Fabrication and characterization of SPS sintered SiC-based ceramic from Y3Si2C2-coated SiC powders
Fabrication and characterization of SPS sintered SiC-based ceramic from Y3Si2C2-coated SiC powders
复制标题
Y3Si2C2 涂层 SiC 粉末 SPS 烧结 SiC 陶瓷的制备和表征
DOI：
10.1016/j.jeurceramsoc.2018.07.054
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发表时间：
2018-12
期刊：
影响因子：
--
通讯作者：
Qing Huang
中科院分区：
文献类型：
--
作者：
Junqi Shao;Mian Li;Keke Chang;Ying Huang;Donglou Ren;Ji Wang;Xiaobing Zhou;Liu He;Feng Huang;Shiyu Du;Jianjun Sha;Zhengren Huang;Qing Huang
采用熔盐法在SiC粉末表面原位合成了y3si2c2涂层，形成了SiC- y3si2c2核壳结构。不同温度下Si-Y-C三元相的相图计算表明，y3si2c2相在SiC中稳定存在，但在1560℃时呈液态。液态y3si2c2解释了放电等离子烧结后SiC陶瓷强化和消失的原因。y3si2c2涂层不仅能有效地改善烧结性能，还能改善所得陶瓷的力学性能和热性能。在1700℃时，当熔盐中Y与SiC的摩尔比为1:4时，块状SiC陶瓷的平均晶粒尺寸为2.5 um，相对密度为99.5%；压痕试验测定的杨氏模量、压痕硬度和断裂韧性分别为451.7 GPa、26.3 GPa和7.9 M Pam1/2；导热系数约为145.9 W/(m K)。晶粒尺寸细、相组成优化、晶界结构改善是合金具有优异的热力学性能的主要原因。
The Y3Si2C2coating wasin-situsynthesized on the surface of SiC powders to form SiC-Y3Si2C2core-shell structure by using a molten salt technique. Phase diagram calculations on Si-Y-C ternary phase at different temperatures well illustrated that the Y3Si2C2phase can be stable with SiC but will be in liquid state at 1560 °C. The liquid Y3Si2C2explained the enhanced consolidation of SiC ceramics and its disappearance after spark plasma sintering. Such Y3Si2C2coating could not only effectively improve the sintering, but also their mechanical and thermal properties of resultant ceramics. Typically, at 1700 °C, the bulk SiC ceramic presented a mean grain size of 2.5 um and relative density of 99.5% when the molar ratio of Y to SiC is 1:4 in molten salts; the Young’s modulus, indentation hardness and fracture toughness measured by indentation test were 451.7 GPa, 26.3 GPa and 7.9 M Pam1/2, respectively; the thermal conductivity is about 145.9 W/(m K). Excellent thermal and mechanical properties could be associated with the fine grain size, optimized phase composition and improved grain boundary structure.
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影响因子：
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作者：
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DOI：
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DOI：
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