DTIC ADA124290: Vitreous Enamel Damping Material Development pdf

DTIC ADA124290: Vitreous Enamel Damping Material Development

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This report describes the results of several experimental investigations pertaining to the effects of composition, viscosity, microstructure, and constraining layer on the damping properties of vitreous enamels. New vitreous enamels such as mixed alkali silicate, lead silicate, and two phase fluoride composition have been characterized. The mixed alkali and lead silicate compositions exhibits the characteristic, viscoelastic damping peak. The damping temperatures and the peak intensities are compositions dependent. The fluoride composition initially shows a typical vittreous enamel damping peak; however, after a heat treatment significant broadening of the damping peak is noted. It is believed that the broadening occurs due to a second phase which develops after the heat treatment. A relationship between the glass transition temperature and damping temperature have been developed. It has been determined that the viscosity in the damping range corresponds to approximately 1,000,000-10,000,000 poise. The viscosity range is favorable for processes like nucleation and crystallization.

Effects of nucleation and crystallization on the damping properties have been studied and analyzed for two compositions. The nucleation and crystallization have an adverse effect on the loss factor. Damping properties of three constrained layer systems have been evaluated and analyzed. The general effect of the constraining layer is to broaden the damping peak

• Creator/s: Defense Technical Information Center
• Date: 11/1/1982
• Year: 1982
• Book Topics/Themes: DTIC Archive, Kumar, Binod, DAYTON UNIV OH RESEARCH INST, *DAMPING, *GLASS, *SILICATES, *ENAMELS, TEMPERATURE, MICROSTRUCTURE, PHASE TRANSFORMATIONS, VISCOELASTICITY, GRAPHS, CRYSTALLIZATION, NUCLEATION, CHEMICAL COMPOSITION, TRANSITION TEMPERATURE, TABLES(DATA), LEAD COMPOUNDS, VISCOSITY, FLUORIDES, ALKALI METAL COMPOUNDS

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