Preparation of Apatite-Wollastonite-Phlogopite glass-ceramic composites by powder sintering method

An Apatite-Wollastonite-Phlogopite glass-ceramic composite, was developed by sintering and crystallization of the powdered glass. The non-isothermal and isothermal sintering kinetics were studied for this glass-ceramic. Hot-stage microscopy (HSM) measurements demonstrated that it is possible to sinter and crystallize this glass-ceramic with 80% relative density. The activation energy of sintering was analyzed using previously reported model of sintering and it was obtained Q=193.83 KjmolK-1. Also it was shown that the microstructure of sample is a function of particle size distribution.

Download Full-text

Low-Melting Glass-Ceramic Composites with Low Linear Thermal Expansion Coefficient for Radio-Electronics

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.756.313 ◽

2015 ◽

Vol 756 ◽

pp. 313-318 ◽

Cited By ~ 4

Author(s):

Valeriy M. Pogrebenkov ◽

Kirill S. Kostikov ◽

E.A. Sudarev ◽

A.V. Elistratova ◽

Ksenia S. Kamyshnaya ◽

...

Keyword(s):

Thermal Expansion ◽

Thermal Expansion Coefficient ◽

Expansion Coefficient ◽

Glass Ceramic ◽

Ceramic Composite ◽

Linear Thermal Expansion Coefficient ◽

Linear Thermal Expansion ◽

Ceramic Composites ◽

Radio Electronics ◽

Glass Ceramic Composite

Glass-ceramic composite materials based on lead-borate glass and eucryptite – a compound with a negative coefficient of linear thermal expansion (CTE), along with the conditions for their production are studied in this paper. Effects of the amount and granulometric composition of the eucryptite as well as time/temperature processing conditions on the change of the linear thermal expansion coefficient of the sintered samples are also examined.

Download Full-text

Investigation of CeTi2O6- and CaZrTi2O7-containing glass–ceramic composite materials

Canadian Journal of Chemistry ◽

10.1139/cjc-2016-0633 ◽

2017 ◽

Vol 95 (11) ◽

pp. 1110-1121 ◽

Cited By ~ 8

Author(s):

Elham Paknahad ◽

Andrew P. Grosvenor

Keyword(s):

Composite Materials ◽

Glass Ceramic ◽

Local Structure ◽

Glass Matrix ◽

Ceramic Composite ◽

Ceramic Composites ◽

X Ray ◽

Synthesis Conditions ◽

Ceramic Composite Materials ◽

Glass Ceramic Composite

Glass–ceramic composite materials are being investigated for numerous applications (i.e., textile, energy storage, nuclear waste immobilization applications, etc.) due to the chemical durability and flexibility of these materials. Borosilicate and Fe–Al–borosilicate glass–ceramic composites containing brannerite (CeTi2O6) or zirconolite (CaZrTi2O7) crystallites were synthesized at different annealing temperatures. The objective of this study was to understand the interaction of brannerite or zirconolite-type crystallites within the glass matrix and to investigate how the local structure of these composite materials changed with changing synthesis conditions. Powder X-ray diffraction (XRD) and Backscattered electron (BSE) microprobe images have been used to study how the ceramic crystallites dispersed in the glass matrix. X-ray absorption near edge spectroscopy (XANES) spectra were also collected from all glass–ceramic composite materials. Examination of Ti K-, Ce L3-, Zr K-, Si L2,3-, Fe K-, and Al L2,3-edge XANES spectra from the glass–ceramic composites have shown that the annealing temperature, glass composition, and the loading of the ceramic crystallites in the glass matrix can affect the local environment of the glass–ceramic composite materials. A comparison of the glass–ceramic composites containing brannerite or zirconolite crystallites has shown that similar changes in the long range and local structure of these composite materials occur when the synthesis conditions to form these materials or the composition are changed.

Download Full-text

A study of the electronic structure and structural stability of Gd2Ti2O7 based glass-ceramic composites

RSC Advances ◽

10.1039/c5ra10720b ◽

2015 ◽

Vol 5 (99) ◽

pp. 80939-80949 ◽

Cited By ~ 10

Author(s):

Esther Rani Aluri ◽

Andrew P. Grosvenor

Keyword(s):

Electronic Structure ◽

Composite Materials ◽

Radioactive Waste ◽

Structural Stability ◽

Nuclear Waste ◽

Glass Ceramic ◽

Ceramic Composite ◽

Ceramic Composites ◽

Ceramic Composite Materials ◽

Glass Ceramic Composite

Glass-ceramic composite materials have been investigated for nuclear waste sequestration applications due to their ability to incorporate large amounts of radioactive waste elements.

Download Full-text