High-purity zirconium oxide refractory product with gradient function and preparation method thereof

Abstract

Belonging to the field of refractory materials, the invention mainly relates to a high-purity zirconium oxide refractory product with gradient function and a preparation method thereof. The product contains no less than 98 wt% of ZrO2 containing a stabilizer; and a forming method of a blank for the zirconium oxide refractory product is isostatic pressing, machine pressure or vibration pressing ramming molding. The zirconium oxide refractory product is characterized in that the blank of the zirconium oxide refractory product is in an overall cylindrical structure formed by a plurality of spliced arc plates; and the refractory product has specific inhomogeneous internal microstructure. The zirconium oxide refractory product provided by the invention has the characteristics of high working temperature, high chemical purity and gradient changes in porosity, volume density, linear expansion coefficient and thermal conductivity along a specific direction, and can significantly prolong the service life of the zirconium oxide product in an ultra high temperature environment.

Description

technical field

[0001] The invention belongs to the field of refractory materials, and mainly relates to a high-purity zirconia refractory product with gradient function and a preparation method. Background technique

[0002] Zirconia is an important refractory raw material with a melting point as high as 2715°C and excellent physical and chemical properties. In order to improve the performance of many refractories, a certain amount of zirconia is added, such as fused AZS bricks, Al 2 o 3 -ZrO 2 -C brick, Cr 2 o 3 -Al 2 o 3 -ZrO 2 bricks etc.

[0003] High-purity zirconia refractory products usually refer to refractory products with a zirconia (including stabilizer) content of more than 98%. It uses zirconia particles or zirconia hollow spheres, zirconia fine powder, stabilizers, binders, etc. as raw materials. The refractory products of the desired shape are prepared by casting, pouring, machine pressing, isostatic pressing, ramming and other molding methods. Comp...

Examples

Embodiment 1

[0022] Weigh fused calcium oxide partially stabilized zirconia particles (stabilization rate 75%), particle size greater than 0.5 mm and less than or equal to 1 mm1 kg, particle size greater than 0.35 mm and less than or equal to 0.5 mm 2.5 kg, particle size greater than 0.15 mm and less than or equal to 0.35 mm 3 kg , premixed in a high-speed kneader for 3 minutes, added 0.3 kg of phenolic resin alcohol solution, continued high-speed stirring for 5 minutes, and then added fused calcium oxide to it and partially stabilized zirconia fine powder (stabilization rate 75%) with a particle size greater than 30 μm is less than or equal to 150 μm 1.5 kg, fused calcium oxide partially stabilized zirconia powder D50 is 10 μm 1 kg, monoclinic zirconia powder D50 is 10 μm 1 kg, stirred at high speed for 10 minutes, sieved, dried, and then loaded into a steel In a mold composed of a core and a rubber sleeve, the green body is formed by isostatic pressing under a pressure of 150 MPa. The gre...

Embodiment 2

[0024] Weigh fused magnesia partially stabilized zirconia particles (stabilization rate: 80%), particle size greater than 0.5 mm and less than or equal to 1 mm 1 kg, particle size greater than 0.35 mm and less than or equal to 0.5 mm 2.5 kg, particle size greater than 0.15 mm and less than or equal to 0.35 mm 3 kg, Pre-mix in a high-speed kneader for 3 minutes, add 0.35 kg of phenolic resin alcohol solution, continue to stir at a high speed for 5 minutes, and then add fused magnesia partially stabilized zirconia fine powder (stabilization rate 80%) to it, with a particle size greater than 30 μm and less than Equal to 150 μm 2 kg, fused magnesia partially stabilized zirconia powder (stabilization rate 80%) particle size D50 is greater than 0.5 μm and less than or equal to 30 μm 1 kg, monoclinic zirconia powder D50 is 2 μm 0.5 kg, after stirring at high speed for 10 minutes, After sieving and drying, put it into a mold consisting of a steel core and a rubber sleeve, and press it ...

