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Preparation method for cemented carbide gradient drill point dies having super coarse grains

A cemented carbide, coarse-grained technology, applied in the field of cemented carbide, can solve the problems of composition diffusion, difficult control of product performance consistency, and great differences in diffusion conditions, so as to improve impact resistance, stable product performance, and resistance to Good impact performance

Active Publication Date: 2017-05-31
XINJINGRUI TUNGSTEN STEEL (XIAMEN) CO LTD
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Problems solved by technology

The disadvantage is that the composition gradient is used to obtain composite cemented carbide products. During the sintering process, composition diffusion due to concentration gradients will occur. Subtle process differences will lead to large differences in diffusion conditions, resulting in difficulty in controlling the consistency of final product performance.

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  • Preparation method for cemented carbide gradient drill point dies having super coarse grains

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Embodiment Construction

[0016] The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0017] Please refer to figure 1 , Ultra-coarse grain cemented carbide gradient drill tail die is divided into top layer 1 and bottom layer 2. A preparation method of ultra-coarse-grained cemented carbide gradient drill tail die includes the following steps:

[0018] (1) Prepare the bottom layer mixture: weigh WC powder, Co powder and Cr respectively 3 C 2 Powder for raw material batching, WC powder particle size d bottom It is 9±0.5μm, the mixed raw materials are subjected to wet ball milling. After the wet ball milling is completed, the wet ball milled mixture is subjected to the first wet sieving, and the first sieved mixture is subjected to vacuum Drying, sieving the vacuum-dried mixture for the second time, and then adding wax to dry to obtain the super coarse grained cemented carbide mixture for the bottom layer;

[0019] (2) Prepare the top layer...

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Abstract

The invention discloses a preparation method for cemented carbide gradient drill point dies having super coarse grains. The method comprises following steps: taking and weighing WC powder, Co powder and Cr3C2 powder for raw material batching, ball milling, sieving, waxing and drying to obtain super-coarse-grain cemented carbide mixture. The particle size d bottom of the bottom layer mixture WC powder of the super-coarse-grain cemented carbide gradient drill point dies is 9+ / -0.5[mu]m, the top layer mixture WC powder particle size d top is 6+ / -0.5[mu]m. Die filling, lamination pressing and sintering. The prepared super-coarse-grain cemented carbide gradient drill point dies have good shock resistance and the service life of which is three times of that of normal products; particle size gradient is adopted instead of component gradient so that component diffusion during sintering process is avoided and the product performance consistency is high.

Description

Technical field [0001] The invention relates to the technical field of cemented carbide, in particular to a method for preparing an ultra-coarse grained cemented carbide gradient drill tail die. Background technique [0002] Cemented carbide is a material with high hardness, high strength and high wear resistance, which has been widely used in many fields of modern industry. Cemented carbide products are usually powder metallurgical products sintered in a vacuum furnace or a hydrogen sintering furnace with the main component of the carbide micron powder of high-hardness refractory metal and cobalt or nickel as the binder. In the technical field of cemented carbide, cemented carbide with a WC grain size greater than 5 μm is usually defined as an ultra-coarse grained cemented carbide. Ultra-coarse-grained cemented carbide products are widely used in petroleum drill teeth, coal cutter teeth, road cold milling machine teeth, stamping dies, rolls and other fields. [0003] Cemented ca...

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Application Information

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IPC IPC(8): B22F1/00B22F3/02B22F3/10B22F5/00
CPCB22F3/004B22F3/02B22F3/1017B22F5/007B22F2999/00B22F1/052B22F2207/13
Inventor 刘如堂李京达梁勇川林湘庆
Owner XINJINGRUI TUNGSTEN STEEL (XIAMEN) CO LTD
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