汽车顶棚用轻质GMT吸音性能的研究

研究了轻质玻璃纤维毡增强热塑性复合材料(GMT)板材的面密度、成型厚度、透气率以及GMT汽车内饰顶棚与钣金间隙4个因素与顶棚吸音性能的关系。结果表明,GMT汽车内饰顶棚的吸音系数受GMT板材面密度的影响不大,但随成型厚度的增加而增大;高透气率的顶棚的吸音系数在高频区最大;增加GMT汽车内饰顶棚与钣金之间的间隙可以显著提高顶棚在低频和中频区的吸音系数。     

轻质GMT复合材料在汽车后隔板上的应用

热塑性复合材料在汽车上发挥着重要作用,轻质玻璃纤维增强聚丙烯复合材料(GMT)和PP(聚丙烯)木粉板复合材料也逐渐应用到汽车的很多方面。通过对比轻质GMT和PP木粉板板材以及两种基材的后隔板性能,结果显示:轻质GMT后隔板在比PP木粉板后隔板质量低的情况下,其大部分性能仍相当。并且2种基材后隔板的零部件挥发性有机物(VOC)显示PP木粉板后隔板的苯系物和醛酮挥发量比轻质GMT后隔板的高约6~8倍。轻质GMT在汽车轻量化和环境友好性上更有优势。     

GMT—新一代增强热塑性塑料片材

湿法玻纤毡增强热塑性塑料片材(GMT),是近几年才问世的新一代增强热塑性塑料(FRTP)片材,也即冲压流动模型的半成品,其主要产品是汽车部件。GMT的发展速度快,前景可观,我国有必要尽快研制。本文简略介绍GMT工艺     

玻璃纤维增强热塑性复合材料的研究进展

综述了LFT和GMT加工工艺的进展，介绍了最新的两种GMT材料，提出了玻璃纤维增强热塑性复合材料的发展方向，并对未来趋势作出预测。     

湿法制造热塑性片材的工艺技术研究Ⅰ.热塑性片材概论

本文介绍了玻璃纤维毡增强热塑性片材（GMT）的特点，分类及制造工艺；阐述了湿法即介质悬浮法制造热塑性片材的工艺流程及专用设备。     

PP-g-MAH预浸渍玻璃纤维毡对GMT界面改性的作用

采用含有马来酸酐接枝聚丙烯(PP–g–MAH,简称MPP)的聚丙烯(PP)树脂对玻璃纤维(GF)毡预浸渍,进行增强体改性,通过直接浸渍工艺、增强体预浸渍工艺、累加浸渍工艺等不同工艺制备GF毡增强PP热塑性复合材料(GMT)。对不同工艺制备的GMT界面形态进行了扫描电子显微镜分析,并测定了预浸渍处理后GF的疏水性,研究了预浸渍工艺中MPP的用量对GMT拉伸、弯曲、冲击等力学性能的影响。结果表明:采用含MPP的PP树脂进行增强体预浸渍改性的方法,改性树脂对GF的包覆效果良好,经预浸渍改性法处理的GF,其疏水性增强;并可以获得与PP/MPP改性树脂直接浸渍GF毡时相似的界面改性效果和相近的GMT力学性能;样品界面改性效果相近的情况下,增强体预浸渍改性方法所需的MPP用量明显少于改性树脂直接浸渍时的用量。     

GMT片材的制造与应用技术 Ⅱ．GMT片材的力学性能

本文分析了GMT制品性能、结构设计的多样性与灵活性;总结了GMT材料的特点;阐明了熔融浸渍工艺生产GMT材料的主要性能影响因素。研究结果表明,采用组合增强、基体增韧及基体增强合金等途经可有效改善GMT材料的力学性能,以满足各类GMT制品的性能需求。对GMT材料的发展趋势提出了见解。     

连续毡及GMT在汽车材料中的应用研究进展

本文介绍了连续毡的主要性能和在汽车中的典型实用情况；并介绍了GMT的性质、特点及其在汽车中的应用前景，我国GMT的研究开发现状。     

玻璃纤维增强碱式硫酸镁水泥制备工艺研究

以玻璃纤维为增强材料,木屑为轻质骨料,碱式硫酸镁水泥为胶凝材料制备了复合板材.研究了水泥的氧化镁活性、摩尔比、水灰比、外加剂掺量、养护温度、玻璃纤维层数对复合板材不同龄期下的抗折强度和抗压强度的影响.研究结果表明,采用a-MgO/MgSO4摩尔比为6.0,水灰比为0.35,木屑掺量为20%,玻璃纤维层数为3时可制备出抗压强度为35.89 MPa,抗折强度为15.6 MPa的复合板材.采用高温养护,可提高复合板材的早期强度.采用XRD、SEM分析了外加剂和养护工艺对水化相组成和形貌的影响.     

