caa a22 4500 388021497 CHVBK 20180307124925.0 cr unu---uuuuu 161130e199802 xx s 000 0 eng 10.1557/JMR.1998.0043 doi S0884291400042801 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0043 The initiation of spontaneous infiltration of alloys into carbon preforms in air [Elektronische Daten] It was found in a previous work that the Al-Si alloy could spontaneously infiltrate into carbon preforms in air. In this study, the initiation stage of the infiltration process was investigated in detail through two different infiltration experiments. In one experiment, carbon preforms were fully dipped into an alloy bath that was exposed to air, and in the other experiment a carbon preform was only partially dipped into an alloy bath that was protected with a flowing Ar or N2 gas. Experimental results have suggested that the initiation of infiltration is controlled by the pressure of oxidizing gases such as O2 or CO at the infiltration front and is not affected by the presence or absence of N2 gas. The critical pressure of oxidizing gases is estimated to be on the order of 10−4 atm for systems investigated in our experiments. An effective way to reduce the O2 or CO pressure is to flush a preform with nonoxidizing gases during or before infiltration, or to use an active metal to reduce the O2 pressure and thus the corresponding CO pressure. Copyright © Materials Research Society 1998 Yang X. F. Materials Research and Education Center, 201 Ross Hall, Auburn University, Auburn, Alabama 36849 Xi X. M. Materials Research and Education Center, 201 Ross Hall, Auburn University, Auburn, Alabama 36849 Xiao L. M. Materials Research and Education Center, 201 Ross Hall, Auburn University, Auburn, Alabama 36849 Journal of Materials Research Cambridge University Press 13/2(1998-02), 316-322 0884-2914 13:2<316 1998 13 JMR https://doi.org/10.1557/JMR.1998.0043 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0043 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yang X. F. Materials Research and Education Center, 201 Ross Hall, Auburn University, Auburn, Alabama 36849 NATIONALLICENCE 700 1- Xi X. M. Materials Research and Education Center, 201 Ross Hall, Auburn University, Auburn, Alabama 36849 NATIONALLICENCE 700 1- Xiao L. M. Materials Research and Education Center, 201 Ross Hall, Auburn University, Auburn, Alabama 36849 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/2(1998-02), 316-322 0884-2914 13:2<316 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge