Strengthening of Al2O3-C slide gate plate refractories with microcrystalline graphite |
| |
| Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070 Wuhan, PR China;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 430081 Wuhan, PR China;3. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084 Beijing, PR China;1. Ceramic Materials Laboratory, Materials Department, Rio Grande do Sul Federal University, Av. Osvaldo Aranha 99/711, Porto Alegre 90035-190, RS, Brazil;2. Siderurgy Laboratory, Metallurgy Department, Rio Grande do Sul Federal University, Av. Bento Gonçalves, 9500/Section 6/321, Porto Alegre 91501-970, RS, Brazil;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;3. Chair of Ceramics, Montanuniversitaet Leoben, A-8700, Austria;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Chair of Ceramics, Montanuniversitaet Leoben, A-8700, Austria |
| |
| Abstract: | The novel carbon sources (including nano-carbon black, carbon nanotubes and graphene oxide nanosheets, etc.) have been extensively researched in low carbon Al2O3-C refractory systems. In the present work, ultrafine microcrystalline graphite (UMCG) and nickel-loaded ultrafine microcrystalline graphite (NMCG) were added into low carbon Al2O3-C slide gate plate refractories to partially replace graphite flake (GF), respectively. The mechanical properties, phase compositions and microstructures were investigated by three-point bending test, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. Also, the reaction mechanisms of in-situ formed ceramic phases were discussed by thermodynamic analysis. The results indicate that the existence of UMCG powders can facilitate the in-situ formation of intertwined ceramic whiskers, leading to increased densification and mechanical properties of low carbon Al2O3-C slide gate plate. Moreover, multi-walled carbon nanotubes and ceramic phases intensively interlock with each other in the Al2O3-C refractories containing NMCG powders, which results in their better mechanical properties; the cold modulus of rupture are 36.03±0.12 MPa and 32.14±0.17 MPa for the specimens after coking at 1200 °C and 1350 °C, respectively. This work puts forward a practical application for the microcrystalline graphite as a candidate carbon source in Al2O3-C slide gate plate refractories. |
| |
| Keywords: | Microcrystalline graphite Mechanical properties Carbon source |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
