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FRACTURE BEHAVIOUR OF SiC WHISKER REINFORCED Al COMPOSITES

CAO Li JIANG Chiping YAO Zhongkai LEI Tingquan Harbin Institute of Technology , Harbin , China

金属学报(英文版)

The dynamic tensile processes of silicon carbide whisker reinforced Al composite(SiC_w/Al) with 22% V_f have been in situ observed with a scanning electron microscope equipped with a tensile stand.The results show that a number of microcracks have formed as the tensile stress increases to 180~190 MPa.Microcracks form in most cases at the whisker ends.The frac- ture behaviour of SiC_w/Al composite observed has been explained theoretically.

关键词: composite , null , null , null , null

Li2O对CaO基钢包渣系脱磷能力影响的热力学研究

王宏明 , 李桂荣

上海金属 doi:10.3969/j.issn.1001-7208.2002.06.003

渣金平衡实验表明Li2O替代CaO基钢包渣系中等量CaO使渣系磷酸盐容量Cp提高.在此基础上进行钢液脱磷的工艺性实验,研究了Li2O含量、渣系碱度及氧化性对渣系脱磷能力的影响,并给出了控制转炉钢液在钢包中回磷及钢包渣脱磷的渣系.

关键词: CaO基渣系 , Li2O脱磷渣 , 脱磷 , 热力学

添加BaO和Li2O对CaO基脱硫精炼渣熔点和粘度的影响

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

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

CaO基熔剂中添加Li2O,Na2O,K2O和BaO对钢水回磷控制效果的影响

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

添加Li_2O的CaO-B_2O_3-SiO_2系微晶玻璃的性能研究

宁革 , 刘敏 , 周洪庆 , 朱海奎 , 许贵军

硅酸盐通报

Li_2O为烧结助剂,采用DTA、XRD、SEM等分析手段研究了添加1.0~2.5 wt%Li_2O对CaO-B_2O_3-SiO_2(CBS)系微晶玻璃性能的影响.结果表明:Li_2O降低了CBS系微晶玻璃的玻璃转变温度和析晶温度.未添加Li_2O的试样在930 ℃烧结,而添加Li_2O的试样可以在820 ℃以下烧结,Li_2O显著降低了试样的烧结温度.当Li_2O添加量为1.0wt%时,试样可以在760~820 ℃范围内烧结,800 ℃烧结试样介电常数为5.71,介电损耗为0.0024(测试频率为10 MHz).

关键词: 烧结助剂 , LTCC , CBS系微晶玻璃 , 介电性能

Li2O-Na2O-K2O-CaO-MgO-Al2O3-SiO2系统乳浊釉的研究

滕元成

硅酸盐通报 doi:10.3969/j.issn.1001-1625.2002.06.002

Li2O-Na2O-K2O-CaO-MgO-Al2O3-SiO2系统釉进行了较全面的正交试验研究,找到了影响该系统釉乳浊及釉面质量的主次因素,获得了性能良好的乳浊釉及其较优乳浊釉配方.

关键词: Li2O , 正交试验 , 乳浊釉

BaCu(B_2O_5)助烧对CaO-BaO-Li_2O-Sm_2O_3-TiO_2

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

Microstructures and Dielectric Properties of Ba1-xSrxTiO3 Ceramics Doped with B2O3-Li2O Glasses for LTCC Technology Applications

Xiujian Chou

材料科学技术(英文)

Ba1-xSrxTiO3 ceramics, doped with B2O3-Li2O glasses have been fabricated via a traditional ceramic process at a low sintering temperature of 900 °C using liquid-phase sintering aids. The microstructures and dielectric properties of B2O3-Li2O glasses doped Ba1-xSrxTiO3 ceramics have been investigated systematically. The temperature dependence dielectric constant and loss reveals that B2O3-Li2O glasses doped Ba1-xSrxTiO3 ceramics have diffusion phase transformation characteristics. For 5 wt% B2O3-Li2O glasses doped Ba0:55Sr0:45TiO3 composites, the tunability is 15.4% under a dcpplied electric field of 30 kV/cm at 10 kHz; the dielectric loss can be controlled about 0.0025; and the Q value is 286. These composite ceramics sintered at low temperature with suitable dielectric constant, low dielectric loss, relatively high tunability and high Q value are promising candidates for multilayer low-temperature co-fired ceramics (LTCC) and potential microwave tunable devices applications.

关键词: Sintering

Titanium technology in the USA - an overview

D.Eylon , S.R.Seagle

材料科学技术(英文)

The state of Ti research, development and industry is reviewed in this article. The fifty-year anniversary of Ti technology commercialization in the USA provides an opportunity for a historical perspective. Incorporation of "information-age" tools into alloy development, processing, and production invigorates the technology. Consolidation, diversification and globalization have been transforming the Ti industry in the recent years.

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