Alumina/titanium carbide composite powder preparation method

A technology of composite powder and coated powder, which is applied in the field of powder metallurgy, can solve the problems of complex process and unfavorable TiC modification effect, and achieve the effect of simple preparation process and controllable reaction process

Inactive Publication Date: 2015-05-06
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] The present invention is aimed at the TiC existing in the preparation process of Al2O3 / TiC composite powder, which is difficult to form in Al2O3 is uniformly dispersed in the matrix, which is not conducive to fully exerting the modification effect of TiC, and the process is complicated. It is proposed to prepare Al(OH)3 sub>sol, and then use it as the core to coat Ti(OH)4 on the surface, and form Al2O3 / TiO after drying 2 coated powder, and finally the composite powder of TiC coated Al2O3 was manufactured by carbothermal reduction method, which realized TiC in Al Dispersion distribution in 2O3, which can be used in the manufacture of high-performance Al2O3 / TiC composite ceramics

Method used

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  • Alumina/titanium carbide composite powder preparation method

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example 1

[0018] Example 1: First, put C 9 h 21 AlO 3 Add it into deionized water to make a solution with a volume percentage concentration of 0.6%, add ammonia water to adjust the pH value of the solution to 8.5, stir at 28°C for 1.5h with a magnetic stirrer at a stirring speed of 35r / min, and then place it for 4h to form Al(OH) 3 Sol. Then, the TiCl 4 Add Al(OH) 3 sol, make TiCl 4 The volume concentration is 0.15%, which is equivalent to C9 h 21 AlO 3 The volume concentration percentage is 25%, add ammonia water to adjust the pH value of the solution to 8.5, stir with a magnetic stirrer at 70°C for 2h, the stirring speed is 20r / min, and then leave it for 5h, the generated Ti(OH) 4 in Al(OH) 3 Surface coating forms Al(OH) 3 / Ti(OH) 4 Core / shell structure sol. C used 9 h 21 AlO 3 、TiCl 4 and ammonia were of analytical grade. Al(OH) 3 / Ti(OH) 4 The core / shell structure sol was dried in a vacuum drying oven at a drying temperature of 110 °C, a heating rate of 5 °C / min, ...

example 2

[0019] Example 2: First, put C 9 h 21 AlO 3 Add it into deionized water to make a solution with a concentration of 1.7% by volume, add ammonia water to adjust the pH value of the solution to 8, stir with a magnetic stirrer at 25°C for 2h at a stirring speed of 30r / min, and then place it for 3h to form Al (OH) 3 Sol. Then, the TiCl 4 Add Al(OH) 3 sol, make TiCl 4 The volume concentration is 0.68%, which is equivalent to C 9 h 21 AlO 3 The volume concentration percentage is 40%, add ammonia water to adjust the pH value of the solution to 9, stir with a magnetic stirrer at 70°C for 3h, the stirring speed is 40r / min, and then leave it for 6h, the generated Ti(OH) 4 in Al(OH) 3 Surface coating forms Al(OH) 3 / Ti(OH) 4 Core / shell structure sol. C used 9 h 21 AlO 3 、TiCl 4 and ammonia were of analytical grade. Al(OH) 3 / Ti(OH) 4 The core / shell structure sol was dried in a vacuum drying oven at a drying temperature of 95 °C, a heating rate of 6 °C / min, a holding ti...

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Abstract

The present invention discloses a Al2O3 / TiC composite powder preparation method, which is characterized in that C9H21AlO3 is adopted to prepare a Al(OH)3 sol, TiCl4 hydrolysis is adopted to coat Ti(OH)4 on the surface of the Al(OH)3 sol to form a core / shell structure sol, vacuum drying is performed to form Al2O3 / TiO2 coated powder, and a carbon thermal reduction reaction is performed in a high temperature atmosphere furnace in the presence of a CO atmosphere, such that the TiO2 coated on the powder surface is subjected to a carbon thermal reduction reaction so as to be converted into TiC to prepare the Al2O3 / TiC composite powder. With the method, the problem that the TiC is difficultly subjected to uniform dispersion in the Al2O3 substrate in the Al2O3 / TiC composite powder preparation is overcome, the modification effect of the TiC is easily and completely provided, and the process is simple.

Description

technical field [0001] The present invention relates to a kind of preparation method of composite powder, especially Al 2 o 3 The invention discloses a method for preparing TiC / TiC composite powder, which belongs to the field of powder metallurgy. Background technique [0002] al 2 o 3 It has excellent characteristics such as high hardness, high strength, wear resistance, corrosion resistance and high temperature resistance, and is the most widely used structural ceramic material. However, its low fracture strength, poor thermal shock resistance and creep resistance, these shortcomings limit its wider application. Currently, in Al 2 o 3 Doping materials such as interstitial compounds (such as TiC, TiN and Ti(C,N)) in the matrix is ​​to improve the Al 2 o 3 An effective method for the mechanical properties of ceramics. Since TiC has a high melting point (3067°C) and high hardness (HV=2800), in Al 2 o 3 Dispersion of TiC doped in ceramics to Al 2 o 3 Al can not on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/56C04B35/626
Inventor 杨梅龙剑平邱克辉
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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