Development of Fine Porous Alumina Capillaries by a Dry-Wet Spinning Method(Synthesis and Processing,<Special Issue>Guest Editors Dedicated to Prof. Gunter Petzow: Modern Trends in Advanced Ceramics)

概要

論文の詳細を見る
The mechanical property and gas permeance of α-alumina (Al_2O_3) porous capillaries fabricated by a dry-wet spinning method were studied. Weibull analysis could be carried out on the fracture strength. Weibull modulus m and characteristic strength σ_0 decreased with an increasing porosity. The parameters of the capillaries agreed with the known value of the ordinary Al_2O_3 porous material. The helium (He) permeance for 77 capillaries at 298K was 1.8×10^<-5> mol m^<-2> s^<-1> Pa^<-1> and deviation of the He permeances were in the narrow range from 1.5×10^<-5> to 2.1×10^<-5>mol m^<-2> s^<-1> Pa^<-1>. Permeances were proportionate to the exponential of porosity, and the dominant permeation mechanism was considered to be the Knudsen diffusion. The γ-alumina-coated porous α-Al_2O_3 capillary showed high H_2 permeance of 9.73×10^<-6>mol m^<-2> s^<-1> Pa^<-1> at 873K. Therefore, the porous α-Al_2O_3 capillary in this study is a candidate for the support of hydrogen-permselective membrane at elevated temperatures.
2006-11-01