Mengyao Yang, Yifan Yang, Yunfei Xu, Jizeng Zhao, Wei Zhao, Zhenhua Sun, Ding’ao Yang, Lin Ren, Xiantang Zhao, Hao Yan, Lei Liu, Lei Gong, Zhaohui Huang
{"title":"二次精炼用添加 CaB6 的树脂结合镁基耐火材料的抗氧化性和抗腐蚀性","authors":"Mengyao Yang, Yifan Yang, Yunfei Xu, Jizeng Zhao, Wei Zhao, Zhenhua Sun, Ding’ao Yang, Lin Ren, Xiantang Zhao, Hao Yan, Lei Liu, Lei Gong, Zhaohui Huang","doi":"10.1016/j.ceramint.2024.06.419","DOIUrl":null,"url":null,"abstract":"<p>Excellent properties are required for refractories used for secondary refining because of the harsh service conditions. The current study investigated the effect of calcium boride (CaB<sub>6</sub>) on the properties of magnesium oxide (MgO)‒based refractories. The sample with 0.4 wt.% CaB<sub>6</sub> exhibited excellent properties. It possessed the highest bulk density indicating that a suitable content of CaB<sub>6</sub> can increase the compactness of the refractories. The in-situ formation of aluminum oxycarbonitride (Al<sub>3</sub>CON) at high temperatures in the MgO-based refractories was from the reaction of Al, Al<sub>4</sub>C<sub>3</sub>, AlN, and Al<sub>2</sub>O<sub>3</sub> due to the addition of Al powders, which endowed them with high strength. The refractory containing 0.4 wt.% CaB<sub>6</sub> also exhibited the highest hot modulus of rupture (HMOR) of 26.6 MPa, which was around 2.5 times the strength of commercial MgO‒CaO bricks and 1.5 times that of the samples without CaB<sub>6</sub> addition. In addition, it exhibited the best oxidation resistance revealed by the minimum thickness of the decarbonization zone, because the addition of CaB<sub>6</sub> promoted the formation of a dense magnesium aluminate spinel (MgAl<sub>2</sub>O<sub>4</sub>, MA) layer between the oxidized and non-decarburized zone in the refractories, thereby promoting the resistance of the samples to oxidation. It also exhibited excellent thermal shock resistance, and the residual strength ratio reached 76.6%. The corrosion depth of the sample containing 0.4 wt.% CaB<sub>6</sub> was 9.8% that of the MgO‒CaO bricks. This work indicates a potential alternative for producing high‒performance resin‒bonded MgO-based refractories with CaB<sub>6</sub> in secondary refining furnaces.</p>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Oxidation and corrosion resistance of resin-bonded magnesia-based refractories reinforced by CaB6 addition for secondary refining\",\"authors\":\"Mengyao Yang, Yifan Yang, Yunfei Xu, Jizeng Zhao, Wei Zhao, Zhenhua Sun, Ding’ao Yang, Lin Ren, Xiantang Zhao, Hao Yan, Lei Liu, Lei Gong, Zhaohui Huang\",\"doi\":\"10.1016/j.ceramint.2024.06.419\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Excellent properties are required for refractories used for secondary refining because of the harsh service conditions. The current study investigated the effect of calcium boride (CaB<sub>6</sub>) on the properties of magnesium oxide (MgO)‒based refractories. The sample with 0.4 wt.% CaB<sub>6</sub> exhibited excellent properties. It possessed the highest bulk density indicating that a suitable content of CaB<sub>6</sub> can increase the compactness of the refractories. The in-situ formation of aluminum oxycarbonitride (Al<sub>3</sub>CON) at high temperatures in the MgO-based refractories was from the reaction of Al, Al<sub>4</sub>C<sub>3</sub>, AlN, and Al<sub>2</sub>O<sub>3</sub> due to the addition of Al powders, which endowed them with high strength. The refractory containing 0.4 wt.% CaB<sub>6</sub> also exhibited the highest hot modulus of rupture (HMOR) of 26.6 MPa, which was around 2.5 times the strength of commercial MgO‒CaO bricks and 1.5 times that of the samples without CaB<sub>6</sub> addition. In addition, it exhibited the best oxidation resistance revealed by the minimum thickness of the decarbonization zone, because the addition of CaB<sub>6</sub> promoted the formation of a dense magnesium aluminate spinel (MgAl<sub>2</sub>O<sub>4</sub>, MA) layer between the oxidized and non-decarburized zone in the refractories, thereby promoting the resistance of the samples to oxidation. It also exhibited excellent thermal shock resistance, and the residual strength ratio reached 76.6%. The corrosion depth of the sample containing 0.4 wt.% CaB<sub>6</sub> was 9.8% that of the MgO‒CaO bricks. 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Oxidation and corrosion resistance of resin-bonded magnesia-based refractories reinforced by CaB6 addition for secondary refining
Excellent properties are required for refractories used for secondary refining because of the harsh service conditions. The current study investigated the effect of calcium boride (CaB6) on the properties of magnesium oxide (MgO)‒based refractories. The sample with 0.4 wt.% CaB6 exhibited excellent properties. It possessed the highest bulk density indicating that a suitable content of CaB6 can increase the compactness of the refractories. The in-situ formation of aluminum oxycarbonitride (Al3CON) at high temperatures in the MgO-based refractories was from the reaction of Al, Al4C3, AlN, and Al2O3 due to the addition of Al powders, which endowed them with high strength. The refractory containing 0.4 wt.% CaB6 also exhibited the highest hot modulus of rupture (HMOR) of 26.6 MPa, which was around 2.5 times the strength of commercial MgO‒CaO bricks and 1.5 times that of the samples without CaB6 addition. In addition, it exhibited the best oxidation resistance revealed by the minimum thickness of the decarbonization zone, because the addition of CaB6 promoted the formation of a dense magnesium aluminate spinel (MgAl2O4, MA) layer between the oxidized and non-decarburized zone in the refractories, thereby promoting the resistance of the samples to oxidation. It also exhibited excellent thermal shock resistance, and the residual strength ratio reached 76.6%. The corrosion depth of the sample containing 0.4 wt.% CaB6 was 9.8% that of the MgO‒CaO bricks. This work indicates a potential alternative for producing high‒performance resin‒bonded MgO-based refractories with CaB6 in secondary refining furnaces.
期刊介绍:
Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties.
Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour.
Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.