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Method for preparing Co-based high-temperature adhesive hard alloy

A cemented carbide, high temperature technology, applied in the field of high temperature bonding phase cemented carbide preparation, can solve problems such as limiting application and shortening the service life of cemented carbide, achieving high composition control accuracy, process stability and repeatability, The effect of overcoming adverse effects

Inactive Publication Date: 2016-02-24
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its shortcomings such as high temperature softening, high temperature oxidation, and decarburization, the service life of cemented carbide is shortened, and its application at higher temperatures (>800°C) is limited.

Method used

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  • Method for preparing Co-based high-temperature adhesive hard alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) In a vacuum glove box (vacuum degree 0.02MPa), take 88.7% CoCl by mass percentage 2 ·6H 2 O (cobalt chloride hexahydrate), 8.2% AlCl 3 (aluminum chloride) and 3.1% WO 3 (tungsten trioxide) powder; CoCl was mixed with a magnetic stirrer 2 ·6H 2 O, AlCl 3 and deionized water to form a solution with a concentration of 0.36mol / L, and add WO to the solution 3 powder, add concentration of 0.353mol / L (NH 4 ) 2 C 2 o 4 (ammonium oxalate) solution, the temperature of the water bath is 55°C at this time, and stirred for 1.5 hours.

[0027] (2) Filter the solution, and dry it in air at 120° C. for 2.5 hours with a blast drying oven to obtain a precursor powder at a heating rate of 13° C. / min; place the dried powder in a tube furnace (quartz tube, In a tube diameter of 60mm), reduce at 510°C, with a heating rate of 8°C / min, a cooling rate of 15°C / min, and keep warm for 2 hours.

[0028] (3) The reduced powder was high-energy ball milled under the protection of argon ...

Embodiment 2

[0032] (1) Weigh 82.5% CoCl by mass percentage 2 ·6H 2 O, 13.4% AlCl 3 and 4.1% WO 3 powder; CoCl was mixed with a magnetic stirrer 2 ·6H 2 O, AlCl 3 and deionized water to form a solution with a concentration of 0.36mol / L, and add WO to the solution 3 powder, add concentration of 0.375mol / L (NH 4 ) 2 C 2 o 4 (ammonium oxalate) solution, the temperature of the water bath is 55°C, and stirred for 2 hours.

[0033] (2) Filter the solution, and dry it in air at 120°C for 2.2 hours with a blast drying oven to obtain a precursor powder at a heating rate of 13°C / min; place the dry powder in a tube furnace (quartz tube, In a pipe diameter of 60mm), it was reduced at 495°C, with a heating rate of 8°C / min, a cooling rate of 15°C / min, and a heat preservation of 2.5 hours.

[0034] (3) The reduced powder was high-energy ball milled under the protection of argon for 11 hours, the speed of the ball mill was 400 rpm, the materials of the ball and the ball mill were stainless stee...

Embodiment 3

[0038](1) Weigh 86.5% CoCl by mass percentage 2 ·6H 2 O, 12.6% AlCl 3 and 0.9% WO 3 powder; CoCl was mixed with a magnetic stirrer 2 ·6H 2 O, AlCl 3 and deionized water to form a solution with a concentration of 0.36mol / L, and add WO to the solution 3 powder, add concentration of 0.324mol / L (NH 4 ) 2 C 2 o 4 (ammonium oxalate) solution, the temperature of the water bath is 55°C, and stirred for 2 hours.

[0039] (2) Filter the solution, and dry it in air at 120° C. for 2.3 hours with a blast drying oven to obtain a precursor powder at a heating rate of 13° C. / min; place the dried powder in a tube furnace (quartz tube, In a tube diameter of 60mm), reduce at 510°C, with a heating rate of 8°C / min, a cooling rate of 15°C / min, and keep warm for 3 hours.

[0040] (3) The reduced powder was high-energy ball milled under the protection of argon for 12 hours, the speed of the ball mill was 360 rpm, the materials of the balls and the ball mill pot were all stainless steel, th...

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Abstract

The invention discloses a method for preparing Co-based high-temperature adhesive hard alloy. The method comprises the steps that firstly, CoCl2 6H2O, AlCl3 and deionized water are prepared into a solution, and WO3 powder is added to the solution; a (NH4)2C2O4 solution is added to turbid liquid in volume ratio; the solution is filtered and dried to obtain precursor powder; the dried powder is reduced under the hydrogen atmosphere condition; the reduced powder is subjected to high energy ball milling under argon protection to obtain Co-Al-W prealloy powder; WC and Co-Al-W are subjected to high energy ball milling after being matched, vacuum drying is carried out, and ball milling powder is obtained and placed in a mold for cold pressing forming; and a green ware body obtained after cold pressing forming is sintered, and finally a Co-based high-temperature adhesive hard alloy block is obtained. According to the Co-based high-temperature adhesive hard alloy prepared according to the method, the Vickers hardness is larger than or equal to 1,580 / kg mm<-2>, the bending strength is larger than or equal to 4,958 MPa, and the tensile strength at the temperature of 100 DEG C is larger than or equal to 4,376 MPa.

Description

technical field [0001] The invention relates to a preparation method of high-temperature binder phase cemented carbide. Background technique [0002] Cemented carbide is a high-temperature-resistant and wear-resistant material prepared by powder metallurgy technology based on refractory metal hard compounds (WC, TiC, TiN, etc.), using metal as a binder. The excellent comprehensive performance and high cutting processing efficiency of cemented carbide make it widely used in high-speed cutting tools such as high-strength steel and high-quality casting alloys, molds for powder forming and metal plastic processing, impact tools, etc. In response to the current development trend of energy-saving, green and high-efficiency industries in the society, higher requirements are put forward for the comprehensive performance and lifespan of cemented carbide tools and molds, especially in high-end industrial applications such as aerospace, microelectronics, and micromachining. Cemented c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C19/07
CPCC22C1/05C22C19/07
Inventor 董洪峰郭从盛谭宏斌
Owner SHAANXI UNIV OF TECH
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