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Influence of processing parameters on the phase composition of ZrN-Si_3N_4 synthesized from zircon

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Rare Metals 2009年第4期28卷 367-371页

作者： ma beiyue yu jingkun School of materials and Metallurgy Northeastern University Shenyang 110004 China

The optimum parameters were determined for synthesizing ZrN-Si3N4 composite powder from zircon by carbothermal reduction-nitridation （CTRN） process. The samples were prepared by mixing the carbon black of an average particle size less than 30 μm and the zircon of 40 μm with C/ZrSiO4 mass ratios of 0.2, 0.3, 0.4, and 0.5. The prepared samples were subjected to the CTRN process at temperatures of 1673, 1723, 1753, and 1773 K for 6, 9, and 12 h. The CTRN process was conducted in an atmosphere-controlled tubular furnace in a nitrogen gas flow of 1.0 L/rain. All the products were examined by X-ray powder diffraction to determine the transformation. The results showed that the proper transformation of ZrN-Si3N4 occurred at 1773 K for 12 h with a C/ZrSiO4 mass ratio of 0.4.

关键词： inorganic non-metal materials nitrides carbothermal reduction-nitridation zircon processing parameters phase composition

Synthesis of ZrO_2-SiC Composite by Carbothermal Reduction of Zircon

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China's Refractories 2007年第4期16卷 17-20页

作者： ma beiyue yu jingkun School of materials and Metallurgy Northeastern University Shenyang 110004 China

Zircon （mesh size ≤ 44μm ） and carbon black （mesh size ≤30μm ） were used as the starting materials, weighed with re（zircon）： re（carbon black） of 100 ： 20 and mixed fully. The specimens with the diameter of 20ram and length of 5ram were prepared by pressing at 100 MPa, then dried at 120℃ for 12h, put into a furnace with 1. 5L ·min^-1 argon gas and fired at 1450℃, 1500℃, 1550℃, 1600℃ and 1650℃ for 4h, respectively. The chemical composition, phase composition and microstructure of the specimens were studied by chemical analysis, X-ray diffraction and scanning electronic microscope, and the carbothermal reduction reaction process was discussed by thermodynamic analysis. The results showed that the ZrO2-SiC composite could be synthesized by carbothermal reduction reaction using zircon and carbon black as the starting materials in argon atmosphere. The composite with different composition was obtained by controlling the firing temperature and partial pressure of CO gas. The proper temperature to synthesize ZrO2-SiC composite was 1600℃ in this experiment.

关键词： Carbothermal reduction Zircon ZrO2-SiC composite

Influences of ZrO_2-SiC Composite Powder and Commercial SiC on Properties of Al_2O_3-C Refractories

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China's Refractories 2008年第3期17卷 18-21页

作者： ma beiyue yu jingkun SUN Yong ZHU Qiang School of materials and Metallurgy Northeastern University Shenyang 110004 China

In order to improve oxidation resistance and ther- mal shock resistance of Al2O3-C refractories, two groups of specimens were prepared with phenolic resin as binder, adding 0, 2 wt% , 4 wt% and 6 wt% commercial SiC or ZrO2-SiC composite powder synthesized from zircon respectively to Al2O3- C refractories, pressing at 200 MPa, drying fully at 250℃, and then carbon embedded firing at 1400℃ for 2 h. Oxidation resistance and thermal shock resistance were researched, phase composition was analyzed by XRD. The results showed that the oxidation of SiC in additives could protect carbon in specimens effectively and thus decreased the mass loss ratio and oxidation area, and improved the oxidation resistance of the specimen. Thermal shock resistance was improved owing to the micro crack toughening of ZrO2 and grain toughening of SiC. In this experiment, the specimens with 6 wt% ZrO2 -SiC composite powder or 6 wt% SiC powder had the best oxidation resistance and thermal shock resistance.

关键词： Alumina - carbon refractories Zirconia-silicon carbide composite powder Oxidation resist-ance Thermal shock resistance

Synthesis of Al_2O_3-SiC Composite and Its Effect on the Properties of Low-carbon MgO-C Refractories

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Journal of materials Science & Technology 2010年第8期26卷 715-720页

作者： beiyue ma Qiang Zhu Yong Sun jingkun yu Ying Li School of materials and Metallurgy Northeastern University Shenyang 110004 China Faculty of Engineering University of Wollongong Wollongong NSW 2522 Australia

