Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 6, Pages 2260-2267Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.02.013
Keywords
h-BN composite ceramic; La2O3-Al2O3-SiO2; Liquid-phase sintering; Wettability; Elevated-temperature strength
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Funding
- National Key Research and Development Program of China [2017YFB0703200]
- National Natural Science Foundation of China [51672060, 51621091, 51372050]
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Hexagonal boron nitride (h-BN) composite ceramics were fabricated by hot pressing using h-BN, La2O3, Al2O3 and amorphous SiO2 as the raw materials. The effects of La2O3-Al2O3-SiO2 addition on the bulk density, apparent porosity, microstructural evolution and room/elevated-temperature mechanical properties of h-BN composite ceramics were investigated. The results indicated that liquid phase generated by the reaction of La2O3-Al2O3 and SiO2 exhibited a good wettability with h-BN grains, contributing to fill the pores and improve the densification. Therefore, h-BN composite ceramics with synchronous introduction of La2O3-Al2O3 and SiO2 show the better mechanical properties compared with separate addition of La2O3-Al2O3 or SiO2. h-BN composite ceramic incorporated with 10 vol.% La2O3-Al2O3 and 20 vol.% SiO2 shows the highest room-temperature strength of 266.4 MPa and elevated-temperature strength of 389.0 MPa at 800 degrees C.
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