Reduction of Alumina: Effect of Silicon Compounds on Oxycarbide Behavior

Yokokawa, Harumi; Fujishige, Masao; Dokiya, Masayuki; Kameyama, Tetsuya; Ujiie, Seiichi; Fukuda, K.

doi:10.2320/matertrans1960.23.134

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…In this diagram, the stability areas of La2NiZrO6 and La4Ni2ZrO10 appear along with those of La2Zr2OT, NiO, La4Ni3010, La2NiO4, and La203. This means that La2NiO4 reacts with the ZrO2 component to form La4Ni2ZrO,0 or La2NiZrO6 as follows 2La2NiO4 + ZrO~ = La4Ni2ZrO10 [19] La4Ni30,0 + Zr02 = La4Ni2ZrO10 + NiO + 1/2 O2(g) [20] La4Ni2ZrO10 + ZrO2 = 2La2NiZrO6 [21] La2NiZrO6 reacts with the ZrO2 component to form La2Zr207 and NiO.…”

Section: Utilization Of Chemical Potentials Of Metallic Elementsmentioning

confidence: 99%

“…Since the manganese dissolution and the lanthanum nonstoichiometry of LaMnO3 were not included in constructing Fig. 5, the phase equilibria between the nonstoichiometric La,MnO3 and the ZrO2-based cubic solutions were calculated using the CTC/SOLGASMIX program (20,21). The therm0dyanmic data used are listed in Tables II and Table III; the lanthanum nonstoiciometry (7) was represented in terms of the association solution model ( 22) so as to reproduce the thermogravimetric results of La0.gMnO3 (23), and the ZrO2-YO1.5-MnO~-LaO,.5 solid solution (24) was represented in terms of the subregular solution model given by Redlich-Kister-Maggianu equation (25).…”

Section: Manganese Dissolution Vs La2zr207 Formation In Laymnojysz Co...mentioning

confidence: 99%

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Thermodynamic Analysis of Reaction Profiles Between LaMO3 ( M = Ni , Co , Mn ) and ZrO2

Yokokawa

Sakai

Kawada

et al. 1991

J. Electrochem. Soc.

150

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Chemical reactions of LaMO3(M=Ni, Co, Mn) and ZrO2 have been analyzed using chemical potential diagrams for the La-Zr-M-O systems under a condition of P(O2)= 1 bar. A log{a(M)/a(Zr)} vs. log{a(La)/a(Zr)} plot is appropriate for representing diffusion paths, because the layered arrangement of the reaction zone corresponds well to the geometrical configuration of stability polygons of reactants (LaMO~ and ZrO2) and products (La2Zr2OT, MO, La2ZrMO6, etc.). A complicated arrangement including a ternary perovskite phase, La2ZrNiO6, observed in the La2NiO~SZ couple can be represented by ABSTRACT Process control strategies have been developed for reactive ion etching of silicon and silicon dioxide in CF4/O2 and CF4/H2 plasmas. Four measured variables, four manipulated variables, and seven performance variables were considered for both gas mixtures. Relative gain array analysis and singular value decomposition were used to select manipulated/ process variable control loop pairings for feedback control and to evaluate potential difficulties in control system perform-

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Section: Utilization Of Chemical Potentials Of Metallic Elementsmentioning

confidence: 99%

Section: Manganese Dissolution Vs La2zr207 Formation In Laymnojysz Co...mentioning

confidence: 99%

Thermodynamic Analysis of Reaction Profiles Between LaMO3 ( M = Ni , Co , Mn ) and ZrO2

Yokokawa

Sakai

Kawada

et al. 1991

J. Electrochem. Soc.

150

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“…19 Dickson and Sohn 2o carried out the carbothermal reduction of coal wastes under a nitrogen atmosphere to form AIN and SiC. The subsequent selective leaching of AIN with a caustic solution yielded a sodium aluminate solution.…”

Section: Solid-solid Reactions (Carbothermic Reduction)mentioning

confidence: 99%

Developments in Physical Chemistry and Basic Principles of Extractive and Process Metallurgy in 1983

Sohn¹

1984

JOM

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“…(1) Lowering the volatilization of aluminum component to avoid the bridge formation and to obtain a high aluminum yield; (2) Maintaining the fluidity of the produced metals and of the unreduced oxide/carbide melts in the vicinity of the furnace hearth; (3) Protecting the produced metals from being reoxidized in the vicinity of the race way.…”

Section: Introductionmentioning

confidence: 99%

Volatilization of Aluminum Oxycarbides and of Alumina with Carbon in Reduction of Alumina

et al. 1984

Self Cite

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The volatilization in the A1-O-C(-Si-Fe) system have been investigated mainly by thermal gravimetry in vacuum for four cases; (1) aluminum oxycarbides, (2) mixtures of alumina and carbon with and without additives (iron oxide, silicon nitride and silicon carbide), (3) mixtures of alumina and aluminum carbide or silicon carbide and (4) mixtures of alumina, silica (mullite), iron oxide and carbon. A12OC evaporated essentially congruently, whereas A14O4C evaporated incongruently; a -A12O3 was formed in addition to vapors. The volatilization reaction between alumina and carbon was found to be enhanced remarkably when iron was added, unchanged by SiC addition and prevented slightly in the presence of Si3N4. The mixtures of alumina and carbide volatilized at lower temperatures than did those of alumina and carbon. These features are discussed in terms of the equilibrium pressure in the light of previous results of reaction experiments focussed upon the oxycarbide formation.

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Reduction of Alumina: Effect of Silicon Compounds on Oxycarbide Behavior

Cited by 8 publications

References 17 publications

Thermodynamic Analysis of Reaction Profiles Between LaMO3 ( M = Ni , Co , Mn ) and ZrO2

Thermodynamic Analysis of Reaction Profiles Between LaMO3 ( M = Ni , Co , Mn ) and ZrO2

Developments in Physical Chemistry and Basic Principles of Extractive and Process Metallurgy in 1983

Volatilization of Aluminum Oxycarbides and of Alumina with Carbon in Reduction of Alumina

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