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High-toughness Si3N4 ceramic preparation method
The invention discloses a high-toughness Si3N4 ceramic preparation method. The high-toughness Si3N4 ceramic preparation method comprises the following steps: (1) adopting Si3N4 powder as a raw material, beta-Si3N4 as seed crystals and Re2O3 as a sintering additive, wherein beta-Si3N4 seed crystals are self-made beta-Si3N4 seed crystals in specific shapes, and are 3.0-5.0 in length-diameter ratio and 0.30-0.60 [mu]m in diameter, Re is any one of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and the mass fractions of Si3N4 powder, beta-Si3N4 crystals and Re2O3 are respectively 75-98 wt%, 1-10 wt% and 1-15 wt%; (2) mixing Si3N4 powder, beta-Si3N4 seed crystals and Re2O3; (3) performing drying and high-temperature hot-press sintering on the mixture to obtain the high-toughness Si3N4 ceramic, wherein the sintering temperature is 1700-1900 DEG C and kept for 0.5-4 h. The high-toughness Si3N4 ceramic has the relatively density being equal to or higher than 95%, the fracture toughness measured by the indentation method is 5-10 MPa.m<1/2>, and the excellent comprehensive mechanical properties of high hardness and bending strength and the like are maintained.
High-toughness Si3N4 ceramic preparation method
The invention discloses a high-toughness Si3N4 ceramic preparation method. The high-toughness Si3N4 ceramic preparation method comprises the following steps: (1) adopting Si3N4 powder as a raw material, beta-Si3N4 as seed crystals and Re2O3 as a sintering additive, wherein beta-Si3N4 seed crystals are self-made beta-Si3N4 seed crystals in specific shapes, and are 3.0-5.0 in length-diameter ratio and 0.30-0.60 [mu]m in diameter, Re is any one of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and the mass fractions of Si3N4 powder, beta-Si3N4 crystals and Re2O3 are respectively 75-98 wt%, 1-10 wt% and 1-15 wt%; (2) mixing Si3N4 powder, beta-Si3N4 seed crystals and Re2O3; (3) performing drying and high-temperature hot-press sintering on the mixture to obtain the high-toughness Si3N4 ceramic, wherein the sintering temperature is 1700-1900 DEG C and kept for 0.5-4 h. The high-toughness Si3N4 ceramic has the relatively density being equal to or higher than 95%, the fracture toughness measured by the indentation method is 5-10 MPa.m<1/2>, and the excellent comprehensive mechanical properties of high hardness and bending strength and the like are maintained.
High-toughness Si3N4 ceramic preparation method
GUO WEIMING (author) / XIONG MING (author) / WU SHANGHUA (author) / JIANG QIANGGUO (author) / GU SHANGXIAN (author)
2015-09-23
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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