连续纤维增强热塑复合材料研发及应用

介绍了热塑性树脂连续纤维复合材料(CFRT)的模压工艺和注塑工艺,以及CFRT产品最新应用领域,并对CFRT与GMT的工艺进行了分析比较。产品研发和产业开发结果表明:玻纤质量分数为63%时,其CFRT拉伸强度515 MPa,拉伸模量25.9 GPa,弯曲强度380 MPa,弯曲模量22.7 GPa,比GMT分别提高了24%、19%、21%和17%;成功或正在开发CFRT板材,“三明治”夹层结构石油管道、集装箱体、劳动防护鞋包头等产品和应用市场。最后指出CFRT技术目前存在的问题,今后研发方向以及产业化发展趋势。     

重金属氧化物玻璃：第二部份 玻璃结构与析晶行为

近年来,对重金属氧化物玻璃(HMO glass)的研究已成为玻璃材料研究领域内的一个热门课题,不仅是因为在实践上此材料有特别优良的光学、磁学和电学性质,可成为光     

氟挥发对氟化物乳白玻璃瓶罐生产的影响

氟挥发对氟化物乳白玻璃瓶罐生产的影响陆德明，周俊梅，付希英（山东轻工业学院２５０１００）（山东德州玻璃厂２５３０１９）ＴｈｅＩｎｆｌｕｅｎｃｅｏｆＦｌｕｏｒｉｎｅＶｏｌａｔｉｌｉｚａｔｉｏｎｏｎＰｒｏｄｕｃｔｉｏｎｏｆＦｌｕｏｒｉｄｅｏｐａｌＧｌａｓ...     

使用PVB膜片作为安全玻璃夹层的常见问题与改进方法

研究了聚乙烯醇缩丁醛（PVB）膜片、浮法玻璃和夹玻工艺对夹层安全玻璃的影响,探讨夹玻的各个工序中出现不正常的原因,并提出解决问题的应对方法,提高了最终制品的质量,实现夹玻的科学生产.     

玻纤增强ABS复合材料的研究

以短切玻璃纤维为改性填料,对通用ABS进行共混改性。结果表明:ABS 玻纤复合材料的拉伸强度、弯曲强度、硬度以及热变形温度都随共混体系中玻纤含量的增加而显著提高,而材料的冲击强度和断裂伸长率却随之下降。此外,玻纤的长径比和共混挤出温度对材料的机械性能也有很大的影响。     

Scintillation characteristics of transparent Eu2O3–BaO–TeO2 glass-ceramics

Tellurite glass (TeG) and its glass-ceramics (TeGC435 and TeGC455), with a composition of 10Eu₂O₃–10BaO–80TeO₂, were prepared and their luminescence properties were evaluated. TeG was prepared via the melt quenching technique, while TeGC435 and TeGC455 were fabricated by heat treating TeG at 435 and 455 °C, respectively, for 5 h each. The Eu₂Te₆O₁₅ crystal phase was formed in TeGC435 and TeGC455. Both the glass and glass-ceramics showed sharp photoluminescence and scintillation peaks, attributed to the 4f→4f transitions of Eu³⁺. The highest quantum yield was obtained for TeG, whereas the highest integrated scintillation intensity was obtained for TeGC455. The scintillation intensity of TeGC455 was approximately 10% of that of the Bi₄Ge₃O₁₂ single crystal. Furthermore, typical decay times derived from the 4f→4f transitions were obtained for TeG, TeGC435, and TeGC455 during photoluminescence and scintillation.     

