High‐Temperature Active Oxidation of Chemically Vapor‐Deposited Silicon Carbide in CO─CO<sub>2</sub> Atmosphere

Narushima, Takayuki; Goto, Takashi; Yokoyama, Yoshio; Iguchi, Yasutaka; Hirai, Toshio

doi:10.1111/j.1151-2916.1993.tb03975.x

Cited by 51 publications

(10 citation statements)

References 18 publications

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“…However, the results of Dawi, Ogura, and Rosner were obtained from experiments performed at very low oxygen pressures and represent a reaction‐limited regime. The experimentally observed dependence of oxidation transitions on bulk transport and flow rate may be indicative of deviation from diffusion‐limited equilibrium conditions, as demonstrated by Narushima …”

Section: Experimental Datamentioning

confidence: 69%

“…Mass loss rates in the active oxidation regime have been measured in several experiments, particularly those of Rosner and Allendorf, and Narushima et al . In the active regime, modeling results from Figure can be directly compared to the experimental data from Rosner and Allendorf .…”

Section: Resultsmentioning

confidence: 99%

“…The oxygen pressures and temperatures where both A‐P and P‐A oxidation transitions occur are compiled from various experiments in the literature. Figure summarizes the transition data for the SiC‐O 2 system from several experiments . Symbols denote experimental data, and lines denote theoretical/computed results, discussed in the following sections.…”

Section: Experimental Datamentioning

confidence: 99%

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Chemical equilibrium analysis of silicon carbide oxidation in oxygen and air

Chen

Boyd

2019

J Am Ceram Soc

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Due to their refractory nature and oxidation resistance, Ultra-High Temperature Ceramic materials, including silicon carbide, are of interest in hypersonic aerospace applications. To analyze the thermodynamic behavior of silicon carbide during transition between passive and active oxidation states, chemical equilibrium calculations are performed. The predicted oxygen pressures for passive-to-active transition show improved agreement up to an order of magnitude with experimental transition data in the literature, compared with Wagner's model. Both oxygen and air environments are examined, and a 3% difference in transition temperature is observed. Material response analysis demonstrates that a surface temperature jump occurs during thermal oxidation of silicon carbide, corresponding to passive-to-active transition.

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Section: Experimental Datamentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Datamentioning

confidence: 99%

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Chemical equilibrium analysis of silicon carbide oxidation in oxygen and air

Chen

Boyd

2019

J Am Ceram Soc

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“…Despite low oxygen partial pressures of, for example CO in equilibrium with carbon, we have passive oxidation of Sic up to x 1400°C in CO, because CO is a reactive and oxidizing gas species for Sic [52,85,86]! Consequently active corrosion in COX-environments is measured only at very high temperatures [87].…”

Section: Corrosion By Hot Gasesmentioning

confidence: 99%

Corrosion of Hard Materials

Nickel¹,

Gogotsi²

2000

Handbook of Ceramic Hard Materials

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Corrosion may be defined as the physical and chemical alteration of a material due to its interaction with the environment of interest. It must be emphasized that corrosion resistance is not a material property but a system property and real environments have a high variability in both chemical and physical boundary conditions.Corrosive alteration leads to a change in the desired original properties and so corrosion usually, but not exclusively, has adverse effects and causes a decrease in strength, toughness, hardness, and increases wear. There are many reasons for the degradation of properties by corrosion. Decrease of the cross-section carrying the load, pitting, stress induced by phase changes, and grain separation are some of the common features.Some hard materials, namely Sic and Si3N4, are designed to serve at high temperatures, where corrosion resistance is an essential feature. This is the reason why a large proportion of the ceramic literature on corrosion, including recent textbooks [ 1-51, deals with these materials.In order to react with the environment, the material must not be in equilibrium with it. The hard materials covered in this chapter are non-oxides and hence this condition is fulfilled for all of them in almost every application environment, including ambient air. The applicability of hard materials thus rests on the kinetics of the processes.Before discussing individual materials we will introduce important terms and concepts in corrosion like attack modes, media classes, location of attack, kinetics, and their parameters. We feel that this is necessary for understanding of the discussion of the materials, because there is no generally accepted standard procedure that allows us to compare the corrosion behavior of materials as easily as other properties like mechanical strength or hardness. Corrosive MediaThe compositional variability of environments is so vast that only very few attempts have been made to classify corrosion behavior from the point-of-view of the discrete environment at hand. A noteworthy exception is the Dechema handbook [6],in which valuable information may be found if the corrosive agent is simple and known (e.g. acetates, chlorine, steam). However, its main thrust is on the corrosion of metals.

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“…There are studies in the measurement of the active-topassive transition in H20/H2 (Kim and Readey, 1987) and CO2/CO (Narushima et al, 1993b). It has been shown that these are equivalent to the oxygen cases with H20 and CO2 acting as the primary oxidant, respectively (Opila and Jacobson, 1995).…”

Section: P_ (34) #O_rtmentioning

confidence: 99%