Abstract
The ignition phenomena and the reaction mechanism of the self-propagating high-temperature synthesis reaction of titanium and carbon powders were experimentally investigated. When using coarse graphite powders (<325 mesh) as the carbon source, the ignition temperature ranged from 1650-1720‡C and was independent of the C/Ti ratio. The ignition temperature could be significantly lowered by using finer graphite powders (e.g. 1400‡C for <1 Μm powder). When using carbon black as the carbon source, the ignition temperature ranged from 1050-1475‡C and was dependent on the C/Ti ratio. The ignition was confirmed in this study to be controlled by the rate of the surface reaction between titanium and carbon which, in turn, was determined by the contact surface area between them. The fractured surfaces of the products showed two different types of morphology, i.e. groups of grains similar to sintered bodies and agglomerated fine particles. The relative quantities of the two types of morphology depended on the type of carbon used, the C/Ti ratio, the particle size of graphite and the density of the reactant pellet. Possible reaction mechanisms have been proposed on the basis of the experimental observations of the ignition phenomena and the product morphology.
| Original language | English |
|---|---|
| Pages (from-to) | 1487-1494 |
| Number of pages | 8 |
| Journal | Journal of Materials Science |
| Volume | 30 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1995 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
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Ignition phenomena and reaction mechanisms of the self-propagating high-temperature synthesis reaction in the Ti+C system. / Lee, Wei Chang; Chung, Shyan-Lung.
In: Journal of Materials Science, Vol. 30, No. 6, 01.01.1995, p. 1487-1494.Research output: Contribution to journal › Article
TY - JOUR
T1 - Ignition phenomena and reaction mechanisms of the self-propagating high-temperature synthesis reaction in the Ti+C system
AU - Lee, Wei Chang
AU - Chung, Shyan-Lung
PY - 1995/1/1
Y1 - 1995/1/1
N2 - The ignition phenomena and the reaction mechanism of the self-propagating high-temperature synthesis reaction of titanium and carbon powders were experimentally investigated. When using coarse graphite powders (<325 mesh) as the carbon source, the ignition temperature ranged from 1650-1720‡C and was independent of the C/Ti ratio. The ignition temperature could be significantly lowered by using finer graphite powders (e.g. 1400‡C for <1 Μm powder). When using carbon black as the carbon source, the ignition temperature ranged from 1050-1475‡C and was dependent on the C/Ti ratio. The ignition was confirmed in this study to be controlled by the rate of the surface reaction between titanium and carbon which, in turn, was determined by the contact surface area between them. The fractured surfaces of the products showed two different types of morphology, i.e. groups of grains similar to sintered bodies and agglomerated fine particles. The relative quantities of the two types of morphology depended on the type of carbon used, the C/Ti ratio, the particle size of graphite and the density of the reactant pellet. Possible reaction mechanisms have been proposed on the basis of the experimental observations of the ignition phenomena and the product morphology.
AB - The ignition phenomena and the reaction mechanism of the self-propagating high-temperature synthesis reaction of titanium and carbon powders were experimentally investigated. When using coarse graphite powders (<325 mesh) as the carbon source, the ignition temperature ranged from 1650-1720‡C and was independent of the C/Ti ratio. The ignition temperature could be significantly lowered by using finer graphite powders (e.g. 1400‡C for <1 Μm powder). When using carbon black as the carbon source, the ignition temperature ranged from 1050-1475‡C and was dependent on the C/Ti ratio. The ignition was confirmed in this study to be controlled by the rate of the surface reaction between titanium and carbon which, in turn, was determined by the contact surface area between them. The fractured surfaces of the products showed two different types of morphology, i.e. groups of grains similar to sintered bodies and agglomerated fine particles. The relative quantities of the two types of morphology depended on the type of carbon used, the C/Ti ratio, the particle size of graphite and the density of the reactant pellet. Possible reaction mechanisms have been proposed on the basis of the experimental observations of the ignition phenomena and the product morphology.
UR - http://www.scopus.com/inward/record.url?scp=0029274466&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0029274466&partnerID=8YFLogxK
U2 - 10.1007/BF00375253
DO - 10.1007/BF00375253
M3 - Article
AN - SCOPUS:0029274466
VL - 30
SP - 1487
EP - 1494
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 6
ER -