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| Study on the debinding process of powder metallurgy aluminum alloy prepared by doping EBS lubricants |
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Received:October 18, 2019
Revised:October 22, 2019
Accepted:October 30, 2019
Published Online:May 14, 2020
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| DOI： |
| KeyWord:powder metallurgy, aluminium alloy, thermal debinding, vacuum debinding, EBS |
| Author | Institution |
| Du Xinyang |
State key laboratory of powder metallurgy,central south university |
| Liu Rutie |
State key laboratory of powder metallurgy,central south university |
| Xiong Xiang |
State key laboratory of powder metallurgy,central south university |
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| Abstract: |
| Powder metallurgy aluminum alloy was prepared by cold press-sintering, and the advantages and disadvantages of single/multi-temperature degreasing process were compared. It was found that multi-temperature debinding is better than single-temperature debinding, and the debinding is more thorough. Vacuum debinding and air negative pressure debinding mechanism were studied. Vacuum debinding allows gaseous organic matter and ash that are thermally decomposed by EBS to escape from the surface of the pressed billet and be taken out of the furnace in time. The final carbon content of the alloy is close to the theoretical value of 0.02%. Air negative pressure debinding can make the residual carbon be oxidized and escaped, and the carbon content of the sample is lower than the theoretical value of carbon residue. The effect of debinding process on the mechanical properties of the alloy was studied. The mechanical properties of vacuum debinding alloy were better than that of atmosphere debinding, with the maximum relative density of 97.86% and the maximum tensile strength of 218.06MPa, which were close to the mechanical properties of the alloy without lubricant. Although air negative pressure debinding can lower the carbon content, the raw material powder is oxidized due to the exposure of samples to air during the debinding process, resulting in a serious decline in the mechanical properties of the final alloy. |
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