Modification of Ceramic Powders by Utilizing Organic-Inorganic Hybrid Interface

利用有机-无机杂化界面对陶瓷粉末进行改性

基本信息

批准号：
10555219
负责人：
EGASHIRA Makoto
金额：
$ 7.68万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

Preparation of various new functional meterials and improvement of its properties were attempted as below.1.Chemical stability of metal nitride powders against water was improved by surface chemical modification with sebacic acid, while maintaining a hydrophilic surface. Treatment of the sebacic acid-modified powder with yttrium acetate resulted in strong immobilization of Y^<3+> ions, as a sintering aid, at a highly dispersive level on the metal nitride powder surface through ion exchange. By selecting slip compositions for better deflocculation and firing conditions, a thermal conductivity of ca.250 W m^<-1>K^<-1> was attained by the pressureless sintering of AIN at 1900℃ for 5h.2.Closely packed monolayer of spherical oxide perticles of sub-micron size was fabricated on a silicon or glass substrate by employing a Langmuir-Blodgett film of 1, 12-dodecanedicaboxylic acid, followed by dehydration-condensation reatcion between carboxyl groups of the dicarboxylic acid and the surface hydroxyl groups of both the substrate and the ceramic spheres.3.Ordered mesoporous SnO_2 powders with high thermal stability and a high surface area 305 m^2g^<-1> were prepared from sodium stannate by utilizing the self-assembly of n-cetylpyridinium chloride, followed by treatment with phosphoric acid and calcinations at 600℃ for 5h.4.SnO_2 powder was subjected to surface chemical modification with diethyoxydimethylsilane and the gas sensing properties were evaluated. The SiO_2 introduced by the surface modificaton was found to exist as a grain-boundary phase from TEM observation. The limitation of neck growth between SnO_2 particles by the SiO_2 thin film coating is anticipated to be responsible for increasing the potential barrier height and improving the sensing properties to inflammable gases such as H_2, CH_4 and C_3H_8.

在下面尝试了各种新功能仪的制备和其性能的改善。1。通过用果脂酸的表面化学修饰，可以改善金属硝酸盐粉对水的化学稳定性，同时保持亲水性表面。用乙酸Yttrium Yttrium对皮脂酸改性粉末的处理导致Y^<3+>离子的强烈固定，作为一种烧结的辅助，在金属氮化物粉表面通过离子交换上的高度分散水平。通过选择滑动组合物以获得更好的屈服和发射条件，通过AIN在5H.2上的无压烧结在5H.2中连接了250 w m^m^<-1> k^<-1>的导热率。 1，12个二烷com氧基酸，然后在二羧酸的羧基与底物和陶瓷球的表面羟基之间进行脱水 - 凝结重复。3。订购的介孔SNO_2粉末，由高表面积和高表面积的稳定性制备了305 m^2g^2g 2g^2g^2g^<-1> N-甲基吡啶丁基的自组装，然后用磷酸和钙在600℃下进行5H.4.4.SNO_2粉末对二甲氧基二甲基硅烷进行表面化学修饰，并评估气体敏感性。发现表面修饰引入的SIO_2被发现是从TEM观察中作为晶界相存在的。 SIO_2薄膜涂层在SNO_2颗粒之间的颈部生长的局限性预计将负责增加潜在的屏障高度，并提高敏感性对H_2，CH_4和C_3H__8的敏感性特性。