Reaction path in the formation of titanium diboride by a magnesium thermite process
- Georgia Inst. of Technology, Atlanta, GA (United States)
TiB{sub 2} was formed by a thermite reaction amongst Mg, amorphous B{sub 2}O{sub 3} and TiO{sub 2} powders. Mixtures consisting of 2Mg-TiO{sub 2}, 3Mg-B{sub 2}O{sub 3} and 5Mg-TiO{sub 2}-B{sub 2}O{sub 3} were heat treated using DTA and separately via ignition with a nichrome wire; product phases were identified using XRD. MgO and Ti were products from the first mixture reacted in argon, whereas an incomplete transformation forming Mg{sub 3}TiO{sub 4} occurred in air. For the second mixture, a reaction forming Mg{sub 3}B{sub 2}O{sup 6} occurred in air, but no reaction occurred in argon due to deficiency of oxygen. Minor amounts Of Mg{sub 3}B{sub 2}O{sub 6} and Mg{sub 2}TiO{sub 4} were detected in addition to the predicted product phases of MgO and TiB{sub 2} for the third mixture ignited both in air and argon. Based on available evidence, a path for this reaction was deduced; Mg particles in contact with TiO{sub 2} reacted to form Ti, which in turn reacted with B{sub 2}O{sub 3} to form TiB{sub 2}. TiB{sub 2} product particles from the reaction in argon had a more faceted appearance than those formed during the reaction in air. This was interpreted to be the result of glassy B{sub 2}O{sub 3} surface layer formation on TiB{sub 2} particles in air.
- OSTI ID:
- 175564
- Report Number(s):
- CONF-9501103-; TRN: 96:000419-0011
- Resource Relation:
- Conference: International symposium on advanced synthesis and processing, Cocoa Beach, FL (United States), 9-11 Jan 1995; Other Information: PBD: 1995; Related Information: Is Part Of Ceramic transactions: Advanced synthesis and processing of composites and advanced ceramics. Volume 56; Logan, K.V. [ed.]; PB: 388 p.
- Country of Publication:
- United States
- Language:
- English
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