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Cemented tungsten carbide alloy material with gradient cobalt content

A technology of cobalt content and tungsten carbide, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of increased manufacturing cost and poor mechanical properties

Active Publication Date: 2012-10-03
SEED TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such levels of porosity significantly affect the mechanical properties of the material. To eliminate residual porosity, by utilizing high pressure consolidation methods such as hot isostatic pressing (HIP) or rapid omnidirectional shrinkage (ROC), although these high pressure processes fully densify material, but it also brings an increase in manufacturing cost. In addition, the mechanical properties of the material cannot be well improved

Method used

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  • Cemented tungsten carbide alloy material with gradient cobalt content
  • Cemented tungsten carbide alloy material with gradient cobalt content
  • Cemented tungsten carbide alloy material with gradient cobalt content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Raw material ratio: the percentage of the total cemented carbide mass.

[0052] WC 90%

[0053] Co 9.7%

[0054] TaC 0.3%,

[0055] 1. To prepare the mixture, mix 35Kg of the above raw materials with a ball ratio of 4:1, wine material 250ml / Kg, and ball mill for 30 hours. The raw materials are graded, with coarse grade: 85%, medium grade: 10%, and fine grade: 5%.

[0056] 2. The size of the sample block is 7X5.5X25mm, and it is pressed by a hydraulic press, and the pressure of the sample block is 5MPa.

[0057] 3. The sintering temperature after pressing is 1450°C, and H is added during sintering. 2 1.0m 3 / h, keep warm at 1400°C for 30 minutes during sintering, keep warm for 30 minutes at 1500°C, and then cool down. Cemented carbide with graded cobalt content is obtained.

[0058] The change curve of the hard alloy from the surface cobalt content that is WC-Co9% to the middle layer cobalt content that is WC-Co 16% cobalt content accounts for the total cobalt elem...

Embodiment 2

[0060] Raw material ratio: the percentage of the total cemented carbide mass.

[0061] WC 90%

[0062] Co 9.9%

[0063] TaC 01%,

[0064] 1. To prepare the mixture, mix 35Kg of the above raw materials with a ball ratio of 4:1, wine material 250ml / Kg, and ball mill for 30 hours. The raw materials are graded, with coarse grade: 75%, medium grade: 15%, and fine grade: 5%.

[0065] 2. The size of the sample block is 7X5.5X25mm, and it is pressed by a hydraulic press, and the pressure of the sample block is 12MPa.

[0066] 3. The sintering temperature after pressing is 1400°C, and H is added during sintering. 2 1.0m 3 / h, keep warm at 1400°C for 30 minutes during sintering, keep warm for 30 minutes at 1500°C, and then cool down. Cemented carbide with graded cobalt content is obtained.

[0067] Some embodiments of the present invention graded cobalt cemented tungsten carbide materials may be used in the manufacture of cutting tools. In particular, tools that may be used for m...

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Abstract

The invention provides a tungsten carbide-cobalt hard alloy with gradient cobalt content, comprising the following components: 75-90wt% of WC and 6-15wt% of Co, wherein cobalt content is progressively increased from the surface of the hard alloy to the center of the hard alloy. The hard alloy disclosed by the invention has high wearability and high toughness. The invention also provides a preparation method of the tungsten carbide-cobalt hard alloy with the gradient cobalt content.

Description

technical field [0001] The invention relates to the field of cemented carbide, in particular to a tungsten carbide-cobalt cemented carbide with gradient cobalt content. Background technique [0002] Cemented carbide is an alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which basically remain unchanged even at a temperature of 500°C , It still has high hardness at 1000 °C. Cemented carbide is widely used as tool material, such as turning tools, milling cutters, planers, drills, boring tools, etc., for cutting cast iron, non-ferrous metals, plastics, chemical fibers, graphite, glass, stone and ordinary steel, and can also be used for cutting Difficult-to-machine materials such as heat-resistant steel, stainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C23C8/64
Inventor 王玉鹏张帆
Owner SEED TECH CORP LTD
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