Modelling analysis and experiments of polycrystalline silicon directional solidification in an annular heating field
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Xuli Zhu
Abstract
As a solution to the low convection strength of the Bridgman method and the convection control difficulties of the electromagnetic induction melting method, a novel, large directional solidification device with annular heaters arranged above the crucible is designed. The inhomogeneous heating field causes differences in melt density, intensifies controllable natural convection and accelerates the moving of impurities from the solid–liquid interface to the surface of the melt, thereby improving purification efficiency and reducing energy consumption. Although the temperature field is inhomogeneous, vertical crystal growth can still be achieved. Mathematical analytic modelling is used to explain the principle, and the feasibility is verified by experiments. The results show that high-quality and large bulk silicon ingot (1 m × 1 m × 0.45 m) can be produced at an average solidification rate of 3.68 μm s−1.
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- Contents
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- Original Contributions
- First principles, thermal stability and thermodynamic assessment of the binary Ni–W system
- Experimental evaluation of forming limit diagram and mechanical properties of nano/ultra-fine grained aluminum strips fabricated by accumulative roll bonding
- FSW of bimodal reinforced Al-based composites produced via spark plasma sintering
- Modelling analysis and experiments of polycrystalline silicon directional solidification in an annular heating field
- Effect of flow, heat transfer and magnetic energy on the grain refinement of 7A04 alloy under electromagnetic pulse
- A study on effects of a new two-step strain induced melt activation process on characteristics of Al 7075 alloy
- Synthesis and characterization of mechanically alloyed cerium oxide reinforced Al-4.5Mg alloy composite
- Densification rate and interfacial adhesion of bilayer cemented tungsten carbide and steel
- Short Communications
- Cavitation erosion of 17-4 PH stainless steels following sub-zero treatment
- Investigation on microstructure and thermal properties of in-situ synthesized Cu–ZrO2 nanocomposites
- DGM News
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