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A kind of carburizing method of cemented carbide

A cemented carbide and carburizing technology, applied in metal material coating process, solid-state diffusion coating, coating, etc., can solve the problems of sintering furnace damage, environmental pollution, and insignificant carburizing effect, and achieve low production cost , the effect of short process

Active Publication Date: 2021-03-16
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the carburizing method of cemented carbide products generally adopts the filler method to complete carburizing in a vacuum furnace. When the sintering process is vacuumed, the graphite powder with a lower density will be distributed into the furnace or even the vacuum pipe, resulting in the sintering furnace Damaged, and will be emitted into the air, polluting the environment; at the same time, under the vacuum state at the sintering temperature, the carbon atmosphere in the carburizing process is not well controlled, and the carburizing effect is not significant, which increases the defective rate of cemented carbide after carburizing

Method used

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  • A kind of carburizing method of cemented carbide
  • A kind of carburizing method of cemented carbide
  • A kind of carburizing method of cemented carbide

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Experimental program
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Effect test

Embodiment 1

[0028] Cemented carbide decarburized products, parameters: brand YG8.2, size 320mm×12mm×4mm, metallographic microstructure with decarburization η phase (E50) strip 196kg, hard alloy metallographic diagram see figure 2 .

[0029] The invention provides a kind of carburizing method of cemented carbide, comprising the following steps:

[0030] (1) Place each decarburized hard alloy product in a square graphite boat, fill it with graphite particles (φ0.5-3.0mm), and cover it with a graphite cover to form a sealed graphite boat space;

[0031] (2) Put the sealed graphite boat into the integrated dewaxing and sintering furnace and directly heat up to the sintering temperature of 1410°C under a vacuum atmosphere. At this time, fill in argon, the pressure of the argon is kept at 50±10mbar, and the holding time is 30min. After the heat preservation is over, cool down to room temperature with the furnace;

[0032] (3) After the carburizing and sintering is completed, the cemented car...

Embodiment 2

[0035] Cemented carbide decarburized products, parameters: 24 cylinders with grade YG8, size φ30mm×20mm, metallographic microstructure with decarburized η phase (E14), see the metallographic diagram of hard alloy Figure 4 .

[0036] The invention provides a kind of carburizing method of cemented carbide, comprising the following steps:

[0037] (1) Place each piece of hard alloy decarburized product in a circular graphite boat, fill it with graphite particles (φ0.5~3.0mm), and cover it with a graphite cover to form a sealed graphite boat space ;

[0038] (2) Put the sealed graphite boat into the dewaxing and sintering integrated furnace, take other cemented carbide products, and heat up to the sintering temperature of 1390°C. At this time, fill with argon, the argon pressure is kept at 50±10mbar, and the holding time After the heat preservation is over, cool down to room temperature with the furnace;

[0039] (3) After the carburizing and sintering is completed, the cement...

Embodiment 3

[0042] Hard alloy decarburized products, parameters: brand is YG8.2, size 30 products with decarburized η phase (E06) in the metallographic microstructure, the metallographic diagram of the cemented carbide is shown in Figure 6 .

[0043] The invention provides a kind of carburizing method of cemented carbide, comprising the following steps:

[0044] (1) Place each piece of hard alloy decarburized product in a square graphite boat, fill it with graphite particles (φ0.5-3.0mm), and cover it with a graphite cover to form a sealed graphite boat space;

[0045](2) Put the sealed graphite boat into the pressure sintering furnace and directly heat up to the sintering temperature of 1370°C under vacuum atmosphere. At this time, argon gas is filled, and the pressure of the argon gas is kept at 50 bar for pressure sintering. The holding time is 90min. After the heat preservation is over, cool down to room temperature with the furnace;

[0046] (3) After the carburizing and sinteri...

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Abstract

The invention discloses a carburization method for hard alloy, and belongs to the field of hard alloy manufacturing. A dewaxing and sintering integrated furnace or a pressure sintering furnace insteadof a molybdenum wire hydrogen sintering furnace is adopted to perform carbusintering, the density of graphite particles is large, and therefore the graphite particles are not likely to be diffused into a hearth or even a vacuum pipeline in the carbusintering process to damage a sintering furnace pipeline or not diffused into air to pollute environment; the graphite particles can be easily separated from hard alloy decarburization products, and are not likely to be stuck on the surface of the hard alloy, and production efficiency is improved; a graphite boat is sealed with a graphite cover plate to further prevent the graphite particles from being diffused into the hearth or even the vacuum pipeline, meanwhile, the graphite cover plate plays a vital role in controlling carbon atmosphere inthe carburization process, carburization treatment is effectively carried out on the hard alloy decarburization products, defects of hard alloy decarburization are eliminated by introducing argon into the dewaxing and sintering integrated furnace or the pressure sintering furnace and controlling certain pressure, the working procedure is short, and the production cost is low.

Description

technical field [0001] The invention belongs to the field of cemented carbide manufacture, and in particular relates to a carburizing method of cemented carbide. Background technique [0002] Carbon content is a key factor affecting the performance of cemented carbide, and slight fluctuations in carbon content will cause changes in the phase composition and microstructure of the alloy, thereby affecting the performance of the alloy. When the carbon content in the alloy is insufficient, the decarburized structure phase is prone to appear, which is brittle and unstable, which will lead to a decrease in the strength of the alloy; when the carbon content in the alloy is high, free graphite will appear inside, and the existence of graphite destroys the alloy. The continuity of the matrix has a certain splitting effect, which has an adverse effect on the strength, toughness and wear resistance of the alloy. [0003] Factors such as mixture preparation, glue mixing, brushing and s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/64B22F3/24
CPCB22F3/24B22F2003/241B22F2003/248C23C8/64
Inventor 江丙武李强谢皓
Owner ZHUZHOU HARD ALLOY GRP CO LTD