A-glass composition

The arrangement is then placed in a furnace, heated to 800°C, and the pressure decay test is repeated. The setup can be subjected to thermal cycles with pressure decay tests at room temperature and at 800°C. A good hermetic seal, however, will not show any pressure decay at a low pressure differential. The results of one series of tests using a glass composite material that has a glass transition temperature (Tg) of about 700°C, at 5 psi are shown in Figure 5.10. The combination of pressure and thermal cycle tests showed that the seal is capable of withstanding the pressure... 

Use a glass composition that phase separates and then leaches out (e.g., using an acid) one of the phases to produce porous glasses. 

Y. Sun and R. N. Singh, The Generation ofMultiple Matrix Cracking and Fibre-Matrix Interfacial Debonding in a Glass Composite, Acta Mater. 46, 1657-1667 (1998). 

A glass composition which was found particuiarly suitable for these applications [67] contained 52% SiOs, 30% Na20,15% CaO and <3% P2O5 (in mole %). Fiber bundles or tow of up to 5000 filaments were drawn from a melt of this composition and were interwoven with carbon fiber tow into a cylindrically braided sheath/core textile preform. The carbon fibers formed the core of the braided structure and provided the required stiffness and load support, and the bone bioactive fibers formed the sheath and functionality. 

The strength of pristine (flaw free) fibers is the intrinsic strength of a glass composition. 

When there are no flaws present, the measured strengths are called intrinsic. The strength of pristine fibers therefore provides the intrinsic strength of a glass composition. The intrinsic strength is denoted by S. Intrinsic strengths are measured when the following three conditions are satisfied ... 

In Fig. 14.5 a glass composite specimen can be seen loaded on an Instron 1185 tester during a three-point bending test. 

A Glass. A glass composition first used for making glass fibre, it was a container-glass type containing 10-15% alkali, and was soon superseded by special compositions. 

A glass composite panel with fire-retardant resin and wood core was developed for a coal mine Safe Room system as a rescue chamber for miners trapped underground [29]. In addition to using fire-retardant resins and intumescent mats integrated into the structural composite reinforcements, the coal mine Safe Room system will be coated with intumescent latex, a thin passive fire barrier to further enhance its fire-rating capacity. 

A patent has been issned for a glass composition in which 1.4 parts of beryUinm carbonate are fused with 4.3 parts of lithium carbonate and 18.5 parts of boric acid to produce a borate glass suitable for X-ray tube windows. This glass has a high coefficient of expansion, very high permeability to ultraviolet rays, is quite tough and easily worked. Note Inhalation of particles of any BeO-containing material should be avoided because of their toxicity. 

An example of a gelled ELSB assembled in a glass composite electrode for pH measurements is shown in Fig. 4.2.6 [67]. A torus-shaped ring of a gelled EL is held between the upper and lower plastic cylinders through two O-rings. The inner wall of the EL ring is in contact with an internal solution. Accurate determination of the pH of dilute sulfuric acid solutions has been successfully made with this composite... 

Fig. 4.2.6 Structure of a glass composite electrode equipped with a gelled ILSB torus ring [67], 1 electric cable 2 a plastic cap 5 cylindrical plastic body 4 internal solution of reference electrode 5 internal solution of glass electrode 6 and 6 Ag/AgCl electrodes 7 gelled ILSB 8 and S silicon O-ring 9 glass membrane 70 stem glass tube...

A glass composition having a composition between about 18 and ut 23 mole % Na20, about 3 to about 7 mole % CS2O, the balance being B2O3 is adaptable to match the thermal expansion coefficient of a beta"-Al20a solid electrolyte when used to bond and seal the solid-electrolyte to a porous support plate (22) in a sodium-sulfur battery (10). 

Deposition of a natural glassy material such as a glass composition. 

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