Co-gelation injection molding forming method of gradient porous metal

A gradient porous and gel injection molding technology, which is applied in the field of powder metallurgy preparation, can solve the problems of microwave technology and other problems, and achieve the effects of simple process, energy saving and fast sintering speed

Active Publication Date: 2017-05-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the metal's reflection of microwaves and the skin effect of microwave heating, the application of microwave technology in the preparation of powder metal dense materials is restricted. Howev

Method used

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  • Co-gelation injection molding forming method of gradient porous metal
  • Co-gelation injection molding forming method of gradient porous metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Combine -325 mesh spherical Ni powder and -325 mesh TiH 2 Mix according to the atomic ratio of 58.9:49.8, and ball mill for 2 hours to obtain mixed powder; combine the monomer 2-hydroxyethyl methacrylate (HEMA) and the crosslinking agent hexanediol diacrylate (HDDA) in mass ratio Mix at a ratio of 10:1 and dissolve it in n-octanol to obtain a premixed solution with a monomer mass fraction of 25wt%; mix the weighed and mixed powder and its mass fraction of silok7074 with a mass fraction of 1.5wt%, and mix for 10h by ball milling. Into two slurries with a solid phase volume fraction of 52vol% and 42vol%; vacuum degassing for 30 minutes, add initiator and catalyst with monomer mass of 0.5wt% to the two slurries, and stir them evenly. The material is injected into the mold at the same time according to the design, and placed in a vacuum for 20 minutes and then heated to 60°C for curing for 20 minutes; after the solidified body is demolded, it is placed in acetone for 2 hours ...

Embodiment 2

[0057] Mix -325 mesh spherical Ni powder and -325 mesh Ti powder at an atomic ratio of 58.9:49.8, and ball mill for 2 hours to obtain mixed powder; the monomer 2-hydroxyethyl methacrylate (HEMA) and crosslinking agent Hexanediol diacrylate (HDDA) is mixed in a mass ratio of 12:1, and it is dissolved in n-octanol to obtain a premixed solution with a monomer mass fraction of 30wt%; the weighed and mixed powder and its mass The fraction of 1.8wt% oleic acid was mixed, ball milled for 10 hours, and the solid phase volume fraction was 54vol% slurry A respectively; by introducing the particle size -200 mesh 8wt% urea, particle size -100 mesh 20wt% urea, With a particle size of 60 mesh and 35wt% urea, slurries B, C and D with a loading capacity of 54vol%, 52vol% and 50vol% were prepared by the above-mentioned similar process; the above-mentioned slurries were vacuum degassed for 20 minutes, and monomers were added. Initiator and catalyst with a mass of 0.5wt%, after stirring uniformly...

Embodiment 3

[0059] The monomer 2-hydroxyethyl methacrylate (HEMA) and the crosslinking agent hexanediol diacrylate (HDDA) are mixed in a mass ratio of 10:1, and the monomer mass is obtained after dissolving in n-octanol A premixed liquid with a fraction of 25% by weight; the hydrogenated-dehydrogenated titanium powder with an average particle size of 45 microns and a mass fraction of 1.5% by weight of silok7074 are mixed, and ball-milled for 10 hours to obtain a solid phase volume fraction of 52vol% and 42vol%. Two kinds of slurries; vacuum degassing for 30 minutes, add initiator and catalyst of 0.5wt% monomer mass to the two slurries respectively, after stirring uniformly, the two slurries are injected into the mold at the same time according to the design, and in vacuum After standing for 20 minutes, it is heated to 60°C and cured for 20 minutes; after curing, the body is released from the mold, placed in acetone for 2 hours to remove most of the n-octanol, and then placed in a vacuum dry...

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Abstract

The invention relates to a co-gelation injection molding forming method of a gradient porous alloy, and belongs to the technical field of powder metallurgy preparation. A preparation method of the gradient porous alloy comprises the steps that premixed liquid is prepared and obtained, wherein the mass ratio of a monomer to a cross-linking agent is equal to (5-15):1, and the mass percentage concentration ranges from 5% to 40%; then metal powder is prepared, and the metal powder and the premixed liquid are mixed and prepared into series slurry with the raw material powder volume concentrations being A1, A2...Ai; and then the obtained series slurry is injected into a mold from different injection openings according to the sequence of the metal powder concentrations from large to small, curing and microwave sintering are carried out, and the gradient porous alloy is obtained. A gradient porous material or complex product with no obvious interface is prepared through the method, wherein the average pore size can change from 8 micrometers to 650 micrometers relatively continuously or according to design, and the porosity can change from 17% to 68% relatively continuously or according to design. The process is simple and controllable, cost is low, the production efficiency is high, near-net forming can be achieved, and the method is suitable for industrial volume production.

Description

Technical field [0001] The invention relates to a co-gel injection molding method for gradient porous alloys, in particular to a method for rapidly preparing gradient porous alloys by combining co-gel injection molding molding technology and microwave sintering method; it belongs to the technical field of powder metallurgy preparation. [0002] technical background [0003] Porous nickel-titanium alloy has the characteristics of high strength, good corrosion resistance, excellent biocompatibility and certain shape memory effect. In addition, the porous structure is conducive to the formation of bone and the flow of blood nutrients, thus becoming the orthopedic implant material. best choice. Traditional preparation methods include pressing and sintering, self-propagating high-temperature synthesis, hot isostatic pressing, powder injection molding, and laser / electron beam selective sintering. However, these methods either require expensive equipment and high cost; or they cannot dir...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F3/11
CPCB22F3/1109B22F3/225
Inventor 段柏华张亚松王德志
Owner CENT SOUTH UNIV
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