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Preparation method for compact silicon carbide ceramics free of boron or rare earth elements
The invention relates to a preparation method for compact silicon carbide ceramics free of boron or rare earth elements. The preparation method comprises the steps of 1, evenly mixing, drying, grinding and screening an aluminum source, a carbon source, silicon carbide powder and absolute ethyl alcohol to obtain mixed powder, pressing the mixed powder to obtain ceramic biscuits; 2, carrying out heating and pyrolysis on the ceramic biscuits in vacuum at 650DEG C-1050 DEG C; 3, subjecting the ceramic biscuits to a carbon thermal reduction reaction in nitrogen atmosphere at 1550 DEG C-1750 DEG C; 4, sintering the ceramic biscuits obtained after the carbon thermal reduction reaction in inert atmosphere at 2050 DEG C-2300 DEG C to obtain the compact silicon carbide ceramics. The silicon carbide ceramics prepared through the preparation method contain Si, Al, C, O and N elements all of which have small neutron-absorption cross-sections, and the silicon carbide ceramics do not contain the B or rare earth elements having large neutron-absorption cross-sections.
Preparation method for compact silicon carbide ceramics free of boron or rare earth elements
The invention relates to a preparation method for compact silicon carbide ceramics free of boron or rare earth elements. The preparation method comprises the steps of 1, evenly mixing, drying, grinding and screening an aluminum source, a carbon source, silicon carbide powder and absolute ethyl alcohol to obtain mixed powder, pressing the mixed powder to obtain ceramic biscuits; 2, carrying out heating and pyrolysis on the ceramic biscuits in vacuum at 650DEG C-1050 DEG C; 3, subjecting the ceramic biscuits to a carbon thermal reduction reaction in nitrogen atmosphere at 1550 DEG C-1750 DEG C; 4, sintering the ceramic biscuits obtained after the carbon thermal reduction reaction in inert atmosphere at 2050 DEG C-2300 DEG C to obtain the compact silicon carbide ceramics. The silicon carbide ceramics prepared through the preparation method contain Si, Al, C, O and N elements all of which have small neutron-absorption cross-sections, and the silicon carbide ceramics do not contain the B or rare earth elements having large neutron-absorption cross-sections.
Preparation method for compact silicon carbide ceramics free of boron or rare earth elements
LIU GUILING (author) / SU BIZHE (author) / HUANG ZHENGREN (author) / LIU XUEJIAN (author) / CHEN ZHONGMING (author) / YANG YONG (author) / YAO XIUMIN (author)
2015-09-23
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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