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Method for preparing high-performance WC/MgO nano composite material

A nano-composite material and nano-composite technology, applied in the field of preparation of high-performance WC/MgO nano-composite materials, can solve problems such as sacrificing toughness and decreasing hardness

Inactive Publication Date: 2008-07-30
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The hardness and toughness of traditional composite materials are a pair of contradictory bodies that restrict each other. When the hardness increases, the toughness will be sacrificed; when the toughness increases, the hardness will decrease.

Method used

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  • Method for preparing high-performance WC/MgO nano composite material
  • Method for preparing high-performance WC/MgO nano composite material
  • Method for preparing high-performance WC/MgO nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 0.1 mol of WC with a particle size of 1 μm and 0.1 mol of MgO powder with a particle size of 5 μm, and put them into a ball mill jar; add stearic acid with a mass percentage of 3%; ball; the ball mill jar is sealed and evacuated, and then filled with argon; the ball mill jar is installed on the planetary ball mill, and the outer cover is covered, and the ball mill is continuously ball milled for 50 hours at 250r / min to obtain a powder particle size of 80nm WC / MgO nano-composite powder; dry the obtained WC / MgO nano-composite powder in a vacuum oven, put it into a mold, and cold press it; then put the compact into a spark plasma sintering equipment for sintering, and the sintering system is: 1510°C, the heating rate is 80°C / min, the sintering pressure is 48MPa, and the sintering temperature and sintering pressure are kept for 3 minutes, and the ultrafine WC / MgO nanocomposite powder can be prepared, and SEM, TEM and performance tests are carried out on it .

Embodiment 2

[0028] Mix 0.3 mol of WC with a particle size of 3 μm and 0.5 mol of MgO powder with a particle size of 4 μm, and put it into a ball mill jar; add 0.5% stearic acid in a mass percentage; Put the ball into the grinding ball; seal the ball mill tank, vacuumize it, and then fill it with argon; install the ball mill tank on the planetary ball mill, cover the outer cover, and continue ball milling at 500r / min for 70 hours to obtain powder particles WC / MgO nanocomposite powder with a diameter of 150nm; the obtained WC / MgO nanocomposite powder is dried in a vacuum drying oven and then put into a mold for cold pressing; then the compact is put into a spark plasma sintering device for sintering, The sintering system is as follows: the sintering temperature is 1530°C, the heating rate is 100°C / min, the sintering pressure is 49MPa, and the ultrafine WC / MgO nanocomposite powder can be prepared by keeping the temperature and pressure for 4 minutes. SEM, TEM and performance testing.

Embodiment 3

[0030] Mix 0.1 mol of WC with a particle size of 5 μm and 0.3 mol of MgO powder with a particle size of 1 μm, and put it into a ball mill jar; add stearic acid with a mass percentage of 2%; ball; the ball mill jar is sealed and evacuated, and then filled with argon; the ball mill jar is installed on the planetary ball mill, and the outer cover is covered, and the ball mill is continuously ball milled at 450r / min for 62 hours to obtain a powder particle size of 150nm WC / MgO nano-composite powder; dry the obtained WC / MgO nano-composite powder in a vacuum oven, put it into a mold, and cold press it; then put the compact into a spark plasma sintering equipment for sintering, and the sintering system is: 1520°C, the heating rate is 90°C / min, the sintering pressure is 52MPa, and the sintering temperature and sintering pressure are kept for 5 minutes to prepare ultrafine WC / MgO nanocomposite powder, and conduct SEM, TEM and performance tests on it .

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Abstract

The invention relates to a method for preparing WC / MgO composites with high performance, which comprises: (1) 1 to 5Mum micron of WC and MgO are mixed according to quality ratio of 4:1 to 20:1; (2) quality percentage of 0.5 to 5 percent of stearic acid is added so as to prevent powder from bonding on a tank wall and a milling ball, thus promoting discharging rate of the powder; (3) a ball material rate is 4:1 to 10:1; (4) a ball milling tank is vacuumized and inert gas is led in; (5) continuous ball milling is carried out at the rotating speed of 100 to 500r / minute for 0 hour to 70 hours to obtain WC / MgO nano-composite powder; (6) the obtained powder is dried, cooled, pressed and formed; (7) pressed blank is put into a sintering device of discharge plasma to carry out sintering and the temperature is maintained for 3 to 5 minutes. The method has a simple process, low cost, less investment and high yield; besides, the manufactured powder has fine grain sizes as well as relatively high hardness and toughness and the performance is as excellent as WC / CO composite ceramic; the MgO successfully replaces the rare and noble metal Co and the invention is applicable to industrial production.

Description

technical field [0001] The invention belongs to the field of composite nanometer material preparation, in particular to a preparation method of high-performance WC / MgO nanometer composite material. Background technique [0002] Compared with other composite ceramics and refractory metals, tungsten carbide (WC) has a series of excellent physical and mechanical properties such as high hardness, certain plasticity and good wettability with molten metals. It is widely used in metallurgy, machinery and other departments. It occupies a very important position in modern industry. Cobalt (Co) has good wettability to WC, and WC has a certain solubility in Co, so Co has been the main binder of composite ceramics for many years. However, Co is a precious and rare resource with important strategic significance. China's Co ore resources are poor and scattered, with low grade and high mining cost. At present, my country needs to import a large amount of Co ore every year. The import of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/645C04B35/56
Inventor 朱世根张梅琳季诚昌狄平
Owner DONGHUA UNIV
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