Preparation method of al2o3/tic coated cemented carbide based on liquid phase sintering process

A cemented carbide, liquid phase sintering technology, applied in the coating, the device for coating liquid on the surface, the surface pretreatment, etc., can solve the problems of complex process and difficult control, and achieve simple process, easy control, and high efficiency. The effect of density and strength enhancement

Inactive Publication Date: 2016-02-10
CHENGDU UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0005] The present invention aims at current Al 2 o 3 In the manufacturing process of TiC-coated cemented carbide, the two coatings are vapor-phase deposited step by step, the preparation of the cemented carbide substrate and the coating treatment are carried out step by step, and the process is complicated and difficult to control. It is proposed to prepare Al by liquid phase method (OH) 3 / Ti(OH) 4 The core / shell structure sol is then spin-coated on the surface of the cemented carbide blank with a density of 85% to 95% after solid-phase sintering to form Al 2 o 3 / TiO 2 layer, and then use the CO atmosphere in the liquid phase sintering process to undergo a carbothermal reduction reaction with the surface layer to make TiO 2 Converted to TiC, and finally produced Al 2 o 3 / TiC coated carbide

Method used

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  • Preparation method of al2o3/tic coated cemented carbide based on liquid phase sintering process

Examples

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example 1

[0019] Example 1: First Al(NO 3 ) 3 Prepare a solution with a volume percentage concentration of 0.8% with deionized water, add ammonia water to adjust the pH value of the solution to 8, stir at 25°C for 2 hours with a magnetic stirrer at a speed of 25 r / mi, and then place it for 8 hours to form Al(OH) 3 Sol; then add TiCl 4 , so that its volume percent concentration is 0.16%, which is equivalent to Al(NO 3 ) 3 20% of the concentration by volume, and add ammonia water to adjust the pH value to 8.2, stir at 50°C for 1h with a magnetic stirrer, and the speed of the magnetic stirrer is 25r / min, and then leave it for 10h to generate Ti(OH) 4 Coated Al(OH) 3 Al(OH) 3 / Ti(OH) 4 core / shell structure sol, Al(NO 3 ) 3 、TiCl 4 and ammonia were of analytical grade. Then weigh various raw material powder ingredients, according to the weight percentage, TiC accounts for 3%, TaC accounts for 2%, NbC accounts for 2%, Co accounts for 10%, and the rest is WC; Drying, mixing in the ...

example 2

[0020] Example 2: First Al(NO 3 ) 3 Prepare a solution with a volume percentage concentration of 3% with deionized water, add ammonia water to adjust the pH value of the solution to 9, stir at 50°C for 5 hours with a magnetic stirrer at a speed of 50 r / mi, and then place it for 10 hours to form Al(OH) 3 Sol; then add TiCl 4 , so that its volume percent concentration is 1.2%, which is equivalent to Al(NO 3 ) 3 40% of the concentration by volume, and add ammonia water to adjust the pH value to 8.4, stir at 70°C for 4 hours with a magnetic stirrer, the speed of the magnetic stirrer is 40r / min, and then place it for 11 hours to generate Ti(OH) 4 Coated Al(OH) 3 Al(OH) 3 / Ti(OH) 4 core / shell structure sol, Al(NO 3 ) 3 、TiCl 4 and ammonia were of analytical grade. Then weigh various raw material powder ingredients, TaC accounts for 3%, Co accounts for 8%, and the rest is WC; the mixed powder is ball milled for 48 hours, dried at 95°C with a 400-mesh screen, and mixed with...

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Abstract

The invention discloses a method for preparing an Al2O3 / TiC coated hard alloy based on a liquid phase sintering process, which is characterized in that the Al(OH)3 / Ti(OH)4 core / shell structure sol is firstly prepared by a liquid phase method , and then spin-coated on the surface of the solid-phase sintered cemented carbide blank with a density of 85% to 95% to form an Al2O3 / TiO2 layer, and then use the CO atmosphere in the liquid-phase sintering process to undergo a carbothermal reduction reaction with the surface layer to make TiO2 Converted to TiC, and finally produced Al2O3 / TiC coated cemented carbide. The process of the invention is simple, easy to control, and avoids the problem of step-by-step vapor deposition of two coatings in the manufacturing process of Al2O3 / TiC coated hard alloy, and the step-by-step problem of coating treatment and substrate preparation, based on liquid phase sintering The process prepares Al2O3 / TiC coated cemented carbide in one step.

Description

technical field [0001] The present invention relates to a kind of preparation method of coated cemented carbide, particularly Al 2 o 3 The invention discloses a preparation method of TiC coated hard alloy, which belongs to the field of powder metallurgy and hard alloy materials. Background technique [0002] Cemented carbide is a multi-phase solid material prepared by powder metallurgy based on refractory transition metal carbides such as WC and TiC, and iron group metals such as Co as binders. Since the invention of WC-6%Co in Germany in 1923, after nearly 90 years of development, cemented carbide has replaced high-speed steel as the most important cutting tool material at present, and is known as "the tooth of industry". In particular, the emergence of coating technology that appeared in the 1970s increased the tool life after coating by 2 to 5 times. Coating one or more layers of metal or non-metallic compound films on the cemented carbide substrate constitutes a coate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/06C22C1/05B05D1/38B05D3/02B05D3/00
Inventor 杨梅龙剑平邱克辉
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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