High Level Material Silicon Metal 553

In the manufacture of silicon for solar cells, boron can be removed more quickly than ever in the silicon metal 553 refining method of silicon metal. In other words, a plasma stream consisting of argon gas with water vapor added to the molten silicon metal is injected onto the molten liquid surface to remove the boron contained in the silicon metal, and a reducing gas is further added to the plasma stream. Boron can be removed more effectively by properly adjusting the mixing ratio of water vapor/reducing gas, gas injection angle and heating method.

1.Mo-based solid solution (Moss) toughened Mo2Ni and silicon metal 553 wear-resistant materials were prepared by laser melting deposition technology, and the wear properties of the alloy in the range of 400~550°C were evaluated on a pin-disc friction and wear testing machine, and the wear surface and subsurface morphology of the alloy were observed with the help of scanning electron microscopy. Moss toughened Mo2Ni3Si metal silicide alloy exhibits an abnormal wear rate-temperature relationship under high temperature sliding conditions, that is, the wear rate decreases with the increase of temperature, and its wear surface is smooth and flat, without the characteristics of microcutting and furrowing, and the Moss dendrites are slightly oxidized at the test temperature. The metal silicide Mo2Ni3Si plays an anti-wear role in the wear process, and the Moss dendrites with good toughness can effectively inhibit the crack propagation and microscopic spalling of the Mo2Ni3Si matrix. The main wear mechanisms of the alloy under high-temperature sliding conditions are soft abrasive wear and slight oxidation of Moss phase.

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