Method for industrially preparing dimorphic hard alloy with both high strength and high tenacity

A cemented carbide, high toughness technology, applied in the field of cemented carbide, can solve the problems of unreachable transverse fracture strength and fracture toughness of cemented carbide bulk, difficult to control the number and size of coarse WC, and small volume fraction of coarse grains. , to achieve the effects of low production cost, high phase purity and short preparation process

Active Publication Date: 2011-10-12
BEIJING UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

In these preparation methods, the number and size of coarse WC are difficult to control, and the volume fraction of coarse grains is small, which makes the transverse fracture strength and fracture toughness of the cemented carbide block unsatisfactory. Moreover, the preparation The process is cumbersome and the quality is difficult to control

Method used

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  • Method for industrially preparing dimorphic hard alloy with both high strength and high tenacity
  • Method for industrially preparing dimorphic hard alloy with both high strength and high tenacity
  • Method for industrially preparing dimorphic hard alloy with both high strength and high tenacity

Examples

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example 1

[0028] Example 1: The final product is WC-6wt.% Co (YG6) cemented carbide bulk material. with WO 2.9 、Co 3 o 4and carbon black powder as raw materials, according to the requirements of the Co content in the final prepared YG6 twin crystal cemented carbide, the ratio of the three raw materials is carried out and mixed by ball milling, and the powder after ball milling is cold-pressed and sent into a vacuum furnace. The WC-Co composite powder was prepared in a vacuum furnace using the following process parameters: the heating rate was 10°C / min, the holding temperature was 1050°C, and the holding time was 3 hours. The agglomerates of the prepared WC-Co composite powder were crushed by ball milling: using absolute ethanol as the grinding medium, the volume ratio of solid to liquid was 1:3; the ratio of ball to solid was 1:1; the speed of the ball mill was 300r / min; the milling time was 10 hours; after drying, WC-Co composite powder was obtained. The WC-Co composite powder afte...

example 2

[0029] Example 2: The final product is WC-10wt.% Co (YG10) cemented carbide bulk material. with WO 2.9 、Co 3 o 4 and carbon black powder as raw materials, according to the requirements of the Co content in the final prepared YG10 twin crystal cemented carbide, the ratio of the three raw materials is carried out and mixed by ball milling, and the powder after ball milling is cold-pressed and sent into a vacuum furnace. The WC-Co composite powder was prepared in a vacuum furnace using the following process parameters: the heating rate was 8°C / min, the holding temperature was 1100°C, and the holding time was 3.5 hours. The prepared WC-Co composite powder agglomerate is ball milled: hexane is used as the grinding medium, the volume ratio of solid to liquid is 1:2; the ratio of ball to material is 1:1; the speed of the ball mill is 150r / min; the milling time is 15 Hours; WC-Co composite powder was obtained after drying. The WC-Co composite powder after ball milling was subjecte...

example 3

[0030] Example 3: The final product is WC-10wt.% Co (YG10) cemented carbide bulk material. with WO 2.9 、Co 3 o 4 and carbon black powder as raw materials, according to the requirements of the Co content in the final prepared YG10 twin crystal cemented carbide, the ratio of the three raw materials is carried out and mixed by ball milling, and the powder after ball milling is cold-pressed and sent into a vacuum furnace. The WC-Co composite powder was prepared in a vacuum furnace using the following process parameters: the heating rate was 8°C / min, the holding temperature was 1100°C, and the holding time was 3.5 hours. The prepared WC-Co composite powder agglomerates were ball milled and crushed: absolute ethanol was used as the grinding medium, the volume ratio of solid to liquid was 1:2, and the ratio of ball to material was 1:1; the rotational speed of the ball mill was 150r / min; the milling time was 15 hours; WC-Co composite powder was obtained after drying. The WC-Co com...

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Abstract

The invention discloses a method for industrially preparing a dimorphic hard alloy with both high strength and high tenacity, belonging to the technical field of hard alloys. The method comprises the following steps of: according to the content of Co in the dimorphic hard alloy, ball-milling and mixing WO2.9, Co3O4 and carbon black; coldly pressing into a billet block; preparing WC-Co composite powder in a vacuum furnace; ball-milling by taking absolute ethyl alcohol or hexane as a medium; drying to obtain the WC-Co composite powder; under the protection of argon, performing powder aggregation pre-treatment; raising the temperature to 650-950 DEG C at a speed of 5-8 DEG C per minute; keeping the temperature for 30-60 min; adding 30-80 ml of polyethylene glycol forming agent to each kilogram of powder; moulding and forming; and sintering the moulded and formed powder billet in vacuum or at low pressure. The WC-Co dimorphic hard alloy prepared by the invention has both high strength andexcellent breakage tenacity. The method is an integral industrialization preparation technology route.

Description

technical field [0001] The invention relates to an industrialized preparation method of a WC-Co cemented carbide with twin crystal structure and high strength and high toughness, belonging to the technical field of cemented carbide. Background technique [0002] WC-Co cemented carbide is widely used in cutting tools, moulds, mining tools and wear-resistant parts due to its high hardness, wear resistance and transverse fracture strength. As a cermet material, the hardness and fracture toughness of cemented carbide are a pair of contradictions. At present, the preparation of cemented carbide with high hardness and high wear resistance basically achieves the target by sacrificing the fracture toughness of cemented carbide. Cemented carbide with a special twin crystal structure can simultaneously have excellent comprehensive properties such as high strength, high toughness, and high wear resistance, making it show unique advantages in harsh industrial and mining conditions. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/04
Inventor 宋晓艳魏崇斌刘雪梅
Owner BEIJING UNIV OF TECH
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