A comparison of the microstructure and mechanical properties of two liquid phase sintered aluminas containing different molar ratios of calcia–silica sintering additives

Developing Interfacial Phase Diagrams for Applications in Activated Sintering and Beyond: Current Status and Future Directions

“…For SiC‐based ceramics, drying/crystallizing IGFs leads to increased creep resistance at the expense of fracture toughness . IGFs and other types of GB phases (such as monolayers, bilayers, and trilayers) can play critical roles in the erosive wear resistance of Al 2 O 3, the superplasticity of Y 2 O 3 ‐stabilized ZrO 2 , and embrittlement of metals such as W‐Ni, Mo‐Ni, Cu‐Bi, and Ni‐Bi as well as WC‐Co cermet composites . In functional materials, impurity‐based IGFs and presumably other GB phases (complexions) can critically affect the tunable conductivities for ruthenate based thick‐film resistors, non‐linear I‐V characteristics for ZnO‐Bi 2 O 3 ‐based varistors, thermal conductivity of AlN substrates, and critical currents of high T c superconductors .…”

Comment on “Effect of Interface Structure on the Microstructural Evolution of Ceramics”

“…Bae and Baik showed quite compellingly that the onset of AGG occurs in alumina when the concentration of glass‐forming dopants or impurities in the grain boundaries is above the level necessary to form an intergranular film 7,32 . Subsequent studies have verified this and shown intergranular films on the abnormal grain boundaries and none on normal grain boundaries 11–13,33,34 . Intergranular films may form preferentially on different interfaces based on the distribution of the dopant and the energies of different interfaces.…”

“…7,32 Subsequent studies have verified this and shown intergranular films on the abnormal grain boundaries and none on normal grain boundaries. [11][12][13]33,34 Intergranular films may form preferentially on different interfaces based on the distribution of the dopant and the energies of different interfaces. It has been shown that cations segregate preferentially to particular crystallographic orientations 35,36 and that certain grain boundaries may be more likely to form intergranular films than others.…”

Synergistic effect of α-Al2O3 and (NH4)3AlF6 co-doped seed on phase transformation, microstructure, and mechanical properties of nanocrystalline alumina abrasive

“…A sudden decrease in wear rate had been observed for the samples S4 and S6. This indicated the effect of character of the alumina crystal on the wear rate [29,30]. For abrasive wear, the wear rates increase significantly with increasing alumina mean crystal size [31,32].…”