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Preparation method of carbide-Co/Ni composite powder and hard alloy

A cemented carbide and composite powder technology, applied in the fields of hydrometallurgy and powder metallurgy, can solve the problems of excessive WC particle breakage, etc., and achieve the effect of short process, low cost and less emission

Inactive Publication Date: 2009-08-19
CENT SOUTH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to avoid the problem of excessive breakage of WC particles caused by the wet grinding process and solve the problem of preparing coarse-grained, ultra-coarse-grained, and extra-coarse-grained hard alloys, the present invention provides a high-purity cemented carbide production without external impurity elements. Hydrometallurgical preparation method of MC-Co / Ni composite powder and method for preparing cemented carbide using the composite powder

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  • Preparation method of carbide-Co/Ni composite powder and hard alloy
  • Preparation method of carbide-Co/Ni composite powder and hard alloy
  • Preparation method of carbide-Co/Ni composite powder and hard alloy

Examples

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Embodiment 1

[0024] Example 1 WC-Co-Ni composite powder was prepared according to the composition of WC-6.25wt.%Co-6.25wt.%Ni. WC with a FSSS of 6.5 μm was selected as the raw material, and the mechanical pretreatment was carried out by ball milling in a ball mill for 6 hours at a ball-to-material ratio of 3:1. 200g NH 4 Cl and 53.82g CoCl 2 ·6H 2 O, 53.95g NiCl 2 ·6H 2 O was dissolved in deionized water respectively; the two were mixed and filtered; 64.73 g concentrated NH was added 3 Water, configure 1L cobalt ammonia complex solution. 200 g of the above-mentioned WC powder and the above-mentioned cobalt-ammonia complex solution were put into a 2L autoclave. with N 2 After exhausting the air in the kettle, pass in H 2Make the pressure in the kettle reach 3.5MPa, adjust the rotation speed of the autoclave to 1000r / min, keep the temperature at 170°C, and keep the temperature at 3h to carry out the hydrothermal high-pressure hydrogen reduction reaction. After the reaction, the obta...

Embodiment 2

[0025] Example 2 WC-Co composite powder was prepared according to WC-12.5wt.% Co composition. WC with a FSSS of 6.5 μm was selected as the raw material, and the mechanical pretreatment was carried out by ball milling in a ball mill for 6 hours at a ball-to-material ratio of 3:1. 250g (NH 4 ) 2 SO 4 with 136.24g CoSO 4 ·7H 2 O was dissolved in deionized water respectively; the two were mixed and filtered; 64.73 g concentrated NH was added 3 water (NH 3 :Co=2.2:1), configure 1L cobalt ammonia complex solution. 200 g of the above-mentioned WC powder and the above-mentioned cobalt-ammonia complex solution were put into a 2L autoclave. with N 2 After exhausting the air in the kettle, pass in H 2 Make the pressure in the kettle reach 3.5MPa, adjust the rotation speed of the autoclave to 1000r / min, keep the temperature at 170°C, and keep the temperature at 3h to carry out the hydrothermal high-pressure hydrogen reduction reaction. After the reaction was completed, the WC-Co...

Embodiment 3

[0026] Example 3 WC-Co composite powder was prepared according to the WC-8wt.% Co composition. Select WC with FSSS of 12.0 μm as raw material, and perform mechanical pretreatment by ball milling in a ball mill for 8 hours at a ball-to-material ratio of 3:1. 150gNH 4 Cl and 70.18g CoCl 2 ·6H 2 O was dissolved in deionized water respectively; the two were mixed and filtered; 39.40 g concentrated NH was added 3 water (NH 3 :Co=2.2:1), configure 1L cobalt ammonia complex solution. 200 g of the above-mentioned WC powder and the above-mentioned cobalt-ammonia complex solution were put into a 2L autoclave. The rest of the process parameters are the same as in Example 2. The results of chemical analysis showed that the Co content in the WC-Co composite powder was 7.41wt.%, the O content (total oxygen analysis) was 0.1091wt.%, the H content was 0.0104wt.%, and the Co yield was 92.6%. The combination of the metallographic observation of the polished section of the alloy shows tha...

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Abstract

The invention relates to a method for preparing carbide (MC)-Co / Ni composite powder and hard alloy, and belongs to the field of wet metallurgy and powder metallurgy. The method adopts mechanically pretreated MC powder using WC as a main component and cobalt / nickel ammine complexing solution as raw materials, utilizes the self-catalysis activity of the mechanically pretreated MC powder, and adopts a hydrothermal high-pressure hydrogen reduction process to prepare the MC-Co / Ni composite powder under the condition that a sensitizing agent, an activating agent and a catalyst are not added; and on the basis, the method prepares the hard alloy of which the grain size is more than or equal to 4.5mu m without a wet grinding process. The method has the characteristics of low cost, short flow and high purity, does not cause alloy pollution, and the like.

Description

technical field [0001] The invention relates to a hydrometallurgical preparation method of carbide (MC)-Co / Ni composite powder for cemented carbide production and the preparation of coarse-grained, ultra-coarse-grained and extra-coarse-grained with grain size ≥ 4.5 μm using it as a raw material The preparation method of cemented carbide belongs to the field of hydrometallurgy and powder metallurgy. Background technique [0002] According to the classification standard of cemented carbide by Sandvik, the largest cemented carbide manufacturer in the world, the cemented carbides with WC grain size of 3.5-4.9 μm, 5.0-7.9 μm and 8.0-14 μm are respectively coarse-grained, super-sized Coarse-grained and extra-coarse-grained cemented carbide. Ultra-coarse and extra-coarse-grained cemented carbide is currently a domestic blank. Under the condition of the same Co content, compared with the traditional medium and coarse grained cemented carbide, the ultra-coarse and extra-coarse grai...

Claims

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Application Information

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IPC IPC(8): B22F9/00B22F9/04B22F9/26C22C1/05C22C29/08
Inventor 张立吴厚平陈青林
Owner CENT SOUTH UNIV
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