### Abstract

Thermodynamics of Zr deoxidation equilibrium in liquid iron has been studied at 1 873 K by using ZrO_{2}-9mol%MgO and mullite (3Al _{2}O_{3}·2SiO_{2}) electrolytes coupled with the quantitative alalysis of soluble Zr and insoluble Zr as ZrO_{2} by using a potentiostatic electronic extraction method. The soluble O content for a given soluble Zr content is lower than the previously reported values in the plot of soluble O vs. soluble Zr contents, and the oxygen activity for a given soluble Zr content is higher than the previously reported values. The free energy change of solid Zr dissolution into iron melt: Zr(S)=Zr. at 1873 K is obtained as ΔG°=-153±10kJ. The interaction coefficients for e_{O}^{Zr}, r_{O}^{Zr} and r_{O} ^{Zr,O} are estimated as -70±15, 901±131 and 10300±1500, respectively. However, the following interaction coefficients are represented by using a continuous function of logarithms of X, where X=[%sol.Zr]+5.7[%sol.O]+17.1 [%sol.Zr]·[%sol,O]/ (2[%sol.Zr]+5.7[%sol.O]) : e_{O}^{Zr}=-3.70-2020 ln X-20.7(ln X)^{2}+(ln X) ^{3} r_{O}^{Zr}=dV/dX={-0.33+1.87 ln X+3.01 (ln X) ^{2}}/X r_{O}^{Zr,O}≈11.4r_{O} ^{Zr}={-3.72+21.4 lnX+34.3(ln X)^{2}}/X

Original language | English |
---|---|

Pages (from-to) | 1175-1181 |

Number of pages | 7 |

Journal | Isij International |

Volume | 48 |

Issue number | 9 |

DOIs | |

Publication status | Published - 2008 Nov 28 |

### Keywords

- Electrolytes
- Interaction coefficients
- Mullite
- Thermodynamics
- Zr deoxidation

### ASJC Scopus subject areas

- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry

## Fingerprint Dive into the research topics of 'Thermodynamics of zirconium deoxidation equilibrium in liquid iron by EMF measurements'. Together they form a unique fingerprint.

## Cite this

*Isij International*,

*48*(9), 1175-1181. https://doi.org/10.2355/isijinternational.48.1175