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Functionally gradient hard alloy with cubic phase-rich surface and preparation method thereof

A cemented carbide and functionally graded technology, which is applied in the field of functionally graded cemented carbide and functionally graded cemented carbide combined with wear resistance and toughness, can solve the problems of inconvenient industrial production and complicated process, and achieve easy technology transformation, The effect of simple equipment and improved wear resistance

Inactive Publication Date: 2012-07-04
CHONGQING UNIV OF ARTS & SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN101545058 discloses a method for preparing WC-Co gradient cemented carbide by layered pressing and hydrogen atmosphere sintering. The process is complicated and not convenient for industrial production

Method used

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  • Functionally gradient hard alloy with cubic phase-rich surface and preparation method thereof
  • Functionally gradient hard alloy with cubic phase-rich surface and preparation method thereof
  • Functionally gradient hard alloy with cubic phase-rich surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of a functionally graded cemented carbide with a gradient layer thickness of about 5 μm

[0032] 1. Prepare tungsten carbide (WC), compound carbide ((Ti, W)C) and cobalt (Co) into powder according to the mass percentage of 79WC-15TiC-6Co, and add grinding balls according to the ball-to-material ratio of 4:1. Ball milled in absolute ethanol for 48 hours, then sieved and dried.

[0033] 2. Add SBS rubber molding agent (styrene-butadiene-styrene triblock copolymer thermoplastic elastomer) in the proportion of 110 mL / Kg to the mixed powder, sieve and granulate after drying.

[0034] 3. Press the powder into a Type B sample (20×6.5×5.25 mm) on a 20 t manual press.

[0035] 4. Put the sample into a sintering furnace with controllable atmosphere, carry out degumming treatment below 600 ℃, then raise the temperature (5 ℃ / min) to the solid-phase sintering temperature (1250 ℃), keep it warm for 1 hour, and keep it below 10 Pa The vacuum degree; then slowl...

Embodiment 2

[0043] Example 2: Preparation of a functionally graded cemented carbide with a gradient layer thickness of about 7 μm

[0044] 1. The tungsten carbide (WC), compound carbide ((Ti, W)C), titanium carbonitride (Ti(C, N)), cobalt (Co) according to 73WC-14TiC-5Ti(C, N)- The mass percentage of 8Co is formulated into powder, and balls are added according to the ball-to-material ratio of 4:1, ball milled in absolute ethanol for 48 hours, then sieved and dried.

[0045] 2. Add SBS rubber molding agent (styrene-butadiene-styrene triblock copolymer thermoplastic elastomer) to the mixed powder at a ratio of 90 mL / Kg, sieve and granulate after drying.

[0046] 3. Press the powder into a Type B sample (20×6.5×5.25 mm) on a 20 t manual press.

[0047] 4. Put the sample into a sintering furnace with controllable atmosphere, carry out degumming treatment below 600 ℃, then raise the temperature (8 ℃ / min) to the solid-phase sintering temperature (1200 ℃), keep it warm for 1 hour, and keep it b...

Embodiment 3

[0048] Example 3: Preparation of a functionally graded cemented carbide with a gradient layer thickness of about 12 μm

[0049] 1. The tungsten carbide (WC), compound carbide ((Ti, W)C), titanium carbonitride (Ti(C, N)), cobalt (Co) according to 67WC-16TiC-7Ti(C, N)- The mass percentage of 10Co is formulated into powder, and balls are added according to the ball-to-material ratio of 4:1, ball milled in absolute ethanol for 48 hours, then sieved and dried.

[0050] 2. Add SBS rubber molding agent (styrene-butadiene-styrene tri-block copolymer thermoplastic elastomer) to the mixed powder at a ratio of 95 mL / Kg, sieve and granulate after drying.

[0051] 3. Press the powder into a Type B sample (20×6.5×5.25 mm) on a 20 t manual press.

[0052] 4. Put the sample into a sintering furnace with controllable atmosphere, carry out degumming treatment below 600 ℃, then raise the temperature (7 ℃ / min) to the solid-phase sintering temperature (1230 ℃), keep it warm for 1 hour, and keep i...

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Abstract

The invention discloses a functionally gradient hard alloy with a cubic phase-rich surface and a preparation method thereof, and belongs to the technical field of preparation of gradient materials through surface nitriding treatment. A gradient layer of the hard alloy comprises a surface layer rich in cubic phases, and a transition layer rich in binding phases under the surface layer; and the wear resistance and toughness of the alloy can be improved simultaneously, and the alloy can be used for machining metals. In the preparation method, the functionally gradient hard alloy is prepared by anitriding and sintering process; and by controlling the sintering temperature, sintering time and a nitrogen pressure parameter, the components and thickness of the gradient layer of the alloy are controlled. The invention has the advantages that: the conventional equipment and process are not changed greatly, and the functionally gradient hard alloy can be produced; and the invention is suitablefor industrial production.

Description

technical field [0001] The invention relates to a functionally graded cemented carbide with a surface rich in cubic phase, which belongs to the technical field of surface nitriding heat treatment, and in particular provides a functionally graded cemented carbide combining wear resistance and toughness. Background technique [0002] Cemented carbide is mainly composed of hard phase and binder phase. The structure of traditional cemented carbide is uniformly distributed. The characteristics of its main components determine the main properties of cemented carbide, such as the relationship between hardness and strength, wear resistance and toughness. There are contradictions, and it is difficult to resolve them at the same time. With the continuous development of modern industrial technology, the requirements for cemented carbide products are also increasing, and different parts need to have different properties. Functionally graded cemented carbide can solve this problem well....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C29/00C23C8/24
Inventor 陈巧旺蒋显全涂铭旌
Owner CHONGQING UNIV OF ARTS & SCI
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