Al2O3-SiC composite was synthesized with pyrophyllite and natural graphite as raw materials by carbothermal reduction reaction under argon atmosphere. The effect of synthesis temperature on phase composition and microstructure was investigated. Low-carbon MgO-C refractories were prepared by using the synthesized Al2O3-SiC composite as additive. The effect of its addition on the slag penetration and corrosion resistance as well as oxidation resistance of the refractories was investigated, and the slag resistance and oxidation resistance mechanisms of the Al2O3-SiC composite were also discussed. The results show that the synthesis temperature has a great influence on preparation of Al2O3-SiC composite. The Al2O3-SiC composite can be synthesized at 1873-1973 K under argon atmosphere, with pyrophyllite and natural graphite as raw materials, and particle sizes of the composite synthesized at 1973 K are mainly distributed as 1-2 μm. The slag penetration and corrosion resistance of low-carbon M80-C refractories can be remarkably improved by adding the synthesized Al2O3-SiC composite, and the oxidation resistance has an improvement to some extent. The increase of slag viscosity and the formation of MgAl2O4 can effectively inhibit the slag penetration and corrosion for the refractories.

关键词： Oxide-nonoxide composite Carbothermal reduction Penetration Corrosion Oxidation resistance Refractories

Preparation of ZrN(ZrON)-SiAION Composite Ceramics via a Pressureless Sintering Process

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China's Refractories 2014年第4期23卷 45-48页

作者： ma beiyue LI Ying LU Zhongxin yu jingkun School of materials&Metallurgy Northeastern University

ZrN-SiAlON composite materials were synthesized at 1 550 ℃ for 6 h via a carbothermal reduction nitridation route using fly ash （≤74 μm）,zircon （≤ 44 μm） and active carbon as starting *** processed ZrN-SiAlON composite micropowders were mixed with polyvinyl alcohol as binder to prepare ZrN （ZrON）-SiAlON composite ceramics by carbon-embedded pressureless firing at 1 450,1 500 and 1 550 ℃ for 1 h,*** of firing temperature on the phase compositions,microstructure and sintering properties of the ceramics were *** results show that：（1） β-SiAlON based composite ceramics with different compositions can be prepared by controlling firing temperature,and the main crystalline phases of the specimen fired at 1 550 ℃ for 1 h involve ZrN,ZrON and β-SiAlON （z =2,Si4Al2O2N6）; （2） ZrN （ZrON）,β-SiAlON and a Fe-Si based compound can be observed in the microstructures of the specimens fired at different *** （ZrON） particles distribute homogeneously in the β-SiAlON matrix; （3） raising firing temperature can increase the shrinkage ratio of the ceramics,and the volume shrinkage ratio increases from 19.4％ to 40.3％ when the firing temperature rises from 1 450 to 1 550 ℃.

关键词： ZrN (ZrON)-SiAlON composite ceramics pressureless sintering process fly ash zircon

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耐火材料的抗碱侵蚀性研究进展

材料导报 2024年第11期38卷 66-77页

作者：钱凡李红霞郭海荣于建宾李坚强马渭奎马北越杨文刚河南科技大学材料科学与工程学院河南洛阳471023 中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室河南洛阳471039 江苏省沙钢钢铁研究院有限公司江苏苏州215625 东北大学冶金学院沈阳110819 北京科技大学材料科学与工程学院北京100083

碱侵蚀是高炉、回转窑、匣钵等高温装置重要部位损毁的主要原因,不同于熔渣导致的溶解侵蚀和物理冲刷导致的蚀损,碱侵蚀有着其特殊的作用机制。本文首先介绍了碱的物理性质并计算了其与耐火氧化物反应的吉布斯自由能和体积效应,以此为... 详细信息

碱侵蚀是高炉、回转窑、匣钵等高温装置重要部位损毁的主要原因,不同于熔渣导致的溶解侵蚀和物理冲刷导致的蚀损,碱侵蚀有着其特殊的作用机制。本文首先介绍了碱的物理性质并计算了其与耐火氧化物反应的吉布斯自由能和体积效应,以此为出发点综述了碱对典型高温装置关键部位的侵蚀过程及机制,并概述了碱性耐火材料、铝硅系耐火材料、非氧化物耐火材料、新型合成材料抗碱侵蚀的研究与应用新进展,同时对比了几种国内外抗碱侵蚀标准或方法,最后对耐火材料抗碱侵蚀性研究提出了几点建议。

关键词：碱金属炉衬匣钵 Al_(2)O_(3)-MgO-CaO系材料抗碱评价

Phase Formation and Process Analysis of SiC-Al_2O_3-Al_6Si_2O_(13) Composite Powder via Carbothermal Reduction of Fly Ash at 1 550 ℃

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China's Refractories 2016年第4期25卷 33-37页

