Based on the newly developed bonding system,a new generation of carbon-bonded MgO-C monolithic refractories product with low toxic potential has been developed. Results ofan on-going investigation on properties of MgO...Based on the newly developed bonding system,a new generation of carbon-bonded MgO-C monolithic refractories product with low toxic potential has been developed. Results ofan on-going investigation on properties of MgO-C monolithic refractories with tar-resin as binder are presented. Furthermore,the binder is an extremely strong carbon bonding. Further significant advantages of this system are high oxidation resistance of the highly-ordered carbon structure and the excellent stress-absorbing structure. To improve the strength anderosion resistance,and to decrease evaporation during heating,a preliminary treated tar-resin with higher melting temperature and lower content of volatile component was investigated. The binder specimens were treatedat 800℃ and the mechanical properties of MgO-C re-fractories specimens treated at 200,400,and 1 200℃ were determined.展开更多
The development of efficient bonding agents is one aspect of the advancement of refractories. Based on a newly developed binder system, a new generation of tarresin bonded magnesia carbon products with high performanc...The development of efficient bonding agents is one aspect of the advancement of refractories. Based on a newly developed binder system, a new generation of tarresin bonded magnesia carbon products with high performance has been developed. Furthermore, the binder system characterized by high carbon yield after carbonization results in forming an extremely strong carbon bonding. It can improve refractories properties to get new product with more advantages than old refractories： more economic, lower cost and low toxicity. Tar-resin is not only used in shaped refractories, but also in more refractories types, such as monolithic refractories. Immersion experiments of MgO- C monolithic refractories samples in liquid steel at 1600℃ have been carried out for steel making industry. These experiments showed the formation of a dense and continuous MgO rich layer, on the interface between refractory and steel, and the possible formation of inclusions as large clusters protruding from the refractory surface. For the mechanical properties, the powder was heated up to 1400℃ in air to remove carbon, and was subsequently formed into brick shape. Standard ASTM was used to determine the MOR, porosity and density. It is found that antioxidantmaterials play an important role in improving the mechanical properties.展开更多
文摘Based on the newly developed bonding system,a new generation of carbon-bonded MgO-C monolithic refractories product with low toxic potential has been developed. Results ofan on-going investigation on properties of MgO-C monolithic refractories with tar-resin as binder are presented. Furthermore,the binder is an extremely strong carbon bonding. Further significant advantages of this system are high oxidation resistance of the highly-ordered carbon structure and the excellent stress-absorbing structure. To improve the strength anderosion resistance,and to decrease evaporation during heating,a preliminary treated tar-resin with higher melting temperature and lower content of volatile component was investigated. The binder specimens were treatedat 800℃ and the mechanical properties of MgO-C re-fractories specimens treated at 200,400,and 1 200℃ were determined.
文摘The development of efficient bonding agents is one aspect of the advancement of refractories. Based on a newly developed binder system, a new generation of tarresin bonded magnesia carbon products with high performance has been developed. Furthermore, the binder system characterized by high carbon yield after carbonization results in forming an extremely strong carbon bonding. It can improve refractories properties to get new product with more advantages than old refractories： more economic, lower cost and low toxicity. Tar-resin is not only used in shaped refractories, but also in more refractories types, such as monolithic refractories. Immersion experiments of MgO- C monolithic refractories samples in liquid steel at 1600℃ have been carried out for steel making industry. These experiments showed the formation of a dense and continuous MgO rich layer, on the interface between refractory and steel, and the possible formation of inclusions as large clusters protruding from the refractory surface. For the mechanical properties, the powder was heated up to 1400℃ in air to remove carbon, and was subsequently formed into brick shape. Standard ASTM was used to determine the MOR, porosity and density. It is found that antioxidantmaterials play an important role in improving the mechanical properties.
