Manufacturing method of high abrasion resistant silicon nitride (Si_3N_4) sintered body

摘要

The present invention relates to a method for manufacturing a silicon nitride sintered body having a high sintered body structure and high wear resistance by controlling the amount of sintering aid added to the silicon nitride powder and controlling the sintering atmosphere gas pressure in two steps.;The present invention relates to a method for producing a silicon nitride sintered body, which comprises preparing a shaped body by adding 4-10 wt% of a sintering auxiliary agent to silicon nitride powder and then heating the shaped body at a temperature range of 1600-1800 [deg.] C After sintering for 10-30 minutes at a gas pressure of 2-5 atmospheres with a sintering density of 95%, the nitrogen gas pressure is further reduced to 30-40 seconds by sintering at a pressure of 50-100 atm, And a method of manufacturing a silicon nitride sintered body having high wear resistance.