以Ba云母为主晶相的可切削玻璃陶瓷

基于Ｂａ０．５Ｍｇ３（Ｓｉ３ＡｌＯ１０）Ｆ２－Ｍｇ２Ａ１４Ｓｉ５Ｏ１８－Ｃａ３（ＰＯ４）２系统，制备出了以含Ｂａ碱士云母为主晶相的可切削玻璃陶瓷，弯曲强度σｂ＝２２９ＭＰａ，断裂韧性Ｋｌｃ＝２．４８ＭＰ·ｍ１／２；钻孔速度大于７ｍｍ／ｍｉｎ．优良性能的获得借助于Ｂａ云母玻璃陶瓷可控的显微组织，即相互交错的云母体和“卷心菜”的组织特征．观察到了两类类型的断口形貌：云母晶体层内断的层状花样和沿（００１）晶面层间断的小刻面花样．     

以玻璃片为基底制备氧化锌纳米棒

以Zn(NO3)2和C6H12N4为原料,在玻璃基片上用均匀沉淀法合成ZnO纳米棒.采用正交实验考察了反应溶液浓度、反应时间、反应温度对产品结构的影响,通过扫描电子显微镜(SEM)、X射线衍射(XRD)对产品进行表征,研究了不同制备条件下产品的形貌变化,探讨了Zn纳米棒的生长机制,确定了最佳工艺参数.研究结果表明,反应溶液浓度0.01mol/L、温度90℃、反应时间3h为最佳反应条件,得到尺度均匀的ZnO纳米棒,最小直径为80nm左右,推测ZnO纳米棒的生长机制为SLS型.     

钛酸盐玻璃形成的动力学研究

根据玻璃形成的动力学理论,分析了高 TiO_2含量的钛酸盐玻璃的形成情况。用玻璃的粘度、差热分析等实验数据,计算了不同 TiO_2含量玻璃的 Hruby 值(K_(?))、成核速率(I_v)、晶化活化能(E_c)和临界冷却速率(R_(?))。结果表明,随玻璃组份中 TiO_2含量的增加、B_2O_3量的减少,玻璃的临界冷却速率值增大,玻璃形成趋于困难。含50mol% TiO_2玻璃的 R_c 值约为10~3K/s。     

Reversibility of Polyester Adsorption on Glass

The adsorption of poly(ethylene o-phthalate) from chloroform solution on glass powder and aluminum oxide was studied. The adsorption of a number of fractions, varying in number average molecular weight from 970 to 6250 showed a decrease in the moles of polymer adsorbed with increase in molecular weight. The results are interpreted to indicate that this polymer molecule lies in a relatively flattened conformation on the glass surface. More polymer was adsorbed on glass powder at 50 °C than at 0 °C. Adsorption on glass powder that had been outgassed to remove adsorbed water was less than on untreated glass. Initial adsorption at one temperature followed by exposure at the other temperature resulted in complete reversibility of sorption on the untreated glass. Decreasing the temperature from 50 to 0 °C resulted in desorption from the outgassed glass, but increasing the temperature did not result in additional adsorption. These differences are ascribed in part to adsorption across an adsorbed water layer on the untreated glass. An explanation for the “one-direction reversibility” observed for the outgassed glass is presented.     

玻璃纤维/玻璃微珠混杂增强聚氨酯泡沫铝压缩性能研究

通过实验制备了泡沫铝、聚氨酯泡沫铝(PUF泡沫铝)和增强PUF泡沫铝试件,并对它们的压缩性能进行了研究.结果表明,增强PUF泡沫铝尤其是混杂增强PUF泡沫铝的压缩性能优于纯泡沫铝和PUF泡沫铝,且当玻璃纤维含量为4.5％(质量分数)、玻璃微珠含量为1.5％(质量分数)时,混杂增强PUF泡沫铝复合材料的增强效果最好,可作为一种缓冲性能很好的防护材料.     

Strength of reed from Egypt

A growing need for building materials and an increasing demand for the analytical calculation of structures mean that data are required about materials which were traditionally used on an empirical basis. This is true for Egyptian reed, and tests are reported on its uniaxial tensile and compressive strength, and its static and impact bending strength.     

Effect of Seawater and Warm Environment on Glass/Epoxy and Glass/Polyurethane Composites

A study of the durability of fiber reinforced polymer (FRP) materials in seawater and warm environment is presented in this paper. The major objective of the study is to evaluate the effects of seawater and temperature on the structural properties of glass/epoxy and glass/polyurethane composite materials. These effects were studied in terms of seawater absorption, permeation of salt and contaminants, chemical and physical bonds at the interface, degradation in mechanical properties, and failure mechanisms. Test parameters included immersion time, ranging from 3 months to 1 year, and temperature including room temperature and 65°C. Seawater absorption increased with immersion time and with temperature. The matrix in both composites was efficient in protecting the fibers from corrosive elements in seawater; however moisture creates a dual mechanism of stress relaxation—swelling—mechanical adhesion, and breakdown of chemical bonds between fiber and matrix at the interface. It is observed that high temperature accelerates the degradation mechanism in the glass/polyurethane composite. No significant changes were observed in tensile strength of glass/epoxy and in the modulus of both glass/epoxy and glass/polyurethane composites. However, the tensile strength of the glass/polyurethane composite decreased by 19% after 1 year of exposure to seawater at room temperature and by 31% after 1 year of exposure at 65°C. Plasticization due to moisture absorption leads to ductile failure in the matrix, but this can be reversed in glass/polyurethane composites after extended exposure to seawater at high temperature where brittle failure of matrix and fiber were observed.     

