首页期刊信息编委及顾问期刊发行联系方式使用帮助常见问题ENGLISH
位置:首页 >> 正文
悬浮体中团聚体的产生机理及其对材料结构与性能的影响(英文)
作者:孙阳 陈瑞峰 丁钰 郭瑞 周立忠 汪长安 黄勇  
单位:北京科技大学材料科学与工程学院 清华大学材料科学与工程系 中国钢铁研究总院  
关键词:团聚体  悬浮体  胶态成型  颗粒间作用势  陶瓷 
分类号:TQ174.6
出版年,卷(期):页码:2009,37(2):264-269
DOI:
摘要:

研究了陶瓷胶态成型过程悬浮体中产生团聚体的微观机理,根据液体介质中陶瓷粉体颗粒之间的作用势,建立了团聚体产生的微观结构模型。利用环境扫描电子显微镜对悬浮体中粉体团聚的显微结构进行"准"直接观察,发现悬浮体中存在2种团聚体形态:I型团聚体(硬团聚)和II型团聚体(软团聚),揭示了团聚体的产生是由于浆料的固相含量偏离了稳定固相含量。研究发现:悬浮体中的团聚体会遗传到陶瓷体中,并对陶瓷构件的力学性能有显著影响。探讨了团聚体对烧结体的结构及力学性能影响的原因。当悬浮体中固相含量低于稳定固相体积分数φ0时,悬浮体中会形成松散团聚即软团聚;当固相含量超过φ0时,悬浮体中会形成紧密团聚即硬团聚;当固相含量等于φ0时,悬浮体具有均匀分散的稳定结构。由于悬浮体固相含量偏离稳定固相含量φ0而在悬浮体中产生的团聚体,会由于原位固化而遗传到坯体之中,影响烧结体结构的均匀性。

how to cheat women who want to cheat wife cheat story
women want men how to cheat how do i know if my wife cheated
why women cheat on husbands online link
read wifes cheat reasons wives cheat on their husbands
My wife cheated on me women cheat because reasons married men cheat
abortion pill abortion pill abortion pill

The micro mechanisms of the generation of agglomerations in ceramic suspensions used in colloidal forming processing were investigated.On the basis of the potential energy between particles in liquid,a microscopic model of agglomerations in ceramic suspensions is presented.Two types of agglomerations,hard agglomeration and loose agglomeration,were observed by environmental scanning electron microscopy as a quasi-direct method,and it was revealed that the generation of agglomeration is caused by the deviation of solid phase content in slurry from the stable solid loading.It was discovered that the agglomerations can be inherited in ceramic bodies,and have a significant influence on the mechanical properties of ceramic articles.The reasons for the influence are dis-cussed from a microscopic view.When the solid phase content in suspension is less than the stable solid phase volume fraction φ0,loose reunions are formed in the suspension.When the solid phase content in the suspension is over φ0,hard agglomerations are produced.When the solid phase content is equal to φ0,the powder particles are evenly dispersed in the suspension and stabilize the structure.The uniformity of the structure of sintered ceramics is influenced as a result,because the agglomerations in the suspension are cured in situ and transmitted to the green body.

how to catch a cheater redirect go
read click link
why married men cheat on their wives reasons wives cheat on husbands women cheat on men
doxycycline doxycycline doxycycline
基金项目:
国家“973”计划(2006CB605207-2)资助项目
作者简介:
read read here link
read why people cheat in relationships signs of infidelity
My wife cheated on me why wives cheat on husbands reasons married men cheat
open reasons why married men cheat My husband cheated on me
abortion las vegas abortion clinics in the bronx abortion pictures
参考文献:

[1]HUANG Yong,ZHANG Liming,YANG Jinlong,et al.Research pro-gress of new colloidal forming processes for advanced ceramics[J](in English).J Chin Ceram Soc(in Chinese and English),2007,35(2):1-10. [2]GIULIANO T.Gelcasting ceramics:a review[J].Am Ceram Soc Bull,2003,82(4):43-47. [3]LANG F F.Powder processing science and technology for increased reliability[J].J Am Ceram Soc,1989,72(1):3-15. [4]SIGMUND W M.Novel powder-processing methods for advanced ceramics[J].J Am Ceram Soc,2000,83(7):1557-1574. [5]BERGSTROM L.Hamaker constants of inorganic materials[J].Adv Colloid Int Sci.,1997,70:125-169. [6]RAHAMAN M N.Ceramic Processing and Sintering[M].New York:M Dekker,2003:567-573 [7]LIU Den-Mo.Dispersion characteristic of nano-sized ceramic powder in an aqueous medium[J].J Mater Sci Lett,1998,17:207-210. [8]LIM L C,WONG P M,JAN M A.Microstructural evolution during sintering of near-monosized agglomerate-free submicron alumina powder compacts[J].Acta Mater,2000,48:2263-2275. [9]ZHANG Liming,MA Tian,YANG Jinlong,et al.Rheological behavior of alumina suspensions[J].J Inorg Mater(in Chinese),2004,19:1145-1150. [10]BENDER J,WAGNER N J.Reversible shear thickening in monodisperse and bidisperse colloidal dispersions[J].J Rheol,1996,40:899-916. [11]TARI G.,FERREIRA J M,FONSECA A T,et al.Influence of particle size distribution on colloidal processing of alumina[J].J Eur Ceram Soc,1998,18:249-253. [12]TAKAI C,TSUKAMOTO M,FUJI M,et al.Control of high solid content yttria slurry with low viscosity for gelcasting[J].J Alloys Compd,2006,408-412:533-537. [13]CHEN Zongqi,WANG Guangxin,XU Guiying.Colloid and Interface Chemistry[M](in Chinese).Beijing:Higher Education Press,2001:183-189. [14]REED J S.Principles of Ceramics Processing[M].New York:John Wiley&Sons,Inc,1988:162-163. [15]CHEN Ruifeng.Generation and evolution of defects in ceramics by gelcasting:mechanisms and applications(in Chinese,dissertation)[D].Beijing:Tsinghua University,2007:57-58.

how do i know if my wife has cheated infidelity in marriage read
open click here go
read click link
My wife cheated on me women cheat because reasons married men cheat
my husband cheated on me click here women who cheat on husband
cialis discount coupons coupons for cialis 2016 cialis 2015 coupon
服务与反馈:
文章下载】【加入收藏
中国硅酸盐学会《硅酸盐学报》编辑室
京ICP备10016537号-2
京公网安备 11010802024188号
地址:北京市海淀区三里河路11号    邮政编码:100831
电话:010-57811253  57811254    
E-mail:jccs@ceramsoc.com