Surface Chemistry, Dispersion Behavior, and Slip Casting of Ti3AlC2 Suspensions
Surface Chemistry, Dispersion Behavior, and Slip Casting of Ti3AlC2 Suspensions
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Ti3AlC2 悬浮液的表面化学、分散行为和注浆成型
DOI：
10.1111/j.1551-2916.2009.03136.x
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发表时间：
2009-08
影响因子：
3.9
通讯作者：
Zhou, Yanchun
中科院分区：
文献类型：
--
作者：
Sun, Ziqi;Li, Meishuan;Hu, Longfei;Lu, Xinpo;Zhou, Yanchun
通过水解、吸附、动电学和流变测量研究了 Ti(3)AlC(2) 水悬浮液的表面化学和分散性能。 Ti(3)AlC(2)颗粒具有复杂的表面羟基，如相当于Ti-OH、=Al-OH、-OTi-(OH)(2)等。Ti(3)AlC(2)颗粒的表面电荷和悬浮液的离子环境受这些表面基团的控制，从而强烈影响Ti(3)AlC(2)悬浮液的稳定性。将PAA分散剂添加到Ti(3)AlC(2)悬浮液中，通过吸附保护机制抑制表面基团的水解，并通过空间效应增加悬浮液的稳定性。含有2.0 dwb% PAA的Ti(3)AlC(2)悬浮液在pH=接近5时具有优异的稳定性，并呈现牛顿流体的特性。在分散良好的悬浮液的基础上，通过注浆成型和无压烧结得到了致密的Ti(3)AlC(2)材料。这项工作为需要复杂形状、大尺寸或受控微观结构的MAX相陶瓷的工程应用提供了一种可行的成形方法。
The surface chemistry and dispersion properties of aqueous Ti(3)AlC(2) suspension were studied in terms of hydrolysis, adsorption, electrokinetic, and rheological measurements. The Ti(3)AlC(2) particle had complex surface hydroxyl groups, such as equivalent to Ti-OH,=Al-OH, and -OTi-(OH)(2), etc. The surface charging of the Ti(3)AlC(2) particle and the ion environment of suspensions were governed by these surface groups, which thus strongly influenced the stability of Ti(3)AlC(2) suspensions. PAA dispersant was added into the Ti(3)AlC(2) suspension to depress the hydrolysis of the surface groups by the adsorption protection mechanism and to increase the stability of the suspension by the steric effect. Ti(3)AlC(2) suspensions with 2.0 dwb% PAA had an excellent stability at pH=similar to 5 and presented the characteristics of Newtonian fluid. Based on the well-dispersed suspension, dense Ti(3)AlC(2) materials were obtained by slip casting and after pressureless sintering. This work provides a feasible forming method for the engineering applications of MAX-phase ceramics, wherein complex shapes, large dimensions, or controlled microstructures are needed.
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影响因子：
3.9
作者：
S. Wildhack;G. Rixecker;F. Aldinger
通讯作者：
S. Wildhack;G. Rixecker;F. Aldinger
DOI：
10.5860/choice.39-5835
发表时间：
2002
期刊：
--
影响因子：
--
作者：
A. King
通讯作者：
A. King
影响因子：
15.6
作者：
J. Lyklema
通讯作者：
J. Lyklema
影响因子：
9.9
作者：
Oliveira, M;Olhero, S;Ferreira, JMF
通讯作者：
Ferreira, JMF
影响因子：
3.3
作者：
Steven H. Szczepankiewicz;A. Colussi;M. Hoffmann
通讯作者：
Steven H. Szczepankiewicz;A. Colussi;M. Hoffmann