LI Baomian
,
XU Guangming
,
CUI Jianzhong
钢铁研究学报(英文版)
The variation law of cladding thickness as well as the structures and properties of H90steel clad strip produced by inversion solidification was studied. The interface bonding mechanisms were approached. It is found that the thickness of H90 cladding goes sequentially through the solidification growth stage, holding stage, and remelting stage, with an increase in immersion time. The higher the preheating temperature of the steel coil, the thicker is the maximum cladding thickness. Observation by using optical microscopy (OM) and the electron probe microanalyzer (EPMA) shows that the microstructure of H90 cladding is composed of equiaxed grains, and that interdiffusion between Cu and Fe at interface occurs but obvious diffusion of Zn and the intermetallic layer are not observed. The diffusion layer is thin and about 4 μm. Multipass small reduction cold rolling and repeated bending tests show that the interface is firmly bonded. Tensile test shows that the mechanical properties of the asclad strips can meet the requirements of GB52132001 for the Fgrade deepdrawing steel plate though there is a slight difference in the mechanical properties among the clad strips with different cladding thickness.
关键词:
inversion solidification;clad coil;clad layer;interface;bond strength
祝贞学
,
戴起勋
,
李桂荣
,
王宏明
,
徐明喜
上海金属
doi:10.3969/j.issn.1001-7208.2005.05.005
以CaO-SiO2(22.4%)-Al2O3(11.6％)-CaF2(10％)精炼渣作为基础渣系,
添加BaO或Li2O,固定(CaO+BaO或Li2O)/SiO2=2.5,研究渣系熔点和粘度等熔体特性的变化.结果显示加入BaO、Li2O可以明显降低渣系的熔点和粘度,有效改善渣钢反应的动力学条件.当(BaO,Li2O)=15wt％时,熔渣的熔点分别为1267℃和1185℃,远低于作对比的基础渣的熔点1326℃,当温度为1475℃时,熔渣粘度分别为0.98Pa·s和0.51 Pa·s,远小于基础渣的粘度1.79Pa·s,使渣系具有良好的流动性,将显著提高炼钢精炼渣的精炼性能.
关键词:
CaO基熔渣
,
BaO
,
Li2O
,
熔点
,
粘度
汤李缨
,
高栋良
,
向光
材料导报
研究了BaO、Li2O含量变化对Na2O-CaO-SiO2玻璃热膨胀系数、玻璃化转变温度Tg以及化学稳定性的影响.结果表明:随着BaO替代等量CaO(2％～8％,摩尔分数),玻璃的热膨胀系数从81.78×10-7 K-1增加到86.09×10-7 K-1,Tg从536.9℃降低至525.4℃,化学稳定性变化不显著;随着Li2O替代等量Na2O(1％～4％,摩尔分数),玻璃的热膨胀系数先增加后减小,Tg由536.9℃降低到493.6℃,玻璃的耐碱性降低.
关键词:
Tg
,
热膨胀系数
,
化学稳定性
,
Li2O
,
BaO
郭上型
,
董元篪
,
陈二保
,
张友平
,
李桂荣
钢铁研究学报
在1 853 K温度下,用强碱性氧化物Li2O,Na2 O,K2O和BaO分别替代CaO-SiO2-Fe2O3-MnO2-MgO-P2O5系熔剂中的部分C aO,进行钢水回磷控制实验.结果表明,上述添加剂影响钢水脱磷效果的强弱顺序为:Li 2O＞Na2O＞K2O＞BaO.推荐Li2O作为CaO基实验熔剂的首选添加剂.确定钢水回磷控制用CaO基熔剂的优化组成为:W(CaO+Li2O)/WSiO2=2.5,W Li2O=15 %,W(Fe2O3+MnO2)≥2 %.当W(Fe2O3+MnO2 )=2 %时,采用上述组成的熔剂可获得48.1 %的脱磷率.向CaO基熔剂中添加10 %～30 %的 Li2O后,其磷酸盐容量lgCp为20.32±0.22,比未添加Li2O时CaO基熔剂的最大磷酸盐容量值增加了0.5～1.0个数量级.
