High‐Temperature Active Oxidation and Active‐to‐Passive Transition of Chemically Vapor‐Deposited Silicon Nitride in N2–O2 and Ar–O2 Atmospheres

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

doi:10.1111/j.1151-2916.1994.tb04607.x

Cited by 24 publications

(2 citation statements)

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“…3 Ogbuji, [4][5][6] Spear et al 7 and Du 8 have worked on the Si 3 N 4 oxidation, often in the passive domain, and some have established the possible existence of an intermediate oxynitride layer between Si 3 N 4 and SiO 2 . Vaughn and Maahs, 9 Sheehan, 10 Kim and Moorhead 11 and Narushima et al 12 have studied the transition between active oxidation occurring at high oxygen potentials and passive oxidation. Narushima et al 12 studied the oxidation of Si 3 N 4 prepared by chemical vapour deposition.…”

Section: Introductionmentioning

confidence: 99%

“…Vaughn and Maahs, 9 Sheehan, 10 Kim and Moorhead 11 and Narushima et al 12 have studied the transition between active oxidation occurring at high oxygen potentials and passive oxidation. Narushima et al 12 studied the oxidation of Si 3 N 4 prepared by chemical vapour deposition. Si 3 N 4 ceramic matrix composites reinforced by carbon fibres (C f /Si 3 N 4 ) have the potential to provide combinations of properties at high temperature, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Morphology and ablation mechanism of C_f/Si₃N₄composites ablated by oxyacetylene torch at 2200°C

Chen

Wan

Fang

et al. 2011

Corrosion Engineering, Science and Technology

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Si 3 N 4 ceramic matrix composites reinforced by carbon fibres (C f /Si 3 N 4 ) were prepared by low pressure chemical vapour infiltration at 1250uC using SiCl 4 and NH 3 as precursor. The as prepared C f /Si 3 N 4 composites were ablated to determine the mechanism of the ablation resistance and oxidisation resistance by oxyacetylene torch at 2200uC. The morphology and microstructure of the composites were examined by scanning electron microscopy. The phase compositions of the composites were confirmed by energy dispersive X-ray spectroscopy and Xray diffraction. The results indicated that the matrix of the C f /Si 3 N 4 composites was composed of the amorphous Si 3 N 4 and nanometre a-Si 3 N 4 . A central ablation region and a ring oxidisation region appeared on the surface of the as ablated C f /Si 3 N 4 composites. Sublimation of the Si 3 N 4 matrix and oxidation of the carbon fibres are the main ablation behaviours in the central region. Oxidation of the Si 3 N 4 matrix and deposition of SiO 2 particles are the main ablation behaviour in the ring region. A large number of SiO 2 liquid droplets produced during ablation were retained and formed spherical solid particles on the surface of the ring region after ablation. For the mismatch of the coefficient of thermal expansion of the carbon fibres and the Si 3 N 4 matrix, Si 3 N 4 matrix was cracked under the thermal impact of the oxyacetylene flame. With the passive oxidation of the as cracked surface, the continuous SiO 2 liquid was formed in the ring region. Subsequently, some residual Si 3 N 4 particles were covered by transparent SiO 2 layer to form an amber-like microstructure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphology and ablation mechanism of C_f/Si₃N₄composites ablated by oxyacetylene torch at 2200°C

Chen

Wan

Fang

et al. 2011

Corrosion Engineering, Science and Technology

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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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Corrosion of Ceramic Materials

Herrmann

Klemm

2014

Comprehensive Hard Materials

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High‐Temperature Active Oxidation and Active‐to‐Passive Transition of Chemically Vapor‐Deposited Silicon Nitride in N₂–O₂ and Ar–O₂ Atmospheres

Cited by 24 publications

References 20 publications

Morphology and ablation mechanism of C_f/Si₃N₄composites ablated by oxyacetylene torch at 2200°C

Morphology and ablation mechanism of C_f/Si₃N₄composites ablated by oxyacetylene torch at 2200°C

Corrosion of Hard Materials

Corrosion of Ceramic Materials

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High‐Temperature Active Oxidation and Active‐to‐Passive Transition of Chemically Vapor‐Deposited Silicon Nitride in N2–O2 and Ar–O2 Atmospheres

Cited by 24 publications

References 20 publications

Morphology and ablation mechanism of Cf/Si3N4composites ablated by oxyacetylene torch at 2200°C

Morphology and ablation mechanism of Cf/Si3N4composites ablated by oxyacetylene torch at 2200°C

Corrosion of Hard Materials

Corrosion of Ceramic Materials

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High‐Temperature Active Oxidation and Active‐to‐Passive Transition of Chemically Vapor‐Deposited Silicon Nitride in N₂–O₂ and Ar–O₂ Atmospheres

Morphology and ablation mechanism of C_f/Si₃N₄composites ablated by oxyacetylene torch at 2200°C

Morphology and ablation mechanism of C_f/Si₃N₄composites ablated by oxyacetylene torch at 2200°C