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Powder injection molding process

A powder injection molding and injection molding technology, applied in the field of powder injection molding materials, can solve problems such as human health, production safety and environmental protection, volatile, high toxicity, etc., to improve the production environment and production safety, The effect of high safety and slight toxicity

Pending Publication Date: 2021-09-21
杭州铭赫科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the lubricating aids used in this invention have low melting points, and the blanks in the production process are relatively soft, so the selection of lubricating aids is very limited, which increases the difficulty of production
Moreover, methanol, ethanol, propanol and other alcohols have low flash points and high volatility, so there are still problems in production safety.
[0010] Traditional degreasing solvents for powder injection molding are halogenated hydrocarbons, low molecular weight alkanes (C ≤ 8), etc. These organic compounds have disadvantages such as volatile, low flash point, high risk factor, high toxicity, and serious environmental pollution.
It has adverse effects on human health, production safety, environmental protection, etc. It is a key control substance for VOC emissions, and the environmental protection approval of new projects is basically not approved.
Especially halogenated hydrocarbons, in addition to their own toxicity, their waste discharge will cause secondary pollution

Method used

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  • Powder injection molding process
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0030] Feed: powder injection molding wax-based zirconia feed formula is as follows:

[0031]

[0032]

[0033] Zirconia powder, polyethylene, polystyrene, and isopropyl titanate triisostearate are added to the banburying tank, the temperature of the banburying tank is raised to 185°C, and the speed of the banburying tank is 15r / min for 0.5h; the temperature of the banburying tank is lowered to At 165°C, add stearic acid, paraffin wax, and carnauba wax, continue stirring for 1 hour, and then extrude and granulate.

[0034] Injection molding: Conventional injection process.

[0035]Solvent extraction and degreasing: degreasing with limonene + dipentene mixed solution (mass ratio 1:1), solvent temperature 60°C, degreasing time: 12h. Sintering: Thermal degreasing process, heating up to 600°C in 4 hours, holding at 600°C for 4 hours. Sintering process: 1500℃ / 6h air sintering.

Embodiment example 2

[0037] Feeding: powder injection molding wax-based 95W5Ni feeding formula is as follows:

[0038]

[0039]

[0040] 95W5Ni alloy powder, polyethylene, polypropylene, and isopropyl titanate triisostearate are added to the banburying tank, the temperature of the banburying tank is raised to 190°C, and the speed of the banburying tank is 18r / min for 0.5h; the temperature of the banburying tank is lowered to 170°C °C, add stearic acid, paraffin wax, and microcrystalline wax, continue stirring for 1 hour, and then extrude and granulate. Injection molding: Conventional injection process.

[0041] Solvent extraction degreasing: degreasing with terpineol, solvent temperature 70°C, degreasing time: 12h. Sintering: Thermal degreasing process, heating up to 600°C in 5 hours, and holding at 600°C for 4 hours. Sintering process: 1450℃ / 8h hydrogen sintering.

Embodiment example 3

[0043] Feed: powder injection molding wax-based 17-4 stainless steel feed formula is as follows:

[0044]

[0045] 17-4 stainless steel alloy powder, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and isopropyl titanate triisostearate are added to the banburying tank, the temperature of the banburying tank is raised to 180°C, and the speed is 20r / min for banburying 0.5h; lower the temperature of the banbury tank to 160°C, add zinc stearate and microcrystalline wax, continue stirring for 0.5h, and then extrude and granulate. Injection molding: Conventional injection process.

[0046] Solvent extraction degreasing: degreasing with limonene, solvent temperature 70°C, degreasing time: 8h. Sintering: Thermal degreasing process, heating up to 600°C in 4 hours, holding at 600°C for 2 hours. Sintering process: 1310℃ / 4h vacuum sintering.

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Abstract

The invention relates to a powder injection molding process. The powder injection molding process is characterized by comprising the following steps: mixing inorganic material powder with mixed organic matters, and extruding and granulating the mixture to form a feed, wherein the organic matters comprise an adhesive, a lubricating dispersant and a coupling agent; feeding the feed into an injection molding machine, and injecting the feed into a mold cavity to form an injection molding blank in a required shape; soaking the injection molding blank into an extraction degreasing solvent for solvent degreasing to remove a part of organic matters, wherein the extraction degreasing solvent is a monoterpene compound; putting the blank without a part of adhesive into a sintering furnace for thermal degreasing and sintering to form a semi-finished product; and performing necessary machining and surface treatment on the semi-finished product to form a final finished product. According to the powder injection molding process, the degreasing rate, sintering density, physical performance and the like of the product meet the requirements, and the powder injection molding process is high in use safety, non-toxic and environment-friendly.

Description

technical field [0001] The invention belongs to the field of powder injection molding materials, in particular to a powder injection molding process. Background technique [0002] Powder injection molding is a new component forming processing technology formed by introducing plastic injection molding technology into the field of powder metallurgy. It mixes powder (metal powder, ceramic powder) and organic binder to form a uniform feed, after granulation and then injection molding to obtain a shaped billet, and then sinters and densifies it into the desired finished product after degreasing treatment. Since the process is net-size forming, it has the advantages of high material utilization rate, direct forming into complex shapes, high mass production efficiency, and high dimensional accuracy. The more successful commercial applications. [0003] The binder system is divided into thermosetting, thermoplastic, water-soluble, gelling, etc. according to its properties. Among ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/24B22F3/10
CPCB22F3/225B22F3/227B22F3/1021B22F3/24B22F2003/241
Inventor 张素荣郑平根郑文鹏
Owner 杭州铭赫科技有限公司
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