Basic Research on Oxynitride Glasses.

Loehman, Ronald E.

doi:10.21236/ada118925

Cited by 6 publications

(2 citation statements)

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“…The 15 weight percent samples were nearly all crystalline and microhardness values were relatively low. These data correlate well with previous findings[12,25,26] and support the theory that the substitution of nitrogen for oxygen in the glass structure increases the number of bridging bonds in the glass network, causing greater stiffness. Microhardness data as a function of nitrogen content are displayed inFigure 9.…”

supporting

confidence: 91%

“…In the • oxynitride glass structures, nitrogen in the trivalent state is thought to replace divalent oxygen. The resultant nitrogen bridging forms three bonds, potentially increasing the crosslinking in the glass network [12]. It was shown that as nitrogen content increases glass properties improve; -specifically, increased viscosity, higher glass transition temperature, increased hardness, and decreased coefficient of thermal expansion [13].…”

Section: Introductionmentioning

confidence: 99%

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Joining of silicon nitrides using oxynitride glasses

O'Brien¹

1993

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This report presents a study conducted for the U. $. Department of the Interior's Bureau of Mines on commercial silicon nitrides that were successfully joined using oxynitride glasses. Sintered silicon nitride was joined by either closed or glass-filled joints. Glass-filled joints were successfully used on hot-pressed silicon nitrides and were comparable in fast fracture strength to the unjoined silicon nitrides up to approximately 1000°C. Above that temperature, strengths decreased rapidly and glass flow failure began. The study observed that time-dependent failure currently limits the service temperatures of glass-filled joints. Creep failure occurred in excess of 10000C. Between 900 and 1000°C, slow crack growth failure was observed. Cavitation (or viscous deformation) was the rate-controlling mechanism of slow crack growth.

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supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%