Selective Infiltration of Fine Pores in Molecular Size by Use of CVI

利用 CVI 对分子大小的细孔进行选择性渗透

• 批准号: 06805063
• 负责人: SHIGENO Yoshihito
• 金额: $ 1.22万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06805063/
• 关键词: Methane; Pyrolysis; CVI; Activated charcoal; Coke; Graphite; Pore; Micropore; マイクロポア-; メソポア-; 耐酸化性; 窒素吸着法; 化学蒸着充填法; 微細気孔; 選択的充填; 炭化水素; 酸化反応; ASA; 気孔径分布

Chemical vapor infiltration is now being used to produce advanced materials for aerospace applications. It is also applicable to carbons to enhance the resisitance against oxidation. In the present study, methane pyrolysis was conducted for several kinds of carbons such as electrode-grade graphite electrode-grade carbon, coke and activated charcoal.The structural change of the fine pores : submicropore (diameter<1.5nm), micropore (d<2nm), mesopore (d<50nm), was investigated by use of nitrogen adsorption method. Those fine pores oreconsidered to have an important role for oxidation kinetics because in the case of inner burning, oxidation is considered mainly to occur in such fine pores due to their larger specific surface area comparing to those of macropores (d>50nm).The measured results indicates that the size of micropores decreases extremely for the infiltrated activated charcoal. Additionally, the opening rate of these pores are retarded to about 1/3 of the original sample during the oxidation. Therefore, it is concluded that the micro pores are attributed to the enhancement of oxidation resistance for activated charcoal as well as other carbons.The change of macropores measured by mercury porosimeter is compared with that of fine pores but is considered to have little effect on the enhancement of resistance.

化学蒸汽渗透现在被用于生产航空航天应用的先进材料。它也适用于碳，以提高抗氧化性。在本研究中，对电极级石墨、电极级碳、焦炭和活性炭等几种碳进行了甲烷热解。采用氮吸附法研究了亚微孔（直径<1.5nm）、微孔（直径<2nm）、中孔（直径<50nm）的结构变化。这些细孔被认为对氧化动力学具有重要作用，因为在内燃烧的情况下，氧化主要发生在这些细孔中，因为它们比大孔（d bbb50 nm）的比表面积更大。实验结果表明，活性炭渗透后，微孔尺寸大大减小。此外，在氧化过程中，这些孔隙的打开速度被延迟到原始样品的1/3左右。因此，我们认为微孔的形成是由于活性炭和其他碳的抗氧化能力增强所致。汞孔计测量的大孔变化与细孔的变化进行了比较，但认为对电阻的增强作用不大。

项目成果

Y.Shigeno, J.W.Evans and I.Yoh: "Structural Change of Micropores in Carabon by Chemical Vopor Infiltration of Carbon" Carmics International. vol.21. 445-449 (1995)

Y.Shigeno、J.W.Evans 和 I.Yoh：“碳的化学蒸气渗透导致 Carabon 中微孔的结构变化”Carmics International。

Y. Shigeno & J. W. Evans: "Enhancement of Mechanical Strength of Coke After Oxidation by Infiltrating Carbon in the Pores Vsing Methane Cracking" ISIJ. International. (投稿予定).

Y. Shigeno 和 J. W. Evans：“通过在孔隙中渗透碳与甲烷裂化提高焦炭的机械强度”ISIJ。

Y.Shigeno, J.W.Evans and I.Yoh: "Infiltration of Fine Pores in Activated Charcoal by Use of Mathane Pyrolysis" Materials Transactions JIM. (to be submitted).

Y.Shigeno、J.W.Evans 和 I.Yoh：“利用 Mathane 热解渗透活性炭中的细孔”Material Transactions JIM。

Y.Shigeno & J.W.Evans: "Enhancement of Mechanical Strength of Coke After Oxidation by Infiltrating Carbon in the Pores Using Methane Craking" ISIJ International. (投稿予定). メタン熱分解法による活性炭中微細気孔充填 (Y.Shigeno, J.W.Evans I Yoh)

Y.Shigeno 和 J.W.Evans：“利用甲烷裂化在孔隙中渗透碳来增强焦炭的机械强度”ISIJ International（待提交）。通过甲烷热解法填充活性炭中的细孔（Y.Shigeno）。 ，J.W.

Y. Shigeno, J. W. Evons I. Yoh: "メタン熱分解法による活性炭中微細気孔充填" 日本金属学会誌. (投稿予定).

Y. Shigeno，J. W. Evons I. Yoh：“通过甲烷热解法填充活性炭中的细孔”，日本金属学会杂志（待提交）。