Zirconia metering nozzle preparing method adding zirconium sol in two steps

Abstract

The invention provides a zirconia metering nozzle preparing method adding zirconium sol in two steps. The method includes steps of material mixing, compression moulding, drying, sintering, and vacuum soaking. The mixed materials comprise 20-50% by weight of partially-stable zirconia, 10-30% by weight of monoclinic zirconia, 30-40% by weight of monoclinic silicon-removed zirconium, 1-3% by weight of a stabilizing agent, and 3-5% by weight of a binding agent that including zirconia sol. In the subsequent vacuum soaking step, a sintered product is added into the zirconia sol and subjected to vacuumizing and soaking. According to the method, nanometer zirconia is introduced by a manner of adding the zirconium sol in two steps. The nanometer zirconia decomposed by utilization of the zirconium sol has functions of resisting high temperature, stress-induced transformation toughening and microcrack toughening, thus enhancing the washing resistance, corrosion resistance and thermal shock resistance of the zirconia metering nozzle, prolonging the service lifetime of the metering nozzle, and increasing the working efficiency of a continuous casting machine.

Description

technical field

[0001] The invention relates to the technical field of preparation of a device for controlling molten steel flow in a continuous casting tundish in the iron and steel metallurgical industry, in particular to a two-step preparation method for adding zirconium sol to toughen and strengthen a zirconium sizing nozzle. Background technique

[0002] The sizing nozzle is a functional device made of high-temperature structural ceramics installed at the bottom of the tundish for continuous casting. It plays the role of controlling the flow of molten steel. It must have excellent thermal shock resistance and corrosion resistance to ensure that molten steel can pass The diameter nozzle evenly and stably flows into the crystallizer, so as to ensure the normal progress of continuous casting. The reliable performance of the sizing nozzle is very important to provide high-quality molten steel for billet continuous casting machines and successful casting operations. It not o...

Examples

Embodiment 1

[0029] A two-step preparation method for adding zirconium sol to toughen and strengthen zirconium sizing nozzle, comprising 25% by weight of fused calcium oxide partially stabilized zirconia particles, 20% of fused calcium oxide partially stabilized zirconia fine powder, 35% of monoclinic desilication zirconium powder and 20% of monoclinic zirconia powder are used as raw materials, adding 1% of yttrium oxide as a stabilizer, and then adding 3% of the total weight of materials. Zirconium dioxide sol, A binder composed of dextrin and water, the ratio of each component in the binder is: 66% zirconia sol, 30% water, 4% dextrin, and the solid phase weight content of the zirconia sol is 6%.

[0030] Its preparation steps are as follows:

[0031] 1) Put all the raw materials into the mixer for dry mixing for 4 minutes, then add the binder mainly composed of zirconia sol and wet mix for 5 minutes;

[0032] 2) After the obtained mixture was trapped for 10 hours, it was machine-pressed...

Embodiment 2

[0041]A two-step preparation method for adding zirconium sol to toughen and strengthen zirconium sizing nozzle, which consists of 35% by weight of fused calcium oxide partially stabilized zirconia particles, 25% of fused calcium oxide partially stabilized zirconia fine powder, 30% monoclinic desilication zirconium powder and 10% monoclinic zirconia powder are used as raw materials, and heavy calcium carbonate and light calcium carbonate accounting for 2% of the total weight of raw materials are added as stabilizers. The ratio of each component in the stabilizer It is: 65% heavy calcium carbonate, 35% light calcium carbonate; then add a binder consisting of zirconia sol, phenolic resin, water, and starch accounting for 4% of the total weight of the material, and the proportion of each component in the binder It is: 50% zirconia sol, 2% phenolic resin, 40% water, 8% starch, and the solid phase weight content of zirconia sol is 12%.

[0042] Phenolic resin is an additive to promo...

Embodiment 3

[0049] A two-step preparation method for adding zirconium sol to toughen and strengthen zirconium sizing nozzle, comprising 45% by weight of fused calcium oxide partially stabilized zirconia particles, 10% of fused calcium oxide partially stabilized zirconia fine powder, 35% monoclinic desilication zirconium powder and 10% monoclinic zirconia powder are used as raw materials, and yttrium oxide, heavy calcium carbonate and light calcium carbonate are added as stabilizers accounting for 3% of the total weight of the raw materials. The ratio of the points is: 5% yttrium oxide, 45% heavy calcium carbonate, 50% light calcium carbonate; The proportion of each component in the zirconia sol is: 80% zirconia sol, 17% water, 3% pulp powder, and the solid phase weight content of the zirconia sol is 2%.

