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Hexagonal boron nitride-ytterbium silicon oxide-silicon dioxide composite material and preparation method
The invention relates to the field of ceramic-base composite materials, in particular to a hexagonal boron nitride (h-BN)-ytterbium silicon oxide (Yb2Si2O7)-silicon dioxide (SiO2) composite material and a preparation method thereof. The volume percentage of the hexagonal boron nitride phase in the composite material is 50-95 percent, the sum of the volume percentages of the ytterbium silicon oxide phase and the silicon dioxide phase is 5-50 percent, and the volume percentages of the ytterbium silicon oxide phase and the silicon dioxide phase are adjusted as required between 5 percentage and 50 percentage. Boron nitride powder, diytterbium trioxide powder and silicon dioxide powder are used as raw materials, are mixed through a physical mechanical method, are dried again, are screened, are held in a graphite mold for cold press molding and are sintered in a hot press furnace in which a protective atmosphere is introduced. By using the method, the hexagonal boron nitride-ytterbium silicon oxide-silicon dioxide composite material can be prepared through in-situ synthesis. The best performance is that the Young modulus is 105GPa, the Vickers hardness is 1.0GPa, the bending strength reaches 256MPa, the compression strength reaches 843MPa, the dielectric constant is 4.8, and the dielectric loss is 0.00086.
Hexagonal boron nitride-ytterbium silicon oxide-silicon dioxide composite material and preparation method
The invention relates to the field of ceramic-base composite materials, in particular to a hexagonal boron nitride (h-BN)-ytterbium silicon oxide (Yb2Si2O7)-silicon dioxide (SiO2) composite material and a preparation method thereof. The volume percentage of the hexagonal boron nitride phase in the composite material is 50-95 percent, the sum of the volume percentages of the ytterbium silicon oxide phase and the silicon dioxide phase is 5-50 percent, and the volume percentages of the ytterbium silicon oxide phase and the silicon dioxide phase are adjusted as required between 5 percentage and 50 percentage. Boron nitride powder, diytterbium trioxide powder and silicon dioxide powder are used as raw materials, are mixed through a physical mechanical method, are dried again, are screened, are held in a graphite mold for cold press molding and are sintered in a hot press furnace in which a protective atmosphere is introduced. By using the method, the hexagonal boron nitride-ytterbium silicon oxide-silicon dioxide composite material can be prepared through in-situ synthesis. The best performance is that the Young modulus is 105GPa, the Vickers hardness is 1.0GPa, the bending strength reaches 256MPa, the compression strength reaches 843MPa, the dielectric constant is 4.8, and the dielectric loss is 0.00086.
Hexagonal boron nitride-ytterbium silicon oxide-silicon dioxide composite material and preparation method
CHEN JIXIN (Autor:in) / ZHANG XI (Autor:in) / KANG XIAOLU (Autor:in) / WANG XUAN (Autor:in) / YU SHUILIN (Autor:in) / ZHAO ZHEN (Autor:in) / MIAO LEI (Autor:in) / ZHOU YANCHUN (Autor:in)
05.08.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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