作者： ZHANG Bowen ma beiyue YIN yue LI Shiming ZHANG Zhan LI Guangqiang yu jingkun School of Metallurgy Northeastern University The State Key Laboratory of Refractories and Metallurgy Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of EducationWuhan University of Science and Technology

Silicon carbide（SiC）-alumina（Al_2O_3）-mullite（Al_6Si_2O_（13）） composite powder was successfully synthesized at 1 550 ℃ for 5 h via carbothermal reduction reaction,and the effects of various mass ratios of active carbon to fly ash（0.38,0.44 and 0.58） on the phase composition and microstructure of products were investigated,and the formation process of the powder was also analyzed in *** products mainly consist ofβ-SiC,α-Al_2O_3,Al_6Si_2O_（13） and *** carbon content favors the decomposition of Al_6Si_2O_（13） and formation of *** average particle size of β-SiC andα-Al_2O_3 is about 1 μm and that of Al_6Si_2O_（13） is 5-10μ*** formation process of SiC-Al_2O_3-Al_6Si_2O_（13）powder includes the decomposition of mullite in fly ash and formation of SiC.

关键词： mullite carbide alumina Reduction ceramics crystalline synthesizing disappear fabrication coated

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废旧高铝砖在LF精炼渣中的溶解行为研究

耐火材料 2024年第1期58卷 25-29页

作者：慕鑫贾毅刘春阳柴光伟余吴明杜传明马北越东北大学冶金学院辽宁沈阳110819 北京首钢股份有限公司河北唐山063009

LF精炼渣中Al_(2)O_(3)通常来源于铝矾土,其成分与废旧高铝砖相近,因此可用废旧高铝砖替代铝矾土作为LF精炼炉的造渣剂。将废旧高铝砖切割为∅17.3 mm×12.0 mm的试样与精炼渣分别在1600℃反应5、10、15和25 min,分析了废旧高铝砖试样在... 详细信息

LF精炼渣中Al_(2)O_(3)通常来源于铝矾土,其成分与废旧高铝砖相近,因此可用废旧高铝砖替代铝矾土作为LF精炼炉的造渣剂。将废旧高铝砖切割为∅17.3 mm×12.0 mm的试样与精炼渣分别在1600℃反应5、10、15和25 min,分析了废旧高铝砖试样在精炼渣中反应不同时间后的溶解率、显微形貌及溶解后精炼渣成分,探讨了废旧高铝砖在精炼渣中的溶解机制。结果表明:高铝砖溶解后与精炼渣存在明显的边界层,精炼渣中MgO会优先扩散至边界层与试样溶解的Al_(2)O_(3)形成Al_(2)O_(3)-MgO固溶体,随着反应时间的增加,Al_(2)O_(3)-MgO固溶体逐渐增多,反应后期在试样表面形成Al_(2)O_(3)-MgO固溶层,抑制了溶解产物铝酸钙相向精炼渣中扩散;反应25 min后,高铝砖试样溶解率达35%,且与反应5 min后的精炼渣相比,精炼渣中Al_(2)O_(3)含量(w)由27.1%提升至30.9%。

关键词：废旧耐火材料高铝砖 LF精炼渣溶解反应机制

ZrO_2-SiC复合材料的合成及其添加对Al_2O_3-C质耐火材料抗氧化性能的影响

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金属学报 2007年第10期43卷 1059-1064页

作者：马北越于景坤孙勇东北大学材料与冶金学院沈阳110004

以锆英石和碳黑为原料,利用碳热还原反应在氩气气氛下合成了ZrO_2-SiC复合材料,并将其添加到Al_2O_3-C质耐火材料中.研究了加热温度对ZrO_2-SiC复合材料合成的影响以及添加ZrO_2-SiC对耐火材料抗氧化性能的影响.采用XRD分析合成材料的... 详细信息

以锆英石和碳黑为原料,利用碳热还原反应在氩气气氛下合成了ZrO_2-SiC复合材料,并将其添加到Al_2O_3-C质耐火材料中.研究了加热温度对ZrO_2-SiC复合材料合成的影响以及添加ZrO_2-SiC对耐火材料抗氧化性能的影响.采用XRD分析合成材料的相组成,利用SEM观察材料的显微结构.研究表明,提高加热温度有利于ZrO_2-SiC复合材料的合成,在本实验条件下合成该材料的适宜温度为1873K.通过添加合成的复合材料,明显改善了Al_2O_3-C质耐火材料的抗氧化性能,且当添加6%(ZrO_2-SiC)复合材料时,耐火材料的抗氧化性能最佳.

关键词： ZrO2-SiC复合材料合成碳热还原 Al2O3-C质耐火材料抗氧化性