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Spodumene-nepheline glass-ceramics was prepared from Na 2 O–CaO–Al 2 O 3 –SiO 2 glass compositions. Addition of LiF changes the course of the reaction toward the formation of β-spodumene together with nepheline. The crystallization of β-spodumene strongly reduced the thermal expansion coefficient from 70, in the base sample, to 17, in that containing 6wt.% LiF×10 ...
A new process for ∼200μm thick multilayer dielectric films on aluminum was developed via chemically bonded composite sol–gel. The sol–gel process used alumina and chemical bonding used phosphoric acid and aluminum phosphates. An interlayer was introduced between the coatings and aluminum substrate to decrease the thermal expansion mismatch between the ceramic and the substrate. The dielectric breakdown...
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