关键词:
脱磷
,
CaO基熔剂
,
添加剂
,
磷酸盐容量
孙露
,
黄金亮
,
顾永军
,
李谦
硅酸盐通报
研究了BaCu(B_2O_5)(简写为BCB)掺入对14CaO-4BaO-8Li_2O-12Sm_2O_3-63TiO_2(简写为CBLST)微波介质陶瓷介电性能的影响.用XRD和SEM研究其相组成及微观形貌.结果表明:BaCu(B_2O_5)掺入能显著降低CBLST陶瓷的烧结温度,由1325 ℃降至1100 ℃.1100 ℃烧结2 h后,仍包含正交钙钛矿相和棒状的BST相.掺入6wt% BaCu(B_2O_5)的CBLST陶瓷取得了较好的介电性能:Kr=87.76,tanδ=0.018,TCF=-4.27 ppm/℃(1 MHz).
关键词:
微波介质陶瓷
,
钙钛矿
,
氧化物
,
液相烧结
,
介电性能
L.F. Li
,
Z.P. Chen
,
M.F. Jiang and W.Z. Wang(Department of Ferrous Metallurgy
,
School of Materials and Motallurgy
,
Northeastern University Shenyang 110006
,
China)(The Technology Center
,
Baoshan Iron & Steel Complex
,
Shanghai 201900
,
China)
金属学报(英文版)
The principle and steps for the calculation of component activities in fluxes using Schuhmann method are described. On the foris of Gibbs-Duhem equation and using Cr2O3 activities in BaO-BaF2-Cr2O3 system fiuxes, BaO activities at 1523 and 1673K are calculated, respectivelg,and the isoactivity diagrums of BaO are also obtained. The calculation results indicate that BaO activity increases with increasing its content in fiuxes, and decreaaes with the increase of Cr2O3 content at a given XBaO/XBaF2 ratio.
关键词:
Shuhmann method fluxes
,
null
,
null
王世俊
,
周云
,
章华兵
,
王海川
,
黄小东
钢铁研究学报
为了研究熔渣中BaO和TiO2含量对钢液氮含量的影响,选用CaO-SiO2-Al2O3系碱性渣作为基本成分,在此基础上添加BaO和TiO2,观察它们对钢液氮含量的影响.结果表明:在渣中添加BaO和TiO2可促进钢液脱氮,且钢液中氮含量随渣中BaO和TiO2含量的增加呈线性下降.
关键词:
钢液
,
氮含量
,
BaO
,
TiO2
王世俊
,
周云
,
章华兵
,
王海川
,
黄小东
钢铁研究学报
为了研究熔渣中BaO和TiO2含量对钢液氮含量的影响，选用CaOSiO2Al2O3系碱性渣作为基本成分，在此基础上添加BaO和TiO2，观察它们对钢液氮含量的影响。结果表明：在渣中添加BaO和TiO2可促进钢液脱氮，且钢液中氮含量随渣中BaO和TiO2含量的增加呈线性下降。
关键词:
钢液;氮含量;BaO;TiO2
胡英杰
,
程继健
硅酸盐通报
doi:10.3969/j.issn.1001-1625.1999.02.012
采用Sol-gel方法制备出新型SiO2-TiO2-BaO-CaO耐碱涂层.合成了适合于浸涂工艺的稳定溶胶涂液.红外光谱表明:醋酸与钛离子形成稳定的配位体,从而延长了凝胶时间;500℃处理后,凝胶中已形成氧化物网络.通过测定侵蚀后涂膜玻璃的失重量和原子吸收光谱,分析组成和热处理温度对涂层耐碱性的影响.XRD图谱和SEM照片表明:涂膜玻片经NaOH侵蚀后,表面形成富钛保护层,提高耐碱性,而侵蚀后生成的复杂晶体使侵蚀加剧.
关键词:
sol-gel工艺
,
SiO2-TiO2-BaO-CaO系统
,
浸渍涂层
,
耐碱性
,
防护膜
马先伟
,
贺孝一
,
傅蓉
,
陈胡星
,
沈锦林
材料科学与工程学报
doi:10.3969/j.issn.1673-2812.2006.04.027
针对高C3S熟料矿物体系,研究了BaO对相应的高钙生料易烧性的影响,并通过XRD、SEM研究了熟料矿物的结晶状况.结果表明:在较低烧成温度下(≤1350℃),掺入适量BaO后,能较明显地改善生料的易烧性,对矿物结晶影响不明显;但是在较高烧成温度下(＞1350℃),掺入BaO对改善生料的易烧性不利,C3S结晶程度下降,晶体尺寸均匀性降低.另外还对BaO影响高钙生料易烧性的机制进行了探讨.
关键词:
BaO
,
高C3S熟料
,
易烧性
