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Composite powder with heterogeneous core-shell structure and preparation method thereof

A technology of composite powder and core-shell structure, used in metal processing equipment, coating, transportation and packaging, etc. Complexity and other problems, to achieve the effects of cheap reaction raw materials, shortened production cycle, and simple process

Inactive Publication Date: 2019-03-22
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the fact that the existing technology still cannot improve the uniformity of the inhibitor and the binder phase metal in the mixture well, and there are problems such as complicated preparation process, high cost, and difficult adjustment of components, the present invention provides a heterogeneous core Shell structure composite powder and preparation method thereof

Method used

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  • Composite powder with heterogeneous core-shell structure and preparation method thereof

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Embodiment 1

[0026] A composite powder with a heterogeneous core-shell structure, with WC as the core, inhibitor VC as the inner shell, and FeCoNi alloy as the outer shell; the mass fraction of the inhibitor in the composite powder is 1.4wt.%, FeCoNi alloy The mass fraction in the composite powder is 10wt.%, and the mass ratio of Fe, Co, and Ni in the FeCoNi alloy is 1:2:1.

[0027] The preparation method of the above heterogeneous core-shell structure composite powder comprises the following steps:

[0028] (1) Weigh 50kg of ammonium paratungstate, 1kg of ammonium metavanadate, 4kg of cobalt oxalate, 2.3kg of ferric chloride, 2kg of nickel oxalate, glucose 41kg;

[0029] (2) Dissolve the ammonium paratungstate, ammonium metavanadate, cobalt oxalate, ferric chloride, nickel oxalate, and glucose in 250kg deionized water to prepare a solution, and carry out mixing treatment at 80°C for 10 minutes to obtain a mixed solution, and mix the mixed solution Transfer to a polytetrafluoroethylene-l...

Embodiment 2

[0032] A composite powder with heterogeneous core-shell structure, with WC as the core, inhibitors VC, Cr 3 C 2 is the inner shell layer, and the FeCoNi alloy is the outer shell layer; the mass fraction of the inhibitor in the composite powder is 1.8wt.%, and the mass fraction of the binder phase metal in the composite powder is 4.5wt.%. , The mass ratio of Fe, Co, and Ni in FeCoNi alloy is 1:1:2.

[0033] The preparation method of the above heterogeneous core-shell structure composite powder comprises the following steps:

[0034] (1) Weigh 53kg of ammonium metatungstate, 1kg of ammonium metavanadate, 0.5kg of ammonium dichromate, 2kg of iron oxalate, and acetic acid according to the composition of the heterogeneous core-shell composite powder. Cobalt 1.5kg, nickel acetate 3kg, sucrose 39.5kg;

[0035] (2) Dissolving the ammonium metatungstate, ammonium metavanadate, ammonium dichromate, ferric oxalate, cobalt acetate, nickel acetate, and sucrose in 300kg deionized water t...

Embodiment 3

[0038] A composite powder with heterogeneous core-shell structure, with WC as the core, inhibitors VC, Cr 3 C 2is the inner shell layer, FeCoNi alloy is the outer shell layer; the mass fraction of the inhibitor in the composite powder is 4wt.%, the mass fraction of the binder phase metal in the composite powder is 14wt.%, FeCoNi The mass ratio of Fe, Co and Ni in the alloy is 1:1:1.

[0039] The preparation method of the above heterogeneous core-shell structure composite powder comprises the following steps:

[0040] (1) Weigh 42kg of ammonium metatungstate, 3kg of ammonium molybdate, 8.3kg of iron oxalate, 5kg of cobalt oxalate, 5kg of nickel oxalate, 40kg of sucrose;

[0041] (2) The ammonium metatungstate, ammonium molybdate, iron oxalate, cobalt oxalate, nickel oxalate, and sucrose were dissolved in 250kg deionized water to prepare a solution, and mixed at 70°C for 20 minutes to obtain a mixed solution. The solution was transferred to a polytetrafluoroethylene-lined st...

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Abstract

The invention relates to the technical field of hard alloys, and specifically discloses composite powder with a heterogeneous core-shell structure and a preparation method thereof. The composite powder with the heterogeneous core-shell structure takes WC as an inner core, takes an inhibitor as an inner shell layer, and takes binding-phase metal as an outer shell layer, wherein the inhibitor is a transition metal carbide, the binding-phase metal is an alloy mixture of Co, Ni and Fe; mass fraction, in the composite powder, of the inhibitor is 1.2wt.%-4wt.%; mass fraction, in the composite powder, of the binding-phase metal is 3wt.%-15wt.%; and a mass ratio of Co to Ni to Fe in the alloy mixture is (1-2) to (1-2) to (1-2). The composite powder with the heterogeneous core-shell structure provided by the invention is uniform in texture, is stable in performance, and is easily regulated in component; and process parameters can be regulated, the powder inner-core average particle diameter, inner and outer shell thickness as well as components and the like are regulated, so that foundation is laid for preparing high-performance hard alloys of different grain sizes.

Description

technical field [0001] The invention relates to the technical field of hard alloys, in particular to a composite powder with a heterogeneous core-shell structure and a preparation method thereof. Background technique [0002] Cemented carbide refers to a type of composite material prepared by powder metallurgy with carbides such as tungsten carbide as the hard phase and metals such as iron, cobalt, and nickel as the binder phase. It has high hardness, good strength, and wear resistance. And a series of characteristics such as excellent red hardness, suitable for making cutting, tunneling, wear-resistant and other tool and mold products. When cemented carbide is prepared by powder metallurgy, the alloy compact must be sintered at high temperature. This process can easily lead to the growth of hard phase grains, making the mechanical properties of the alloy unable to meet the requirements. Therefore, in order to inhibit the growth of hard phase grains, a small amount of addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C22C29/08B22F9/20
CPCC22C29/08B22F9/20B22F1/17
Inventor 马世卿杨治刚王志秦胜建吴红亚
Owner SHIJIAZHUANG TIEDAO UNIV
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