建筑玻璃发展趋势的探讨

陈述了节能玻璃、结构件玻璃、异形曲面玻璃、新型装饰玻璃、新材料复合玻璃、多功能复合玻璃、超大版幅玻璃将广泛地应用于建筑物,成为建筑玻璃的主流产品。     

HEAT TRANSFER DURING GLASS FORMING

An important step in the optimization of a glass container production cycle is the determination of the glass temperature distribution during heat treatment. The ideal approach to this problem is to formulate a theoretical model for comparison against experimental data measured in a well-determined system. Discrepancies between theory and experiment may then give further direction for model improvement. This approach, however, is limited because of the difficulties in measuring glass temperature distribution during forming.

Another approach is to use the model to predict glass surface heat fluxes during the forming cycle and test the computed results against published values of glass to metal heat fluxes measured during glass container production on an individual section (I.S.) Blow-and-Blow bottle machine.

A computer model has been developed to calculate the temperature distribution in a glass plate. The model includes the three modes of heat transfer: conduction, convection and radiation. The process is complicated by simultaneous internal emission and reabsorption of radiant energy within the glass in the non-opaque region of the spectrum. With the problem being simplified to a one-dimensional case, the glass plate is divided into several slices. An energy balance on each slice yields a system of integro-partial differential equations which are solved to obtain the temperature distribution.

Results in the form of temperature-time, temperature-distance and surface heat flux-time plots arc presented and compared with published models and with experimental data.     

Effect of K2O on structure-property relationships and phase transformations in Li2O-SiO2 glasses

Glass compositions with formula (71.78 − x)SiO₂-2.63Al₂O₃-(2.63 + x)K₂O-23.7Li₂O (mol.%, x = 0-10) and SiO₂/Li₂O molar ratios far beyond that of stoichiometric lithium disilicate (Li₂Si₂O₅) were prepared by conventional melt-quenching technique to investigate the influence of K₂O content on structural transformations and devitrification behaviour of glasses in the Li₂O-SiO₂ system. The scanning electron microscopy (SEM) examination of as cast non-annealed glasses revealed the presence of nanosized droplets in glassy matrices suggesting occurrence of liquid-liquid phase separation. An overall trend towards depolymerization of the silicate glass network with increasing K₂O content was demonstrated by employing magic angle spinning-nuclear magnetic resonance (MAS-NMR) spectroscopy. The distribution of structural units in the experimental glasses was estimated using ²⁹Si MAS-NMR spectroscopy suggesting the appearance of Q², enhancement of Q³ and diminishing of Q⁴ groups with increasing K₂O contents. X-ray diffraction (XRD) and differential thermal analysis (DTA) were used to assess the influence of K₂O on devitrification process and formation of lithium disilicate (Li₂Si₂O₅) and/or lithium metasilicate (Li₂SiO₃) crystalline phases.     

Preparation and characterization of foams from sheet glass and fly ash using carbonates as foaming agents

Glass foams were produced using sheet glass cullet and fly ashes from thermal power plant with added carbonates (commercial dolomite- and calcite-based sludges) as foaming agents. The influence of type and amount of carbonates as well as of the sintering temperature on the apparent density, compressive strength, microstructure and crystalline phases was evaluated. The experimental results showed that homogenous microstructures of large pores could be obtained by adding just 1–2 wt.% carbonates and using low sintering temperature (850 °C), leading to foams presenting apparent density and compressive strength values of about 0.36–0.41 g/cm³ and 2.40–2.80 MPa, respectively. Good correlations between compressive strength, apparent density and microstructure (pore size, struts’ thickness and internal porosity) were observed.     

不同材料填充超高摩尔质量聚乙烯复合材料的力学性能分析

对纳米Al2O3、玻纤粉、石墨、微珠粉等材料填充的UHMWPE复合材料进行了拉伸、强度和磨损性能试验。结果表明：不同填料对UHMWPE性能的影响不一样，几种填料填充UHMWPE后，其硬度及耐磨性有不同的改善，而拉伸强度和断裂伸长率有不同程度的下降；其中以质量分数为10％的纳米Al2O3填充UHMWPE综合性能最佳；石墨填充材料的加入会使UHMWPE拉伸强度和断裂伸长率下降较大，脆性增大，但可较好地改善UHMWPE的耐磨性。