A dense and fine-grained SiC/Ti3Si(Al)C2 composite and its high-temperature oxidation behavior
A dense and fine-grained SiC/Ti3Si(Al)C2 composite and its high-temperature oxidation behavior
复制标题
DOI：
10.1016/j.jeurceramsoc.2012.04.029
复制
发表时间：
2012-09
影响因子：
5.7
通讯作者：
Shibo Li;G. Song;Yang Zhou
中科院分区：
文献类型：
--
作者：
Shibo Li;G. Song;Yang Zhou
以Si、TiC和Al粉末为烧结添加剂，在1500°C、30 MPa、Ar气氛下原位热压2 h，合成了致密的SiC/Ti 3Si（Al）C2复合材料。该复合材料具有细晶、均匀的显微组织，Ti 3Si（Al）C2的晶粒尺寸为5μm，SiC的晶粒尺寸为1μm。SiC/Ti 3Si（Al）C2复合材料具有更好的抗氧化性能，在1200°C和1300°C下的抛物线速率常数分别为4.57×10− 8 kg 2/m4/s和1.31×10− 7 kg 2/m4/s。本研究为SiC/Ti 3Si（Al）C2复合材料氧化膜中非晶相的形成提供了实验依据。利用X射线衍射仪和扫描电镜对SiC/Ti 3Si（Al）C2复合材料和氧化膜的显微结构和相组成进行了分析。并对提高抗氧化性能的机理进行了讨论。
A dense SiC/Ti3Si(Al)C2composite was synthesized by in situ hot pressing powders of Si, TiC and Al as a sintering additive at 1500°C for 2h under 30MPa in Ar atmosphere. This composite has a fine-grained and homogeneous microstructure with grain sizes of 5μm for Ti3Si(Al)C2and of 1μm for SiC. The SiC/Ti3Si(Al)C2composite possesses an improved oxidation resistance, with parabolic rate constants of 4.57×10−8kg2/m4/s at 1200°C and 1.31×10−7kg2/m4/s at 1300°C. This study provides an experimental evidence to confirm the formation of amorphous phases in the oxide scale of the SiC/Ti3Si(Al)C2composite. Microstructure and phase composition of the SiC/Ti3Si(Al)C2composite and oxide scales were identified by X-ray diffractometry and scanning electron microscopy. The mechanism for the enhanced oxidation resistance has been discussed.