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China's Refractories 2024年第1期33卷 1-6页

作者： Valeriy V.MARTYNENKO Iryna G.SHULYK Yuliya Ye.MISHNYOVA Tetyana G.TYSHYNA The Ukrainian Research Institute of Refractories named after A.S.Berezhnoy Kharkiv 61024Ukraine

The microstructure and phase composition of high-alumina,chromic oxide,and AZS/Cr refractories containing 30%and 60%(by mass)Cr_(2)O_(3) after exposure to aluminaboronsilicate glasses and basalt melts depending on the type of melts and temperature have been *** mechanisms of refractory corrosion by the used melts and the factors contributing to the inhibition of corrosion development have been investigated by the method of petrographic *** the basis of obtained results,the use of high-alumina,chromic oxide,and AZS/Cr refractories in the sections of glass furnace linings,experiencing the intensive impact of aluminaboronsilicate glasses and basalt melts,has been confirmed and scientifically substantiated.

关键词： high-alumina refractories chromic oxide refractories AZS/Cr refractories microstructure phase composition aluminaboronsilicate glasses melts basalt melt

Fine structure and phase composition of Fe–14Mn–1.2C steel:influence of a modified mixture based on refractory metals

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International Journal of Minerals,Metallurgy and Materials 2017年第5期24卷 523-529页

作者： Anna Zykova Natalya Popova Mark Kalashnikov Irina Kurzina Tomsk Polytechnic University Tomsk State University of Architecture and Building Chemical Department Tomsk State University

The effect of TiO;,ZrO;and Na;AlF;ultrafine powders on the fine structure and the phase composition of Fe–14Mn–1.2C steel was *** introduction of the ultrafine powders into the melt influenced the grain size,the quantity,and the character of distribution of nonmetallic inclusions in the railroad *** microstructure of castings was improved significantly because of the refinement of the grain structure and an increase of the grain-boundary *** the modifying mixture was introduced into the melt,either the microtwins of one or two intersecting systems or the precipitations of ε-martensite of different types,or simultaneously the microtwins and wafers of ε-martensite,were present in each grain.

关键词： manganese steel fine structure phase composition refractory metals

Effect of erbium doping on phase composition, mechanical and thermal properties of ZrO_(2)-based ceramics

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Journal of Rare Earths 2022年第10期40卷 1628-1634页

作者： Zheng Cao Shengli An Xiwen Song School of Metallurgy and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices Inner Mongolia University of Science and TechnologyBaotou O14010China School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China

Er_(x)Ti_(0.1)Zr_(0.9-x)O_(2-1.5 x)(x=0.04,0.05,0.06,0.07,0.08) ceramics were synthesized by a solid-state reaction *** influence of the Er^(3+) addition on the phase composition,Vickers hardness,fracture toughness,and thermal conductivity of this ceramic material was *** X-ray diffraction results reveal that the c-ZrO_(2) content increases from 1.85 vol% to 33.89 vol%,and the percentage of t-ZrO_(2) decreases from 98.15 vol% to 66.11 vol% with the increase in Er^(3+) content from 4 mol% to 8 mol%.Moreover,the addition of Er^(3+) is beneficial to the volume expansion of the unit *** the same time,the incorporation of Er^(3+) weakens the coordination of oxygen ions around the metal cations,resulting in a corresponding decrease in the tetragonality of the t-ZrO_(2).The Vickers hardness and fracture toughness of the Er_(x)Ti_(0.1)Zr_(0.9-x)O_(2-1.5)_(x) ceramics show increasing and decreasing trends,*** thermal conductivity has a significant decline due to point defects caused by the Er^(3+) *** 8 ETZ ceramic exhibits the highest Vickers hardness(12.7 GPa),the lowest fracture toughness(7.6 MPa·m^(1/2)),and the lowest average thermal conductivity(1.85 W/(m·K)) in the temperature range of 200-1000℃.All of the above properties are higher than those of the Y_(2)O_(3)-stabilized ZrO_(2) ceramic.

