Effect of CaO Addition on Compressive Deformation of Silicon Nitride Ceramic with Y‐Mg‐Si‐O‐N Glassy System. Issue 5 (10th January 2013)

• Record Type: Journal Article
• Authors: Wananuruksawong, Raayaa; Shinoda, Yutaka; Akatsu, Takashi; Wakai, Fumihiro
• Is Part Of: International journal of applied ceramic technology. Volume 10:Issue 5(2013:Sep./Oct.)
• Page Start: 756
• Page End: 763
• Publication Date: 2013-01-10
• Subjects: Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.12026
• Languages: English
• ISSNs: 1546-542X

Abstract

<abstract abstract-type="main" xml:lang="en" id="ijac12026-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Creep behavior of Si₃N₄ polycrystals containing Y₂O₃‐MgO‐SiO₂ glass phase (with and without Calcium oxide [CaO] additive) was studied by compression tests between 1500 and 1700°C. We studied the effect of CaO additive on flow stress, microstructural evolutions, and thermal stability of the intergranular glass phase during deformation. While the addition of CaO did not affect grain size, the flow stress decreased with the amount of CaO. This result suggested that the addition of CaO reduced the viscosity of intergranular glass phase. The addition of CaO further improved the thermal stability of the glass phase by suppressing the evaporation at elevated temperatures.</p> </abstract>