Preparation method of tungsten carbide/cobalt system porous material

A porous material, tungsten carbide technology, applied in the field of preparation of tungsten carbide/cobalt based porous materials, can solve the problems of uncontrollable pores, uneven pores, rough pore walls, etc., and achieve the effect of controllable pores

Inactive Publication Date: 2011-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous cemented carbide prepared by this method is relatively complicated, and a pore-forming agent needs to be added, the pores are uneven, the pore channel is uncontrollable, the pore wall is not smooth, and the raw materials used are WC powder and cobalt powder, resulting in obvious production costs. improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh tungsten oxide powder, cobalt oxide powder and carbon powder, and make ingredients according to the experimental alloy composition of WC-10Co. The mixture is ball milled on a ball mill at 350 rpm, and the ball milling medium is wet-mixed with alcohol, and the mixture after ball milling is dried; the dried powder is reduced with hydrogen at 1100°C for 3 hours; the WC-10Co composite powder obtained after reduction Mixed with gasoline paraffin solution for granulation, and dried; then the granulated composite powder was molded into compact under the pressure of 300MPa. The compact was degreased in a hydrogen furnace at 380°C. After degreasing, the compact is sintered in a high-temperature and low-pressure sintering furnace at a sintering temperature of 1400 °C for 3 hours and a sintering pressure of 5 MPa. The porosity of the prepared WC-10Co porous material of d25mm×3mm is 45%, and the average pore diameter is 1.9um.

Embodiment 2

[0024] Weigh tungsten oxide powder, cobalt oxide powder and carbon powder, and make ingredients according to the experimental alloy composition of WC-5Co. The mixture is ball-milled on a ball mill at 150 rpm, the ball-milling medium is wet-mixed with alcohol, and the ball-milled mixture is dried. The dried powder was reduced with hydrogen at 800°C for 10 h. The WC-5Co composite powder obtained after reduction was mixed with gasoline paraffin solution for granulation and dried. Then the granulated composite powder is molded into compact under the pressure of 200MPa. The compact was degreased in a hydrogen furnace at 350°C. After degreasing, the compact is sintered in a high-temperature and low-pressure sintering furnace at a sintering temperature of 1300°C for 6 hours and a sintering pressure of 3MPa. The porosity of the prepared WC-5Co porous material of d35mm×5mm is 53%, and the average pore diameter is 3.1um.

Embodiment 3

[0026] Weigh tungsten oxide powder, cobalt oxide powder and carbon powder, and make ingredients according to the experimental alloy composition of WC-20Co. The mixture is ball-milled on a ball mill at 650 rpm, the ball-milling medium is wet-mixed with alcohol, and the ball-milled mixture is dried. The dried powder was reduced with hydrogen at 950°C for 6h. The WC-20Co composite powder obtained after reduction is mixed with gasoline paraffin solution for granulation and dried. Then the granulated composite powder was molded into compact under the pressure of 400MPa. The compact was degreased at 420°C in a hydrogen furnace. After degreasing, the compact is sintered in a high-temperature and low-pressure sintering furnace at a sintering temperature of 1500°C for 1 hour and a sintering pressure of 1 MPa. The porosity of the prepared WC-20Co porous material of d20mm×2mm is 61%, and the average pore diameter is 4.2um.

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Abstract

The invention discloses a preparation method of a tungsten carbide / cobalt system porous material. The preparation method comprises the following steps of: taking tungsten oxide powder, cobalt oxide powder and carbon powder as raw materials; weighing the powder according to a certain proportion, evenly mixing the prepared materials by a ball milling method, then drying the powder and screening; performing reducing treatment on the dried powder in a hydrogen furnace to obtain tungsten carbide / cobalt composite powder; blending the composite powder into a gasoline paraffin solution for granulation; pressing the granulated composite powder by a pressure forming process to form green bodies with a certain shape; and degreasing and putting the green bodies into a high-temperature low-pressure sintering furnace for sintering, and cooling in the furnace to obtain the tungsten carbide / cobalt system porous material. The invention has the characteristics that: (1) the process is simple and pollution-free; and (2) the porous powder metallurgy material prepared by the process has many through holes and smooth hole walls. The porous material prepared by the process can be used for manufacturing originals for filtration, separation, current diversion, current limiting and the like.

Description

technical field [0001] The invention relates to a preparation method of a porous material, in particular to a preparation method of a powder metallurgy tungsten carbide / cobalt series porous material. Background technique [0002] Due to their excellent physical and mechanical properties, porous materials have great application potential in many industrial fields such as aerospace, chemical medicine, energy and metallurgy. Common porous materials include iron-based, copper-based, bronze-based, nickel-based, titanium-based and stainless steel-based, etc. These metal porous materials are widely used in chemical, petroleum and other industries, especially for liquid and gas filtration. Its biggest disadvantage is that its corrosion resistance is relatively poor, and it is not resistant to high temperature, and it needs to add a pore-forming agent during the preparation process, so it is difficult to control the number and size of pores. [0003] As a special metal material, cem...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C1/04C22C29/08
Inventor 肖代红
Owner CENT SOUTH UNIV
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