (purity 99.9%, average particle size 40 μm) in a molar ratio of 2:1:1, Then fully grind in glass mortar for 50min to obtain mixed powder;

[0045] Step 2: put the mixed powder into a cylindrical steel mold with an inner diameter of 10mm, and cold-press it into a cylindrical green body with a thickness of 20mm under a radial pressure of 130MPa;

[0046] Step 3: In an argon atmosphere, the green body is heated at 700 ° C, and when heated for 110 s, ultrasonic waves with a power of 1.3 kW are directly added to the green body through an ultrasonic horn until the thermal explosion reaction ends, thereby obtaining The main phase is ternary Ti 2 The reaction product of AlC.

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Abstract

The invention discloses a method for preparing Ti2AlC on the basis of ultrasonic wave assistance thermal explosion reaction. The method comprises the following steps of 1, mixing Ti powder, Al powder and graphite powder according to a mol ratio being 2:1:1, and then performing grinding to obtain mixed powder; 2, putting the mixed powder into a mold for cold pressing to obtain green bodies; 3, in the insert atmosphere, directly heating the green bodies at 700 to 800 DEG C; when the heating is performed for 90 to 110s, exerting ultrasound with the power being 1.0 to 1.5kW onto the bodies of the green bodies until the thermal explosion reaction is completed, so that a reaction product with the main phase being ternary Ti2AlC is obtained. The method has the advantages that the ultrasound is used for assisting the thermal explosion reaction, and the pure Ti2AlC can be fast prepared under the low-temperature condition.

Description

technical field [0001] The invention belongs to the field of rapid preparation of advanced materials, relates to a method for preparing relatively pure compounds by thermal explosion reaction, and in particular relates to a method for preparing Ti based on ultrasonic-assisted thermal explosion reaction 2 AlC method. Background technique [0002] Ternary carbide Ti 2 AlC belongs to the hexagonal crystal structure with space group P6 3 / mmc, which combines the advantages of metal and ceramics: high electrical conductivity, thermal conductivity, excellent toughness, machinability, and good high temperature resistance, corrosion resistance, friction and wear resistance and other properties. Based on the above advantages, Ti 2 AlC can be used in a new generation of brush and electrode materials, high-temperature engine materials, and various wear-reducing components that work under various high-temperature and chemical corrosion conditions. Currently, based on different initi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/30
Inventor 刘志伟皇志富邢建东高义民
Owner XI AN JIAOTONG UNIV
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