亚微米A12O3浆料的流变性优化研究

研究了多种高聚物类分散剂对亚微米氧化铝浆料流变性的影响,通过优化pH值、分散剂用量等因素,使颗粒间排斥力达到最大,获得了固含量高达58vol％的适合浇注的Al_2O_3浆料.以该浆料为原料,采用凝胶浇注的方法成型氧化铝陶瓷,获得了显微结构极其均匀的素坯,经1600℃烧结2h,烧结体的相对密度>98％.     

电解铝液生产铝材坯料的工艺技术

介绍了电解铝厂电解铝液的特性，分析了用电解铝液直接生产铝材坯料的工艺技术以及与铝锭重熔法相比的经济效益。     

Socially Learned Preferences for Differentially Rewarded Tokens in the Brown Capuchin Monkey (Cebus apella).

Social learning is assumed to underlie traditions, yet evidence indicating social learning in capuchin monkeys (Cebus apella), which exhibit traditions, is sparse. The authors tested capuchins for their ability to learn the value of novel tokens using a previously familiar token-exchange economy. Capuchins change their preferences in favor of a token worth a high-value food reward after watching a conspecific model exchange 2 differentially rewarded tokens, yet they fail to develop a similar preference after watching tokens paired with foods in the absence of a conspecific model. They also fail to learn that the value of familiar tokens has changed. Information about token value is available in all situations, but capuchins seem to pay more attention in a social situation involving novel tokens. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

稀土及其合金熔铸--水冷铜坩埚感应炉

本文简要介绍了由于采取了提高真空性能等有效措施，研制了型模加热和控温等装置以及离心铸造压力铸造等结构．成功地使水冷铜坩埚感应炉应用于稀土材料熔铸中并批量生产出性能优良的稀土材料。     

水环真空泵叶轮轮毂工艺改进

2BE1系列水环真空泵叶轮轮毂按德国西门子公司工艺是采用铸造生产的,其铸钢轮毂质量不稳定,生产周期长。为改变这一状况,我们在消化、吸收引进技术的基础上,结合生产实际情况,采用焊接的方法制造轮毂,取得了质量好、成本低、生产周期短的效果。     

小方坯连铸机实现二冷水动态控制之探讨

介绍了根据铸坯凝固传热学原理，建立二冷水动态控制模型的方法，根据石钢1^#,2^#小方坯连铸机二冷水控制现状，提出进一步改造实现二冷水动态控制的方法。     

钢-Al-20Sn复合板的非均匀扩散复合研究

提出了消除钢-Al-20Sn复合板复合界面脆化的非均匀扩散思想,并采用Al-20Sn半固态浆料与钢板进行铸轧复合,实现了非均匀扩散,改变了复合界面结构,消除了复合板复合界面的脆化。研究结果表明,在500℃钢板预热温度、10mm/s铸轧速度条件下,当半固态浆料固相率为34.3%时,复合界面由比例恰当的铁铝化合物和铁铝固溶体交替构成,脆化得以消除,相应的最大界面剪切强度为69.9MPa。     

Research on Optimum Operation and Structure of Tundish

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Solidification Simulation of Single Crystal Investment Castings

The three dimensional solidification simulation of the single crystal investment castings at withdrawal rates of 2 mm/min ,4.5 mm/min and 7 mm/min was performed with the finite element thermal analysis method.The calculated result were in accordance with the experimental ones.The results showed that with the increase of with-drawal rate the concave curvature of the liquidus isotherm was bigger and bigger and the temperature gradient of the castings decreased.No effects of withdrawal rate on the distribution of the temperature gradient of the starter and helical grain selector of the castings were observed at withdrawal rates of 2 mm/min ,4.5 mm/min and 7 mm/min.The relatively high temperature gradient between 500℃/cm and 100℃/cm in the starter and helical grain selector was obtained at three withdrawal rates.The study indicates the three dimensional solidification simulation by finite element method is a powerful tool for understanding solidification and predicting defects in single crystal investment castings.     

核防护运输容器铸铅工艺

核防护运输容器的主要辐射防护层是铸铅层。本文详细研讨了铸铅工艺，为了保证浇铸质量，针对不同组件进行不同工艺设计：外壳防护层采用底注式一次铸成、顺序凝固等方法，而底盘铅层则先铸后压，再机加工到尺寸。浇铸系统确保了工艺设计的实现。最后浇铸成的两组件，经放射性检测，完全符合性能要求。