Two indirect routes used to prepare densely sintered cordierite ceramics are examined. The routes involve sintering of lead borosilicate glass with cordierite glass and with cordierite ceramic, respectively. With the addition of lead borosilicate glass, both cordierite glass powders and ceramic powders can be densified at lower temperature. For cordierite ceramic with lead borosilicate glass, it is observed that Newtonian viscous flow is the predominant mechanism during the initial sintering stage and only densification of glass compacts takes place. However, crystallization of cordierite glass accompanied by the densification of glass compacts occurs during the sintering of cordierite glass with lead borosilicate glass.
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