复相α—β—sialon陶瓷的微波反应烧结

微波烧地因具有极快的加热和烧结速度及内在性和体积性加热等特征使制品有潜力均匀地烧结，并获得较高的密度和均匀的微观结构通过适当的保温方式，名义组成为α：β＝２０：８０的复相α－β－ｓｉａｌｏｎ陶瓷在２．４５ＧＨｚ单模腔微波烧结系统于１６５０℃保温１０ｍｉｎ能完全反应，烧结致密，获得较高的密度和较小的晶粒尺寸及好的力学性能。     

氮化硅陶瓷的微波烧结

利用ＴＥ１０３单模腔微波烧结系统对添加６％（Ｙ２Ｏ３＋Ａｌ２Ｏ３）的α、β－ＳｉＮ４粉的微波加热特征进行了研究。通过选择合理的保温材料和烧结工艺，获得了较高密度、结构均的氮化硅烧结体。实验发现，对于粉末为α－Ｓｉ３Ｎ４的试样，在相变发生的温度内，相变的发生比较密化进程更早而且发生在一个相对更低的温度，研究结果也表明，在微波烧结中相变促进致密化进程。在较短的内警备交高的密度和较好的力学性质，氮化硅的     

（Ba0.5Pb0.5）O.La2O3.4TiO2—（Zr0.8Sn0.2）TiO4复合系统的微波介 …

研究了（Ｂａ０．５Ｐｂ０．５）Ｏ．Ｌａ２Ｏ３．４ＴｉＯ２－（Ｚｒ０．８Ｓｎ０．２）ＴｉＯ４复合系统的微波介电性能,烧结性能和微观结构,发现复合系统由（ＢａＰｂ）６－ｘＬａ８＋２ｘＴｉ１８Ｏ４．Ｌａ４Ｔｉ９Ｏ２４和（Ｚｒ０．８Ｓｎ０．２）ＴｉＯ４３相组成,而（Ｂａ０．５Ｐｂ０．５）Ｏ．Ｌａ２Ｏ３．４ＴｉＯ２除了（ＢａＰｂ）６－ｘＬａ８＋２ｘ３Ｔｉ１８Ｏ５４和常数,频率温度系数,Ｑ因子主要与其中的相组     

氧化铈（CeO2）在增韧陶瓷材料中的应用

本研究以氧化铈作稳定剂，采用粉末冶金冷压烧结工艺制备氧化铈部分稳定化氧化锆增韧氧化铝陶瓷复合材料（Ｃｅ－ＺＴＡ），分析了材质的力学性能和显微结构。结果表明，ＣｅＯ２对四方相氧化锆具有稳定作用，当ＣｅＯ２含量为１０￣１２ｍｏｌ％时，如果晶粒尺寸达４￣５ｕｍ，则Ｃｅ－ＺＴＡ复合材料的韧性和强度均能最大程度地提高。     

纳米Al2O3-ZrO2(3Y)复相陶瓷的微波烧结

采用纳米Ａｌ２Ｏ３粉和纳米ＺｒＯ２（３Ｙ）粉为原料,对不同成分配比的Ａｌ２Ｏ３－ＺｒＯ２（３Ｙ）复相陶瓷进行了微波为烧结的研究。实验结果表明微波烧结可获得委肮的致密度,并提高断裂韧性,但晶粒长大倾身大于其它烧结方式;在Ａｌ２Ｏ３－ｚｒ２（３Ｙ）二元系中,随ＺｒＯ２（３Ｙ）含量啬,烧结时的致密化过程加速,且晶粒长大倾向减小。     

Al2O3陶瓷基片的微波烧结

本文简要介绍了微波烧结的特点，基本原理及系统组成，对Ａｌ２Ｏ３陶瓷基片的微波烧结过程进行了介绍和分析，并同常规烧结进行了对比实验，在此基础上得出了一些结论，为陶瓷微波烧结提供了实验的依据。     

制备γ—LiAlO2陶瓷芯块的工艺参数研究

本采用冷压－烧结工艺研究了γ－ＬｉＡｌＯ２陶瓷芯块密度ρ（克／厘米＾３）与压制压力Ｐ（ＭＰａ），烧结温度Ｔ（℃）烧结时间（小时）和添加剂量Ｍ（克ＰＶＡ／克干粉）等工艺参数之间的关系，由实验结果，可归纳出如下关系式：ρ＝２．５×１０＾－３Ｐ＾０．１９Ｔ＾０．７５ｔ＾０．０３３Ｍ＾－０．０５（Ｍ＞０），此式可作为制备γ－ＬｉＡｌＯ２陶瓷芯块的工艺依据。     

无压烧结Si3N4—3YZrO2复相陶瓷材料的力学性能和增韧机理研究

在以４％Ａｌ２Ｏ３作为烧结助剂的Ｓｉ３Ｎ４基体中分别添加５％，１０％，２０％，３０％的３ＹＺｒＯ２，经１８００℃无压烧结。共室温断裂韧性在到５．２－７．６ＭＰａ．ｍ＾１／２，是基体材料的２．４－３．５倍。     

氮化铝陶瓷的微波烧结研究

利用ＴＥ１０３单模腔微波地系统对ＳＨＳ制备的ＡｌＮ粉的加热烧结特征，烧结样品的显生结构进行了研究。通过适当的保温措施和烧结工艺实现了ＡｌＮ陶瓷的微波快速烧结。     

中温烧结MgO—TiO2—ZnO系陶瓷结构和性能的研究

本文在研究中温烧结ＭｇＯ－ＴｉＯ－ＺｎＯ系陶瓷基础上，获得了温度系数接近于零的瓷料（ＮＰＯ）。ＸＲＤ证明其主晶相为正钛酸镁（２ＭｇＯ．ＴｉＯ２）还有正钛酸锌（２ＺｎＯ．ＴｉＯ２）和ＣａＴｉＯ３附加晶相，同时研究了各组分的不同含量对介电性能的影响。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。