Synthesis of Al{sub 2}O{sub 3}-TiC and Al{sub 2}O{sub 3}-TiB{sub 2} composite powders by combustion method

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · High Temperature and Materials Science

OSTI ID:218644

Liang, S; Szepvoelgyi, J ^[1]; Zheng, Z ^[2]

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1. Hungarian Academy of Sciences, Budapest (Hungary). Research Lab. for Inorganic Chemistry
2. 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--
• Journal Information: High Temperature and Materials Science, Journal Name: High Temperature and Materials Science Journal Issue: 1-3 Vol. 34; ISSN 1080-1278; ISSN HTMSFP
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
ALUMINIUM OXIDES
BORON OXIDES
CARBON
COMBUSTION
COMPOSITE MATERIALS
PARTICLE SIZE
SOLID CLUSTERS
SYNTHESIS
TITANIUM BORIDES
TITANIUM CARBIDES
TITANIUM OXIDES