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Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
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Debinding and Sintering of an Injection-Moulded Hypereutectic Al⁻Si Alloy
Jiaqi Ni1, Muhuo Yu2, Keqing Han3
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China. jiaqini@mail.dhu.edu.cn.
Materials (Basel, Switzerland)
|May 19, 2018
Summary
Powder injection molding successfully fabricated hypereutectic aluminum-silicon alloy parts. Optimal sintering conditions yielded distortion-free components with good mechanical properties, demonstrating the viability of this PIM process.
Area of Science:
- Materials Science
- Metallurgical Engineering
Background:
- Hypereutectic Al-Si alloys offer desirable properties but present fabrication challenges.
- Powder Injection Moulding (PIM) is a promising technique for complex metal part manufacturing.
Purpose of the Study:
- To investigate the fabrication of hypereutectic Al-Si (20 wt.%) alloy parts using PIM.
- To optimize the debinding and sintering processes for improved mechanical properties and microstructure.
Main Methods:
- A multi-component binder system (HDPE, carnauba wax, stearic acid) was developed for the PIM feedstock.
- Debinding involved solvent extraction and thermal decomposition, with variables like solvent type, temperature, and time investigated.
- Sintering was performed under a nitrogen atmosphere, with temperature and time as key parameters.
Main Results:
- The feedstock contained 83 wt.% metal powders.
- Optimal sintering at 550 °C for 3 hours resulted in distortion-free parts.
- Achieved relative sintered density of ~95.5%, Brinell hardness of 58 HBW, and tensile strength of ~154 MPa.
Conclusions:
- The developed PIM process is effective for producing hypereutectic Al-Si alloy parts.
- Optimized debinding and sintering parameters are crucial for achieving high-quality components.
- The fabricated parts exhibit good mechanical integrity and density.
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