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Low-tungsten-carbide-adjacency hard alloy and preparing method thereof

A cemented carbide and tungsten carbide adjacent technology, which is applied in the field of low tungsten carbide adjacent cemented carbide and its preparation, can solve the problems of reduced toughness of cemented carbide and increased WC/WC adjacent degree, etc.

Active Publication Date: 2020-06-16
SHAANXI SCI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The uniform distribution of Co at the WC / WC interface is the key to improving the toughness of cemented carbide. If the distribution of Co is uneven, it will easily cause the increase of WC / WC adjacency, which will lead to the decrease of toughness of cemented carbide.

Method used

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  • Low-tungsten-carbide-adjacency hard alloy and preparing method thereof
  • Low-tungsten-carbide-adjacency hard alloy and preparing method thereof
  • Low-tungsten-carbide-adjacency hard alloy and preparing method thereof

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preparation example Construction

[0020] The invention provides a method for preparing a cemented carbide with low tungsten carbide contiguity, comprising the following steps:

[0021] The tungsten carbide powder is spheroidized and sieved in sequence to obtain sieved powder;

[0022] Spraying a cobalt film on the surface of the sieved powder to obtain a cobalt film tungsten carbide composite powder;

[0023] Mixing the cobalt film tungsten carbide composite powder and tantalum carbide powder, performing interfacial diffusion heat treatment under stirring conditions, to obtain a precursor powder;

[0024] The precursor powder is sintered to obtain a cemented carbide with low tungsten carbide contiguity.

[0025] In the present invention, unless otherwise specified, the raw materials and equipment used are commercially available items well known to those skilled in the art.

[0026] In the invention, the tungsten carbide powder is sequentially subjected to spheroidization treatment and sieving treatment to ob...

Embodiment 1

[0036](1) Put tungsten carbide powder with an average particle size of 19 μm into a disc-type micro-shear grinding device for spheroidization treatment to obtain spheroidized powder; wherein, in the disc-type micro-shear grinding device, silicon carbide is inlaid with Miniature grinding cones, the miniature grinding cones are arranged in the form of involutes, the distance between two adjacent micro grinding cones is 7μm, the spindle speed is 112r / min, based on the mass of tungsten carbide powder, the efficiency of spheroidizing treatment is 1.5h / kg;

[0037] (2) Sieving the spheroidized powder with a vibrating sieve to obtain a sieved powder with a particle size of 17-19 μm; wherein, the effective inner diameter of the screen is 30 μm, 18 μm, and 7 μm, and the vibration frequency is 15 Hz;

[0038] (3) The sieved powder is placed in a frequency-vibration rotary stirring and spraying cobalt device, with cobalt wire as the cobalt source and nitrogen as the medium, when the nit...

Embodiment 2～8

[0042] Prepare low tungsten carbide contiguity cemented carbide according to the method of embodiment 1, the operating parameters of raw material and each step are as shown in table 1 (operating conditions or parameters not listed in table 1 are identical with embodiment 1, the consumption of tantalum carbide powder Specifically, the mass of cobalt film tungsten carbide composite powder is taken as 1).

[0043] Raw materials and operating parameters of each step in Table 1 Examples 1-8

[0044]

[0045]

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Abstract

The invention provides a low-tungsten-carbide-adjacency hard alloy and a preparing method thereof, and belongs to the technical field of tungsten alloy preparation. The preparing method includes the following steps of sequentially performing balling treatment and screening treatment on tungsten carbide powder to obtain screened powder, spray-coating the surface of the screened powder with a cobaltfilm to obtain cobalt film and tungsten carbide composite powder, mixing the cobalt film and tungsten carbide composite powder with tantalum carbide powder, performing interface diffusion heat treatment under the stirring condition to obtain precursor powder, and performing selected laser sintering on the precursor powder to obtain the low-tungsten-carbide-adjacency hard alloy. The hard alloy prepared through the method has the low tungsten carbide adjacency, the excellent mechanical properties, the tungsten carbide adjacency of lower than or equal to 4.3%, the microhardness of higher than orequal to 14.5 GPa, the bending strength of higher than or equal to 2550 MPa and the breaking tenacity of higher than or equal to 11.3 MPa.m[1 / 2].

Description

technical field [0001] The invention relates to the technical field of tungsten alloy preparation, in particular to a cemented carbide with low tungsten carbide contiguity and a preparation method thereof. Background technique [0002] Co element is an important binder phase of YG cemented carbide, which is used to increase the toughness of cemented carbide. The uniform distribution of Co at the WC / WC interface is the key to improving the toughness of cemented carbide. If the distribution of Co is uneven, it is easy to increase the adjacency of WC / WC, which in turn leads to a decrease in the toughness of cemented carbide. Therefore, how to reduce the adjacency of tungsten carbide to reduce the brittleness of cemented carbide, improve its toughness, and make it have good mechanical properties is a technical problem that needs to be solved urgently. Contents of the invention [0003] The object of the present invention is to provide a cemented carbide with low tungsten carb...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05C22C1/10
CPCC22C1/051C22C29/067C22C29/08
Inventor 董洪峰艾桃桃李文虎
Owner SHAANXI SCI TECH UNIV
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