Download PDF by S. Velumani and René Asomoza: Advances in Semiconducting Materials

By S. Velumani and René Asomoza

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Niihara. Reduction and sintering of a Nickel-DispersedAlumina composite and its properties. Journal of the American Ceramic Society, 80 (5) (1997) pp. 1139-48. F. C. Radford. Healing of surface cracks in polycristalline Al2O3. Journal of the American Ceramic Society, 53 (7) (1970) pp. 420-421. K. Gupta. Crack healing and strengthening of thermally shocked alumina. J. Am. Ceram. , 59 (1976) pp. 259– 262. [6] K. Ando, T. Ikeda, S. Sato, F. Yao, Y. Kobayasi . A preeliminary study on crack healing behavior of Si3N4/SiC composite ceramics.

Was achieved. The sintered cylindrical disk samples obtained after processing were sectioned along their longitudinal axis. One half of each sample was mounted in Bakelite and its surface prepared for microstructure examination, using standard S. Velumani and René Asomoza 23 metallographic techniques. Etching of the samples was carried out using a fresh solution of 10% vol. H2SeO4 (selenic acid) in ethanol for 10 seconds. The microstructure of the samples was then characterized using quantitative WDS chemical analysis via scanning electron microscope (SEM).

Phragmen constructed a hypothetical equilibrium diagram based on qualitative optical microscopy measurements [32]. The resultant equilibrium diagram establishes the occurrence of a so-called c-Al(Fe,Mn)Si phase, which is formed for compositions above 6 wt % Si, 15 wt % Mn, and 11 wt % Fe. Fig. 10 shows the equilibrium diagram constructed by this author where it is possible to observe an ample range of homogeneity between the c-AlMnSi and c-AlFeSi cubic phases, limiting the field of stability of the quaternary phase.

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