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Superfine WC-Co cemented carbide containing rare-earth elements and preparation method thereof

A technology of cemented carbide and rare earth elements, applied in the field of ultra-fine grain WC-Co cemented carbide and its preparation, to achieve the effects of simple and easy addition, low production cost, easy implementation and production application

Active Publication Date: 2010-06-30
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No single addition of RE or compound addition of VC / RE and Cr in the process of preparing ultrafine-grained WC-Co cemented carbide with WC grain size ≤ 0.5 μm 3 C 2 / RE or VC / Cr 3 C 2 / RE's Patent Coverage

Method used

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  • Superfine WC-Co cemented carbide containing rare-earth elements and preparation method thereof
  • Superfine WC-Co cemented carbide containing rare-earth elements and preparation method thereof
  • Superfine WC-Co cemented carbide containing rare-earth elements and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Ultrafine grain WC-Co cemented carbide containing rare earth elements, the cemented carbide components are: WC hard phase (grain size is 0.25μm), Co binder phase, rare earth additive Y 2 o 3 (Y 2 o 3 particle size 80nm, purity ≥ 99.9%) and grain growth inhibitor Cr 3 C 2 , the weight of the WC hard phase accounts for 86.82% of the cemented carbide, the weight of the Co binder phase accounts for 12% of the cemented carbide, and the grain growth inhibitor Cr 3 C 2 The weight accounts for 1.0% of the cemented carbide, the rare earth additive Y 2 o 3 The weight accounts for 0.18% of the cemented carbide (Y 2 o 3 The weight of Y accounts for 1.18% of the Co binder phase).

[0026] A preparation method for ultrafine-grained WC-Co cemented carbide containing rare earth elements, the method steps are,

[0027] (1) weighing various powder raw materials by weight percentage;

[0028] (2) Put the prepared powder raw materials into a WC-Co cemented carbide tank, use WC-C...

Embodiment 2

[0035] Ultrafine grain WC-Co cemented carbide containing rare earth elements, the cemented carbide components are: WC hard phase (grain size is 0.25μm), Co binder phase, rare earth additive CeO 2 (CeO 2 particle size 50nm, purity ≥ 99.9%) and grain growth inhibitor Cr 3 C 2 , the weight of the WC hard phase accounts for 93.57% of the cemented carbide, the weight of the Co binder phase accounts for 6% of the cemented carbide, and the grain growth inhibitor Cr 3 C 2 The weight accounts for 0.4% of the cemented carbide, the rare earth additive CeO2 The weight accounts for 0.03% of the cemented carbide (CeO 2 The weight of Ce accounts for 0.4% of the Co binder phase).

[0036] A preparation method for ultrafine-grained WC-Co cemented carbide containing rare earth elements, the method steps are,

[0037] (1) weighing various powder raw materials by weight percentage;

[0038] (2) Put the prepared powder raw materials into a WC-Co cemented carbide tank, use WC-Co cemented carb...

Embodiment 3

[0045] Ultrafine-grained WC-Co cemented carbide containing rare earth elements, the cemented carbide components are: WC hard phase (grain size is 0.22 μm), Co binder phase, La 2 o 3 and Sm 2 o 3 The mixed rare earth oxide of composition (the particle size of mixed rare earth oxide is 37nm, purity ≥ 99.9%, mass ratio La 2 o 3 :Sm 2 o 3 =1:1) and grain growth inhibitor VC, the weight of WC hard phase accounts for 89.18% of cemented carbide, the weight of Co binder phase accounts for 10% of cemented carbide, and the weight of grain growth inhibitor VC accounts for 0.7% of cemented carbide, the weight of mixed rare earth oxides accounts for 0.12% of cemented carbide (La 2 o 3 and Sm 2 o 3 The sum of the weights of La and Sm in the composition of the mixed rare earth oxide accounts for 1.03% of the Co binder phase).

[0046] A preparation method for ultrafine-grained WC-Co cemented carbide containing rare earth elements, the method steps are,

[0047] (1) weighing variou...

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Abstract

The invention discloses a superfine WC-Co cemented carbide containing rare-earth elements and a preparation method thereof, belonging to the technical field of cemented carbide. In the cemented carbide, the weight of WC rigid phase accounts for 85-94% of that of the cemented carbide, the weight of Co binder phase accounts for 5-14% of that of the cemented carbide, the weight of grain growth inhibitor accounts for 0.3-2.0% of that of the cemented carbide, and the weight of the thulium in the rare earth addition accounts for 0.2-1.2% of that of the Co binder phase. The method comprises the following steps: weighing various powder stocks, ball-milling, drying and pelletizing to form a compound; and suppressing and shaping the compound, sintering and cooling to obtain the cemented carbide. The adding mode of nano rare earth oxide or Co-RE composite powder can be implemented easily and conveniently, and the rare earth is diffusely and evenly distributed, thereby facilitating to perform physo-chemical reactions; and the cemented carbide has the advantages of low production cost, stable and enhanced performance and easy implementation, production and application.

Description

technical field [0001] The invention belongs to the technical field of hard alloy preparation, and in particular relates to an ultrafine-grained WC-Co hard alloy containing rare earth elements and a preparation method thereof. Background technique [0002] Using WC-Co cemented carbide rotary cutting tools such as PCB micro-drills, milling cutters, and solid drills to process high-temperature alloys, titanium alloys, composite materials, When various thermal spraying (welding) materials, hardened steel, high-alloy cast steel and other difficult-to-machine materials are precision-machined, in addition to requiring WC-Co cemented carbide knives to have high hardness and wear resistance to keep the "sharp corners" sharp, It is also required to have excellent strength and toughness, so that the tool has good impact resistance and "sharp corner" chipping performance during the cutting process, thereby reducing the loss of the tool, improving the reliability of the service life of ...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05
Inventor 林晨光吴冲浒曹瑞军张守全李艳谢海唯
Owner GRIMAT ENG INST CO LTD
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