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Effects of in situ synthesis of CNTs/SiC w on microstructure and properties of Al 2 O 3 –SiC–C composites
Author(s) -
Gong Wei,
Li Xiangcheng,
Chen Pingan,
Wen Zeyu,
Fang Binxiang,
Zhu Boquan
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13223
Subject(s) - materials science , whiskers , composite material , flexural strength , microstructure , silicon carbide , carbon nanotube , modulus , ball mill , thermal shock
Al 2 O 3 –SiC–C composites were prepared using tabular corundum, ball pitch and silicon carbide as the main raw materials. The carbon nanotubes (CNTs) and SiC whiskers (SiC w ) were in situ synthesized and their effects on the thermo–mechanical properties of Al 2 O 3 –SiC–C composites have been studied. The experimental results indicated that the high yield of SiC w and CNTs with large aspect ratio could be obtained due to addition of Ni(NO 3 ) 2 ·6H 2 O as catalyst in the composites. The cold modulus of rupture values were increased by 24% to 7.2 MPa, and the flexural modulus was increased from 19 GPa to 24 GPa. Additionally, the hot modulus of rupture reached a maximum value of 3.6 MPa, which presented a 71% increase over that of composites without catalyst. After three thermal shock cycles, the residual cold crush strength was improved from 57.1% to 76.9%. It is believed that the enhancement in the thermo‐mechanical properties of Al 2 O 3 –SiC–C composites could be attributed to the reinforcement effect of SiC w and CNTs.