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Rare earth additive for hard alloy and preparation method thereof

A technology of rare earth additives and cemented carbide, which is applied in the field of rare earth additives for cemented carbide and its preparation, can solve the problems of single composition of rare earth additives, uneven distribution of rare earth elements, coarse particle size, etc., and achieve the elimination of uneven distribution, mechanical mechanical The effect of performance improvement and grain refinement

Active Publication Date: 2014-01-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a rare earth additive for cemented carbide and its preparation method, to solve the problems of single rare earth additive composition, uneven distribution of rare earth elements, coarse particle size, and easy oxidation

Method used

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  • Rare earth additive for hard alloy and preparation method thereof
  • Rare earth additive for hard alloy and preparation method thereof
  • Rare earth additive for hard alloy and preparation method thereof

Examples

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Embodiment 1

[0042] Raw materials used in this embodiment: Ce 27.87wt%, binder phase raw material (Co, Mn, Ni) 72.13wt%; said binder phase raw material (Co, Mn, Ni), Co 56.28wt%, Mn 0.1wt% , Ni 15.75wt%.

[0043] The processing steps of the present embodiment:

[0044]After the above-mentioned raw materials are measured according to their weight percentages, they are melted in a vacuum induction melting furnace and cast into rare earth-bonding phase alloy ingots. The pouring temperature is 1380 ° C, and the heat preservation is 5 minutes. The ingots are coarsely broken into alloy blocks smaller than 20mm by a jaw crusher; the alloy blocks formed after the alloy ingots are roughly crushed are placed in a vacuum heating furnace for homogenization and annealing, and the vacuum degree is controlled at 1×10 -1 Pa, the annealing temperature is 1100°C, and the annealing time is 10 hours; the above-mentioned homogenized annealed alloy block is placed in a tubular heat treatment furnace, and the v...

Embodiment 2

[0047] Raw materials used in this embodiment: Sm 16.08wt%, Dy 1.0wt%, binder phase raw materials (Co, Mn, Fe, Cu, Al) 82.92wt%; said binder phase raw materials (Co, Mn, Fe, Cu, In Al), Co 31.21wt%, Mn 11.8wt%, Fe 32.68wt%, Cu 6.09wt%, Al 1.14wt%.

[0048] The processing steps of the present embodiment:

[0049] After the above-mentioned raw materials are measured according to their weight percentages, they are melted in a vacuum induction melting furnace and cast into rare earth-bonding phase alloy ingots. The pouring temperature is 1420 ° C and the heat preservation is 8 minutes. The ingots are coarsely broken into alloy blocks smaller than 20mm by a jaw crusher; the alloy blocks formed after the alloy ingots are roughly crushed are put into an arc remelting quick quenching furnace and vacuumed to 1×10 -2 a, then pass in argon gas with a purity ≥99.99%, control its partial pressure at 0.2MPa, inductively heat and melt under the protection of argon gas, and spray the molten m...

Embodiment 3

[0051] Raw materials used in this embodiment: Pr12.95wt%, La 11wt%, Yb 0.05wt%, binder phase raw material (Co, Mn, Ni, Fe) 76wt%; said binder phase raw material (Co, Mn, Ni, Fe ), Co 50.68wt%, Mn 5.0wt%, Ni 15.24wt%, Fe 5.08wt%.

[0052] The processing steps of the present embodiment:

[0053] After the above-mentioned raw materials are measured according to their weight percentages, they are melted in a vacuum induction melting furnace and cast into rare earth-bonding phase alloy ingots. The pouring temperature is 1370 ° C and the heat preservation is 4 minutes. The ingots are coarsely broken into alloy blocks smaller than 20mm by a jaw crusher; the alloy blocks formed after the alloy ingots are roughly crushed are placed in a vacuum heating furnace for homogenization and annealing, and the vacuum degree is controlled at 6.5×10 -2 Pa, the annealing temperature is 1120°C, and the annealing time is 16h; the alloy block after homogenization annealing is placed in a tubular heat...

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Abstract

The invention discloses a rare earth additive for hard alloy. The rare earth additive for hard alloy is rare earth-binder phase alloy powder with a granularity smaller than 10mum, and the weight percentage of components of the raw materials are as follows: 60-99 percent of binder phase raw material and 1-40 percent of rare earth, wherein the binder phase raw material is formed by Co, Mn and M, and M is at least one out of Ni, Fe, Cr, V, Cu and Al. Two preparation methods are available for the rare earth additive. The first preparation method comprises the steps of casting the binder phase raw material and the rare earth into ingot, smashing the ingot into blocks with size smaller than 20mm, performing homogenizing annealing to the blocks under vacuum condition, or performing rapid quenching to the blocks in an electric-arc remelting rapid quenching furnace to form a rare earth-binder phase alloy thin strip and performing hydrogen absorption, and carrying out ball-milling smashing to the product treated by hydrogen absorption under the protection of argon. The second preparation method comprises the steps of casting the binder phase raw material and the rare earth into ingot, smashing the ingot into blocks with size smaller than 20mm, and performing atomization to the alloy blocks after the alloy blocks are smelted into alloy melts, so as to form atomized powder.

Description

technical field [0001] The invention belongs to the field of hard alloy material preparation, in particular to a rare earth additive for hard alloy and a preparation method thereof. Background technique [0002] In the preparation process of traditional cemented carbide and Ti(C,N)-based cermet materials, problems such as poor wettability and grain growth are prone to occur and deteriorate the mechanical properties of the material. Rare earth additives can inhibit the martensitic transformation of α-Co to ε-C o in the binder phase of WC-Co cemented carbide and Ti(C,N)-based cermet materials, solid solution strengthen the binder phase, and improve the bond Compared with the wettability of the carbide phase, the hard phase structure is refined, the grain boundary and phase boundary are purified, thereby greatly improving the mechanical properties of cemented carbide and Ti(C,N)-based cermet materials. However, due to the high activity of rare earths, their addition form and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/04B22F9/08C22C29/00
Inventor 叶金文刘颖朱刚
Owner SICHUAN UNIV
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