Development and Manufacturing of Maltilayr coated Ceramic-Composite Particles.

Maltilayr 涂层陶瓷复合颗粒的开发和制造。

• 批准号: 07555203
• 负责人: SHINOZAKI Kazuo
• 金额: $ 8.45万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555203/
• 关键词: Coating; Ceramic Particle; Spray Pyrolysis; Composite Ceramics

The ultra-fine composite particles with multilayr coating of different compounds were investigated. Two types of approaches were applied. (1) Special surfactant containing with the target element in the molecular structure was adsorbed on the surface of the ceramic particle to realize the homogeneous coating and dispersion. (2) Liquid particles are formed by the ultrasonic nebulization of mixed solution of the element for forming particle and for the coating, dried and decomposed. During this reaction, formed particle was covered with different element.(1) Titanium tri-iso-stearoil iso-propoxide (TTI) was selected as a model surfactant. TTI was adsorbed on the surface of yttria stabilized zirconia (YSZ) particle to make homogeneous coating of Ti on its surface. YSZ with TTI were well dispersed in decane as a primary particle. Centrifugal force was applied to make ultra-fine particle films with homogeneously distributed Ti. Element analysis revealed the overall composition are well agreed with predicted value from adsorption isotherm.(2) Pd fine particles coated with Ca compound and SiO_2 ultra-fine particle were selected as a model material of the ultrasonic nebulization approach. Pd (NO_3)_2 was most suitable starting material to make dense and homogeneous particle under controlling the particle size by the hydrolysis reaction simultaneously occurred during drying. Adding the 55 ppm-1wt% of Ca (NO_3)_2 solution to the Pd starting solution, Ca compounds deposited on the surface of the formed Pd metal particle. This coating layr protected the Pd particle from oxidation during heating.Colloidal SiO_2 particle was also added into starting solution. At drying stage SiO_2 particles were homogeneously distributed in the particle that is PdO by the thermodynamic reason. However, SiO_2 particles migrated from inside of the Pd particle to the surface during decomposition of the PdO to Pd. Pd particle was covered with SiO_2 on the surface.

研究了不同化合物多层包覆的超细复合粒子。采用了两种方法。(1)将分子结构中含有目标元素的特殊表面活性剂吸附在陶瓷颗粒表面，实现陶瓷颗粒的均匀包覆和分散。(2)通过超声波雾化颗粒形成元素和涂层元素的混合溶液形成液体颗粒，干燥并分解。在这个反应过程中，形成的颗粒被不同的元素所覆盖。(1)选择三异硬脂油异丙醇钛（TTI）作为模型表面活性剂。将钛酸丁酯（TTI）吸附在氧化钇稳定的氧化锆（YSZ）颗粒表面，使其表面均匀包覆钛。具有TTI的YSZ作为初级粒子在癸烷中分散良好。利用离心力制备了Ti分布均匀的超细颗粒薄膜。元素分析结果表明，吸附等温线预测值与元素分析结果吻合较好. (2)以钙化合物包覆的钯微粒和SiO_2超细微粒为模型材料，研究了超声雾化法的雾化机理。以Pd（NO_3）_2为起始原料，在干燥过程中同时发生水解反应，控制颗粒尺寸，制备出致密、均匀的颗粒是最合适的。将55 ppm ~ 1wt%的Ca（NO_3）_2溶液加入到Pd起始溶液中，Ca化合物沉积在形成的Pd金属颗粒表面。该包覆层保护了Pd粒子在加热过程中不被氧化，并向起始溶液中加入了胶体SiO_2粒子。在干燥阶段，由于热力学原因，SiO_2颗粒均匀地分布在PdO颗粒中。而在Pd O分解为Pd的过程中，SiO_2颗粒从Pd颗粒内部向表面迁移。Pd颗粒表面包覆有SiO_2。

项目成果

O.Sakurai,S.Che,K.Shinozaki and N.Mizutani: "Preparation of Spherical Metal and Metal Oxide Particles Using Ultrasonic Spray Pyrolysis." Proceedings of the 2nd International Meeting of Pacific Rim. CD-ROM (in printing). (1998)

O.Sakurai、S.Che、K.Shinozaki 和 N.Mizutani：“利用超声波喷雾热解制备球形金属和金属氧化物颗粒。”

S.Che, O.Sakurai, A.Saiki, K.Shinozaki and N.Mizutani: "Synthesis, Characterization and Application of Palladium-Based Nanocomposite Particles by Ultrasonic Spray Pyrolysis" Proceedings of 1996 Joint Japan-US Workshop on Nanoparticle Synthesis and Applica

S.Che、O.Sakurai、A.Saiki、K.Shinozaki 和 N.Mizutani：“超声喷雾热解法钯基纳米复合颗粒的合成、表征和应用”1996 年日美纳米颗粒合成与应用联合研讨会论文集

N.Kuge, K.Shinozaki, N.Mizutani: "Effect of Adsorption Amount and Behavior of Surfactant on the Agglomeration and Sintering" J.Mater.Sci.Soc.Japan. 33[4]. 173-174 (1996)

N.Kuge、K.Shinozaki、N.Mizutani：“表面活性剂的吸附量和行为对团聚和烧结的影响”J.Mater.Sci.Soc.Japan。

S.Che, O.Sakurai, H.Funakubo, K.Shinozaki and N.Mizutani: "Effect of Ca Modification on the Microstructure and Oxidation Property of Submicron Spherical Palladium Powders" J.Materials Research. 12[2]. 392-397 (1997)

S.Che、O.Sakurai、H.Funakubo、K.Shinozaki 和 N.Mizutani：“Ca 改性对亚微米球形钯粉微观结构和氧化性能的影响”J.Materials Research。

車,桜井,篠崎,水谷: "超音波噴霧熱分解法による球状Pd金属粉末の合成に及ぼす出発原料の影響" 日本セラミックス協会学術論文誌. 104・1. 38-43 (1996)

Kuruma、Sakurai、Shinozaki、Mizutani：“起始材料对超声波喷雾热解法合成球形Pd金属粉末的影响”日本陶瓷学会杂志104・1（1996）。