Ferro Silicon Nitride
Ferrosilicon nitride takes Si3N4 as essential component,accompanying with free iron, non-nitrided ferrosilicon and other mixture. While commercial ferrosilicon nitride for fire retardance is grey white (or dark brown) powder, and ferrosilicon nitride for steelmaking is grey white grains.
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Parameters |
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Chemical Composition(%) |
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| Element | Si3N4 | Si | N | Fe | Al+Ca |
| Content | 75-80 | 47-51 | 30-33 | 12-16 | ＜2.5 |
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Granulanty Distribution |
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Powder Product(%) |
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| Grain Diameter | -45μm | -45~-75μm | +75μm~-150μm | +150μm | -75μm |
| Fine Powder | ＞80 | 5~1.5 | ＜3 | 0 | 95-100 |
| Common Powder | 70~80 | 10~20 | 8~15 | ＜3 | 85~95 |
| Coarse Powder | 60~70 | 10~16 | 10~16 | ＜8 | 65~80 |
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Granular Product(%) |
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| Variety | Grain Diameter | Percentage | |||
| Fine grain | 3~5㎜ | ＞90 | |||
| Common grain | 3~10㎜ | ＞90 | |||
| Coarse grain | 10~50㎜ | ＞90 | |||
Applications
Powder ferrosilicon nitride is mainly used in plugging stemming of blast furnace, few in iron runner material or other amorphous refractories. With increasing requirement on quality of refractories, more and more refractory products make use of ferrosilicon nitride or silicon nitride.
Grain ferrosilicon nitride is mostly suitable for oriented silicon steel or steels which are increased strength with nitrides (HRB400 steel bar for example).