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Search Results: 1 - 10 of 21089 matches for " 成膜速度 "
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钢表面化学气相沉积TiC晶体的择优取向
郭成言,後藤孝,平井敏雄
金属学报 , 1992,
Abstract: 本文用化学气相沉积(CVD)法,以TiCl_4-CH_4-H_2为原料气体,在不锈钢表面获得了致密的TiC膜.研究了TiC的成膜速度、表面形貌和晶体择优取向与沉积条什的关系.结果表明,沉积温度T_(dep),碳钛比CH_4/TiCl_4强烈地影响了TiC的成膜速度、表面形貌和晶体择优取向.CH_4/TiCl_4低时,TiC晶体的择优取向为(220)而CH_4/TiCl_4高时,TiC晶体的择优取向为(200).TiC晶体的择优取向主要取决于气氛中活性碳的平衡浓度。
PREFERRED ORIENTATION OF DEPOSITED TiC COATING ON STEEL BY CVD
钢表面化学气相沉积TiC晶体的择优取向

GUO Chengyan,
郭成言
,後藤孝,平井敏雄

金属学报 , 1992,
Abstract: Investigation was made of the deposition rate, surface morphology and crystal preferred orientation of the dense TiC coating onto austenitic stainless steel in relation with CH_4/TiCl_4 mole ratio and temperature adopted in CVD processing. When the CH_4/TiCl_4 ratio is low or high, their preferred orientation may be (220) or (200), respectively, which is mainly dependent on the equilibrium concentration of active carbon in vapour phase.
自泳涂装工艺及漆膜常见缺陷的排除
涂料工业 , 1995,
Abstract: ?叙述了自泳涂装工艺流程。总结了自泳涂装的管理经验。介绍了自泳涂膜常见缺陷的排除方法。
水基钻井液成膜技术研究进展
白小东,蒲晓林
天然气工业 , 2006,
Abstract: ?水基钻井液成膜技术是当今研究的热点,其核心技术是利用页岩或钻井液的物理、化学特性,使页岩或钻井液具有半透膜的性能或在井壁上形成一层较高质量的隔离膜,阻止钻井液向地层的进一步滤失,从而有效地稳定井壁和保护油气层。文章根据国内外研究的实际情况,对水基钻井液的几种成膜机理进行了探讨,分析了半透膜和隔离膜的实质,总结了成膜水基钻井液、成膜处理剂以及成膜新工艺的应用现状及发展趋势。建议加强对成膜机理以及对所形成膜的性质等方面的研究。同时应在提高膜的功能和环保型成膜剂方面做出不懈努力。
Effects of functional groups on the friction properties of self--assembled monolayers
官能团对自组装分子膜摩擦特性的影响

ZHANG Huichen SUN Changguo YAN Li,
张会臣
,孙昌国,严立

材料研究学报 , 2004,
Abstract: The friction properties of two kinds of self-asssembled monolayers with the same length of molecule chain and different functional groups were investigated. The effects of load and sliding velocity on the friction characteristics of SAMs were analyzed. The results indicate that the stronger the chemical activity of functional group in self-assembled molecules is, the more remarkable the SAMs cluster topography characteristics are. The friction forces increase with increasing the loads for these two self-assembled molecules with short chain. However, the effects of sliding velocity on the friction force appear when the chemical reactivity of functional group in self-assembled molecules is strong enough. The friction forces decrease markedly after the formation of SAMs with stable structure, which exhibits anti-friction effect. The anti-friction effect disappears if the load rises to a threshold for SAMs with stronger active functional group. The stronger the chemical activity of functional group in self-assembled molecule is, the larger the friction forces are.
添加剂对电镀锌稀土转化膜成膜作用机理的研究
章江洪,张英杰
材料工程 , 2011,
Abstract: 采用添加氧化剂和成膜促进剂的化学浸泡法在电镀锌层表面制备稀土转化膜,氧化剂和成膜促进剂的加入,对有效形成高耐蚀性的稀土转化膜起到了至关重要的作用。通过电化学测试、形貌分析以及动力学数据计算,结果表明H2O2作为氧化剂加入到处理液中,一方面可加快微阴极发生还原反应,另一方面通过发生H2O2的还原反应,促进微阴极区pH上升,有利于形成富含铈的转化膜;成膜促进剂的加入可改善膜层的外观质量,其加入的实质是通过有效降低成膜三个反应阶段的表观活化能,从而实现对转化膜生长的促进。
SIMULTANEOUS FORMATION AND POLYMERIZATION OF POLYPHENYLACETYLENE FILMS BY RARE-EARTH COORDINATION CATALYSTS V. Simultaneous Formation and Polymerization of Polyphenylacetylene Films by Neodymium-Ferrum Mixed Coordination Catalysts
稀土络合催化苯乙炔直接成膜聚合 Ⅴ.苯乙炔在钕、铁混合络合催化体系中的直接成膜聚合

ZHAO Jian,YANG Mu-jie,ZHANG Wen-de,SHEN,Zhi-quan,
赵健
,杨慕杰,张文德,沈之荃

高分子学报 , 1990,
Abstract: Simultaneous formation and polymerization of polyphenylacetylene (PPA) films by Nd(AA)3-Fe(AA)3-Al(i-Bu)3 or Nd(BA)3-Fe(BA)3-Al(i-Bu)3 mixed, coordination catalysts was carried out in the toluene/hexane solvents at room temperature. The features and kinetic behaviour of polymerization, and properties of PPA films have been investigated. It is pointed out that neodymium-ferrum mixed catalysts show combined catalytic effects.
自组装膜有机化学
张学群,韦钰
有机化学 , 1994,
Abstract: 自动形成有序有机薄膜可通过自组装(SA)技术得到.SA成膜技术快速简便,SA膜对热,时间,化学环境及外压稳定,有较高的二维或三维有序性,是获得超晶格有序材料的一种有效方法,在非线性光学,分子器件,分子生物学及表面材料工程中都有潜在的应用前景.
凝汽器铜管FeSO4成膜的应用与研究
康桃英(),杨尚东()
腐蚀科学与防护技术 , 2004,
Abstract: 凝汽器铜管在进行FeSO4一次性成膜保护的过程中出现上膜困难,膜质疏松、易脱落等问题.通过对铜管表面处理、工艺上采用联合处理等改进措施,在促使铜管尽快上膜,保证膜质的致密、牢固上取得了很好效果.
圆盘反应器的流动与混合特性
张伟,赵文忠
华东理工大学学报 , 1997,
Abstract: 运用流体力学理论对圆盘反应器的成膜,混全和流动特性进行分析。简化模型,结合实验研究,得到关于其成膜,混合流动与表面更新等方面的基本规律和流场特性。为反应器放大和设计提供理论依据。
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