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Method for quickly preparing gradient cemented carbide by adding rare-earth elements

A technology of cemented carbide and rare earth elements, applied in the field of cemented carbide material manufacturing, can solve the problem of adding few alloy members

Active Publication Date: 2015-03-04
株洲金韦硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, little research has been done on the addition of alloy group members to gradient alloys

Method used

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  • Method for quickly preparing gradient cemented carbide by adding rare-earth elements
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  • Method for quickly preparing gradient cemented carbide by adding rare-earth elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] step one

[0057] Configuration of carbon-poor cemented carbide powder containing rare earth elements: in the carbon-poor cemented carbide powder containing rare earth elements, it includes by mass percentage:

[0058] WC powder 87.5%; Co powder 6%; W powder 6%; rare earth oxide Y 2 o 3 , wherein Y accounts for 0.5% of the total mass of the carbon-poor cemented carbide powder containing rare earth elements; the total content of carbon in the carbon-poor cemented carbide powder containing rare earth elements is 5.22wt.%; the rare earth element Y is by Y 2 o 3 obtained after reduction; the particle size of the WC powder is 2 μm; the particle size of the Co powder is 2.0 μm; the particle size of the W powder is 1.5 μm; the Y 2 o 3 The particle size of the powder is 1.5μm; the preparation process is as follows: the prepared WC powder, Co powder, W powder, Y powder 2 o 3 Dry mill for 2 hours, mix well, in order to make Y 2 o 3 Reduction to Y, heating in a hydrogen a...

Embodiment 2

[0075] Other conditions are completely consistent with embodiment 1, just the rare earth element is changed into La, and its content is 0.7wt%, and Y 2 o 3 changed to La 2 o 3 , reducing La 2 o 3 The temperature is 1050°C, the heating time is 40 minutes, and the carburizing temperature is 1450°C; the specific test items and test results are shown in Table 3

[0076] table 3

[0077]

Embodiment 3

[0084] Other conditions are exactly the same as in Example 1, except that the rare earth element is replaced by Ce, and its content is 0.6wt%, and Y 2 o 3 replaced by CeO 2 , reducing CeO 2 The temperature is 1100°C, the heating time is 30 minutes, the forming pressure is 300MPa, and the carburizing temperature is 1460°C; the specific test items and test results are shown in Table 5.

[0085] table 5

[0086]

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Abstract

The invention discloses a method for quickly preparing gradient cemented carbide by adding rare-earth elements, and belongs to the field of manufacturing cemented carbide materials. The method disclosed by the invention comprises the following steps: pressing and forming carbon-poor cemented carbide powder containing rare earth, and performing vacuum sintering to obtain a carbon-poor presintering base body; performing carburizing treatment for 40-120 minutes at the temperature of 1,400-1,460 DEG C under the hydrogen atmosphere to obtain the gradient cemented carbide, wherein the thickness of a gradient layer of the gradient cemented carbide is 200-3000 [mu]m. The rare-earth elements are added in the process of preparing the gradient cemented carbide, so that alloying components are solidified and dissolved in a Co phase in the presintering process, and the effect of inhibiting crystal grains from growing can be achieved. But in the carburizing process, the influence of adding the rare earth on the dissolution and the separation of WC (wolfram carbide) in the Co phase is weakened, and more passages are provided for the diffusion of activated carbon, so that the thickness of the gradient layer of the alloy can be quickly increased.

Description

technical field [0001] The invention discloses a method for rapidly preparing gradient hard alloy by adding rare earth elements, and belongs to the field of hard alloy material manufacturing. Background technique [0002] Cemented carbide is a composite tool material prepared by powder metallurgy with refractory metal compounds (WC, TaC, TiC, NbC, etc.) as the matrix and transition metals (Co, Ni, Fe) as the binder phase. Due to its high strength, high hardness, high elastic modulus, wear resistance, corrosion resistance and other advantages, it plays an important role in metal cutting, wood processing, mining drilling and other aspects. Generally, carbides play an important role in the hardness and wear resistance of the alloy, while bonding has an important impact on the strength and toughness of the alloy. Generally speaking, increasing the WC grain size or increasing the Co content will increase the thickness of the binder phase of the alloy and improve the plasticity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C29/08
Inventor 刘咏李晓峰周建华付坤梁宵鹏吕信群韦伟杜萌
Owner 株洲金韦硬质合金有限公司
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