Extrusion forming agent and preparation and use thereof

An extrusion forming and modifier technology, applied in the field of powder metallurgy forming, can solve the problem of low degreasing rate and achieve the effects of high degreasing efficiency, good degreasing and shape retention, and increasing loading capacity

Active Publication Date: 2011-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhao Hongmei et al. reported in Weapon Materials Science and Engineering (2006, 29(5): 59-64): using polypropylene (PP)-polystyrene (PS)-vegetable oil (Oil)-stearic acid (SA) and Polypropylene (PP)-paraffin (PW)-vegetable oil (Oil)-stearic acid (SA)-plasticizer (DOP) two binder systems, using the powder injection molding process to obtain Φ22.5mm brittle tungsten The alloy core, whose injection temperature is 180-200°C, is not suitable for the low-temperature (60-80°C) extrusion molding technology for preparing powder metallurgy samples with large aspect ratio, and the degreasing rate of the injection billet is not good during the solvent degreasing process. high

Method used

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  • Extrusion forming agent and preparation and use thereof
  • Extrusion forming agent and preparation and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take by weight 60% solid paraffin, 10% liquid paraffin, 8% high-density polyethylene, 8% ethylene-vinyl acetate copolymer, 4% plasticizer (dioctyl phthalate) , 1% stearic acid, 6% carnauba wax, 3% modifier (polyethylene wax).

[0027] (2) The temperature of the kneading device was raised to 160° C. and kept warm.

[0028] (3) Put the weighed 8% high-density polyethylene into the mixing device to heat and melt. After it is completely melted, slowly add 8% ethylene-vinyl acetate copolymer, and keep stirring until the two form a uniform molten mixture. .

[0029] (4) Lower the melt kneading temperature to 100° C., add 3% modifier (polyethylene wax) to the above melt blend, and keep stirring to make it blend together.

[0030] (5) Add the prepared solid paraffin, liquid paraffin and carnauba wax into the above-mentioned melt blend together in sequence, stir continuously, and the mixing time is 30 minutes.

[0031] (6) Add the prepared plasticizer and stearic acid int...

Embodiment 2

[0034] (1) Take by weight 55% solid paraffin, 15% liquid paraffin, 10% high-density polyethylene, 10% ethylene-vinyl acetate copolymer, 5% plasticizer (dioctyl phthalate) , 1% stearic acid, 3% carnauba wax, 1% modifier (polyethylene wax).

[0035] (2) Raise the temperature of the kneading device to 170° C. and keep it warm.

[0036] (3) Put the weighed 10% high-density polyethylene into the mixing device to heat and melt. After it is completely melted, slowly add 10% ethylene-vinyl acetate copolymer, and keep stirring until the two form a uniform molten mixture. .

[0037](4) Lower the melt kneading temperature to 110° C., add 1% modifier (polyethylene wax) to the above melt blend, and keep stirring to make it blend into one.

[0038] (5) Add the prepared solid paraffin, liquid paraffin and carnauba wax into the above-mentioned melt blend together in sequence, stir continuously, and the mixing time is 60 minutes.

[0039] (6) Add the prepared plasticizer and stearic acid in...

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Abstract

The invention discloses an extrusion forming agent, and preparation and use thereof, in particular to a forming agent for a tungsten-based alloy or hard alloy or ceramic powder extrusion forming process, and preparation and use thereof. The forming agent comprises 60 to 80 percent of solid and liquid paraffin wax, 3 to 8 percent of carnauba wax, 10 to 20 percent of high density polyethylene and ethylene-vinylacetate copolymer, 1 to 8 percent of plasticizer, 1 to 5 percent of stearic acid and the balance of modifier. In the invention, the drawbacks of long degreasing time, low degreasing conformality and more degreasing defects of extrusion blanks, particularly large-size extrusion blanks, are overcome, the raw materials are cheap and easy to purchase, the component compatibility of the prepared forming agent is high, the forming agent is used in a powder extrusion forming process, the micro structure of the forming agent is uniform, the forming agent has strong interaction force with powder, the formability is high, the quick and flawless degreasing of blanks with a thickness of 40 millimeters can be realize, the production efficiency is improved, and the development of extrusion forming industry is promoted greatly.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy forming, and relates to an extrusion forming agent and its preparation and application in a powder extrusion forming process. Background technique [0002] With the development of society, the demand for powder metallurgy products continues to increase. Powder extrusion molding is a new powder metallurgy forming technology that has developed rapidly in recent years. It has the advantages of unlimited product length, relatively uniform longitudinal density, and high efficiency. One of the most effective ways to bring such products. [0003] In the PEM process, the most important factor restricting the development of parts with large thickness, complex shape, large size, and cross-section changes is the forming agent and its removal process, especially the design and preparation of the forming agent directly determine the quality and application of extruded products , is the key to the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/20
Inventor 刘文胜马运柱蔡青山
Owner CENT SOUTH UNIV
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