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Hard alloy and preparation method thereof

A technology of cemented carbide and hard phase, which is applied in the field of powder metallurgy, can solve the problems of difficult application of wear resistance and good toughness, and the lack of cubic phase gradient structure on the surface of ultra-fine grains. Effects of thermal crack growth ability, excellent wear and oxidation resistance, and excellent toughness

Active Publication Date: 2015-03-11
ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, in the prior art, the overall toughness of the prepared ultra-fine-grain surface layer lacking cubic phase gradient structure cemented carbide is not high, which makes it difficult for the gradient structure cemented carbide to be used in metal cutting that requires both high wear resistance and good toughness field

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  • Hard alloy and preparation method thereof

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Experimental program
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Embodiment 1

[0040] A kind of cemented carbide, is the cemented carbide of gradient structure lacking cubic phase of surface layer, comprises binding phase, hard phase and grain growth inhibitor, and binding phase comprises Co and Ru as strengthening phase; Hard phase is WC and cubic phase compounds, where the cubic phase compounds are TiC, TiN and (Ta,Nb)C; the grain growth inhibitors are VC and Cr 3 C 2 , its specific percentage content is: Co: 8wt.%, Ru: 1.2wt.%, TiC: 0.8wt.%, TiN: 0.4wt.%, TaC: 0.6wt.%, NbC: 0.4wt.%, VC: 0.4wt.%, Cr 3 C 2 : 0.6 wt.%. The balance is WC, and the average particle size of WC is 0.4 μm.

[0041] The preparation method of above-mentioned cemented carbide, comprises the following steps:

[0042] Complete the raw material preparation according to the above ratio, wherein the particle size of Co powder is 0.8 μm, the particle size of Ru powder is 300 mesh, the particle size of TiC, TiN and (Ta, Nb)C is 1.5 μm, VC and Cr 3 C 2The particle size is 1.4 μm, ...

Embodiment 2

[0046] A kind of cemented carbide, is the cemented carbide of gradient structure lacking cubic phase of surface layer, comprises binding phase, hard phase and grain growth inhibitor, and binding phase comprises Co and Ru as strengthening phase; Hard phase is WC and cubic phase compounds, wherein the cubic phase compounds are TiC, TiN and (Ta, Nb)C, and their specific percentages are: Co: 10wt.%, Ru: 1.4wt.%, TiC: 1.4wt.%, TiN : 0.4wt.%, TaC: 2wt.%, NbC: 1wt.%, the balance is WC, and the average particle size of WC is 3μm.

[0047] The preparation method of above-mentioned cemented carbide, comprises the following steps:

[0048] The raw material preparation is completed according to the above ratio, wherein the particle size of Co powder is 0.8 μm, the particle size of Ru powder is 300 mesh, the particle size of TiC, TiN, TaC, and NbC is 1.5 μm, and 2wt.% PEG4000 is added as a forming agent. Carry out ball milling and mixing, dry after ball milling for 25 hours, and then perf...

Embodiment 3

[0053] A kind of cemented carbide, is the cemented carbide of gradient structure lacking cubic phase of surface layer, comprises binding phase, hard phase and grain growth inhibitor, and binding phase comprises Co and Ru as strengthening phase; Hard phase is WC And cubic phase compounds, where the cubic phase compounds are TiC, TiN and (Ta, Nb)C. , its specific percentage content is: Co: 10wt.%, Ru: 1.4wt.%, TiC: 2wt.%, TiN: 0.6wt.%, the balance is WC, and the average particle size of WC is 5 μm.

[0054] A kind of preparation method of above-mentioned cemented carbide, comprises the following steps:

[0055] Complete the raw material preparation according to the above ratio, wherein the particle size of Co powder is 0.8 μm, the particle size of Ru powder is 300 mesh, the particle size of TiC and TiN is 1.5 μm, and 2wt.% PEG4000 is added as a forming agent, and ball milling is carried out in a ball mill. Dry after 25 hours of ball milling. Then carry out compression molding ...

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Abstract

The invention discloses a hard alloy and a preparation method thereof. The hard alloy is a hard alloy adopting a surface layer deficient cubic phase gradient structure; the surface layer deficient cubic phase gradient structure comprises a 4.1-18.75 wt.% bonding phase and a 81.25-95.9 wt.% hard phase; the bonding phase comprises metal and Ru; the content of the mental is 4-15 wt.%; the Ru is dissolved in the metal in a solid manner; the hard phase comprises WC and a cubic phase compound; the content of the Ru in the bonding phase n wt.% and the content of the mental in the bonding phase m wt.% meet the relation that when m is larger than or equal to 4 and less than or equal to 8, n is larger than (0.25m-1) and less than or equal to 0.2 m, and when m is larger than 8 and less than or equal to 15, n is larger than or equal to (0.25m-1.2) and less than or equal to 0.25m. The preparation method comprises the steps of preparation of raw materials, mixing of ball milling, pressing formation and sintering. The prepared hard alloy has the advantages that the hard alloy is high in abrasion resistance, tenacity and high-temperature hardness.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, in particular to a cemented carbide and a preparation method thereof. Background technique [0002] Surface lack of cubic phase (also known as de-β layer) gradient structure cemented carbide refers to adding a certain amount of cubic phase to the raw material powder, such as TiC, TiN or solid solution carbide (Ti, W) C, (Ta, Nb) C Or solid solution carbonitride (Ti, W) (C, N), (Ti, Ta, Nb) (C, N), TiCN, etc., the raw material powder is ball milled and mixed, and pressed into a green compact containing a cubic phase as a whole, after sintering In the stage, by changing the atmosphere in the furnace, a gradient layer of lacking cubic phase is formed on the surface of the substrate with a certain thickness. There is no hard and brittle cubic phase in the lacking cubic phase and the Co content is higher than the average content of the matrix, so it has higher toughness. The graded cemented carbide w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/04
Inventor 魏崇斌谢文王社权瞿峻温光华陈响明
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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