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Molybdenum-based material used for hot extrusion die and surface carburizing treatment technology

A hot extrusion die, molybdenum-based technology, applied in the field of hot extrusion and surface treatment, powder metallurgy, can solve the problems of poor toughness, surface corrosion, bursting, etc., achieve good creep resistance, excellent lubrication performance, improve the use of The effect of longevity

Inactive Publication Date: 2015-08-26
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the hot extrusion die made of hot work die steel to collapse, deform, pull grooves, burst, surface corrosion and other phenomena, resulting in die failure
Cemented carbide and ceramic materials have a hardness of about HV1000, but due to their high hardness and poor toughness, they are prone to cracks and are scrapped under the action of high temperature and high pressure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Get molybdenum powder 60%, tungsten carbide powder 32%, cobalt powder 8%, carbon powder accounts for 0.1% of the total mass of molybdenum powder, tungsten carbide powder, cobalt powder, ball mills 20 hours with the speed of 300 rev / min in ball mill to make powder Mix evenly, and then use the pre-made mold to cold press on a 200MP isostatic press, put it into a vacuum sintering furnace for pressure sintering (sintering temperature 1400°C-1500°C, pressure 10MPa), after polishing the surface and working belt, Then carry out surface carburizing treatment, the carburizing thickness is 10μm, and then carry out mold assembly, and test the mold on the extruder, repair the mold appropriately according to the situation of the mold test, and finally put it into production and application.

Embodiment 2

[0013] Get molybdenum powder 80%, titanium carbide powder 15%, cobalt powder 5%, carbon powder accounts for 0.05% of the total mass of molybdenum powder, titanium carbide powder, cobalt powder, ball mills 24 hours with the speed ball mill of 350 rpm in ball mill to make powder Mix evenly, and then use the pre-made mold to cold press on a 200MP isostatic press, put it into a vacuum sintering furnace for pressure sintering (sintering temperature 1400°C-1500°C, pressure 10MPa), after polishing the surface and working belt, Then carry out surface carburizing treatment, the carburizing thickness is 8μm, then carry out mold assembly, and test the mold on the extruder, repair the mold appropriately according to the situation of the mold test, and finally put it into production and application.

Embodiment 3

[0015] Get 75% charcoal powder (particle size is below 100 orders), 13% anhydrous sodium carbonate, 12% sodium acetate, carry out mixing with 60 rev / min rotating speed ball mills two hours on ball mill, carburizing agent and carburizing agent After the carbon parts are placed in the sealed box, the temperature is raised to 1000 °C at a heating rate of 6 °C / min and then kept for 10 hours. After carburizing, the carburized parts are taken out and heated to 1000°C for 2 hours for water quenching, and then the surface of the working part of the carburized parts is polished, and then the mold assembly test is carried out, and finally put into actual production.

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PUM

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Abstract

The invention relates to a formula of a molybdenum-based material and a molybdenum-based material surface carburizing treatment technology. The molybdenum-based material comprises, by weight, 60-80% of molybdenum, 15-32% of carbide and 2-12% of cobalt, and carbon accounts for 0.01-0.1% of total mass of the molybdenum, the carbide and the cobalt. According to the molybdenum-based material surface carburizing treatment technology, charcoal dust, anhydrous sodium carbonate and sodium acetate with the mass percents being 65-80%, 10-20% and 5-15% respectively serve as carburizing agents, the granularity of the charcoal dust is smaller than 100 meshes, the carburizing temperature ranges from 900 DEG C to 1100 DEG C, heat-preserving time ranges from 8 hours to 10 hours, and a layer of compact molybdenum carbide is formed on the surface of the material to protect the material. After carburizing of the material, the surface hardness HV of the material can be as high as 900, the core hardness HV of the material is only about 530, the service life of a die is greatly prolonged, quick extrusion can be achieved, cost is reduced, and production efficiency is improved.

Description

technical field [0001] The invention relates to the formulation of molybdenum-based materials and the technology of surface carburizing treatment of molybdenum-based materials, and belongs to the fields of powder metallurgy, hot extrusion and surface treatment. Background technique [0002] At present, hot work die steel is usually used as die material in the hot extrusion industry at home and abroad. my country mainly uses 3Cr2W8V steel, while Britain, the United States, the Soviet Union, and Sweden use H13\4Cr5MoVSi steel or other basic steel to make dies. Hot extrusion dies are used under severe conditions such as high temperature, high pressure, wear and thermal fatigue, and the service conditions are very harsh. For example: 20Cr and other materials, the heating temperature is 1150 ~ 1200 ℃, forming on the hydraulic press, the temperature of the mold can reach 900 ~ 950 ℃, due to high pressure forming, the larger the extruded part, the deeper the processing depth (espec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C32/00C22C1/05C23C8/64
Inventor 张聚国钟建华钟奇余向阳
Owner JIANGXI UNIV OF SCI & TECH