Improved oxidation resistance of SPS sintered Si2BC3N ceramics with disilicides (MoSi2, HfSi2, TaSi2) addition
Improved oxidation resistance of SPS sintered Si2BC3N ceramics with disilicides (MoSi2, HfSi2, TaSi2) addition
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添加二硅化物（MoSi2、HfSi2、TaSi2）提高 SPS 烧结 Si2BC3N 陶瓷的抗氧化性
DOI：
10.1016/j.ceramint.2020.04.127
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发表时间：
2020-04
影响因子：
5.2
通讯作者：
Jung In-Ho
中科院分区：
文献类型：
--
作者：
Liao Ning;Ji Zixu;Yang Zhihua;Jia Dechang;Li Yawei;Jung In-Ho
尽管Si2BC3N陶瓷在干燥和潮湿空气中的高温（1000-1400℃）下具有优异的抗氧化性，但由于挥发性CO， b2o3和SiO的快速逸出，在较高温度（1400℃以上）下的抗氧化性仍然受到挑战。一般来说，形成稳定连续的保护层是提高高温下抗氧化性能的关键。考虑到Si2BC3N陶瓷的化学相容性和氧化后形成的非挥发性氧化物，本工作主要研究了添加MoSi2、hfsi2和TaSi2等二硅酸盐对SPS烧结Si2BC3N陶瓷相组成和抗氧化性能的影响。结果表明：纳米二硅酸盐在烧结过程中会转化为碳化物（MoC、Mo5Si3和TaC）和氧化物（TaO、HfO2）；Mo和Hf相关相优先氧化，形成稳定的氧化层，显著提高了材料的抗氧化性，在1600℃下保温3 h，氧化层厚度小于10 μm。
Although Si2BC3N ceramics have excellent oxidation resistance under high temperature (1000–1400 °C) in both dry and moist air, the oxidation resistance under higher temperatures (above 1400 °C) are still challenged due to the quick escape of volatile CO, B2O3and SiO. Generally, the formation of stable and continuous protective layer is critical for improving the oxidation resistance under high temperature. Given the chemical compatibility and the formation of nonvolatile oxides after oxidation, the present work mainly investigated the influences of disilicides addition, including MoSi2, HfSi2and TaSi2, on the phase composition and oxidation resistance of Si2BC3N ceramics sintered by SPS. The results showed that nano sized disilicides would transform into carbides (MoC, Mo5Si3, and TaC) and oxides (TaO, HfO2) during sintering process. The preferential oxidation of Mo and Hf related phases and the formation of much stable oxidation layer could improve the oxidation resistance significantly, where the oxidation layer thickness was less than 10 μm after testing at 1600 °C for 3 h.
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影响因子：
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作者：
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影响因子：
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DOI：
10.1016/s0921-5093(99)00593-6
发表时间：
2000-02
影响因子：
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