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与扩散的控制机制. 关键词: TaC涂层；氧化特征；氧化机理；活化氧化 中图分类号:TQ 050.4 文献标识码:A Oxidized characteristic and oxidized mechanism of TaC coating LI Guo-dong, XIONG Xiang, HUANG Bai-yun, ZENG Yu-lin (State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China) Abstract: The oxidized characteristic and oxidized mechanism of TaC coating at different......
Ablation mechanism of TaC coating fabricated by chemical vapor deposition on carbon-carbon composites LI Guo-dong(李国栋)1, 2 , XIONG Xiang(熊 翔)1 , HUANG Ke-long(黄可龙)2 1. State Key Laboratory.... The results show that the TaC coating is decomposed at the initial stage of laser ablation in atmosphere, and free carbon diffused to the surface, then oxidized to the melt including carbon, oxygen......
Article ID: 1003-6326(2005)06-1206-08 Microstructure characteristic and formation mechanism of crackfree TaC coating on C/C composite LI Guo-dong(李国栋), XIONG Xiang(熊 翔), HUANG Bai-yun(黄...-resistant TaC coating deposited on the C/C composite by Chemical Vapour Deposition(CVD) were investigated, using the reaction system of TaCl5-C3H6-H2-Ar. The results show that the nanosized pore......
,则容易生长成<220>取向的多角形晶粒. 关键词:TaC涂层；化学气相沉积；择优取向；微观形貌 中图分类号:TB 332 文献标识码:A Surface morphology of TaC coating prepared by chemical vapor deposition and preferential growth... and microstructure of CVD-TaC coating[J]. The Chinese Journal of Nonferrous Metals, 2005, 15(4): 565?571. [2] LI G D, XIONG X, HUANG B Y. Microstructure characteristic and formation mechanism of crackfree TaC......
C/C复合材料表面TaC涂层的制备和生成机制 黄伯云1,李江鸿1,肖鹏1,熊翔1,张红波1 (1.中南大学,粉末冶金国家重点实验室,湖南,长沙,410083) 摘要:报道了一种在C/C复合材料基体上制各抗烧蚀TaC涂层的新方法.采用红外光谱,XRD及SEM表征了生成TaC涂层的Ta源:TaO2F·rH2O·TaF5.采用SEM观察了不同温度下转变生成的TaC涂层的形貌.在1200℃高温热处理,TaC涂层形貌为细颗粒状,在1800℃高温热处理后,TaC涂层为柱状晶.TaC的生成机制为:TaO2F·rH2O·TaF5高温分解凝聚生成的Ta2O5沉积在C/C复合材料基体表面,碳原子在Ta2O5中扩散反应生成TaC,TaC涂层形貌可由生成Ta2O5的凝聚成核理论解释. 关键词:TaC涂层; 制备; 生成机制; [全文内容正在添加中] ......
and microstructure of CVD-TaC coating LI Guo-dong1, 2, XIONG Xiang1, HUANG Bai-yun1 (1. State Key Laboratory of Powder Metallurgy, Central South University,Changsha 410083, China;2. Xiangfan University, Xiangfan 441003, China) Abstract: he TaC coating and C-TaC composite coating on the surface of carbon/carbon composites were prepared by CVD method in TaCl5-C3H6-H2-Ar system. The influences......
C/C复合材料抗烧蚀TaC涂层的制备 何捍卫1,熊翔1,周科朝1 (1.中南大学,粉末冶金国家重点实验室,湖南,长沙,410083) 摘要:报道1种制备C/C复合材料抗烧蚀TaC涂层的新技术.用红外光谱,XRD及SEM分析和表征醇基钽膜,用XRD和SEM分析和表征TaC涂层.制备出的醇基钽是非晶态结构,在C/C复合材料上将这种凝胶铺展形成致密的多层膜.在石墨化炉中多层膜被转化为TaC涂层.在1 200℃时,形成的涂层中含有TaC和Ta2O5.高于1 400℃时涂层中只有TaC存在.1 600℃时所形成的涂层是1种连续致密的层状结构,1 400℃时所形成的涂层是1种多微孔的网状结构. 关键词:抗烧蚀; TaC涂层; C/C复合材料; [全文内容正在添加中] ......
伯云. 温度对CVD-TaC涂层组成,形貌与结构的影响[J].中国有色金属学报, 2005, 15(4): 565-571.LI Guo-dong, XIONG Xiang, HUANG Bai-yun. Effect of temperature on composition, surface morphology and microstructure of CVD-TaC coating[J...文章编号:1004-0609(2010)09-1759-07 预制体类型及孔隙结构对化学气相渗透TaC的影响 陈招科, 熊 翔, 李国栋 (中南大学 粉末冶金国家重点实验室,长沙 410083) 摘 要:在分析和计算机准三维(2.5D)针刺整体炭毡,低密度炭毡孔隙结构的基础上,研究不同温度和压力下反应气体在上述预制体孔隙中的扩散行为,TaC的沉积速率及渗透深度.结......
wt%,20 wt%,30 wt%,40 wt%).The microstructure and corrosion behavior of the coatings were investigated in detail.The coating without TaC is composed of TiNi/Ti2Ni(matrix) and TiC/TiB/TiB2(reinforcement... of 0.003,0.080,0.204 and 0.605 V).When the content of TaC exceeds 20 wt%,no breakdown phenomenon is observed.The passive film on the surface of coating without TaC is mainly composed of TiO2,Al2O3,Cr2O3,CrO3,NiO,Ni2O3......
C/C多孔体中TaC晶须的制备及生长机理李江鸿,张红波,熊翔,肖鹏,黄伯云中南大学粉末冶金国家重点实验室摘 要:采用真空加压浸渍法,在C/C多孔体中浸渍TaF5溶液制备TaC晶须.通过扫描电镜(SEM)观察TaC形貌,发现晶须呈单根或束状,且晶须光滑,平直,直径小于1μm.晶须头部的球状液滴表明其生长机理为气-液-固(V-L-S)机制,但反应过程中的球状液滴不是由催化剂与反应体系形成的共融球,而是生成TaC晶须的反应组元Ta2O5液滴,由TaF5高温水解生成.热解炭原子在单个或团簇的Ta2O5液滴中扩散生长出单根或束状的TaC晶须.关键词:TaC晶须;制备;生长机理;......
