ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The crystallization behaviors and microstructural developments in the CaO-MgO- Al2O3-SiO2glass with Fe2O3, ZrO2 and F as additives were investigated by using scanning electron microscopy, X-raydiffraction and differential scanning calorimetry techniques. In the glass sample with 1.0wt% Fe2O3, onlysurface crystallization were observed, in which a three-layer compound surface containing the finedendrite, finer fibrous morphology and particle-shaped crystals was formed respectively from the nearfree surface to the inner region. The crystalline phases precipitated were anorthite and wollastonite at1000°C, and diopside at 1040°C. The addition of ZrO2 suppressed the nucleation and growth of thecrystalline phases. The addition of another 4.0wt% fluorine into the glass with a pair of 1.0wt% Fe2O3 and2.0wt% ZrO2 induced the bulk crystallization, the surface and bulk crystallizations were both observed at1040°C. At the surface, a three-layer morphology, which had similar morphology to the glass with1.0wt% Fe2O3 was formed. In the bulk region, the block-shaped crystalline phases were precipitatedhomogeneously in the residual glass
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1408.pdf
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