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Hard alloy/metal ceramic powder for 3D printing and preparation method thereof

A cemented carbide and cermet technology, applied in metal processing equipment, nanotechnology for materials and surface science, transportation and packaging, etc., can solve the problem of limited dissolution and re-precipitation of hard phase/ceramic phase grains, and inability to Complete the problems of sufficient liquid phase flow, particle rearrangement, and uneven dispersion of components to achieve the effects of avoiding component segregation, good flow performance and filling performance, and performance tending to be consistent

Pending Publication Date: 2022-07-08
GANNAN NORMAL UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, long-term and high-intensity ball milling will lead to a sharp decrease in the grain size of the hard phase / ceramic phase and an excessively wide grain size distribution, while insufficient ball milling intensity will result in uneven dispersion of ingredients
This kind of powder defect is particularly obvious when 3D printing is used to prepare cemented carbide / cermet. Take the preparation of cemented carbide / cermet by laser selective melting as an example. During the laser scanning process, the rapid melting and solidification prevents the material from completing the liquid phase. Sufficient flow and particle rearrangement, the appearance of short-term liquid phase leads to the dissolution and re-precipitation of hard phase / ceramic phase grains, and the growth is limited

Method used

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  • Hard alloy/metal ceramic powder for 3D printing and preparation method thereof
  • Hard alloy/metal ceramic powder for 3D printing and preparation method thereof
  • Hard alloy/metal ceramic powder for 3D printing and preparation method thereof

Examples

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preparation example Construction

[0039] A preparation method of cemented carbide / cermet powder for 3D printing, comprising the following steps:

[0040] In step S1, the hard phase / ceramic phase raw material powder and the binder phase metal raw material powder are respectively deagglomerated, crushed and classified by using the air pulverization and classification technology, so as to obtain the hard phase / ceramic phase powder and the adhesive phase powder with uniform and narrow particle size distribution. junction metal powder;

[0041] Specifically, the hard phase / ceramic phase powder is tungsten carbide, molybdenum carbide, titanium carbide, titanium nitride, titanium carbonitride, tantalum carbide, niobium carbide, silicon carbide, titanium boride, boron carbide, rhenium boride, oxide At least one of aluminum, zirconia, and magnesium oxide; the binder phase metal raw material powder is at least one of metal Co, Ni, Fe, Mn, Cu, Zn, Al, Sn, Cr, W, Mo;

[0042] The jet mill is used for jet mill classificat...

Embodiment 1

[0064] A WC-10wt.%Co cemented carbide powder for 3D printing, the preparation method comprising the following steps:

[0065] In step S1, the jet-type single-stage jet mill is used to depolymerize and classify 500Kg of WC with an average particle size of 5 μm to obtain ultra-fine WC with an average particle size of 0.4 μm. The main working parameter of the jet-type single-stage jet mill is the feeding speed. 50Kg / h, the working pressure of the jet mill is 15MPa, and the wind pressure of the cyclone collector is 10KPa;

[0066] Step S2, adding 90Kg of ultra-fine WC with an average particle size of 0.4 μm, 10Kg of Co powder with an average particle size of 1 μm and 3Kg of carboxymethyl cellulose into 150 L of water, fully stirring and dispersing to form a gel suspension;

[0067] Step S3, spray-drying the gel suspension at 100° C. in a nitrogen atmosphere to obtain a porous spherical powder; the SEM image of the porous spherical powder is shown in figure 2 ;

[0068] Step S4,...

Embodiment 2

[0073] A TiB for 3D printing 2 -10wt.%Co-10wt.%Ni cermet powder, its preparation method includes the following steps:

[0074] In step S1, 200Kg of TiB with an average particle size of 2 μm is processed by a counter-jet single-stage jet mill. 2 Deagglomeration and classification were performed to obtain ultrafine TiB with an average particle size of 0.5 μm 2 , the main working parameters of the jet single-stage jet mill are the feeding speed 30Kg / h, the working pressure of the jet mill 20MPa, and the wind pressure of the cyclone collector 4KPa;

[0075] Step S2, 80Kg of ultrafine TiB with an average particle size of 0.5 μm 2, 10Kg of Co powder with an average particle size of 1μm, 10Kg of Ni powder with an average particle size of 1μm and 5Kg of polyvinylpyrrolidone were added to 200L of absolute ethanol, fully stirred and dispersed to form a gel suspension;

[0076] Step S3, spray-drying the gel suspension at 80°C in an argon atmosphere to obtain a porous spherical powder;...

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Abstract

The invention provides a preparation method of hard alloy / metal ceramic powder for 3D printing. The preparation method comprises the following steps that hard phase / ceramic phase powder and binding phase metal powder are depolymerized, crushed and graded through an airflow crushing and grading technology; hard phase / ceramic phase powder, binding phase metal powder and a thickening agent are added into the solution, and gel suspension liquid is obtained; carrying out spray drying on the gel suspension to obtain porous spherical powder; the porous spherical powder is subjected to pre-sintering-reduction treatment, and preliminary compact spherical powder is obtained; and plasma spheroidizing is conducted after depolymerization and grading treatment, and the high-density spherical hard alloy / metal ceramic powder is obtained. According to the preparation method of the hard alloy / metal ceramic powder for 3D printing, provided by the invention, the prepared spherical powder has the characteristics of controllable hard phase / ceramic phase structure, high density and highly uniform phase distribution and spherical particle size. The invention further provides the hard alloy / metal ceramic powder prepared through the method.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy and powder engineering, in particular to a cemented carbide / cermet powder for 3D printing and a preparation method thereof. Background technique [0002] Cemented carbide and cermet are a kind of composite material prepared by powder metallurgy method, which is mainly composed of hard phase / ceramic phase particles and binder phase metal. The process of preparing cemented carbide / cermet by traditional powder metallurgy method includes the preparation of hard phase / ceramic phase particle-binder phase metal mixture, press forming and sintering. Commonly used molding processes include compression molding, extrusion molding, injection molding, and the like. Due to the limitations of mold manufacturing and shape, in actual production, there are still some parts with complex shapes that are difficult to form by traditional pressing processes, thus limiting the application of cemented carbide / c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/02B22F1/10B22F1/12B22F9/04B33Y70/10B82Y30/00B82Y40/00
CPCB22F9/026B22F9/04B82Y40/00B82Y30/00B33Y70/10B22F2009/044Y02P10/25
Inventor 何人桂邱玉珍张小联杨海林欧平花杨初斌韩宝军彭光怀方玲
Owner GANNAN NORMAL UNIV
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