Densification mechanism of slag ceramics with different magnesium contents
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摘要: 為了獲得鋼渣制備陶瓷過程中,燒結溫度和保溫時間的影響規律及實現樣品的致密化,在傳統研究關于配方試制及性能檢測的基礎上,以鋼渣、黏土等為主要原料制備出鋼渣陶瓷,針對低鎂樣品和高鎂樣品,研究了燒結溫度和保溫時間對樣品燒結性能的影響及致密化規律.基于燒結速率方程建立了燒結溫度和保溫時間對樣品線性收縮率的函數關系.通過動力學分析,得出不同條件下的燒結激活能,分析認為不同Mg含量下陶瓷樣品的致密化方式為擴散控制,低鎂樣品燒結溫度為1000℃時,物質遷移由表面擴散控制,1100℃時,以體積擴散為主;高鎂樣品在1110℃以上燒結時,主要由液相燒結過程的擴散控制.Abstract: Steel slag is an industrial solid waste generated during the steelmaking process and is an important secondary resource. Since steel slag is rich in aluminosilicates, it can be used to make ceramics. The use of steel slag to prepare ceramics plays an important role in the utilization of it. In this paper, the effect of the sintering temperature and holding time on the sintering process and the densification of products during the preparation of ceramics from steel slag were explored. In particular, low magnesium (Mg) and high Mg samples were chosen for study. The Mg oxide content for the low Mg sample was 2.52% and it was 10.50% for the high Mg sample. Current studies of steel slag ceramics mainly consider the amount of steel slag, the basic formula of the trial, the subsequent performance of the test specimen, the influence of a certain element on the mechanical properties, and the crystal phase of the ceramic. In this work,the preparation of the ceramics with steel slag and clay as main raw materials was considered. By establishing the kinetic description of the sintering process, the sintering activation energy with different magnesium contents could be calculated. The sintering activation energy for the low magnesium and high magnesium ceramic samples was relatively small, and was 36 kJ·mol-1 and 54 kJ·mol-1, respectively. Meanwhile, the densification of the ceramic samples with different magnesium contents was investigated. It is concluded that the material migration mechanism is controlled by surface diffusion when the sintering temperature of the low magnesium sample is 1000℃. At 1100℃, the volume diffusion is the main control mode. When the high magnesium sample is sintered at 1110℃ or higher, the sintering process is mainly controlled by the diffusion of the liquid phase.
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Key words:
- steel slag /
- ceramic /
- densification /
- linear shrinkage /
- kinetic
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參考文獻
[1] Wang Z J, Ni W, Jia Y, et al. Crystallization behavior of glass ceramics prepared from the mixture of nickel slag, blast furnace slag and quartz sand. J Non-Cryst Solids, 2010, 356(31-32):1554 [2] Hwang S, Kim J, Shin H S, et al. Design of glass-ceramic complex microstructure with using onset point of crystallization in differential thermal analysis. Thermochim Acta, 2008, 469(1-2):104 [4] Chang M W, Lyoo S H, Choo H S, et al. Properties of glasses based on the CaO-MgO-SiO2 system for low-temperature co-fired ceramic. Ceram Int, 2009, 35(6):2513 [5] Badiee H, Maghsoudipour A, Raissi Dehkordi B. Use of Iranian steel slag for production of ceramic floor tiles. Advances in Applied Ceramics, 2008, 107(2):111 [6] Amritphale S S, Anshul A, Chandra N, et al. A novel process for making radiopaque materials using bauxite-red mud. J Eur Ceram Soc, 2007, 27(4):1945 [7] Zimmer A, Bergmann C P. Fly ash of mineral coal as ceramic tiles raw material. Waste Manage, 2007, 27(1):59 [12] Karamanova E, Avdeev G, Karamanov A. Ceramics from blast furnace slag, kaolin and quartz. J Eur Ceram Soc, 2011, 31(6):989 [17] Xie D L, Wan L, Song D D, et al. Pressureless sintering curve and sintering activation energy of Fe-Co-Cu pre-alloyed powders. Mater Des, 2015, 87:482 [19] Singh V K. Densification ofalumina and silica in the presence of a liquid phase. J Am Ceram Soc, 1981, 64(10):C-133 [20] Duan S X, Li E Z, Yang H Y, et al. Low temperature sintering kinetics of BaZn2Ti4O11 dielectric ceramic in the presence of a liquid phase. J Alloys Compd, 2017, 699:983 -
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