关键词： Er_(2)O_(3) phase composition Vickers hardness Fracture toughness Thermal conductivity Rare earths

Effect of chemical composition on the element distribution,phase composition and calcification roasting process of vanadium slag

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2144-2151页

作者： Tangxia Yu Tao Jiang Jing Wen Hongyan Sun Ming Li Yi Peng State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000China School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education Northeastern UniversityShenyang 110819China Liaoning Key Laboratory for Metallurgical Sensor and Technology Shenyang 110819China

The chemical composition of vanadium slag significantly affects its element distribution and phase composition,which affect the subsequent calcification roasting process and vanadium *** this work,seven kinds of vanadium slags derived from different regions in China were used as the raw materials to study the effects of different components on the vanadium slag’s elements distribution,phase composition,calcification roasting,and leaching rate of major elements using scanning electron microscope,X-ray diffraction analysis,and inductively coupled plasma-optical emission *** results show that the spinel phase is wrapped with silicate phase in all vanadium slag *** main elements in the spinel phase are Cr,V,and Ti from the interior to the *** size of spinel phase in low chromium vanadium slag is larger than the other vanadium slags with higher chromium *** spinel phase of high-calcium and high-phosphorus vanadium slag is more *** strongest diffraction peak of vanadium spinel phase in the vanadium slag migrates to a higher diffraction angle,and(Fe_(0.6)Cr_(0.4))_(2)O_(3)is formed after calcification roasting as the chromium content increased.A large amount of Ca_(2)SiO_(4)is produced because excess Ca reacts with Si in high-calcium and high-phosphorus vanadium *** vanadium leaching rate reaches 88%in some vanadium *** chromium leaching rate is less than 5%in all vanadium *** silicon leaching rate of high-calcium and high-phosphorus vanadium slag is much higher than that of the other *** leaching rate of manganese is higher than 10%,and the leaching rates of iron and titanium are negligible.

关键词： vanadium slag calcification roasting element distribution phase composition leaching rate

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

Growth Rate,Microstructure and phase composition of Oxide Scales for Three Typical Steels in Simulated Continuous Casting Process

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Journal of Iron and Steel Research International 2014年第12期21卷 1065-1072页

作者： Nan WANG Jian-hong DONG Wei-jun HUANG Bo LI Min CHEN School of Materials and Metallurgy Northeastern University

C-rowth rate, microstructure and phase composition of scale layer formed during oxidation in 56 % H2O9%O2 N2 and following continuous cooling in ambient air were experimentally investigated by means of optical microscopy, scanning electron microscopy （SEM）, energy-dispersive spectroscopy （EDS） and X-ray diffraction （XRD） for 45, 20CrMnTi and TTS443M steels respectively, to examine the effects of strand surface temperature and steel composition on the scale formation in simulated continudus casting process. The growth rates were found to be ap proximately parabolic and the calculated activation energy of TTS443M steel is much higher than those of the two other steels. For 45 and 20CrMnTi steels, the scale layers were looser and a distinct gap formed at the scale-sub strate interface at higher strand surface temperature. The dominant phases within the scale were iron oxides except for FeO · Cr2O3 phase simuhaneously existing in the oxide scale of 20CrMnTi steel. On the other hand, the scale layer formed on TTS443M steel was compact and tightly attached to the steel surface. At both lower and higher strand surface temperature, iron oxide was main phase in external layer of the scale, while chromia was dominant in inner layer with an appreciable Cr enrichment.

关键词： oxide scale growth rate microstructure phase composition continuous casting

Evolution of phase composition and Microstructure of Al_2O_3-Si-Al Composite at High Temperatures in Reducing Atmosphere

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China's Refractories 2014年第4期23卷 32-35页

作者： LIU Xinhong YE Fangbao ZHONG Xiangchong High Temperature Ceramics Institute Zhengzhou University