[0050] Its preparation steps are as follows:

[0051] 1) Put all the raw materials into the mixer and dry mix for 5 minutes, then add the binder mainly composed of zirconia sol and wet ...

technical field

[0001] The invention relates to the technical field of preparation of a device for controlling molten steel flow in a continuous casting tundish in the iron and steel metallurgical industry, in particular to a two-step preparation method for adding zirconium sol to toughen and strengthen a zirconium sizing nozzle. Background technique

[0002] The sizing nozzle is a functional device made of high-temperature structural ceramics installed at the bottom of the tundish for continuous casting. It plays the role of controlling the flow of molten steel. It must have excellent thermal shock resistance and corrosion resistance to ensure that molten steel can pass The diameter nozzle evenly and stably flows into the crystallizer, so as to ensure the normal progress of continuous casting. The reliable performance of the sizing nozzle is very important to provide high-quality molten steel for billet continuous casting machines and successful casting operations. It not o...

Examples

Embodiment 1

[0029] A two-step preparation method for adding zirconium sol to toughen and strengthen zirconium sizing nozzle, comprising 25% by weight of fused calcium oxide partially stabilized zirconia particles, 20% of fused calcium oxide partially stabilized zirconia fine powder, 35% of monoclinic desilication zirconium powder and 20% of monoclinic zirconia powder are used as raw materials, adding 1% of yttrium oxide as a stabilizer, and then adding 3% of the total weight of materials. Zirconium dioxide sol, A binder composed of dextrin and water, the ratio of each component in the binder is: 66% zirconia sol, 30% water, 4% dextrin, and the solid phase weight content of the zirconia sol is 6%.

[0030] Its preparation steps are as follows:

[0031] 1) Put all the raw materials into the mixer for dry mixing for 4 minutes, then add the binder mainly composed of zirconia sol and wet mix for 5 minutes;

[0032] 2) After the obtained mixture was trapped for 10 hours, it was machine-pressed...

Embodiment 2

[0041]A two-step preparation method for adding zirconium sol to toughen and strengthen zirconium sizing nozzle, which consists of 35% by weight of fused calcium oxide partially stabilized zirconia particles, 25% of fused calcium oxide partially stabilized zirconia fine powder, 30% monoclinic desilication zirconium powder and 10% monoclinic zirconia powder are used as raw materials, and heavy calcium carbonate and light calcium carbonate accounting for 2% of the total weight of raw materials are added as stabilizers. The ratio of each component in the stabilizer It is: 65% heavy calcium carbonate, 35% light calcium carbonate; then add a binder consisting of zirconia sol, phenolic resin, water, and starch accounting for 4% of the total weight of the material, and the proportion of each component in the binder It is: 50% zirconia sol, 2% phenolic resin, 40% water, 8% starch, and the solid phase weight content of zirconia sol is 12%.

[0042] Phenolic resin is an additive to promo...

Embodiment 3

[0049] A two-step preparation method for adding zirconium sol to toughen and strengthen zirconium sizing nozzle, comprising 45% by weight of fused calcium oxide partially stabilized zirconia particles, 10% of fused calcium oxide partially stabilized zirconia fine powder, 35% monoclinic desilication zirconium powder and 10% monoclinic zirconia powder are used as raw materials, and yttrium oxide, heavy calcium carbonate and light calcium carbonate are added as stabilizers accounting for 3% of the total weight of the raw materials. The ratio of the points is: 5% yttrium oxide, 45% heavy calcium carbonate, 50% light calcium carbonate; The proportion of each component in the zirconia sol is: 80% zirconia sol, 17% water, 3% pulp powder, and the solid phase weight content of the zirconia sol is 2%.

[0050] Its preparation steps are as follows:

[0051] 1) Put all the raw materials into the mixer and dry mix for 5 minutes, then add the binder mainly composed of zirconia sol and wet ...

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