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Component Evaporation of Ti-15-3 Melt during ISM Processing

Yanqing SU , Jingjie GUO , HongSheng DING , Songqing LIU , Yuan LIU , GuiZhong LIU , Jun JIA

材料科学技术（英文）

How to control melt composition is the key for getting high quality alloy melt. The paper made the following efforts: (1) The activity coefficients in Ti-15-3 melt have been calculated. (2) Taking advantage of the activity coefficients, the evaporation losses of components in Ti-15-3 melt during ISM process have been studied. The calculated results show that there is a critical vacuum degree (about 1.33 Pa) during melting process.

关键词:

Novel Reduced-friction Materials by Laser Cladding of Copper Alloy on Cast Iron

Xichen YANG Milin ZHONG Tianxi ZHENG Naikun ZHANG Laser Processing Lab. , Tianjin Institute of Textile Science and Technology , Tianjin , 300160 , China

材料科学技术（英文）

Copper alloys suitable for laser cladding on cast iron are selected trom rune types of conventional powders. There are a poor spreading ability and porosity of copper alloy over the surface of castiron. Copper alloy surface is easily oxidized in atmosphere. These shortages have been overcome by ad- ding deoxidizers of Si and H_3BO_3. Laser parameters, stress and coefficient of friction have been ex- amined, and the larger smooth surface of Cu/cast iron for friction by laser cladding has been made for the application of the guide shoes of machine.

关键词: laser cladding , null , null

环氧树脂中电树枝生长特性及其动力学模型的实验验证

杨文虎 , 易冉 , 徐阳 , 惠思思 , 曹晓珑

绝缘材料 doi:10.3969/j.issn.1009-9239.2012.01.014

研究了不同外施工频电压下环氧树脂绝缘中的电树枝结构、生长的特性,并用Ding等提出的模型解释了电树枝的发展过程,模拟了其生长曲线.结果表明:在同一电压下,环氧树脂中电树枝的生长速度基本为恒定值,随外施电压的升高,电树枝分枝变少,生长速度基本呈指数增加,且利用模型模拟的生长曲线与实验测试的结果吻合,最后讨论了模型的物理基础.

关键词: 电树枝 , 环氧树脂 , 劣化 , 动力学 , 模型 , 模拟

Miedema模型在含O和S熔体与合金中的扩展与应用

陈伟亮 , 张宁 , 唐昭辉 , 丁学勇

材料研究学报

将Miedema模型与实验数据相结合得到适于Miedema模型的O和S的参数(O:电负性7.04、电子密度6.03、摩尔体积4.59;S:电负性5.8、电子密度3.24、摩尔体积6.97),计算了141种O的二元化合物和145种S的二元化合物生成焓其平均绝对误差(MAPE)分别为36.8％、32.4％.结合Ding导出的三元系相互作用系数计算模型,计算了1873 K时Fe基熔体中O和S与其它元素之间的相互作用系数.与实验数据的比较表明,除个别元素外,计算值与实验值之间误差不大且变化趋势比较一致.将误差较大的Nb、Ag、Pt的电负性参数由原来的4.05、4.35、5.65修正为4.31、4.17、5.57,使用Miedema模型的计算精度有很大的提高.

关键词: 材料科学基础学科 , Miedema模型 , 含O和S熔体与合金 , 相互作用系数 , 参数的修正

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