Injection forming feed for superfine hard alloy and preparation method thereof

A cemented carbide and injection molding technology, which is applied in the field of powder metallurgy, can solve problems such as many defects, low degreasing efficiency, and single type, and achieve the effects of reducing degreasing time, improving production efficiency, and broad application prospects

Active Publication Date: 2019-01-18
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of superfine cemented carbide injection molding feeding material, which solves the technical problems of the existing ultrafine cemented carbide MIM feeding material types, low degreasing efficiency and many defects, and can effectively shorten the injection molding time. Reduce the degreasing time of the billet and improve the production efficiency of cemented carbide parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] A preparation method of superfine cemented carbide injection molding feed, comprising:

[0028] Weighing 92.0% to 94.5% of ultrafine cemented carbide powder and 5.5% to 8.0% of binder; wherein the binder includes 59.0 to 69.0% of polyoxymethylene (POM), 23.0-35.0% polyethylene glycol (PEG), 3.0-4.0% high-density polyethylene (HDPE), 2.0-2.5% ethylene-vinyl acetate copolymer (EVA) and 1.0-1.5% stearic acid ( SA);

[0029] Preheat the ultrafine cemented carbide powder in an internal mixer;

[0030] Melting polyethylene glycol (PEG) and mixing it evenly with the preheated ultrafine cemented carbide powder to form a first mixture, and kneading the first mixture to raise the temperature;

[0031] After the temperature stabilizes, add polyoxymethylene (POM), high-density polyethylene (HDPE), ethylene-vinyl acetate copolymer (EVA) and stearic acid (SA) into the first mixture, and take them out after kneading and proceed sequentially Cooling, crushing and granulation.

[00...

Embodiment 1

[0038] This embodiment provides a kind of superfine cemented carbide injection molding feedstock, which is prepared by the following method:

[0039]Weigh 92% ultrafine cemented carbide powder and 8% binder; wherein, the ultrafine cemented carbide powder is WC-6Co (YG6) powder, and the average particle size of WC is 0.5 μm. The binder comprises 69.0% polyoxymethylene (POM), 23.0% polyethylene glycol (PEG), 4.0% high-density polyethylene (HDPE), 2.5% ethylene-vinyl acetate copolymer ( EVA) and 1.5% stearic acid (SA); Wherein, the melt index of polyoxymethylene (POM) is 70g / 10min; The relative molecular weight of polyethylene glycol (PEG) is 4000;

[0040] Preheat the ultrafine cemented carbide powder in the internal mixer, and the preheating temperature is 100-120°C;

[0041] Melt polyethylene glycol (PEG) and mix evenly with the preheated ultra-fine cemented carbide powder to form the first mixture, and knead the first mixture to raise the temperature to 185-195°C;

[0042] ...

Embodiment 2

[0045] This embodiment provides a kind of superfine cemented carbide injection molding feedstock, which is prepared by the following method:

[0046] Weigh 94.5% ultrafine cemented carbide powder and 5.5% binder; wherein, the ultrafine cemented carbide powder is WC-6Co (YG6) powder, and the average particle size of WC is 0.5 μm. The binder comprises 59.0% polyoxymethylene (POM), 35.0% polyethylene glycol (PEG), 3.0% high-density polyethylene (HDPE), 2.0% ethylene-vinyl acetate copolymer ( EVA) and 1.0% stearic acid (SA); Wherein, the melt index of polyoxymethylene (POM) is 100g / 10min; The relative molecular weight of polyethylene glycol (PEG) is 4000;

[0047] Preheat the ultrafine cemented carbide powder in the internal mixer, and the preheating temperature is 100-120°C;

[0048] Melt polyethylene glycol (PEG) and mix evenly with the preheated ultra-fine cemented carbide powder to form the first mixture, and knead the first mixture to raise the temperature to 185-195°C;

[...

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Abstract

The invention discloses injection forming feed for superfine hard alloy and a preparation method thereof, and relates to the field of powder metallurgy. The feed is prepared from, by mass, 92-94.5% ofsuperfine hard alloy powder and 5.5-8% of a binding agent, wherein the binding agent is prepared from 59.0-69.0% of polyformaldehyde (POM), 23.0-35.0% of polyethylene glycol (PEG), 3.0-4.0% of high density polyethylene (HDPE), 2.0-2.5% of an ethylene-vinyl acetate copolymer (EVA) and 1.0-1.5% of stearic acid (SA). The PEG is added after the superfine hard alloy powder is preheated, after the PEDand the superfine hard alloy powder are mixed uniformly, the POM, HDPE, EVA and SA are added for mixing, and the preparation is completed. The feed adopts oxalic acid for catalyzing degreasing, so that the degreasing time can be reduced obviously, the production efficiency can be improved obviously, the use of acid catalysts and toxic solvents which are harmful to the environment is avoided, and the injection forming feed is economical and environmentally friendly and has a broad application prospect.

Description

technical field [0001] The invention relates to the field of powder metallurgy, and in particular to an ultrafine cemented carbide injection molding feed material and a preparation method thereof. Background technique [0002] Cemented carbide has high hardness, strength, wear resistance and corrosion resistance, known as "industrial teeth", used to manufacture cutting tools, knives, molds and wear-resistant parts, widely used in military industry, aerospace, machinery Processing, metallurgy, oil drilling, mining tools and other fields. The performance of cemented carbide is related to the grain size of WC hard phase. According to the WC grain size, cemented carbide can be divided into: ultra-coarse grain, coarse grain, medium grain, fine grain, ultra-fine grain and nanocrystalline cemented carbide. Generally speaking, the coarser the WC grain of cemented carbide, the higher its impact resistance; the finer the WC grain, the higher the hardness and transverse fracture stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22
CPCB22F3/225B22F1/103B22F1/10
Inventor 胡可崔利群韩胜利邹黎明刘辛
Owner GUANGDONG INST OF NEW MATERIALS
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