Dense, pure SiC monoliths with excellent oxidation resistance sintered at low temperatures and high pressures

Dense, pure SiC monoliths with excellent oxidation resistance sintered at low temperatures and high pressures
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致密、纯 SiC 整体材料在低温高压下烧结,具有优异的抗氧化性

DOI:
10.1016/j.ceramint.2015.07.009
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发表时间:
2015-12
影响因子:
5.2
通讯作者:
Zhou, Yu
Zhou, Yu
中科院分区:
材料科学1区
文献类型:
--
作者:
Wang, Shengjin;He, Peigang;Duan, Xiaoming;Zhou, Yu

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在1100-1200 °C和5GPa下结合机械合金化烧结纯SiC陶瓷整体。机械合金化的SiC粉末几乎是完全无定形的,含有少量的2 nm尺寸的微晶。所得整体材料由非晶和3C-SiC纳米晶(<5 nm)组成,相对密度≥ 93.0%,纳米硬度≥34.0 GPa,弹性模量≥378 GPa。在1500 °C的流动空气中,它们经历的质量变化最小,表明具有优异的抗氧化性。
Pure SiC ceramic monoliths were sintered at 1100–1200 °C and 5 GPa coupled with mechanically alloying. The mechanically alloyed SiC powders are nearly completely amorphous containing a small quantity of 2 nm-sized crystallites. The resulting monoliths consist of amorphous and 3C–SiC nanocrystallites (<5 nm), and offer relative densities ≥93.0%, nanohardnesses ≥34.0 GPa and elastic moduli ≥378 GPa. In the flowing air at 1500 °C, they undergo minimal mass change indicative of excellent oxidation resistance.
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