Preparation method for sizing nozzle used for continuous casting
A sizing nozzle and continuous casting technology, applied in the field of iron and steel metallurgy, can solve the problems of short service life, bursting, different service life, etc., and achieve the effect of improving service life, prolonging service life and small diameter expansion of the nozzle.
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Embodiment 1
[0019] A method for preparing a sizing nozzle for continuous casting, the raw material of the sizing nozzle is composed of the following components in terms of weight fraction: 26 parts of 0.5-5 μm monoclinic zirconia, 42 parts of 6 μm-25 μm monoclinic zirconia, 26- 16 parts of 60μm monoclinic zirconia, 8 parts of magnesia stabilized zirconia, ZrO 2 -Al 2 o 3 4 parts of composite material, described preparation method comprises the steps:
[0020] 1) ZrO 2 -Al 2 o 3 Composite material preparation: get ZrOCl by weight percentage 2 .8H 2 O:Al(NO 3 ) 3 .9H 2 O=90:10, prepare mother liquor, mother liquor concentration 1.0Mol / L, add the dispersant of 1.2% of material gross weight, NH 4 OH is positively titrated, stirred to pH=7-10, and the composite gel is prepared; the composite gel is aged for 18 hours, vacuum-filtered at 0.095MPa, washed with deionized water until silver nitrate cannot detect Cl - Then react at 500°C for 2h, the temperature rises to 700°C, react for 1...
Embodiment 2
[0025] A method for preparing a sizing nozzle for continuous casting. The raw materials of the sizing nozzle are composed of the following components in terms of weight fractions: 28 parts of 0.5-5 μm monoclinic zirconia, 38 parts of 6-25 μm monoclinic zirconia, 26- 18 parts of 60μm monoclinic zirconia, 6 parts of magnesia stabilized zirconia, ZrO 2 -Al 2 o 3 6 parts of composite material, described preparation method comprises the steps:
[0026] 1) ZrO 2 -Al 2 o 3 Composite material preparation: get ZrOCl by weight percentage 2 .8H 2 O:Al(NO 3 ) 3 .9H 2 O=90:10, prepare mother liquor, mother liquor concentration 2.0Mol / L, add the dispersant of 1.2% of material gross weight, NH 4 OH is positively titrated, stirred to pH=7-10, and the composite gel is prepared; the composite gel is aged for 24 hours, vacuum-filtered at 0.095MPa, washed with deionized water until silver nitrate cannot detect Cl - Then react at 500°C for 2h, the temperature rises to 700°C, react for 1...
Embodiment 3
[0031] A method for preparing a sizing nozzle for continuous casting. The raw materials of the sizing nozzle are composed of the following components in terms of weight fractions: 27 parts of 0.5-5 μm monoclinic zirconia, 40 parts of 6-25 μm monoclinic zirconia, 26- 17 parts of 60μm monoclinic zirconia, 7 parts of magnesia stabilized zirconia, ZrO 2 -Al 2 o 3 5 parts of composite material, described preparation method comprises the steps:
[0032] 1) ZrO 2 -Al 2 o 3 Composite material preparation: get ZrOCl by weight percentage 2 .8H 2 O:Al(NO 3 ) 3 .9H 2 O=90:10, prepare mother liquor, mother liquor concentration 1.5Mol / L, add the dispersant of material gross weight 1.2%, NH 4 OH is positively titrated, stirred to pH = 7-10, and the composite gel is prepared; the composite gel is aged for 21 hours, 0.095MPa vacuum suction filter, washed with deionized water until the silver nitrate cannot detect Cl - Then react at 500°C for 2h, the temperature rises to 700°C, react...
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