In-situ synthesis of Fe Si phases and their effects on the properties of SiC porous ceramics
2019; Elsevier BV; Volume: 784; Linguagem: Inglês
10.1016/j.jallcom.2019.01.031
ISSN1873-4669
AutoresXinming Ren, Beiyue Ma, Changwei Su, Fan Qian, Wengang Yang, Lei Yuan, Jingkun Yu, Guoqi Liu, Hongxia Li,
Tópico(s)Recycling and utilization of industrial and municipal waste in materials production
ResumoSiC ceramics are one of the primary ceramic materials with the limitless applications in the fields of aerospace, energy, and semiconductors. However, insufficient strength and toughness are the fatal weakness for ceramic materials, especially for SiC porous ceramics with high-porosity. To investigate the effects of FexSiy phases on SiC porous ceramics, in this work, FexSiy reinforced SiC porous ceramics were synthesized at 1500 °C-1600 °C for 4 h, with industrial silicon carbide, iron oxide and activated carbon as raw materials. The X-ray diffractometry (XRD), scanning electron microscope (SEM), strength testing, oxidation resistance testing, and thermal shock testing were used to study the effects of the FexSiy reinforcement on a few key properties of the SiC porous ceramics. The results showed that when a small amount of Fe2O3 was added (w(Fe2O3+C) = 23.4%), the cold compressive strength reached 8.8 MPa, and the apparent porosity increased by 10%. The thermal performance and oxidation resistance of the porous ceramics also performed excellently. Meanwhile, the possibility of the FexSiy as a reinforcement for SiC ceramics was confirmed.
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