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34. Improving the Oxidation Resistance of Phenolic Resin Pyrolytic Carbons by In Situ Catalytic Formation of Carbon Nanofibers via Copper Nitrate.

Author

Wu, Zhi, Jiang, Pengcheng, Pang, Hongxing, Cheng, Guanghai, Li, Jiajun, Liu, Hao, Ma, Yan, Dong, Yunjie, and Wang, Zhoufu

Subjects
PHENOLIC resins, CARBON nanofibers, COPPER catalysts, COPPER oxide, COPPER salts, COPPER, PYROLYTIC graphite
Abstract

Phenolic resin pyrolytic carbons were obtained by catalytic pyrolysis of phenolic resin at 500 °C, 600 °C, 700 °C, and 800 °C for 3 h in an argon atmosphere using copper nitrate as a catalyst precursor. The effects of copper salts on the pyrolysis process of phenolic resin as well as the structural evolution and oxidation resistance of phenolic resin pyrolytic carbons were studied. The results showed that copper oxide (CuO) generated from the thermal decomposition of copper nitrate was reduced to copper (Cu) by the gas generated from the thermal decomposition of the phenolic resin. Carbon nanofibers with tapered structures were synthesized by Cu catalysis of pyrolysis gas at 500–800 °C. The catalytic pyrolysis of phenolic resin with Cu increased the graphitization degree and reduced the pore volume of the phenolic resin pyrolytic carbons. The combined action improved the oxidation resistance of phenolic resin pyrolytic carbons. [ABSTRACT FROM AUTHOR]

Published
2024
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44. Optimization of corrosion resistance and mechanical properties of Al2O3‐Cr2O3 refractories for waste incinerator.

Author

An, Yi, Liu, Hao, Wang, Zhoufu, Ma, Yan, and Wang, Xitang

Abstract

The corrosion resistance and mechanical properties directly affects the operation and service life of Al2O3‐Cr2O3 refractories used in waste incinerators. In this study, ZrO2 particles were introduced via vacuum impregnation to adjust microstructure and properties of Al2O3‐Cr2O3 refractories. The results showed that the impregnated ZrO2 particles and increasing impregnation times resulted in the decreased median pore size and increased compactness, and mechanical strengths of refractories were elevated from the inhibited cracks propagation by ZrO2 particles. The decreased amounts of large pores and increased amounts of small pores from the filled ZrO2 particles inhibited penetration of low melting point phases, and the formed CaZrO3 phase from the reactions between corrosion reagent and ZrO2 particles increased the viscosity of penetrated corrosion reagent, resulting in the decreased penetration index from 8.57% to 2.58%. Meanwhile, the filled ZrO2 particles around alumina particles prevented reactions between molten corrosion reagent and alumina, leading to the decreased corrosion index from 3.78% to.74%. The decreased pore size and formation of CaZrO3 phase were primary factors that enhanced the penetration resistance. And formation of wrapped layers from ZrO2 particles around alumina particles presented prominent effects on the strengthened corrosion resistance of Al2O3‐Cr2O3 refractories. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Effect of short carbon fiber content on strength and toughness of Al2O3–C refractories.

Author

Wang, Yulong, Wang, Zhoufu, Wang, Xitang, Liu, Hao, Ma, Yan, Jiang, Pengcheng, Dong, Yunjie, and Niu, Jiwei

Subjects
*THERMAL shock, *CARBON composites, *REFRACTORY materials, *CRACK propagation (Fracture mechanics), *THERMAL resistance, *BOND strengths, *CARBON fiber-reinforced ceramics, *CARBON fibers
Abstract

Short carbon fiber is a promising candidate for reinforcing carbon‐containing refractories at the macro scale due to its excellent high‐temperature stability and mechanical properties. In this work, the microstructure evolution of short carbon fiber and the effect of its addition on the properties of Al2O3–C refractories are investigated. The results show that adding short carbon fiber could affect the distribution of in situ ceramic phases, combined with the cross‐scale reinforcement effect, leading to high strength—the CMOR of short carbon fiber containing refractories could be 23.0% higher than the free ones, while the HMOR could be 22.0% higher. Furthermore, the results suggest that the short carbon fiber containing refractories treated at 1400°C possesses high resistance to the initiation of crack propagation, which could be attributed to the high bonding strength brought by carbon fiber. Noteworthy, adding short carbon fiber could improve thermal shock resistance. The short carbon fiber containing refractories treated at 1300°C could possess a higher residual strength ratio than free ones. For instance, the specimen containing 0.1 wt% short carbon fiber shows the highest residual strength ratio (87.7%). [ABSTRACT FROM AUTHOR]

Published
2024
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