Thermodynamic evaluation of oxygen behavior in Ti powder deoxidized by Ca reductant

Sun Joong Kim; Jung Min Oh; Jae Won Lim

doi:10.1007/s12540-016-6111-9

Thermodynamic evaluation of oxygen behavior in Ti powder deoxidized by Ca reductant

Sun Joong Kim
, Jung Min Oh
, Jae Won Lim^*

^*Corresponding author for this work

Metallurgical System Engineering

Research output: Contribution to journal › Journal article › peer-review

26 Scopus citations

Abstract

To produce low oxygen Ti powder of less than 1000 mass ppm, commercial Ti powder was deoxidized by two types of Ca reductants: a solid Ca and a Ca vapor. Compared with the iso-oxygen partial pressure in the Ti-O binary phase diagram, the P_O2 in the raw Ti powder increased with temperature compared to the reduction reaction of Ca. Therefore, the O₂ content in the Ti powder decreased as the deoxidation temperature increased from 873 K, showing a local minima at 1273 K. The oxygen concentration at 1373 K was greater than that at 1273 K because the oxygen solubility of the Ti powder was increased by the equilibrium relation between Ca and CaO. On the basis of the thermodynamic assessment, the deoxidation of Ti powder can be improved by increasing the temperature and lowering the oxygen solubility with the saturation of CaO.

Original language	English
Pages (from-to)	658-662
Number of pages	5
Journal	Metals and Materials International
Volume	22
Issue number	4
DOIs	https://doi.org/10.1007/s12540-016-6111-9
State	Published - 2016.07.1

Keywords

calcium
deoxidation
metals
powder processing
titanium

Quacquarelli Symonds(QS) Subject Topics

Engineering - Mechanical
Materials Science
Physics & Astronomy

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10.1007/s12540-016-6111-9

Cite this

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title = "Thermodynamic evaluation of oxygen behavior in Ti powder deoxidized by Ca reductant",

abstract = "To produce low oxygen Ti powder of less than 1000 mass ppm, commercial Ti powder was deoxidized by two types of Ca reductants: a solid Ca and a Ca vapor. Compared with the iso-oxygen partial pressure in the Ti-O binary phase diagram, the PO2 in the raw Ti powder increased with temperature compared to the reduction reaction of Ca. Therefore, the O2 content in the Ti powder decreased as the deoxidation temperature increased from 873 K, showing a local minima at 1273 K. The oxygen concentration at 1373 K was greater than that at 1273 K because the oxygen solubility of the Ti powder was increased by the equilibrium relation between Ca and CaO. On the basis of the thermodynamic assessment, the deoxidation of Ti powder can be improved by increasing the temperature and lowering the oxygen solubility with the saturation of CaO.",

keywords = "calcium, deoxidation, metals, powder processing, titanium",

author = "Kim, \{Sun Joong\} and Oh, \{Jung Min\} and Lim, \{Jae Won\}",

note = "Publisher Copyright: {\textcopyright} 2016, The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.",

year = "2016",

month = jul,

day = "1",

doi = "10.1007/s12540-016-6111-9",

language = "English",

volume = "22",

pages = "658--662",

journal = "Metals and Materials International",

issn = "1225-9438",

number = "4",

}

TY - JOUR

T1 - Thermodynamic evaluation of oxygen behavior in Ti powder deoxidized by Ca reductant

AU - Kim, Sun Joong

AU - Oh, Jung Min

AU - Lim, Jae Won

PY - 2016/7/1

Y1 - 2016/7/1

N2 - To produce low oxygen Ti powder of less than 1000 mass ppm, commercial Ti powder was deoxidized by two types of Ca reductants: a solid Ca and a Ca vapor. Compared with the iso-oxygen partial pressure in the Ti-O binary phase diagram, the PO2 in the raw Ti powder increased with temperature compared to the reduction reaction of Ca. Therefore, the O2 content in the Ti powder decreased as the deoxidation temperature increased from 873 K, showing a local minima at 1273 K. The oxygen concentration at 1373 K was greater than that at 1273 K because the oxygen solubility of the Ti powder was increased by the equilibrium relation between Ca and CaO. On the basis of the thermodynamic assessment, the deoxidation of Ti powder can be improved by increasing the temperature and lowering the oxygen solubility with the saturation of CaO.

AB - To produce low oxygen Ti powder of less than 1000 mass ppm, commercial Ti powder was deoxidized by two types of Ca reductants: a solid Ca and a Ca vapor. Compared with the iso-oxygen partial pressure in the Ti-O binary phase diagram, the PO2 in the raw Ti powder increased with temperature compared to the reduction reaction of Ca. Therefore, the O2 content in the Ti powder decreased as the deoxidation temperature increased from 873 K, showing a local minima at 1273 K. The oxygen concentration at 1373 K was greater than that at 1273 K because the oxygen solubility of the Ti powder was increased by the equilibrium relation between Ca and CaO. On the basis of the thermodynamic assessment, the deoxidation of Ti powder can be improved by increasing the temperature and lowering the oxygen solubility with the saturation of CaO.

KW - calcium

KW - deoxidation

KW - metals

KW - powder processing

KW - titanium

UR - https://www.scopus.com/pages/publications/84978063285

U2 - 10.1007/s12540-016-6111-9

DO - 10.1007/s12540-016-6111-9

M3 - Journal article

AN - SCOPUS:84978063285

SN - 1225-9438

VL - 22

SP - 658

EP - 662

JO - Metals and Materials International

JF - Metals and Materials International

IS - 4

ER -

Thermodynamic evaluation of oxygen behavior in Ti powder deoxidized by Ca reductant

Abstract

Keywords

Quacquarelli Symonds(QS) Subject Topics

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