Synthesis of Al{sub 2}O{sub 3}-TiC and Al{sub 2}O{sub 3}-TiB{sub 2} composite powders by combustion method
- Hungarian Academy of Sciences, Budapest (Hungary). Research Lab. for Inorganic Chemistry
- Central South Univ. of Technology, Changsha (China). Dept. of Materials Science and Engineering
Fine {alpha}-Al{sub 2}O{sub 3}-TiC and {alpha}-Al{sub 2}O{sub 3}-TiB{sub 2} composite powders were synthesized by combustion reactions of the Al-TiO{sub 2}-C and Al-TiO{sub 2}-B{sub 2}O{sub 3} systems, respectively. The powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The powders were composed of {alpha}-Al{sub 2}O{sub 3} and TiC in the Al-TiO{sub 2}-C system and of {alpha}-Al{sub 2}O{sub 3} and TiB{sub 2} in the Al-TiO{sub 2}-B{sub 2}O{sub 3} system. In both cases, the composite powders as formed were very fine. Their mean particle size was about 1 {micro}m. However, the powders were susceptible for agglomeration, and clusters with a size of about 15 mm were formed. The size of agglomerates was very close to the mean particle size of the starting aluminum powder. Analysis of the SEM micrographs revealed that agglomeration of the powders decreased with an increased amount of alumina added as diluent. The latter effect was explained by the results of thermochemical calculations.
- OSTI ID:
- 218644
- Report Number(s):
- CONF-940468-; ISSN 1080-1278; TRN: IM9619%%365
- Journal Information:
- High Temperature and Materials Science, Vol. 34, Issue 1-3; Conference: 8. international conference on high temperature materials chemistry, Vienna (Austria), 4-9 Apr 1994; Other Information: PBD: Aug-Dec 1995
- Country of Publication:
- United States
- Language:
- English
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