High Level Material Ferro Silicon Powder

When fine ferro silicon powder (d50=5.229 μm) is nitrided, the reaction is rapid and intense, leading to severe sintering and poor nitriding effect, while coarser silicon iron powder (d50=13.41 μm) shows better nitriding performance; fine silicon iron powder tends to form whisker-like, fibrous, and columnar silicon nitride crystals after nitriding, while coarse silicon iron powder is more likely to form spherical silicon nitride aggregates. The prepared silicon nitride iron contains a large number of nitrogen-filled pores, with Fe3Si and FexSi being surrounded by it, and this structure is beneficial for demonstrating the excellent properties of silicon nitride iron.

1.The overlay welding layer forms a good metallurgical bond with the Q235 substrate; as the content of rare earth ferro silicon powder powder increases, the hard phase in the overlay welding layer becomes more numerous and finer. When the content of rare earth silicon-iron powder is 10% (accounting for the total amount of filler in the core), the hard phase presents a relatively regular hollow hexagonal structure, which is a typical M7C3 hard phase structure. The hardness of the overlay layer significantly increases from HRC 55 to HRC 65, and its weight loss due to wear shows a trend of first decreasing and then increasing. The addition of rare earth silicon-iron powder refines the grains, giving the overlay layer excellent wear resistance. Continuing to increase the content of rare earth silicon-iron powder results in a further reduction in the size of the hard phase, but its quantity does not increase, instead showing a decreasing trend, and the hardness of the overlay layer decreases.

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