Liquid metal infiltration of silicon based alloys into porous carbonaceous materials. Part II: Experimental verification of modelling approaches by infiltration of Si-Zr alloy into idealized microchannels

Liquid metal infiltration of silicon based alloys into porous carbonaceous materials. Part I: Modelling of channel filling and reaction phase formation

“…While the formalism can be applied to any sort of Si-X alloy with X a silicide former, we would like to concentrate on the Si-X system used in our experimental work [5,6], i.e. Si-Zr, in order to be able to get some numerical values.…”

“…It is the aim of the present paper to (i) provide general expressions for the adequate preform constitution to obtain fully dense, fully converted SiC/silicide solids in net shape by the LSI process and to (ii) develop an analytical framework to quantitatively predict accessible infiltration depth by spontaneous infiltration of silicon-rich alloys containing silicide formers. This is the first of three articles series in which we present the analytical models in the part-I, followed by part-II, which shows experimental verification of modelling approaches by infiltration of Si-Zr alloy into idealised microchannels [5], and part-III, which shows experimental verification of conversion products and infiltration depth by infiltration of Si-Zr alloy into carbonaceous and mix SiC/graphite preforms [6].…”

Liquid metal infiltration of silicon based alloys into porous carbonaceous materials Part-III: Experimental verification of conversion products and infiltration depth by infiltration of Si-Zr alloy into mixed SiC/graphite preforms

“…The experimental results obtained in the reactive flow of the Si-Zr alloy in a micron-sized single capillary channel of glassy carbon are presented in our previous work [24]. We observed that increasing the infiltration temperature to 1700 • C might increase the infiltration depth.…”

“…The banding of the Zr-rich phase observed in the cross-sections of SiC-C pre-forms infiltrated by the Si-Zr alloy may help in decoding the reactive infiltration process with binary alloys. In our previous work [24], where we studied the reactive flow of molten pure Si and Si-Zr alloy in a single micron-size capillary channel machined into glassy carbon, we found two distinct mechanisms, which could cause the…”

“…This paper is the third and last part on the study of liquid metal infiltration of silicon based alloys into porous carbonaceous materials. The main novelty in our approach stands in the validation procedure of the developed models [23], which went through infiltration experiments from ideal straight and curved channels [24] to the real porous preforms, with randomly tortuous channels, of this work.…”