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Densification, phase transformation and fracture toughness were studied in hot-pressed Si_3N_4 seeded by in-houseproduced large, elongated β-Si_3N_4 seeds. A mixture of Y_2O_3-Al_2O_3 was used as the sintering aid. Concentration ofseeds were varied from 0 to 6 wt pct and the sintering time at 1700℃ was varied from 1 to 4 h. Maximum fracturetoughness of 9.0 MPam~(1/2) was measured in samples containing 5 wt pct seeds, hot pressed at 1700℃ for 4 h.
Densification, phase transformation and fracture toughness were studied in hot-pressed Si_3N_4 seeded by in-houseproduced large, elongated β-Si_3N_4 seeds. A mixture of Y_2O_3-Al_2O_3 was used as the sintering aid. Concentration ofseeds were varied from 0 to 6 wt pct and the sintering time at 1700 ° C was varied from 1 to 4 h. Maximum fracture toughness of 9.0 MPam ~ (1/2) was measured in samples containing 5 wt pct seeds, hot pressed at 1700 ° C for 4 h.