块状菱镁矿高温烧结动力学
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摘要
采用高温电炉对块状菱镁矿进行煅烧,研究了块状菱镁矿烧结末期(1600~1800℃)方镁石晶粒长大和致密化行为。结果表明:在烧结末期,随着温度升高,晶界快速移动,气孔"汇聚-排除"的速率和晶界向曲率中心的移动的速率增加,致使颗粒致密化迅速,方镁石晶粒长大明显。温度在1600~1700℃期间,晶界扩散是控制烧结致密化的主导机制,晶粒生长活化能为1.382×103k J·mol-1,晶粒以结晶长大方式为主;温度在1700~1800℃期间,体积扩散是控制烧结致密化的主导机制,晶粒生长活化能为1.164×103k J·mol-1,晶粒以聚晶长大方式为主。随温度的升高,晶粒长大活化能逐渐减小,晶粒长大速率增加。
The block magnesite was calcined using high temperature electric furnace. The grains growth and densification behavior of periclase at last sintering stage of block magnesite( 1600-1800 ℃) were investigated. The results show that with the temperature increasing,the grain boundary moves rapidly,the rate of pore " convergence-exclusion" and the moving speed of the grain boundaries to the curvature center increase,which cause particles densification rapidly and periclase grains grow significantly.During 1600-1700 ℃,grain boundary diffusion is the dominant mechanism of controlling densification,the activation energy of grain growth is 1. 382 × 103 k J · mol- 1and crystallization is the main way of grains growth; At the period of 1700-1800 ℃,volume diffusion is the dominant mechanism of controlling densification,the activation energy of grain growth is 1. 164 × 103 k J·mol- 1and glomerocryst grow is the main way of grains growth. Accompanying temperature increases,the activation energy of grain growth decreases,and the rate of grain growth increases.
The block magnesite was calcined using high temperature electric furnace. The grains growth and densification behavior of periclase at last sintering stage of block magnesite( 1600-1800 ℃) were investigated. The results show that with the temperature increasing,the grain boundary moves rapidly,the rate of pore " convergence-exclusion" and the moving speed of the grain boundaries to the curvature center increase,which cause particles densification rapidly and periclase grains grow significantly.During 1600-1700 ℃,grain boundary diffusion is the dominant mechanism of controlling densification,the activation energy of grain growth is 1. 382 × 103 k J · mol- 1and crystallization is the main way of grains growth; At the period of 1700-1800 ℃,volume diffusion is the dominant mechanism of controlling densification,the activation energy of grain growth is 1. 164 × 103 k J·mol- 1and glomerocryst grow is the main way of grains growth. Accompanying temperature increases,the activation energy of grain growth decreases,and the rate of grain growth increases.
引文
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[2]王兆敏.中国菱镁矿现状与发展趋势[J].中国非金属矿工业导刊,2006,(5)6-8.Wang Z M.Magnesite Present Situation and Development Trend of China[J].China Non-Metallic Mining Industry Herald,2006,(5)6-8(in Chinese).
[3]Fatih Demir,Bünyamin Donmez.Optimization of the Dissolution of Magnesite in Citric Acid Solutions[J].International Journal of Mineral Processing,2008,87(1)60-64.
[4]钟香崇.我国耐火材料发展的战略思考[J].硅酸盐通报,2006,25(2)91-95.Zhong X C.Strategic Thoughts and Predictions on Magnesite Refractories Development in China[J].Bulletin of the Chinese Ceramic Society,2006,25(3)91-95(in Chinese).
[5]赵海鑫.辽宁菱镁矿资源现状及发展意见[J].耐火材料,2009,43(4)291-293.Zhao H X.Magnesite Resource Current Situation and Developing Suggestion of Liaoning[J].Refractories,2009,43(4)291-293(in Chinese).
[6]Liu X W,Feng Y L,Li H R,et al.Thermal Decomposition Kinetics of Magnesite from Thermogravimetric Data[J].Journal of Thermal Analysis and Calorimetry,2012,107(1)407-412.
[7]全跃.菱镁行业如何应对入世挑战[J].国土资源,2002,(1)22-23.Quan Y.How Does Magnesite Industry Meet the Challenge after China Entering WTO-The Development Situation of Magnesite Industry in Liaoning Province[J].Land&resources,2002,(1)22-23(in Chinese).
[8]李楠,陈荣荣.菱镁矿煅烧过程中氧化镁烧结与晶粒生长动力学研究[J].硅酸盐学报,1989,17(1)64-69.Li N,Chen R R.Kinetics of Sintering and Grain Growth of Mg O During Calcination of Magnesite[J].Journal of the Chinese Ceramic Society,1989,17(1)64-69(in Chinese).
[9]吴建国,杜东兴,于陶然,等.菱镁矿煅烧特性的实验研究[J].冶金能源,1997,16(1)50-52.WU J G,DU D X,YU T R,et al.Experimental Investigation on Calcination Characteristics of Magnesite[J].Energy for Metallurgical Industry,1997,16(1)50-52(in Chinese).
[10]Tapan K,Gupta.Sintering of Mg O:Densification and Grain growth[J].Journal of Materials Science,1971,6(1)25-32.
[11]阮建明,黄培云.粉末冶金原理[M].北京:机械工业出版社,2012.
[12]赵惠忠,张文杰,汪厚植.合成镁白云石中Ca O和Mg O晶粒生长动力学[J].耐火材料,1996,30(2)84-87.Zhao H Z,Zhang W J,Wang H Z.The Grain Growth Kinetics of Lime and Periclase Phase in SMD[J].Refractories,1996,30(2)84-84(in Chinese).
[13]Bickerman J J.Surface Chemistry[M].New York Academic Press(1958).
[14]于燕文,牟济宁.稀土金属氧化物对Mg O晶粒生长动力学影响研究[J].世界钢铁,2010,(4)62-66.Yu Y W,Mu J N.Study on Effects of Raremetal Oxide on Mg O Grain Growth Dynamics[J].World Iron&Steel,2010,(4)62-66(in Chinese).
[15]陆佩文.无机材料科学基础[M].湖北:武汉理工大学出版社,1996:291-293.
[16]魏坤,彭珊珊,石燕.纳晶稀土复合氧化物Dy1-xSrxCo O3-yⅡ.固相烧结动力学研究[J].化学学报,1998,(56)780-784.Wei K,Peng S S,Shi Y,Nanocrystalline Rare Earth Mixed Oxides Dy1-xSrxCo O3-yⅡ.Study on the Solid State Sintering Kinetics[J].Acta Chimica Sinica,1998,(56)780-784(in Chinese).