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Liquid-phase sintering wetting

In liquid-phase sintering, densification and microstmcture development can be assessed on the basis of the liquid contact or wetting angle, ( ), fonned as a result of the interfacial energy balance at the solid-liquid-vapour intersection as defined by the Young equation ... [Pg.2771]

Theoretical considerations by Clarke and co-workers (Clarke, 1987 Clarke etal., 1993) show that an equilibrium film thickness arises from the competition between attractive dispersion forces determined by the dielectric properties of the grains and repulsive disjoining forces which can be steric forces and/ or double-layer forces. Wetting will occur when the solid-solid boundary energy, yb, is less than that of the wetted boundary, 2y, where y is the liquid-solid interfacial energy (Clarke, 1985), provided that there is a suitable source of liquid, for example as a consequence of liquid-phase sintering at high temperatures. [Pg.469]

During liquid-phase sintering, the compositions of the starting solids are such as to result in the formation of a liquid phase upon heating. The liquid formed has to have an appreciable solubility of the solid phase and wet the solid. In the next sections, the reasons these two requirements should be met and the origin of the forces at play during liquid-phase sintering are elucidated. [Pg.338]

Contact angle > 90° (Fig. 10.23c). In this case the liquid will bead up and push the plates apart. This simple experiment makes it clear why a wetting system is a necessary condition for liquid-phase sintering to occur. [Pg.339]

Liquid-phase sintering occurs most readily when the liquid completely wets the surfaces of the solid particles at the sintering temperature. The liquid in the narrow channels results in the development of a substantial capillary pressure, as illustrated in Figure 24.13. For submicrometer sizes, capillaries with diameters in the range of 0.1-1 pm develop pressures on the order of 7 MPa for silicate liquids. [Pg.438]

The capability of the liquid to wet and spread over the surface of the solid particle determines the effectiveness of liquid-phase sintering. The wetting capability of a liquid is dependent on its surface tension, i.e., lower the surface tension, the high the wetting capability the liquid has, which is usually characterized by a parameter, known as contact angle. [Pg.366]

Gessinge GH, Fischmei HF, Lukas HL (1973) Model for second-stage liquid-phase sintering with a partially wetting liquid. Acta MetaU 21 715-724... [Pg.393]

The wettability of a liquid on a substrate is an important property in a number of ceramic processes. With a decreased wetting angle, i.e. an increased wettability, densification is enhanced in liquid phase sintering and the bonding in brazing or soldering is improved. [Pg.20]


See other pages where Liquid-phase sintering wetting is mentioned: [Pg.232]    [Pg.232]    [Pg.2770]    [Pg.2771]    [Pg.312]    [Pg.302]    [Pg.197]    [Pg.302]    [Pg.4]    [Pg.201]    [Pg.599]    [Pg.98]    [Pg.30]    [Pg.102]    [Pg.387]    [Pg.388]    [Pg.338]    [Pg.354]    [Pg.2770]    [Pg.2771]    [Pg.598]    [Pg.339]    [Pg.433]    [Pg.70]    [Pg.204]    [Pg.842]    [Pg.845]    [Pg.845]    [Pg.896]    [Pg.915]    [Pg.920]    [Pg.363]    [Pg.33]    [Pg.201]    [Pg.237]    [Pg.239]    [Pg.251]    [Pg.11]    [Pg.182]    [Pg.257]    [Pg.813]    [Pg.622]   
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