推 荐 人:盖艳娇

文献信息1Fangfang Qi, Zhi Wang, Junyan Wu, Hanqing Xu, Jianjun Kou, Liu Zhang. Improved mechanical properties of Al2O3 ceramic by in-suit generated Ti3SiC2 and TiC via hot pressing sintering[J].Ceramics International,2017.

推荐理由作者在氧化铝多相复合材料中加入体积分数为0~30 vol%SiCTi,然后在1600℃且压力为30 MPa的环境下进行真空热压烧结。分析了不同含量的SiCTi对氧化铝多相复合材料的形状以及力学性质的影响。最终表明加入SiC Ti可以增强相或者产生新的相。当加入的SiC的体积分数为20 vol%时,机械性能可以达到最优值。本文对于研究氧化铝陶瓷的烧结具有一定的意义。

AbstractAl2O3 multi-phase composites with different volume fractions of SiC varying from 0 vol% to 30.0 vol% were fabricated by vacuum hot pressing sintering at 1600 under the pressure of 30 MPa for 2.0 h. The aim of this work was to investigate the effect of SiC content on the morphology and mechanical properties of the Al2O3 multi-phase composite. The results show that the addition of SiC and Ti can produce new strengthening and reinforcing phases include Ti3SiC2, TiC, Ti5Si3, which would hamper the migration of grain boundaries and promote sintering. The mechanical performances could reach the comprehensive optimal values for 20.0 vol% SiC, delamination and transgranular fracture being the major crack propagation energy dissipation mechanisms.

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Fig. 1.XRD patterns of the Al2O3 multi-plhase composites wih different volume percentages of SiC additions.

 

Fig. 2 SEM micrographs of the fracture surface for the Al2O3 multi-phase composites with (a) 0 vol%, (b) 5.0 vol%, (c) 10.0 vol%, (d) 15.0 vol%, (e)20.0 vol% and (f) 25.0 vol%, (g) 20.0 vol% SiC additions and (h) enlarged Fig.2(e).

 

Fig. 3 Flexural strength,fracture toughness and harness of the Al2O3 multi-phase composites with different volume percentages of SiC additions. 


文献信息2Ning Song, Hai-bin Zhang, Hong Liu, Jing-zhon Fang. Effects of SiC whiskers on the mechanical properties and microstructure of SiC ceramics by reactive sintering[J]. Ceramics International, 2017.

推荐理由:作者在1650℃下反应烧结制备了预先涂覆的SiC晶须(SiCw/ SiC陶瓷。 分析了SiCw对增韧反应型碳化硅(RBSC)陶瓷的机械性能和形貌的影响。晶须的表面用酚醛树脂预涂,可以在碳化和反应性浸渗烧结后原位形成SiC涂层。该涂层不仅保护了SiC晶须的退化,而且还提供了适度的界面结合环境,这有利于晶须拔出,晶须桥接和裂纹偏转。该文章对于碳化硅陶瓷的机械性能和微观结构的研究具有一定的借鉴意义。

Abstract: As-received and pre-coated SiC whiskers (SiCw)/SiC ceramics were prepared by phenolic resin molding and reaction sintering at 1650 °C. The influence of SiCw on the mechanical behaviors and morphology of the toughened reaction-bonded silicon carbide (RBSC) ceramics was evaluated. The fracture toughness of the composites reinforced with pre-coated SiCw reached a peak value of 5.6 MPa m1/2 at 15 wt% whiskers, which is higher than that of the RBSC with as-received SiCw (fracture toughness of 3.4 MPa m1/2). The surface of the whiskers was pre-coated with phenolic resin, which could form a SiC coating in situ after carbonization and reactive infiltration sintering. The coating not only protected the SiC whiskers from degradation but also provided moderate interfacial bonding, which is beneficial for whisker pull-out, whisker bridging and crack deflection.

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