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Powder injection molding feedstock, and preparation method and application thereof

A powder injection molding and powder technology, applied in the field of powder metallurgy, can solve the problems of unstable shrinkage and easy deformation

Active Publication Date: 2018-07-24
DONGGUAN HUAJING POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the copper metal products prepared by traditional injection molding feedstock are not stable in shrinkage after sintering, especially when designing complex and precise structural parts, they are easy to deform

Method used

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  • Powder injection molding feedstock, and preparation method and application thereof
  • Powder injection molding feedstock, and preparation method and application thereof

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preparation example Construction

[0039] Also, see figure 1 , the preparation method of the above-mentioned powder injection molding feedstock according to one embodiment, comprising the following steps S110-S130.

[0040] S110, preheating the copper metal powder to 160°C-200°C.

[0041] Preheating the copper metal powder to 160°C to 200°C can melt the molding agent, so that the copper metal powder can be mixed and formed.

[0042] In this embodiment, the copper metal powder can be preheated to 180° C. to 190° C., so that the forming agent can be melted rapidly, and the temperature is not too high to damage the properties of the forming agent.

[0043] S120. Add a molding agent to the copper metal powder obtained in S110 and mix to form a mixture. The mass ratio of the copper metal powder to the molding agent is 90-92:8-10, and the molding agent includes 0.5-2 parts by mass. Stearic acid, 0.5-1.5 parts of antioxidant, 4-8 parts of paraffin, 2-8 parts of high-density polyethylene, 1.5-4 parts of polyethylene-...

Embodiment 1

[0077] The tap density of 20000g is 6.0g / cm 3The copper metal powder is preheated to 180°C, and the molding agent is added to the preheated copper metal powder according to the mass ratio of copper metal powder and molding agent as 91:9 and mixed for 40 minutes to form a mixture. The molding agent includes 19g stearin Acid, 19g antioxidant, 95.7g paraffin wax, 114.86g high density polyethylene, 38.28g polyethylene-acetate, 38.28g polyethylene wax and 1589g polyoxymethylene. Among them, high-density polyethylene, polyethylene-acetate, polyethylene wax, and polyoxymethylene are crushed at a low temperature below -50°C in advance to a particle size below 80 μm so as to be at the same particle size level as the copper metal powder. The mixed material is sent to an extruder for extrusion and granulation to obtain a powder injection molding feed. Inject the powder injection molding feedstock into the mold at 180°C to form a copper metal body, and then feed the copper metal body int...

Embodiment 2

[0079] The tap density of 50000g is 5.8g / cm 3 The copper metal powder is preheated to 160°C, and the forming agent is added to the preheated copper metal powder according to the mass ratio of the forming agent to the copper metal powder at 90:10 and mixed for 30 minutes to form a mixture. The molding agent includes 47.8g of stearic acid, 47.8g of antioxidant, 239.3g of paraffin wax, 287.16g of high-density polyethylene, 95.72g of polyethylene-acetate, 95.72g of polyethylene wax and 3972.5g of polyoxymethylene. Among them, high-density polyethylene, polyethylene-acetate, polyethylene wax, and polyoxymethylene are crushed at a low temperature below -50°C in advance to a particle size below 80 μm so as to be at the same particle size level as the copper metal powder. The mixed material is sent to an extruder for extrusion and granulation to obtain a powder injection molding feed. Inject the powder injection molding feedstock into the mold at 160°C to form a copper metal body, an...

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Abstract

The invention discloses a powder injection molding feedstock, and a preparation method and application thereof. The powder injection molding feedstock comprises copper metal powder and a forming agent, and the mass ratio of the copper metal powder to the forming agent is (90-92):(8-10); and the forming agent comprises, by mass, 0.5-2 parts of stearic acid, 0.5-1.5 parts of antioxidants, 4-8 partsof paraffin, 2-8 parts of high density polyethylene, 1.5-4 parts of polyethylene-acetate, 2-4 parts of polyethylene wax, and 75-90 parts of polyformaldehyde. The grain size of each of the polyethylene-acetate, the polyethylene wax and the polyformaldehyde is 100 [mu]m or below and is at the same grain size level with the copper metal powder, so that the forming agent can be melted within the shorttime, the high-temperature mixing time is reduced, and ingredient volatilization is reduced. A cooper metal product prepared through the feedstock is stably shrunk and not prone to deforming after being sintered.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a powder injection molding feed material and its preparation method and application. Background technique [0002] With the continuous improvement and rapid promotion of powder metallurgy industry technology, its application in the manufacturing industry has also risen sharply. Copper-based powder metallurgy parts are also widely used in 3C industries such as auto parts and mobile phone parts. At present, China's cars use copper-based powder metallurgy parts with an average of 18kg per car, and it is still showing an increasing trend; the manufacturing of copper sensor chips in mobile phone parts has also transformed from traditional die-casting technology to powder metallurgy technology. [0003] Traditional copper-based powder metallurgy parts are mainly powder compacted. Powder compression molding is to dry press metal powder with a small amount of binder in a pressing mold ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/115
CPCB22F3/115B22F1/102B22F1/108
Inventor 庞前列张柯张伟明
Owner DONGGUAN HUAJING POWDER METALLURGY
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