Phase Equilibria in the Si-B-C-N System

Seifert, H. J.; Aldinger, Fritz

doi:10.1007/3-540-45613-9_1

Cited by 48 publications

(24 citation statements)

References 162 publications

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“…According to this approach the thermodynamic properties of the multi-component liquid solution could be expressed by taking into account the thermodynamic properties of the binary solutions (expressed by the interaction parameters meters of the four phase equilibrium where, in addition to the phases mentioned above, silicon boride (SiB 3 ) appears. The limit composition of the boron carbide phase that may be in equilibrium with the melt and SiC corresponds to ~B 6.5 C. This value is in good agreement with the composition of boron carbide derived from the reported data for ternary Si-B-C phase diagram [28] (Figure 5). According to the calculated diagrams ( Figure 6), the Me-Si alloys that are in equilibrium with B 4 C and SiC contain 11 at% Si for the B 4 C/Cu-Si, 10 at% Si for the B 4 C/Au-Si system, and 0.03 at% Si for the B 4 C/Sn-Si system, which reflect the departure from ideality (negative or positive) of the various liquid solutions.…”

Section: Thermodynamic Analysis Of the B-c-si And The B-c-si-me (Cu supporting

confidence: 89%

“…A calculated isothermal section of the Si-B-C system at 1400 K has been published by Seifert [28] (Figure 5). Over its high carbon content range, namely B x C with 4 6.6 x < < , boron carbide is in two-phase equilibrium with SiC or in three-phase equilibrium with Si and SiC.…”

Section: Thermodynamic Analysis Of the B-c-si And The B-c-si-me (Cu mentioning

confidence: 99%

“…Although the expres- Figure 5. Isothermal section of the ternary B-C-Si phase diagram at 1400 K [28].…”

Section: Thermodynamic Analysis Of the B-c-si And The B-c-si-me (Cu mentioning

confidence: 99%

“…Thus, the influence of these metals as solvents for Ti may be attributed to their effect on the respective activities of titanium, carbon, and boron in the liquid solutions. A detailed thermodynamic analysis was done in [28], which takes into account the condition in which TiC and TiB 2 could be formed.…”

Section: The Boronmentioning

confidence: 99%

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Experimental Study and Thermodynamic Analysis of High Temperature Interactions between Boron Carbide and Liquid Metals

Aizenshtein¹,

Froumin²,

Frage³

2014

ENG

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How to cite this paper: Aizenshtein, M., Froumin, N. and Frage, N. (2014) AbstractFabrication of MCCs (Metal Ceramic Composites) and ceramic brazing requires improved wetting properties are often absent in various ceramic/metals systems. This report summarizes a comprehensive study concerning the wetting properties of boron carbide in contact with non-reactive metals such as Cu, Au, Ag, and Sn. In order to improve wetting, three different reactive elements were added to the melts; Si, which has relatively high affinity to C, leads to SiC formation and changes the stoichiometric boron carbide composition (B4C) towards lower carbon content; Ti, which displays high affinity to B, leads to TiB2 formation and free carbon precipitation at the interface; and finally, Al, which forms borocarbide phases at the interface. It was found that Cu is unusual with respect to boron carbide compared the other non-reactive metals. The most important difference is its ability to dissolve ~25 at% of B, which makes B adequate as an additive to Cu in addition to Si, Ti, and Al. When boron was used as an alloying element, its effect on wetting behavior was attributed to altering the boron carbide composition in contact with boron-containing melts. It was concluded that the most important properties of boron carbide that affect wetting phenomena are the relatively low chemical stability and the existence of a wide composition range (B4C-B10C). The first property determines the possibility of boron carbide to react with liquid metals (by dissolution or formation of new phases) and the second offers an additional degree of freedom to improve its wetting by changing the composition of the ceramic phase.

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Section: Thermodynamic Analysis Of the B-c-si And The B-c-si-me (Cu supporting

confidence: 89%

Section: Thermodynamic Analysis Of the B-c-si And The B-c-si-me (Cu mentioning

confidence: 99%

“…Although the expres- Figure 5. Isothermal section of the ternary B-C-Si phase diagram at 1400 K [28].…”

Section: Thermodynamic Analysis Of the B-c-si And The B-c-si-me (Cu mentioning

confidence: 99%

Section: The Boronmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study and Thermodynamic Analysis of High Temperature Interactions between Boron Carbide and Liquid Metals

Aizenshtein¹,

Froumin²,

Frage³

2014

ENG

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show abstract

“…In most cases, pyrolysis above a given temperature leads to the formation of graphite-like domains. [6] However, such domains could not be detected with previous TEM and SEM studies in the case of SiBNC. [7] Using solid-state NMR spectroscopy in combination with a novel isotope labeling strategy, the presence of direct carbon-nitrogen bonds in the ceramic could be demonstrated for the first time.…”

mentioning

confidence: 77%