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Liquid‐Phase Assisted Engineering of Highly Strong SiC Composite Reinforced by Multiwalled Carbon Nanotubes
Advanced Science ( IF 15.1 ) Pub Date : 2020-09-21 , DOI: 10.1002/advs.202002225
Yuchi Fan 1, 2 , Erhong Song 3 , Tufail Mustafa 1, 4 , Ruicong Liu 1 , Pengpeng Qiu 1 , Weiwei Zhou 5 , Zhenxing Zhou 5 , Akira Kawasaki 5 , Keiichi Shirasu 6 , Toshiyuki Hashida 7 , Jianjun Liu 3 , Lianjun Wang 1 , Wan Jiang 1, 2 , Wei Luo 1, 2
Affiliation  

Despite the ultrahigh intrinsic strength of multiwalled carbon nanotube (MWCNT), the strengthening effect on ceramic matrix composite remains far from expectation mainly due to the weak load transfer between the reinforcement and ceramic matrix. With the assistance of the in situ pullout test, it is revealed that the liquid‐phase sintering (LPS) can serve as a novel strategy to achieve effective load transfer in MWCNT reinforced ceramic matrix composites. The YAlO3 formed liquid phase during spark plasma sintering of SiC composite greatly facilitates radical elastic deformation of MWCNT, leading to highly increased interfacial shear strength (IFSS) as well as interlayer shear resistance (ISR) of nested walls. The liquid phase with superior wettability can even penetrate into the defects of MWCNT, which further increases the ISR of MWCNT. Moreover, the first‐principles calculation indicates that the oxygen terminated YAlO3 phase displays much stronger bonding compared with SiC matrix, which is also responsible for the large IFSS in the composite. As a result, as high as 30% improvement of bending strength is achieved in the composite with only 3 wt% MWCNT in comparison to the monolithic ceramic, manifesting the unprecedented strengthening effect of MWCNT assisted by LPS.

中文翻译:

多壁碳纳米管增强的高强度SiC复合材料的液相辅助工程

尽管多壁碳纳米管(MWCNT)的固有强度极高,但对陶瓷基复合材料的强化效果仍远未达到预期,这主要是由于增强材料和陶瓷基体之间的载荷传递较弱。借助原位拉拔试验表明,液相烧结(LPS)可以作为一种新颖的策略,以有效地转移MWCNT增强陶瓷基复合材料的载荷。YAlO 3SiC复合材料的火花等离子烧结过程中形成的液相大大促进了MWCNT的自由基弹性变形,从而导致嵌套壁的界面剪切强度(IFSS)和层间剪切强度(ISR)大大提高。具有优异润湿性的液相甚至可以渗透到MWCNT的缺陷中,这进一步增加了MWCNT的ISR。此外,第一性原理计算表明,与SiC基体相比,氧封端的YAlO 3相显示出更强的结合力,这也是复合材料中较大的IFSS的原因。结果,与单块陶瓷相比,在仅具有3wt%的MWCNT的复合物中实现了高达30%的弯曲强度的改善,表现出由LPS辅助的MWCNT的空前的增强效果。
更新日期:2020-11-04
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