Synthsis of nano-structured ceramics by electromagnetic-assisted processing

电磁辅助加工合成纳米结构陶瓷

• 批准号: 16360364
• 负责人: MAKINO Yukio
• 金额: $ 9.66万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360364/
• 关键词: millimeter-wave sintering; ytteribia-base aids; aluminum nitride; pulsed high current sintering (SPS); nano-structured single-phase antase; electromagnetically driving force; preferential orientation; high dense nano-structured alumina; ナノ構造アナターゼ

Electromagnetically-assisted effects on the materials characters in the consolidation of powder materials were investigated in the millimeter-wave and pulsed high current (or SPS) heating processes and it was tried to develop nano-structured ceramics with the two processes. The following results were obtained ;1) It was found that ytterbia-base sintering aids are very effective for low temperature rapid sintering of A1N and Si3N4. Especially, A1N with higher thermal conductivity than 200W/(m・K) was successfully synthesized in the conditions of one-order shorter sintering time and 200cC lower temperature than those in conventional method.2) In the millimeter-wave sintering of A1N arid Si3N4, it was found that the composition of sintering aid should be designed so as to correspond the composition of intergranular phase in the sintered A1N to eutectic one in the system of Al2O3-Yb2O3. Further, successful synthesis of the A1N with about 150W/(nr K) at 1500°C using a aid of CaO-Al2O3-Yb2O3 … More system shows high possibility of producing a cheep A1N.3) It was succeeded to produce dense nano-structured anatase with grain size less than 300nm by using pulsed high current heating (SFS) process. Further, z-axis directional preferential orientation can be generated by consolidating at a temperature below the temperature of anatase-rutile transition, and the degree of preferential orientation can be controlled by the change of current and pressure.4) Formation of solid solution between strontium and barium titanates by pulsed high current heating (SPS) method was detected at 200°C lower temperature than that in the conventional method, resulting in verification of the enhanced mass transfer under the pulsed high current filed.5) Dense nano-structured alumina with the grain size less than 300nm was successfully synthesized by sintering alumina nano-powder of 100nm at the low temperature (1150°C) and a short time (10 min) using pulsed high current heating (SPS) method. In the use of alumina nano-powder of 230nm, dense nano-structured alumina with the grain size less than 500nm could be also synthesized at 1200°C using the same method. Less

研究了毫米波和脉冲高电流（或SPS）加热过程中电磁辅助对粉末材料固结过程中材料特性的影响，并尝试用这两种过程开发纳米结构陶瓷，结果如下。得到；1)发现镱基烧结助剂对于AlN和Si3N4的低温快速烧结非常有效，特别是AlN的导热率比AlN高。在比传统方法缩短一数量级的烧结时间和低200cC的温度的条件下成功合成了200W/(m·K)的材料。2)在AlN和Si3N4的毫米波烧结中，发现组成烧结助剂的设计应使烧结 A1N 中晶间相的组成与系统中的共晶相相对应此外，在 CaO-Al2O3-Yb2O3 系统的帮助下，在 1500°C 下成功合成了约 150W/(nr K) 的 A1N，这表明生产廉价的 A1N 的可能性很高。3)通过使用脉冲高电流加热（SFS）工艺生产晶粒尺寸小于300nm的致密纳米结构锐钛矿进一步，z轴。在低于锐钛矿-金红石转变温度的温度下固结可以产生定向择优取向，择优取向的程度可以通过电流和压力的变化来控制。4)脉冲钛酸锶和钛酸钡之间形成固溶体高电流加热（SPS）方法在比传统方法低200°C的温度下进行检测，从而验证了脉冲高电流场下增强的传质。5）致密纳米结构采用脉冲强电流加热（SPS）方法，在低温（1150℃）、短时间（10min）下烧结100nm的氧化铝纳米粉体，成功合成了晶粒尺寸小于300nm的氧化铝。还可合成230nm的氧化铝纳米粉体、粒径小于500nm的致密纳米结构氧化铝1200°C使用相同的方法。

项目成果

SPS effect on solid solution formation between barium and strontium titanates

SPS 对钛酸钡和钛酸锶固溶体形成的影响

• 发表时间: 2007
• 期刊: J. Jpn. Soc. Powder Powder Metallurgy(粉体および粉末冶金) Vol.54, No.3
• 作者: Y.Makino;T.Tanaka;S.Yamada
• 通讯作者: S.Yamada

Properties and microstructure of aluminum nitride sintered by millimeter-wave heating

• DOI: 10.1016/j.jallcom.2004.12.103
• 发表时间: 2006-02
• 期刊: Journal of Alloys and Compounds
• 影响因子: 6.2
• 作者: T. Yoshioka;Y. Makino;S. Miyake;H. Mori

Characteristics of millimeter-wave heating and smart materials synthesis

毫米波加热与智能材料合成的特点

• 发表时间: 2007
• 期刊: ISIJ International Vol.47, No.4
• 作者: Y.Makino;M.sakaguchi;J.Terada;K.Akamatau;Y.Makino
• 通讯作者: Y.Makino

Consolidation of utrafine alumina powders with SPS method

SPS法固结超细氧化铝粉

• 发表时间: 2007
• 期刊: J. Jpn. Soc. Powder Powder Metallurgy(粉体および粉末冶金) Vol.54, No.4
• 作者: Y.Makino;M.sakaguchi;J.Terada;K.Akamatau
• 通讯作者: K.Akamatau

Dense nano-structured and preferentially-oriented anatase synthesized by pulsed high current heating

脉冲大电流加热合成致密纳米结构和择优取向锐钛矿

• 发表时间: 2005
• 期刊: J. Jpn. Soc. Powder Powder Metallurgy(粉体および粉末冶金) 52・11
• 作者: Y.Makino;T.Mori;H.Eguchi;T.Yoshioka;H.Saito;B.Kyoh;S.Miyake
• 通讯作者: S.Miyake