In:
Journal of Advanced Ceramics, Tsinghua University Press, Vol. 10, No. 3 ( 2021-06), p. 493-501
Abstract:
BN/La-Al-Si-O composite ceramics were fabricated by hot-pressed sintering using hexagonal boron nitride (h-BN), lanthanum oxide (La 2 O 3 ), aluminia (Al 2 O 3 ), and amorphous silica (SiO 2 ) as the raw materials. The effects of sintering temperature on microstructural evolution, bulk density, apparent porosity, and mechanical properties of the h-BN composite ceramics were investigated. The results indicated that La-Al-Si-O liquid phase was formed during sintering process, which provided an environment for the growth of h-BN grains. With increasing sintering temperature, the cristobalite phase precipitation and h-BN grain growth occurred at the same time, which had a significant influence on the densification and mechanical properties of h-BN composite ceramics. The best mechanical properties of BN/La-Al-Si-O composite ceramics were obtained under the sintering temperature of 1700 °C. The elastic modulus, flexural strength, and fracture toughness were 80.5 GPa, 266.4 MPa, and 3.25 MPa·m 1/2 , respectively.
Type of Medium:
Online Resource
ISSN:
2226-4108
,
2227-8508
DOI:
10.1007/s40145-020-0451-0
Language:
English
Publisher:
Tsinghua University Press
Publication Date:
2021
detail.hit.zdb_id:
2682430-9
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