-
- Maru Yoichi
- Department of Metallurgy, Facullty of Engineering, Kyoto University
-
- Kondo Yoshio
- Department of Metallurgy, Facullty of Engineering, Kyoto University
抄録
In order to measure the effective diffusivity of gas in a porous solid, the permeability was measured by using the pressure gradient technique in the pressure range between 10−3 mmHg and atmospheric pressure. The specimen employed was a disc-shaped porous metallic molybdenum pellet prepared by the thermal decomposition of molybdenite pellet at 1290°C in vacuum.<BR>Below the pressure of 1 mmHg, the measured permeability converges into constant values which are 1.98, 2.40 and 6.51 cm2/sec at 15°C for Ar, N2 and He gases, respectively. These values correspond to the effective Knudsen diffusivities of each gas and they satisfy the relationship that the effective Knudsen diffusivity is inversely proportional to the square root of molecular weight of diffusing gas. From these results, the mean pore radius is calculated at \bara=1.11 μ according to the random pore model of monodisperse pore distribution.<BR>The effective Knudsen diffusivity of diatomic sulfur gas at 1290°C in the same pellet was estimated at 3.60 cm2/sec. This value is in excellent coincidence with the estimated diffusivity of 3.52 cm2/sec which was calculated from the thermogravimetric data on the assumption that the diffusion of diatomic sulfur gas through the porous metallic molybdenum layer determines the overall rate of thermal decomposition of MoS2 pellet.
収録刊行物
-
- Transactions of the Japan Institute of Metals
-
Transactions of the Japan Institute of Metals 14 (4), 303-308, 1973
社団法人 日本金属学会
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1390001205116867200
-
- NII論文ID
- 130003485234
-
- COI
- 1:CAS:528:DyaE3sXltl2rtro%3D
-
- ISSN
- 24324701
- 00214434
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- Crossref
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可