Al2 O3-Si-Al composite specimens with the size of 25 mm × 25 mm × 125 mm were prepared using fused alumina （as aggregates and fines）,ultra-fine α-Al2O3,Si and Al powders as starting materials,liquid phenol formaldehyde resin as the binder,pressing and heating at 800-1 500 ℃ for 3 h under carbon embedded *** of phase composition and microstructure of Al2 O3-Si-Al composite during heating from 800 to 1 500 ℃ under carbon embedded condition were *** results show that：（1） Al4 C3,AlN and SiC are initially formed at 800-900 ℃ due to reactions of Al and Si with C or CO and N2 ; （2） at 1 000-1 300 ℃,the amounts of Al4C3,AlN and SiC increase with temperature rising and their crystals grow; （3） at 1 400-1 500 ℃,Al4 C3 and AlN disappear,and minor SiAlON crystals are observed; the nonoxide crystals develop well and they are interlaced in the corundum skeleton structure,which creates strengthening and toughening

关键词： alumina-silicon-aluminum composite phase composition microstructure reducing atmosphere

Evolution of microstructure, phase composition, and tensile properties of severely cold deformed titanium metastable β alloy in rapid continuous heating

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Transactions of Nonferrous Metals Society of China 2014年第5期24卷 1365-1371页

作者： P.E.MARKOVSKY V.I.BONDARCHUK YU.V.MATVIYCHUK O.P.KARASEVSKA G.V.Kurdyumov Institute for Metal Physics National Academy of Sciences of Ukraine

Influence of severe cold deformation of titanium alloy Ti-1.5%A1-6.8%Mo-4.5%Fe in metastable β condition on the evolution of phase composition, microstructure, and tensile properties during continuous rapid heating was studied. As-deformed alloy was characterized by quasi-amorphous single-phase β condition with an abnormal temperature dependence of electric resistance that was normalized after 48 h exposure at room temperature as a result of isothermal ω phase precipitation. Subsequent rapid heating with a rate of 5 ℃/s caused recovery and recrystallization. Tensile properties of the alloy after different treatments were determined and discussed.

关键词： titanium alloy severe cold deformation rapid heating recovery and recrystallization phase composition microstructure mechanical properties

Microstructure and phase composition of as-cast Mg-9Er-6Y-xZn-0.6Zr alloys

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Transactions of Nonferrous Metals Society of China 2013年第4期23卷 889-895页

作者：王敬丰宋鹏飞潘复生周小蒽重庆大学材料科学与工程学院重庆400044 重庆大学国家镁合金材料工程技术研究中心重庆400044

The microstructure and phase composition of as-cast Mg-9Er-6Y-xZn-0.6Zr （x=1, 2, 3, 4; normal mass fraction in %） alloys were investigated. In low Zn content, aside from the major second phase of Mg24（Er, Y, Zn）5, there are a few lamellar phases that grow parallel with each other from the grain boundaries to the grain interior. With Zn content increasing, the Mg24（Er, Y, Zn）5 phase decreases, but the Mg12Zn（Y, Er） phase and lamellar phases continuously increase. When Zn content reaches 4% （normal mass fraction）, the Mg12Zn（Y, Er） phase mainly exists as large bulks, and some a-Mg grains are thoroughly penetrated by the lamellar phases. Moreover, the crystallography structures of the Mgl2Zn（Y, Er） and Mg24（Er, Y, Zn）5 phases are confirmed as 18R-type long-period stacking ordered structure and body-centred cubic structure, respectively.

关键词： magnesium alloys microstructure phase composition long-period stacking ordered (LPSO) structure phase

EFFECT OF PROMOTERS(La,K,V,Zn) ON THE phase composition OF COPRECIPITATED Fe-Mn CATALYST

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Journal of Energy Chemistry 1995年第1期 86-90页

作者： YAN Shi-Run ZHOU Jing-Lai LIN Heng-ShengInstitute of Coal Chemistry,Academia Sinica Taiyuan,Shanxi 030001

By using Mossbauer Effect Spectroscopy ( MES ), effects of promoters (La, K, V, Zn ) on the phase composition of coprecipitated iron-manganese (Fe- Mn ) catalyst after calcination, reduction and FT synthesis have been... 详细信息

关键词： promoter effect phase composition Fe-Mn catalyst