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Mocioiu, Ana-Maria; Mocioiu, Oana Cătălina
Manufacturing review (Ulis, France), 01/2021, Letnik: 8Journal Article
The objective of our investigations consists in the thermal characterization of SiO 2 -PbO-Na 2 O vitreous materials in order to establish their properties for applications mainly as sealants. In order to evaluate the vitreous material − metal adherence, the thermal expansion coefficients (α) from experimental and theoretic data were determined. The differential thermal analysis of studied materials give the information about temperatures characteristic to glass transition, crystallization and melting. Dilatometer measurements were performed in air atmosphere in order to establish thermal coefficients of the materials. Softening and flowing characteristic of the vitreous materials were established by heating microscope measurements. The difference between thermal expansion coefficient (α) of the vitreous materials (10.2 × 10 −6 K −1 and 17.6 × 10 −6 K −1 ) and thermal expansion coefficient of the steel substrate OL 38 (10.8 × 10 −6 K −1 ) is under 37%. This value is fit for a good adherence between materials.
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