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- W126826786 abstract "The compositions on grain-boundary and transgranular fracture surfaces of TiB/sub 2/ ceramics were analyzed by using Auger electron spectroscopy (AES). The ceramics were densified by hot-pressing with and without use of Ni additives. Bulk chemical analyses indicated that the TiB/sub 2/ powders used in fabricating these ceramics contained up to 3 wt% O, about 600 ppm (wt) of Fe, and up to about 800 ppm (wt) of S, as well as Al, Ca, Cr, Cu, Si, W, and Zr at levels of 100 ppm (wt) or greater. When no Ni additive was employed, the AES results indicated that Fe, S, and O were concentrated at the TiB/sub 2/ grain boundaries. In addition, the Fe, S, and O were not strongly associated with each other, and their local concentrations varied substantially from facet to facet on the same grain. The transgranular TiB/sub 2/ fracture surfaces contained only Ti and B, indicating that the impurity elements were distributed in the TiB/sub 2/ such that they were below the detection limit of the spectrometer. The oxygen-bearing phase contained Ti and B. Ion sputtering to remove 50-70 atom layers resulted in removal of the S- and Fe-containing material from TiB/sub 2/ grain facets. Usemore » of the Ni sintering aid in the ceramics resulted in the absence of Fe from the grain boundaries and in a substantial reduction of the S and O concentrations. AES analysis of metallographic sections after sputtering confirmed the existence of a phase containing a high concentration of Ti and O. 6 references, 7 figures, 2 tables.« less" @default.
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- W126826786 date "1983-01-01" @default.
- W126826786 modified "2023-09-27" @default.
- W126826786 title "Auger electron spectroscopy analyses of fracture surfaces in TiB/sub 2/ ceramics" @default.
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