【摘 要】
：
ZrB2 ceramics with various hexagonal BN (hBN) additions up to 37 vol％ were reactively densified by spark plasma sintering using powder mixtures containing ZrB2,Z
【机 构】
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State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University
论文部分内容阅读
ZrB2 ceramics with various hexagonal BN (hBN) additions up to 37 vol％ were reactively densified by spark plasma sintering using powder mixtures containing ZrB2,ZrN and boron.ZrN-boron based additives effectively promoted the densification process,ZrB2 ceramics reached ＞99％ relative density at 2000 ℃and an applied pressure of 60 MPa with only 5 vol％ in-situ formed hBN,whereas the relative density of pure ZrB2 was only 91.2％ at the same conditions.Increasing the hBN contents,the morphology of hBN grains gradually changed from quasi-spherical to flake dominated,which has substantial influence on their mechanical properties,In-situ ZrB2-10 vol％ hBN ceramics demonstrated high flexural strength of 597 ± 22 MPa,relatively low Young's modulus of 406 GPa and good machinability,especially for the impressively large strain to failure (1.47 × 10-3) which is superior to most of their counterparts in the ZrB2 based particulate reinforced ceramics.
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