High Level Alloys Ferro Silicon Powder

A process method for alloying ferrosilicon powder on the surface of low-carbon steel is characterized in that it has the following processes and steps: firstly, the surface of ordinary cold-rolled low-carbon steel is polished smooth, and then the aging treatment is carried out at 100~150 °C for 5~20 hours to stabilize the structure and size of the steel plate; nttb. The ball milled nano-scale ferrosilicon powder is coated on the surface of mild steel, the thickness of the covering layer is 10μm~100μm, the average particle size of the ferrosilicon powder is 100-110nm, and the chemical composition of the ferrosilicon powder is: Si43.6wt%, Fe56.4wt%; The steel plate covered with the nano layer is placed in a hydrogen atmosphere furnace, and the heating rate is controlled at 10~20 °C/min in this atmosphere, the temperature is raised to 700~1000 °C, the holding time is 2~6h, and then cooled with the furnace; Finally, surface alloying is achieved.

1.Si3N4-Fe3Si composites were prepared by self-creeping combustion method using ferrosilicon powder, Fe-Si3N4 powder and ilmenite powder as raw materials. The Si3N4-Fe3Si composite samples were sintered under nitrogen atmosphere of 1 650, 1 700, 1 750 and 1 800°C. X-ray diffraction, infrared spectroscopy, scanning electron microscopy and Vickers hardness were used to investigate the effects of sintering temperature on the density, porosity, microstructure, phase composition and mechanical properties of Si3N4-Fe3Si composites, and the combustion process of ferrosilisiligo-ilmenite mixture was explored by differential scanning calorimetry (DSC). With the increase of sintering temperature, the density and Vickers hardness of the sample increase, and the compactness of Si3N4-Fe3Si composites increases. However, the flexural strength and fracture toughness first increase and then decrease with the increase of temperature, reaching a maximum value at 1 750°C. At 1 750°C, the density, Vickers hardness, flexural strength and fracture toughness of the specimen were 3.33 g/cm3, 9.85 GPa, 331 MPa and 8.5 MPa·m1/2, respectively. At 1 750°C, the main phases of the Si3N4-Fe3Si sintered specimen were β-Si3N4, Y2Si2O7, Fe3Si and a small amount of Al2O3, which completed the transformation from α-Si3N4 to β-Si3N4, and Fe3Si had good stability under high temperature sintering conditions.

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