Experimental parameters during optical floating zone crystal growth of rare earth silicides

Optical floating zone（FZ） crystal growth involving growth stability and as-grown crystal perfection is affected by experimental conditions and the specific material. Referring to rare earth silicides, high purity of raw rare earth elements and ambient argon atmosphere are crucial to grow high-quality crystals; the maximum zone height is determined by equating the capillary forces of the surface tension; and asymmetric counter rotation of crystal and feed rod with convex（toward the melt） interfaces are favored to reach single crystals. Influences of several other growth parameters were also discussed in detail in this paper.     

VR技术现状与应用领域研究

分析了VR技术发展现状和存在的技术瓶颈,深入分析并预测了VR技术在购物平台、游戏、事件直播、医疗保健、房产、军事、旅游、电影、工程、教育十大领域应用,通过典型案例介绍其应用场景,最后介绍VR技术上下游产业链以供企业转型升级找准自己的定位.     

混合稀土及半固态等温热处理对原位Mg_2Si/Al复合材料组织与性能的影响

在原位Mg2Si/Al复合材料中,通过混合稀土变质及半固态等温热处理,分析变质及等温热处理后材料组织与力学性能的变化。结果表明:添加0.8%的混合稀土对Mg2Si起到很好的变质效果,初生Mg2Si的形貌由变质前的粗大十字状变为均匀分布的不规则块状,平均尺寸由变质前的74μm减小至24μm左右;同时,材料的力学性能也显著提升,抗拉强度由变质前的134 MPa提高至187.5 MPa,布氏硬度由HB 74.5提升至HB 89.5左右。最佳的等温热处理工艺为600℃保温90 min,此时,材料中初生Mg2Si转变为近球形,其形状因子为0.93左右,平均尺寸29μm左右。     

上市公司关注度排行榜

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Synthesis of lanthanum ricinoleate and its effect on thermal stability and mechanical properties in PVC

The lanthanum ricinoleate（abbreviated as Lari3） of rare earth heat stabilizer was synthesized by the reaction of ricinoleic acid, lanthanum nitrate and sodium hydroxide. The IR and fluorescence spectra methods confirmed the structure of the product. The thermal stability of PVC in the presence of Lari3 was studied by the Congo method and using TG analysis. The results showed that Lari3 could be used as a thermal stabilizer for PVC. When the ratio of Lari3/pentaerythritol was 3：1, the complex exhibited better synergistic effect. Incorporation of Lari3 to PVC resulted in a marked increase of maximum and onset degradation temperature as well as elongation and impact strength of PVC. Lari3 might replace the labile chlorine atoms to interrupt the formation of conjugated double bonds in PVC chains and act as HCl scavenger to restrain the self-catalyticdehydrochlorination.     

稀土永磁同步电机及变频调速技术在城市自来水厂的应用

城市自来水厂是耗能大户,节能潜力很大。通过分析水厂水泵机组耗能现状及高耗能原因,在国内首次将稀土永磁同步电机及变频调速技术成功用于自来水厂拖动水泵运行,节能效果非常好,用电量减少20%以上,降低了自来水的生产成本,并减少了碳排放,取得了良好的经济效益和社会效益。     

Ganzhou Qiandong Rare Earth Group Go.,Ltd.

Ganzhou Qiandong Rare Earth Group Co.,Ltd .is located in Qiandong Road.Shuidong Town.Zhanggong District of Ganzhou City .The predecessor is Ganzhou Qiandong Industrial（Group）Co.,Ltd.     

华意压缩机股份有限公司

华意压缩机股份有限公司始创于1990年．拥有国领先的压缩机生产技术及各类先进的检验检测设备，经过20多年不懈的努力，从引进、消化、吸收到再创新．已形成完整的产业链。公司自主打造的”华意”牌”环保、节能、高效”压缩机．深受国内外用户好评。”华意”牌压缩机先后荣获”中国名牌”和“中国驰名商标”称号．成为全球主流冰箱企业的优秀供应商。     

新材料产业“十二五”发展规划之特种金属功能材料

编者按:特种金属功能材料被列为《新材料产业"十二五"发展规划》6大重点发展方向之首,在400项新材料产业"十二五"重点产品目录中,特种金属功能材料有128种,其重要性不言而喻!稀土功能材料、铜铟镓硒等新型薄膜光伏材料、铁基非晶合金带材、软磁材料、大尺寸单晶硅等均被纳入其中。128种重点