材料期刊网

Effects of Al on Microstructure and High-Temperature Wear Properties of Austenitic Heat-Resistant Steel

ZHANG Yan , SUN Yu-fu , ZHAO Jing-yu , GUAN Shao-kang

钢铁研究学报(英文版)

Microstructure and high-temperature dry sliding wear at 600 ℃ in ambient air of austenitic heat-resistant steel ZG40Cr25Ni20 with different contents (mass percent) of Al (0 to 710%) have been investigated. The results show that microstructures of 468% and 710% Al addition content consist of the matrix and reinforcement of intermetallic compound γ′ and carbide, while microstructures of ZG40Cr25Ni20 without Al and with Al of 168% are absent of γ′. Higher wear resistance than the original ZG40Cr25Ni20 alloy is achieved in alloys with higher content of Al under the same high-temperature wear test condition. The wear rates of Fe-25Cr-20Ni-710Al and Fe-25Cr-20Ni-468Al are only 2083% and 4583% of that of Fe-25Cr-20Ni, respectively. Heat-resistant steels with higher contents of Al (472% and 710%) have higher hardness than those with lower contents of Al (168% and 0). Wear mechanisms of ZG40Cr25Ni20 are considered as severe plough plastic deformation and slight adhesive. However, wear mechanisms of Fe-25Cr-20Ni-468Al are light micro-cutting and oxidation-wear, while that of Fe-25Cr-20Ni-710Al are severe adhesive transfer and oxidation-wear.

关键词: austenitic heat-resistant steel , Al , microstructure , high-temperature sliding wear , mechanism

FU105大功率广播发射管用碳化镧钼阴极研究

万小峰 , 张久兴 , 周文元 , 李湘波 , 周美玲

稀有金属材料与工程

研究了FU105大功率广播发射管用碳化镧钼阴极,参照碳化钍钨阴极FU105管的制备工艺,实现了镧钼阴极的碳化以及镧钼阴极FU105管的排气和老炼.通过镧钼阴极FU105管的性能测试,对碳化镧钼阴极的发射能力和稳定性进行了分析.结果认为:FU105管碳化镧钼阴极的发射能力可以达到碳化钍钨阴极的水平,但其稳定性还有待改进.

关键词: 镧钼阴极 , FU105发射管 , 碳化 , 稀土

[Pt(en)(5-Fu)2]Cl2配合物的合成及抗肿瘤活性

钟文远 , 崔永春 , 范春兰 , 胡智兴 , 李玛琳

贵金属 doi:10.3969/j.issn.1004-0676.2004.02.005

为寻求高效低毒的新型顺铂类抗肿瘤药物,用K2PtCl4、乙二胺(en)、氟尿嘧啶(5-Fu)为原料,设计合成了顺铂类似物[pt(en)(5-Fu)2]C12配合物,由元素分析、红外光谱和质谱分析初步证实了其化学结构,用改良MTT、SRB法,选用K562、A549、Bel-7402、BIU-87、Bcap-37细胞株对其进行体外抗肿瘤活性测定.结果表明,所合成的配合物除在浓度为0.01、0.1 μg/mL时对K562细胞株抗肿瘤活性大于顺铂和氟尿嘧啶外,其它情况下的抗肿瘤活性均小于顺铂和氟尿嘧啶.该配合物仍有进一步研究的价值.

关键词: 药学 , 铂(Ⅱ)配合物 , 合成 , 抗肿瘤活性

钛等金属的SUN-Z-R复合技术

吴全兴

钛工业进展 doi:10.3969/j.issn.1009-9964.2001.02.008

关键词:

Professor XU Zhong-yu and his research activities

新型炭材料

关键词:

Preface to Special Issue on Photocatalysis for celebrating the 20th anniversary of Professor Jimmy C. Yu’s return to Hong Kong and leading photocatalytic research there

催化学报 doi:10.1016/S1872-2067(15)61006-3

关键词:

聚天冬氨酸交联温敏性水凝胶的药物缓释性能

于跃芹 , 常宪智 , 田红杰 , 许洋

高分子材料科学与工程

选用牛血清蛋白(BSA)和5-氟尿嘧啶(5-FU)为模型药物,以聚天冬氨酸交联温敏性水凝胶为载体材料,采用包埋法制备了载药水凝胶,研究了水凝胶的载药和释药性能.水凝胶对BSA和5-FU的包埋率均大于98%.37℃时,水凝胶中丙烯酸用量越大,BSA的释放率越低;交联剂用量对BSA的释放率无显著影响.25℃时,丙烯酸用量越大,5-FU的释放率越大;交联剂用量越大,5-FU的释放率越小.37℃时,丙烯酸用量越小,5-FU的释放率越大;交联剂用量越大,5-FU的释放率越小.

关键词: 温敏性水凝胶 , 药物缓释 , 5-氟尿嘧啶 , 牛血清蛋白

磁性壳聚糖-5-氟尿嘧啶纳米粒的制备及体外释药性能

李和平 , 肖华伍 , 肖子丹 , 阮建明

高分子材料科学与工程

采用交联-聚合法在超声波的作用下,制备了磁性壳聚糖-5-氟尿嘧啶纳米粒(MCN-Fu).透射电子显微镜(TEM) 和红外光谱(IR)等分析结果表明,MCN-Fu粒子外形规整,分散性好,粒径主要在50 nm～60 nm 之间.紫外-可见光谱分析结果表明,MCN-Fu的载药量为21.3%,在磷酸盐缓冲溶液(pH=7.2)中,30 h的累积释药率为67.6%,具有良好缓释性能,并具有良好磁响应性能.

关键词: 磁性 , 壳聚糖 , 氟尿嘧啶 , 纳米粒 , 药物缓释剂

CFRP双剪单钉连接接头强度分析

崔海涛 , 温卫东

宇航材料工艺 doi:10.3969/j.issn.1007-2330.2004.04.011

双剪连接接头是复合材料结构连接设计的主要环节.针对T300/KH304复合材料层合板的双剪连接形式,分析了单钉连接情况下的接头强度,并采用Yamada-Sun准则预测了该层合板结构双剪连接接头的破坏载荷.结果表明:该接头的破坏模式主要呈现为挤压破坏;Yamada-Sun准则可以较好地预测该结构的破坏载荷;所预测的接头的破坏载荷及破坏模式,试验结果与数值分析结果比较一致.

关键词: 复合材料层合板 , 双剪连接接头 , 强度分析 , 有限元法

Improved Nonlinear Equation Method for Numerical Prediction of Jominy EndQuench Curves

SONG Yuepeng , LIU Guoquan , LIU Shengxin , LIU Jiantao , FENG Chengming

钢铁研究学报(英文版)

Without considering the effects of alloying interaction on the Jominy endquench curves, the prediction results obtained by YU Baihai′s nonlinear equation method for multialloying steels were different from those experimental ones reported in literature. Some alloying elements have marked influence on Jominy endquench curves of steels. An improved mathematical model for simulating the Jominy endquench curves is proposed by introducing a parameter named alloying interactions equivalent (Le). With the improved model, the Jominy endquench curves of steels so obtained agree very well with the experimental ones.

关键词: Jominy endquench curve;nonlinear equation method;alloying interaction parameter;computer simulation