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Method for preparing high-purity Ti3AlC2 ceramics

A ceramic and high-purity technology, applied in the field of material science, can solve the problems of narrow reaction temperature range, influence on purity, and high preparation temperature, and achieve the effects of convenient operation, increased reactivity and high purity

Inactive Publication Date: 2011-05-18
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, Ti 3 AlC 2 The high preparation temperature (greater than 1350°C) and the narrow reaction temperature range of the system are also an important reason affecting its purity

Method used

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  • Method for preparing high-purity Ti3AlC2 ceramics
  • Method for preparing high-purity Ti3AlC2 ceramics
  • Method for preparing high-purity Ti3AlC2 ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) First, get TiC powder, Ti powder and Al powder and mix according to the atomic ratio of TiC powder: Ti powder: Al powder=2.0:1.0:1.0;

[0017] 2) Next, put the mixed powder into a stainless steel ball milling tank, add 0.5% of the mass of the mixed powder to sodium stearate as a dispersant, and 50% ethanol as a ball milling aid to make a mixture for ball milling. It is a steel ball, the mill speed is 800 rpm, the mass ratio of the ball to the mixture is 8:1, and the ball mill is milled for 4 hours to obtain a fine powder and dried;

[0018] 3) Then, pre-press the dried mixture into a cake shape, put it into a graphite mold, and raise the temperature from room temperature to 300°C at a rate of 5°C / min under vacuum, and then increase the temperature at a rate of 10°C / min The temperature is raised to 1500°C, and when the temperature reaches 700°C, pressurization is started to make the pressure reach 20MPa, and the temperature is kept for 2 hours;

[0019] 4) Finally, a...

Embodiment 2

[0024] 1) First, get TiC powder, Ti powder and Al powder and mix according to the atomic ratio of TiC powder: Ti powder: Al powder=2.0:1.0:1.0;

[0025] 2) Next, put the mixed powder into a stainless steel ball milling tank, add 0.5% of the mass of the mixed powder to sodium stearate as a dispersant, and 40% ethanol as a ball milling aid to make a mixture for ball milling. It is a steel ball, the mill speed is 800 rpm, the mass ratio of the ball to the mixture is 8:1, and the ball mill is milled for 4 hours to obtain a fine powder and dried;

[0026] 3) Then, pre-press the dried mixture into a cake shape, put it into a graphite mold, and raise the temperature from room temperature to 300°C at a rate of 10°C / min under vacuum, and then increase the temperature at a rate of 20°C / min The temperature is raised to 1450°C, and when the temperature reaches 700°C, pressurization is started to make the pressure reach 20MPa, and the temperature is maintained for 2 hours;

[0027] 4) Fin...

Embodiment 3

[0032] 1) First, get TiC powder, Ti powder and Al powder and mix according to the atomic ratio of TiC powder: Ti powder: Al powder=2.0:1.0:1.2;

[0033] 2) Next, put the mixed powder into a stainless steel ball mill jar, add 1.2% sodium stearate as a dispersant and 60% ethanol as a ball milling aid to make a mixture for ball milling, and the grinding medium It is a steel ball, the mill speed is 1000 rpm, the mass ratio of the ball to the mixture is 12:1, and the ball mills for 2 hours to obtain a fine powder and dry it;

[0034] 3) Then, pre-press the dried mixture into a cake shape, put it into a graphite mold, raise the temperature from room temperature to 1300°C at a rate of 20°C / min under vacuum, and start pressurizing when the temperature reaches 700°C Make the pressure reach 10MPa, keep the heat and pressure for 0.5 hours;

[0035] 4) Finally, after the heat preservation and pressure holding are completed, the Ti 3 AlC 2 ceramics.

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Abstract

The invention relates to a method for preparing high-purity Ti3AlC2 ceramics, comprising the following steps: carrying out wet milling on TiC powder, Ti powder and Al powder which serve as raw materials in the presence of sodium stearate serving as dispersing agent and ethanol serving as ball-milling assistant; cooling the mixture at room temperature, sieving and prepressing into a cake-shaped material; and placing the cake-shaped material into a graphite mould, heating to 1300-1500 DEG C at a heating rate of 5 DEC C / min-20 DEG C / min, carrying out heat preservation for 0.5-3 hours at a hot-pressing pressure of 10-25MPa, and then cooling to room temperature. In the invention, the process is simple, and the ball-milling assistant and the dispersing agent are added, thus the ball-milling mixing efficiency is obviously improved, the reactivity can be enhanced, and the prepared product is uniform in crystallite dimension; and simple substances Ti powder and C powder are replaced by TiC, thus the cost is lowered, the product purity is higher, and the main crystalline phase is Ti3AlC2.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a high-purity Ti 3 AlC 2 Methods of preparation of ceramics. Background technique [0002] High-tech industries such as aerospace, energy power, machinery and military require key structural parts to have high specific strength and specific stiffness, high hardness, high toughness, wear resistance, corrosion resistance, and high temperature resistance. Therefore, most metal parts have been difficult to meet the practical application. Carbide, boride, nitride and other ceramics have high strength, high modulus and high hardness, and are more wear-resistant, high-temperature and oxidation-resistant than metals, coupled with low density and thermal expansion coefficient, they can replace metal parts for key structures pieces. However, ceramics are mostly composed of ionic bonds or covalent bonds, which are brittle, difficult to process, and poor in electrical and thermal conducti...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622
Inventor 艾桃桃冯小明赵卓玲
Owner SHAANXI UNIV OF TECH
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