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Method for preparing superfine WC (wolfram carbide) powdery material

A technology for powder materials and materials, which is applied in the field of preparation of powder materials containing W and C, can solve the problems of reducing efficiency and roughening of products, and achieves the effects of simplifying production equipment, short time and high yield.

Inactive Publication Date: 2013-09-04
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aluminothermic reaction tends to make the product coarser, and long-term ball milling will reduce the efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The present invention is a kind of preparation method of superfine WC powder material, and its steps are:

[0014] (1) Reaction raw materials by mass percentage Mg: 13.24~13.85, WO 3 : 50.53~52.82, C: 5.38~7.85, NaCl: 25.50~26.66, NaCl 2 CO 3 : 1.21~2.96 for batching;

[0015] (2) Put the prepared raw material powder into the ball mill tank, mix in the planetary ball mill for 8~24h, the speed is 50~150r / min, the mass ratio of ball to material is 1:2~1:3, and the ball milling medium is Al 2 o 3 ball;

[0016] (3) Put the uniformly mixed reaction materials in the mold, and press them into a round cake-shaped billet under a pressure of 10-60 MPa on the press; put the igniter tablet at the bottom of the copper crucible in the reaction kettle, and then put the formed billet Put it on the ignition agent; after the reaction kettle is sealed, turn on the heating switch, fill the kettle with 0.5-1.5MPa argon gas, and exhaust it after 10 minutes to remove the air in the kett...

Embodiment 1

[0020] According to mass percentage Mg: 13.59, WO 3 : 51.88, C: 5.38, NaCl: 26.18, Na 2 CO 3 : 2.96 Take each reactant powder respectively, put it into a stainless steel ball mill tank, and ball mill it in a planetary ball mill for 8 hours, the speed is 80r / min, the mass ratio of ball to material is 1:2, and the ball mill medium is Al 2 o 3 ball. The uniformly mixed reaction materials are placed in the mold, and pressed into a round cake-shaped billet under a pressure of 15 MPa on the press; place an ignition agent tablet at the bottom of the copper crucible in the reaction kettle, and then place the round cake-shaped billet on the ignition agent ;After the reactor is sealed, turn on the heating switch of the reactor control cabinet, fill the reaction vessel with 0.5MPa argon, and discharge the gas in the reactor after 10 minutes to remove the air in the reactor; Exhaust, after the pressure indicator is zero, fill in 2MPa argon again; when the temperature in the reacti...

Embodiment 2

[0022] According to mass percentage Mg: 13.50, WO 3 : 51.55, C: 6.0, NaCl: 25.99, Na 2 CO 3 : 2.95 Weigh each reactant powder respectively, put it into a stainless steel ball mill tank, and ball mill it in a planetary ball mill for 12 hours, the rotating speed is 120r / min, the mass ratio of the ball to material is 1:2.5, and the ball milling medium is Al 2 o 3 ball. The uniformly mixed reaction materials are placed in the mold, and pressed into a round cake-shaped billet under the pressure of 25MPa on the press; the igniter tablet is placed at the bottom of the copper crucible in the reaction kettle, and the round cake-shaped billet is placed on the igniter ;After the reactor is sealed, turn on the heating switch of the reactor control cabinet, fill the reaction vessel with 1.0MPa argon gas, and discharge the gas in the reactor after 10 minutes to remove the air in the reactor; Exhaust, after the pressure indicator is zero, fill in 3MPa argon again; when the temperatur...

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Abstract

A method for preparing a superfine WC powdery material comprises the steps as follows: (1), Reactant powder including Mg, WO, C, NaCl, and Na2CO3 is proportioned in a mass ratio of (13.24-13.85): (50.53-52.82): (5.38-7.85): (25.50-26.66): (1.21-2.96); (2), the reactants are placed in a ball mill for uniform mixing; (3), the reactants are placed in a die, and compressed into a cake-shaped blank under the pressure of 10 MPa-60 MPa; an ignition agent tablet is placed at the bottom of a copper crucible in a reaction kettle, and the formed blank is placed on the ignition agent; a heating switch of the reaction kettle is opened, 0.5 MPa-1.5 MPa of argon is introduced into the kettle, and is discharged after 10 min; exhausting is performed again when the temperature rises in a range from 180 DEG C to 200 DEG C, and after that, 1.5 MPa-5 MPa of argon is introduced; and the ignition agent is burned when the temperature in the kettle reaches a range from 270 DEG C to 290 DEG C, a combustion reaction of the reactants is initiated, and at the moment, the heating switch is closed until the reactants are sufficiently converted into a product containing WC blocks; and (4), the product is ground into powder which is subjected to leaching for 48 h-96 h in hydrochloric acid, the WC is separated from a liquid through a suction filtration device, washing is performed, and the superfine WC powdery material is obtained through drying.

Description

technical field [0001] The invention relates to the preparation of powder materials containing W and C. Background technique [0002] M. Sakaki et al. reported their research results in the Journal of Alloys and Compounds (No. 6, 2009), on WO 3 The -C-2Al system is ball milled for a long time under different process conditions, which mechanically induces the combustion reaction of the system. The XRD characterization of the product shows that: gradually adding Al powder during the ball milling process makes the thermite reaction proceed slowly, which reduces the The combustion temperature of the system reduces the loss of carbon, promotes the carbonization reaction of W to proceed fully, and inhibits the 2 Generation of C. However, the aluminothermic reaction tends to make the product coarser, and long-term ball milling will reduce the efficiency. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of superfine WC p...

Claims

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Application Information

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IPC IPC(8): C01B31/34C01B32/949
Inventor 喇培清卢学峰韩少博欧玉静郭鑫魏玉鹏
Owner LANZHOU UNIVERSITY OF TECHNOLOGY