Behavior of hot-pressed boron carbide at high temperatures. II. Strength

Gogotsi, G. A.; Gogotsi, Yu.G.; Kovylyaev, V. V.; Ostrovoi, D. Yu.; Ivas'kevich, V. Ya.

doi:10.1007/bf00795307

Cited by 3 publications

(2 citation statements)

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“…It is important to note that the specimens of ceramics oxidized at 1400°C had a graphite layer of up to 30 pm thickness under the B203 film [107]. If the oxidation process was accompanied by friction, the graphitized layer was formed at much lower temperatures.…”

Section: Corrosion By Hot Gasesmentioning

confidence: 99%

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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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Section: Corrosion By Hot Gasesmentioning

confidence: 99%

“…Aluminum-and silicon-doped materials often exhibit structural nonuniformity. They have areas of pure boron carbide, and silicon-and aluminum-doped areas [107].…”

Section: Corrosion By Hot Gasesmentioning

confidence: 99%