Glass, mechanical properties silicate

Cements based on phytic add set more quickly than their glass polyalkenoate or dental silicate cement cormterparts, but have similar mechanical properties (Table 8.2). They are unique among add-base cements in being impervious to acid attack at pH = 2-7. Unfortunately, they share with the dental silicate cement the disadvantage of not adhering to dentine. They do bond to enamel but this is by micromechanical attachment - the cement etches enamel - and not by molecular bonding. Lack of adhesive property is a grave weakness in a modern dental or bone... 

Glass fibers are the most common reinforcing fiber due to their excellent combination of mechanical properties, dielectric properties, thermal stability and relatively low cost. As a result, there are many different types of silicate glass fibers, all with varying properties designed for various applications (see Table 1.32). The majority... 

The mechanical properties of silicate- based glasses have been extensively studied due to their widespread use as containers, reinforcing fibers, and optical fibers. Consequently, there is a wealth of information on the influence of many variables on the mechanical properties of these glasses. We shall concentrate on (a) composition and temperature effects on modulus and strength and (b) an important method of strength enhancement in glass fibers. 

Botkin P. Ya., 1970, Mekhanicheskie svoistva silikatnykh stekol (Mechanical Properties of Silicate Glasses), Izd. Nauka, Leningrad. 

The mechanical properties of the film are modified by doping. For instance, phosphorus atoms are introduced via conventional PSG (Phospo-silicate glass) sources or ion implantation. In-depth studies [4] revealed that incorporation of... 

The role of the fillers in composite resins is to reinforce their mechanical properties and provide a blended material whose overall properties make it suitable for the clinical repair of teeth. A limited range of materials has been used, with greater emphasis on variations in the particle size and size distribution than on chemical composition. Early materials were filed with powdered quartz, whereas modem composites are more likely to be filled with finely divided barium silicate or a radio-opaque silicate glass [8]. Filler loadings are typically of the order of 55% by volume, as they were in Bowen s original formulation [9]. 

Molot, V. (1993) The Effect of Composition on the Mechanical Properties of Aluminosilicate, Borosilicate, and Gallosilicate Glasses, M.S. Thesis, Alfred University. Hsieh, C. H., Jain, H., Miller, A. C., and Kamitsos, E. I. (1994) X-ray Photoelectron Spectroscopy of Al- and B-substituted Sodium Tri-silicate Glasses, J. Non-Cryst. Solid., 168, 247-253. 

E. Bernardo, G. Scarinci, S. Hreglich, Mechanical Properties of Metal-Particulate Lead-Silicate Glass Matrix Composites Obtained by Means of Powder Technology, J. Europ. Ceram. Soc. 23, 1819-1827 (2003). 

The thermal and mechanical properties of such glasses are directly determined by the chain structure. For example, the glass transition temperature of a sodium silicate glass with 49% SiOa is 420° C. If the Si02 content is increased to 70%, then silicon chains of the II kind with short side chains are formed. Because of branching, the glass transition temperature decreases to 3SS°C (see also Chapter 10). If the Si02 content is further increased to 92%, then many... 

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