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- W2034345377 abstract "Abstract A series of Si 3 N 4 /BAS compositions of 20, 40, 60, 80 and 100 wt.% barium aluminosilicate (BAS) were hot-pressed at relatively low sintering temperature (1450 °) for a 30–60 min soak at a pressure of 10–20 MPa under N 2 atmosphere. Elongated rod-like β-Si 3 N 4 whiskers were formed for compositions with 20–80 wt.% BAS. No metal ions were dissolved in Si 3 N 4 crystal lattices. The microstructure varied with composition. The relative content of rod-like β-Si 3 N 4 whiskers increased with increasing BAS content. Densities of all the specimens with BAS contents more than 20 wt.% were >99% of the theoretical density. With a 30 min soak, the room temperature (RT) flexural strength increased from 259.1 to 323.0 MPa from 20 to 40 wt.% BAS and then decreased to 70.6 MPa for 100 wt.% BAS. The fracture toughness increased from 2.40 to 3.24 MPa m 1/2 from 20 to 60 wt.% BAS and then decreased to 1.78 MPa m 1/2 for 100 wt.% BAS. With a 60 min soak, the RT flexural strength of 40 wt.% BAS without monoclinic BAS seeds was 379.6 MPa and retained 87.9, 93.8 and 94.2% of their RT values at 1000, 1100 and 1200 °C, respectively; in contrast, the RT flexural strength of 40 wt% BAS containing 8 wt% BAS seeds was 519.4 MPa and retained 87.3, 63.0 and 51.9% of their RT values at 1000, 1100 and 1200 °C, respectively. Monoclinic BAS seeds had little effect in accelerating the hexagonal→monoclinic phase transformation of BAS glass ceramics." @default.
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- W2034345377 date "2002-01-01" @default.
- W2034345377 modified "2023-09-26" @default.
- W2034345377 title "Low temperature hot-pressed BAS matrix composites reinforced with in situ grown Si3N4 whiskers" @default.
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- W2034345377 doi "https://doi.org/10.1016/s0272-8842(01)00057-8" @default.
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