Microstructure and indentation fracture toughness of mica glass ceramics Online publication date: Mon, 19-Jan-2009
by Abdullah Ozturk
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 3, No. 6, 2008
Abstract: Mica glass ceramics were produced through controlled crystallisation of a glass in the SiO2-Al2O3-CaO-MgO-K2O-MgF system. TiO2, P2O5 and ZrO2 were added individually as nucleating agents in the amount of 0.5 or 1.0 wt% of the glass. Crystalline phases were identified by X-ray diffraction. The effects of small amounts of various nucleating agents on the microstructure were determined by scanning electron microscopy. Microstructural analyses were supplemented with measurements of the Vickers microhardness and indentation fracture toughness. The amount and kind of nucleating agent did not change the number of crystalline phases present but had an influence on the shape and size of the crystals, and hence on the indentation fracture toughness of the mica glass ceramics. The values for the indentation fracture toughness for the mica glass ceramics containing 0.5 wt% of TiO2, P2O5 and ZrO2 were 1.69±0.09 MPa.m1/2, 1.74 ± 0.10 MPa.m1/2 and 1.77 ± 0.12 MPa.m1/2, respectively.
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Microstructure and Materials Properties (IJMMP):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email subs@inderscience.com
Our Blog 
Follow us on Twitter 
Visit us on Facebook