Alumina and zirconia dissolution into molten flux during continuous steel casting

➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạm

Loại tài liệu: PDF

Số trang: 136 Trang

Tài liệu: ✅ ĐÃ ĐƯỢC PHÊ DUYỆT

TẢI VỀ

Nội dung chi tiết: Alumina and zirconia dissolution into molten flux during continuous steel casting

Alumina and zirconia dissolution into molten flux during continuous steel casting

Thesis for the Degree of Doctor of EngineeringAlumina and Zirconia Dissolution into MoltenFlux during Continuous Steel CastingAnh-Hoa BuiDepartment of

Alumina and zirconia dissolution into molten flux during continuous steel casting f Materials Science and Metallurg}'The Graduate School38687The Graduate SchoolKyungpook National UniversityAlumina and Zirconia Dissolution into Molte

nFlux during Continuous Steel CastingAnh-Hoa BuiDepartment of Materials Science and Metallurgy The Graduate SchoolSupervised by Professor In-Sang Chun Alumina and zirconia dissolution into molten flux during continuous steel casting

gApproved as a qualified thesis of Anh-Hoa Bui foi the degree of Doctor of Engineering by the Evaluation Committee38687Chairman Prof. Seong-Hoon YiPro

Alumina and zirconia dissolution into molten flux during continuous steel casting

f. Byung-Jun YeProf. Ho-Sang SohnProf. In-Sang ChungProf. Hae-Geon LeeThe Graduate School Council, Kyungpook National UniversityAlumina and Zirconia D

Thesis for the Degree of Doctor of EngineeringAlumina and Zirconia Dissolution into MoltenFlux during Continuous Steel CastingAnh-Hoa BuiDepartment of

Alumina and zirconia dissolution into molten flux during continuous steel casting al UniversityDaegu, Korea(Supervised by Professor In-Sang C hung I(Abstract)Alumina and zirconia dissolution into molten flux during the continuous st

eel casting was investigated by employing the rotating cylinder method at I550-1600sc. The dissolution rate of alumina and zirconia was determined by Alumina and zirconia dissolution into molten flux during continuous steel casting

measuring weight loss of the rod. initial dipping area, and immersion time. Thermodynamic computations (FactSage* software! were done to design the mo

Alumina and zirconia dissolution into molten flux during continuous steel casting

ld fluxes and to ascertain the interaction between the oxides and rhe molten fluxes. Several industrial mold fluxes and zirconia refractory, which are

Thesis for the Degree of Doctor of EngineeringAlumina and Zirconia Dissolution into MoltenFlux during Continuous Steel CastingAnh-Hoa BuiDepartment of

Alumina and zirconia dissolution into molten flux during continuous steel casting ssolution IS controlled not only by the mass transter in the molten flux but also by the formation of intermediate compounds such as CaO-fiALOj. CaO-Z

AhO.i, and 2Ca() AlẤ)j-Si(); on the surface of the rods. Alumina concentration driving force, the nod rotation speed, temperature of molten flux, and Alumina and zirconia dissolution into molten flux during continuous steel casting

chemical compositions are important factors which affect the alumina dissolution process. The dissolution rate of ALOj was found to increase with addi

Alumina and zirconia dissolution into molten flux during continuous steel casting

tion of MgO* A thesis submitted to the Council of the Graduate School of Kyungpook NationalUniversity in partial fulfillment of the requirements for t

Thesis for the Degree of Doctor of EngineeringAlumina and Zirconia Dissolution into MoltenFlux during Continuous Steel CastingAnh-Hoa BuiDepartment of

Alumina and zirconia dissolution into molten flux during continuous steel casting ysical erosion of the rod surface by the solid 2CaOSiO; dispersed in the liquid was attributed to fast alumina dissolution. The dissolution rate of al

umina into the industrial mold fluxes was determined and compared to the other designed fluxes.Under this study, dissolution rate of the zirconia rod Alumina and zirconia dissolution into molten flux during continuous steel casting

was very slow in molten fluxes, but much higher in molten flux Fe-C alloy or in molten flux low carbon steel due to a strong dissolution at the flux-m

Alumina and zirconia dissolution into molten flux during continuous steel casting

etal interface. It was found that the dissolution rates increased with increasing rotation speed of the rod. presence of fluoride (F) or Na20 m the mo

Thesis for the Degree of Doctor of EngineeringAlumina and Zirconia Dissolution into MoltenFlux during Continuous Steel CastingAnh-Hoa BuiDepartment of

Alumina and zirconia dissolution into molten flux during continuous steel casting n flux. This cyclic process and Marangoni effect that was considered as the dominant factor accelerated the dissolution rate at the flux-metal interfa

ce. Zirconia dissolution into molten flux was speculated to be the rate-conuolling step in the dissolution process of zirconia rod. Observation by SEM Alumina and zirconia dissolution into molten flux during continuous steel casting

-EPMA of the rod surface after experiment revealed that the molten flux and the liquid metal, i.e Fe-C alloy or steel, did not penetrate inside the ro

Alumina and zirconia dissolution into molten flux during continuous steel casting

d. It was concluded that flux viscosity, compositions of mold flux, or and wettability’ between molten flux and SEN materials, ere are several factors

Thesis for the Degree of Doctor of EngineeringAlumina and Zirconia Dissolution into MoltenFlux during Continuous Steel CastingAnh-Hoa BuiDepartment of