Subcritical crack growth in Y–Al–Si–O–N glass

Coon, Dennis N.

doi:10.1016/s0022-3093(98)00454-2

Cited by 9 publications

(9 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…de Graaf et al 44 found that n for a Y-Si-Al-O-N glass containing ∼7 at.% N was significantly higher (63) than for a Y-Si-Al-O glass (21), while Coon 43 reported, for a Y-Si-Al-O-N glass containing 18 at.% N, subcritical crack velocities in the range 5 × 10 −7 to 6 × 10 −5 m/s, obtained for stress intensities ranging from 0.675 to 0.686 MPa m 0.5 , respectively, and an even higher value of n (142). Optical properties of oxynitride glasses have been studied.…”

Section: Effects Of Glass Composition On Structure and Properties Of mentioning

confidence: 99%

See 1 more Smart Citation

Oxynitride glasses

Hampshire

2008

Journal of the European Ceramic Society

View full text Add to dashboard Cite

Oxynitride glasses are silicates and alumino-silicates in which nitrogen atoms substitute for oxygen in the glass network. They are present as intergranular films and at triple points within the microstructures of silicon nitride-based ceramics as a result of the cooling of liquid phases formed by reaction of sintering additives with the nitride and surface silica. Oxynitride glass chemistry and volume fractions determine the type of microstructure developed and hence the properties of silicon nitride and sialons. In particular, they affect strength and fracture toughness and the control of high temperature creep behaviour. The desire to understand the nature of these grain boundary phases has resulted in a number of investigations on oxynitride glass formation, structure, properties and crystallisation which have shown that they have higher glass transition temperatures, elastic moduli, viscosities and values of hardness and lower thermal expansion coefficients than the corresponding oxide glasses. This paper reviews the development of oxynitride glasses and outlines the effect of glass composition, especially nitrogen content and also cation ratios, on properties and relates this to structural features within the glass. Nucleation and crystallisation studies are also outlined.

show abstract

Section: Effects Of Glass Composition On Structure and Properties Of mentioning

confidence: 99%

“…The subcritical crack growth (SCG) resistance in water of Y-Si-Al-O-N glasses and their oxide equivalents have been reported using different loading configurations 43,44 but the same relationship between crack velocity, v, and the applied stress intensity,…”

Section: Effects Of Glass Composition On Structure and Properties Of mentioning

confidence: 99%

Oxynitride glasses

Hampshire

2008

Journal of the European Ceramic Society

View full text Add to dashboard Cite

show abstract

“…A related but quite remarkable effect is the fact that nitrogen additions clearly increase the resistance to slow crack growth of these glasses. Three studies of Si–Y–Al glasses reveal that the addition of nitrogen shifts the range of slow crack growth to significantly higher applied stress intensity ranges as compared with that for oxide glasses 83–85 . This can be attributed to a reduction in the fraction of threefold –Si–O ring structures when nitrogen is added, which while resistant to fracture in inert environments fail readily in the presence of water 86,87 .…”

Section: Other Propertiesmentioning

confidence: 99%

“…for oxide glasses. [83][84][85] This can be attributed to a reduction in the fraction of threefold -Si-O ring structures when nitrogen is added, which while resistant to fracture in inert environments fail readily in the presence of water. 86,87 The benefits are that the glasses containing nitrogen exhibit longer lifetimes under fixed applied stress conditions and/or more limited reductions in strength occur when stressing rates are reduced as compared with those for oxide glasses.…”

Section: Fracture Behavior Of Oxynitride Glassesmentioning

confidence: 99%

An Overview of the Structure and Properties of Silicon‐Based Oxynitride Glasses

Becher

Hampshire

Pomeroy

et al. 2011

Int J of Appl Glass Sci

102

View full text Add to dashboard Cite

The silicon oxynitride glasses take advantage of nitrogen bonding to attain high elastic modulus, increased softening temperatures and viscosities, greater slow crack growth resistance, and modest gains in fracture resistance. Of the oxynitride glasses, the Si–Y–Al‐based oxynitride glasses have been most extensively studied and a degree of success has been achieved in understanding how changes in glass composition affect structural parameters and their relationship with properties. More recent studies have focused on the Si–RE–Me oxynitride glasses, where Me is primarily Al or Mg and rare earth (RE) includes most of the lanthanide series elements. These glasses possess a range of elastic, thermal, mechanical, and optical properties, which can be correlated with the strength of the RE bond in terms of the cationic field strength. However, such correlations require knowledge of not only the RE valence state but also its coordination with the anions. Herein, the current state‐of‐the‐art understanding of the properties and structural parameters of oxynitride glasses and their interrelationships are reviewed.

show abstract

“…reveals a decrease of the crack growth velocity for a given stress intensity factor by over an order of magnitude in a Y–Si–Al–O–N glass in comparison to soda–lime–silica and borosilicate glasses in air, and an improvement of several orders of magnitude in water. Coon 198 studied the slow crack growth resistance of a Y–Si–Al–O–N glass by means of the double cantilever beam technique, and concluded to a several orders of magnitude smaller crack velocity at a given stress intensity factor for the oxynitride glass in comparison to a standard glass slide (likely a soda–lime–silica glass). Besides, the stress corrosion exponent (Paris law exponent) is typically above 150 for the oxynitride glass and below 150 for the oxide silicate glass.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Review: Elaboration, structure, and mechanical properties of oxynitride glasses

2022

View full text Add to dashboard Cite

Oxynitride glasses are glasses where threefold coordinated nitrogen atoms substitute for twofold oxygen ones, hence resulting in a larger interatomic crosslinking degree. Such glasses were first observed at the grain boundary in silicon nitride ceramics, where they govern the high-temperature behavior. Later, they were prepared as bulk materials and motivated numerous researches, thanks to their large viscosity, glass transition range, elastic moduli, hardness, and fracture toughness among inorganic and non-metallic glasses. In different chemical systems that were investigated, the synthesis routes and the sources for these exceptional mechanical properties are reviewed. Oxynitride glasses are not easy to process and suffer from the loss of transparency as nitrogen is incorporated over some critical content. Nevertheless, they are attractive "specialty" glasses in various niche areas, thanks to their large refractive index and dielectric constant, improved chemical durability, high softening point, etc., and majorly to their exceptional mechanical properties.

show abstract

Subcritical crack growth in Y–Al–Si–O–N glass

Cited by 9 publications

References 20 publications

Oxynitride glasses

Oxynitride glasses

An Overview of the Structure and Properties of Silicon‐Based Oxynitride Glasses

Review: Elaboration, structure, and mechanical properties of oxynitride glasses

Contact Info

Product

Resources

About