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- W4297038079 abstract "Abstract A study has been carried out to examine the effect of LaB 6 addition on the compressive creep behavior of ZrB 2 ‐SiC composites at 1300–1400°C under stresses between 47 and 78 MPa in laboratory air. The ZrB 2 ‐20 vol% SiC composites containing LaB 6 (10% in ZSBCL‐10 and 14% in ZSBCL‐14) besides 5.6% B 4 C and 4.8% C as additives were prepared by spark plasma sintering at 1600°C. Due to cleaner interfaces and superior oxidation resistance, the ZSBCL‐14 composite has exhibited a lower steady‐state creep rate at 1300°C than the ZSBCL‐10. The obtained stress exponent ( n ∼ 2 ± 0.1) along with cracking at ZrB 2 grain boundaries and ZrB 2 ‐SiC interfaces are considered evidence of grain boundary sliding during creep of the ZSBCL‐10 composite. However, the values of n ∼ 1 and apparent activation energy ∼700 kJ/mol obtained for the ZSBCL‐14 composite at 1300–1400°C suggest that ZrB 2 grain boundary diffusion is the rate‐limiting mechanism of creep. The thickness of the damaged outer layer containing cracks scales with temperature and applied stress, indicating their role in facilitating the ingress of oxygen causing oxide scale growth. Decreasing oxidation‐induced defect density with depth to a limit of ∼280 μm, indicates the predominance of creep‐based deformation and damage at the inner core of samples." @default.
- W4297038079 created "2022-09-25" @default.
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- W4297038079 date "2022-10-08" @default.
- W4297038079 modified "2023-10-16" @default.
- W4297038079 title "Effect of LaB<sub>6</sub> addition on compressive creep behavior with simultaneous oxide scale growth of spark plasma sintered ZrB<sub>2</sub>‐SiC composites" @default.
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- W4297038079 doi "https://doi.org/10.1111/jace.18799" @default.
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