Reaction sintering of shock-compressed Ti + C powder mixtures
- Georgia Tech, Atlanta, GA (United States). School of Materials Science and Engineering
- New Mexico Tech, Socorro, NM (United States). Dept. of Materials and Metallurgical Engineering
Shock compression was used to make dense compacts of Ti and C elemental powder mixtures for subsequent reaction sintering in near-net form. The reaction sintering experiments were performed in an induction-heated hot press at temperatures below the melting point of Ti, with hold times of less than a few hours. The unique combination of defect states and packing characteristics introduced during shock compression results in significant enhancement in the solid-state chemical reactivity of the powder mixtures. Consequently, the reaction behavior of the powders is altered, and the reaction mechanism is dominated by solid-state diffusion, resulting in a microstructure reminiscent of solid-state processes. Reaction-sintered TiC{sub x} compacts, with bulk density in the range of 3.9 to 4.2 g/cm{sup 3} (80 to 85 pct TMD of TiC), were produced in near-net form. The compacts had a highly refined microstructure (<6-{micro}m grain size) and microhardness in the range of 1,360 to 1,934 KHN. In this article, reaction sintering mechanisms involving solid-state diffusion in Ti + C powder mixture compacts will be described, along with characteristics of the titanium carbide produced by the combined shock modification and reaction sintering approach.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 282226
- Journal Information:
- Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 7 Vol. 27; ISSN 0360-2133; ISSN MTTABN
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mechanistic processes influencing shock chemistry in powder mixtures of the Ti-Si, Ti-Al, and Ti-B systems
The abrasive wear of sintered titanium matrix-ceramic particle reinforced composites