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Composite powder, preparation method and application

A composite powder and powder technology, applied in the direction of coating, can solve the problems of collapse and inability to achieve effective composite, and achieve the effects of suitable particle size, simple extrusion granulation, and high composite strength

Active Publication Date: 2020-03-06
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem that the raw material powder with larger particle size cannot be effectively compounded and easily causes collapse in the prior art, the present invention provides a method for preparing composite powder, which can be used for larger particle size (≥20 μm ) compounding of powder raw materials

Method used

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  • Composite powder, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0072] A preparation method of composite powder, comprising the steps of:

[0073] (1) 70g of flake raw material powder, 120g of spherical raw material powder, 10g of binder polyvinyl alcohol and 30mL of lubricant water are mixed to obtain a primary extrusion raw material; the size of the flake raw material powder is 30 ~140μm, diameter-to-thickness ratio is 7, and the composition is nickel-coated bentonite; the size of the spherical-like powder is 40-90μm, and the composition is Ni-20Cr; the mass ratio of the flake raw material powder to the spherical-like raw material powder is 0.58;

[0074] (2) Place the primary extrusion raw material on one side of the first screen (100 mesh, 60±5μm wire diameter, 200GPa elastic modulus), and apply it at an inclined angle with an extrusion plate The extrusion force of 100N reciprocates 10 times on one side of the first screen cloth to carry out extrusion granulation;

[0075] (3) Put the primary particles at 20°C to 25°C and 45% to 50% ...

Embodiment 2

[0079] A preparation method of composite powder, comprising the steps of:

[0080] (1) 60g of flake raw material powder, 130g of spherical raw material powder, 10g of binder polyvinyl alcohol and 25mL of lubricant water are mixed to obtain a primary extrusion raw material; the size of the flake raw material powder is 60 ~120μm, diameter-to-thickness ratio is 4, and the composition is nickel-coated bentonite; the size of the spherical-like powder is 45-100μm, and the composition is Ni-20Cr; the mass ratio of the flake-like raw material powder to the spherical-like raw material powder is 0.44;

[0081] (2) Place the primary extrusion raw material on one side of the first screen (the mesh number is 120 mesh, the screen wire diameter is 41±3μm, and the elastic modulus is 200GPa), and use the extrusion plate at an inclined angle to apply The extrusion force of 50N reciprocates 18 times on one side of the first screen cloth to carry out extrusion granulation;

[0082] (3) Put the pr...

Embodiment 3

[0086] A preparation method of composite powder, comprising the steps of:

[0087] (1) 80 parts by weight of flake raw material powder, 110 parts by weight of spherical raw material powder, 10 parts by weight of binder and 3.6 mL / g of lubricant water are mixed to obtain primary extrusion raw material; The size of the powder is 80-120 μm, the diameter-thickness ratio is 50-100, and the composition is nickel-coated bentonite; the size of the spherical powder is 20-50 μm, and the composition is Ni-20Cr; the flake raw material powder and the like The mass ratio of the spherical raw material powder is 0.73;

[0088] (2a) Place the primary extrusion raw material on one side of the first screen (120 meshes, 100±4μm wire diameter, 80GPa rigidity), and apply 100N pressure with an extrusion plate at an inclined angle. Extrusion force reciprocates 3 times on one side of the first screen to carry out extrusion granulation;

[0089] (3) Put the primary granules at 20°C-25°C, 50-55% humid...

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Abstract

The invention relates to a preparation method of composite powder. The method includes the steps of: (1) mixing flaky raw material powder, spheroidic raw material powder, a binder and a lubricant to obtain a primary extrusion raw material; (2) carrying out primary extrusion granulation on the primary extrusion raw material to obtain primary particles; (3) airing the primary particles to obtain a secondary extrusion raw material; (4) carrying out secondary extrusion granulation on the secondary extrusion raw material to obtain secondary particles; and (5) drying the secondary particles to obtain the composite powder. The preparation method of the composite powder provided by the invention can reduce the particle size of the composite powder to the maximum extent under the same raw materialparticle size condition, meanwhile, also can effectively improve the composite strength of the raw material powder, and reduce the collapse rate to 5.2% or below at the same time.

Description

technical field [0001] The invention belongs to the field of powder preparation, and in particular relates to a composite powder, a preparation method and an application. Background technique [0002] Common powder compounding processes include mechanical mixing, agglomeration compounding, coating, etc. Mechanical mixing is the simplest composite powder preparation process. There are basically no special requirements for raw materials. However, due to differences in material properties of raw materials, such as specific gravity, electrostatic adsorption, etc., uneven mixing and subsequent uneven feeding will result. The agglomeration compounding and coating process fixes the raw materials of different components in the particles through the addition of binders, which effectively solves the problem of unevenness caused by the large difference in the physical properties of the raw material components. However, the agglomeration compounding and coating process has strict requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/65
CPCC09D1/00C09D7/65
Inventor 于月光刘建明沈婕章德铭刘通黄凌峰郭丹王帅卢晓亮侯伟骜原慷
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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