Abstract
The optimum acid cleaning conditions for removing CaO formed by the reaction of Ca with Ti powder were investigated in this study. In this experiment, we used Ti powders composed of irregular polygonal Ti particles with average sizes of 125 mm and 250 pm. Ca granules were charged at 50% of the Ti mass into a deoxidation pot with Ti powder, and then the Ti powder with the Ca granules was deoxidized at 800 °C in a vacuum atmosphere of 5.0 & 104 torr. It was confirmed that subsequent acid cleaning with 10% HC1 for 5 minutes reduced the initial oxygen concentration of the 125 pm-sized Ti powder from 2,000 ppm to 1,105 ppm. In the case of the non-contact deoxidation using Ca vapor at 900 °C, it was established that the non-contact deoxidation effect was higher than the contact type under the optimum acid cleaning condition of 10% HC1 for 5 minutes. XRD and SEM analyses detected some Ca particles, and residual CaO on the Ti powder surface was confirmed without acid cleaning, but the acid cleaning process completely removed the residual CaO. It was also found that the deoxidation and acid cleaning decreased the c/a axial ratio of the Ti powder from 1.5885 to 1.5851.
| Original language | English |
|---|---|
| Pages (from-to) | 205-209 |
| Number of pages | 5 |
| Journal | Journal of Korean Institute of Metals and Materials |
| Volume | 56 |
| Issue number | 3 |
| DOIs | |
| State | Published - 2018.03 |
Keywords
- Acid cleaning
- Calcium
- Deoxidation
- Powder
- Titanium
Quacquarelli Symonds(QS) Subject Topics
- Materials Science
- Mathematics
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