玻璃组成对含银光色玻璃光色性质影响原因的研究

本文通过对光色玻璃变色过程的分析，利用分相，固溶体，能带理论的观点，合理解释了某些组成对光色性质影响的原因，并给出了它们影响程度的相对大小。     

用电子探针分析含铅水晶玻璃中的结石

玻璃结石是玻璃的一种严重缺陷,不仅影响玻璃制品的外观,而且还会降低玻璃制品的使用价值,若不及时根除会带来极大的经济损失;分析结石的种类、查找结石产生的根源,是消除这种缺陷的关键。利用电子探针分别对含铅水晶玻璃中宏观形态不同的三种玻璃结石进行了背散射电子形貌及化学成分定性和定量分析。结果表明:同以前常用的光学显微镜方法相比,电子探针可以对结石的主要成分进行快速分析,有助于准确推测出结石产生的可能原因,为有效提高玻璃制品的正品率提供了依据。     

高强玻璃纤维复合材料的铣削加工性能研究

由于复合材料具有各向异性,在加工过程中产生的分层破坏严重影响其装配质量、降低其结合强度,因此需要对复合材料加工过程中的分层情况进行研究.从手糊成型层叠厚板高强玻璃纤维增强复合材料的铣削加工入手,通过单因素法改变切削参数测试作用在试件上的切削力和扭矩的大小来考察加工表面的分层破坏情况.利用正交回归原理建立了切削力、扭矩和分层因子的经验公式,预测了切削力、扭矩和分层因子随切削参数变化的趋势.     

玻璃基体上电沉积Ni-Co合金镀层的性能研究

对玻璃基体上电沉积Ni Co合金镀层的工艺及镀层的性能进行了研究 ,对底镀层的形貌、成分、结构进行了观察和分析 ,并测定了镀层的耐腐蚀性。结果表明 ,镀层在 0 .5mol/LH2 SO4 和 5%NaCl(pH =3 )中的耐蚀性与 1Cr18Ni9Ti相当     

Thin Helium Film on a Glass Substrate

We investigate by Monte Carlo simulations the structure, energetics and superfluid properties of thin ⁴He films (up to four layers) on a glass substrate, at low temperature. The first adsorbed layer is found to be solid and “inert”, i.e., atoms are localized and do not participate to quantum exchanges. Additional layers are liquid, with no clear layer separation above the second one. It is found that a single ³He impurity resides on the outmost layer, not significantly further away from the substrate than ⁴He atoms on the same layer.     

低熔封接玻璃的研究进展

低熔封接玻璃是一种先进的焊接材料,由于其具有低的熔化温度和封接温度,优良的机械强度和化学稳定性,而在很多领域中得到广泛的应用,实现了玻璃、陶瓷、金属、半导体间的相互封接.综述了低熔封接玻璃的研究现状,展望了低熔封接玻璃向无铅化发展的趋势,指出了无铅低熔封接玻璃今后的研究方向.     

玻璃表面处理综述

本文归纳了近年实验室研究与工业生产中玻璃表面常用的处理方法主要包括化学刻蚀、物理刻蚀、表面镀膜等的研究进展,梳理了不同种类玻璃表面处理工艺的优劣,介绍了表征玻璃表面结构、化学组成及电子态的常用分析方法.在未来的玻璃表面处理研究中,除改进现有的表面处理工艺外,还需开发新的表面处理技术.此外,微观上需重视表面化学组成与结构对玻璃性能的影响.     

基于火焰空间与玻璃液热耦合的玻璃熔窑数值模拟

采用数值模拟方法,对火焰空间和玻璃池窑之间的热耦合模拟可行性进行研究,以玻璃液表面中轴线温度偏差作为比较标准,判断热耦合过程是否收敛。研究结果表明：在六至七次循环迭代后计算结果可收敛,而且热耦合模拟的收敛速度与给定的初始条件有关。建立燃天然气富氧助燃玻璃熔窑模型,与火焰空间、玻璃池窑单独模拟相比,热耦合模拟的结果能够更准确地反映喷枪燃料分布等条件对玻璃液流动情况及温度分布的影响,更为细致全面地模拟出玻璃液表面热传输的不均匀性。