The properties of mullite are governed by the starting materials used and the preparation technique. Reaction-sintered mullite prepared from mechanically blended powders typically exhibit low fracture toughness (1–2 MPa m-1/2) and low strength 200 MPa) because of the occurrence of amorphous grain boundary phases. On the other hand, gelation routes yield thoroughly mixed sub-micrometer particles that can be hot-pressed or sintered to make single-phase materials with excellent mechanical properties.
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