Embodiment 3

[0026] Weigh fused yttrium partially stabilized zirconia particles (stabilization rate: 85%), particle size greater than 0.5 mm and less than or equal to 1 mm 1 kg, particle size greater than 0.35 mm and less than or equal to 0.5 mm 2.5 kg, particle size greater than 0.15 mm and less than or equal to 0.35 mm 3 kg, Pre-mix in a high-speed kneader for 3 minutes, add 0.5 kg of phenolic resin alcohol solution, continue to stir at a high speed for 5 minutes, and then add fused yttrium partially stabilized zirconia fine powder (stabilization rate 85%) to it, with a particle size greater than 30 μm and less than Equal to 150 μm 1.5 kg, electric fused yttrium partially stabilized zirconia powder (stabilization rate 85%) D50 is 30 μm 1 kg, monoclinic zirconia powder D50 is 3 μm 1 kg, after stirring for 10 min, sieved and dried Put it into the mold, and press it under 150 MPa to form a green body. The green body has an inner diameter of 500mm, an outer diameter of 600mm, a height of 125m...

technical field

[0001] The invention belongs to the field of refractory materials, and mainly relates to a high-purity zirconia refractory product with gradient function and a preparation method. Background technique

[0002] Zirconia is an important refractory raw material with a melting point as high as 2715°C and excellent physical and chemical properties. In order to improve the performance of many refractories, a certain amount of zirconia is added, such as fused AZS bricks, Al 2 o 3 -ZrO 2 -C brick, Cr 2 o 3 -Al 2 o 3 -ZrO 2 bricks etc.

[0003] High-purity zirconia refractory products usually refer to refractory products with a zirconia (including stabilizer) content of more than 98%. It uses zirconia particles or zirconia hollow spheres, zirconia fine powder, stabilizers, binders, etc. as raw materials. The refractory products of the desired shape are prepared by casting, pouring, machine pressing, isostatic pressing, ramming and other molding methods. Comp...

Examples

Embodiment 1

[0022] Weigh fused calcium oxide partially stabilized zirconia particles (stabilization rate 75%), particle size greater than 0.5 mm and less than or equal to 1 mm1 kg, particle size greater than 0.35 mm and less than or equal to 0.5 mm 2.5 kg, particle size greater than 0.15 mm and less than or equal to 0.35 mm 3 kg , premixed in a high-speed kneader for 3 minutes, added 0.3 kg of phenolic resin alcohol solution, continued high-speed stirring for 5 minutes, and then added fused calcium oxide to it and partially stabilized zirconia fine powder (stabilization rate 75%) with a particle size greater than 30 μm is less than or equal to 150 μm 1.5 kg, fused calcium oxide partially stabilized zirconia powder D50 is 10 μm 1 kg, monoclinic zirconia powder D50 is 10 μm 1 kg, stirred at high speed for 10 minutes, sieved, dried, and then loaded into a steel In a mold composed of a core and a rubber sleeve, the green body is formed by isostatic pressing under a pressure of 150 MPa. The gre...

Embodiment 2

[0024] Weigh fused magnesia partially stabilized zirconia particles (stabilization rate: 80%), particle size greater than 0.5 mm and less than or equal to 1 mm 1 kg, particle size greater than 0.35 mm and less than or equal to 0.5 mm 2.5 kg, particle size greater than 0.15 mm and less than or equal to 0.35 mm 3 kg, Pre-mix in a high-speed kneader for 3 minutes, add 0.35 kg of phenolic resin alcohol solution, continue to stir at a high speed for 5 minutes, and then add fused magnesia partially stabilized zirconia fine powder (stabilization rate 80%) to it, with a particle size greater than 30 μm and less than Equal to 150 μm 2 kg, fused magnesia partially stabilized zirconia powder (stabilization rate 80%) particle size D50 is greater than 0.5 μm and less than or equal to 30 μm 1 kg, monoclinic zirconia powder D50 is 2 μm 0.5 kg, after stirring at high speed for 10 minutes, After sieving and drying, put it into a mold consisting of a steel core and a rubber sleeve, and press it ...

Embodiment 3

[0026] Weigh fused yttrium partially stabilized zirconia particles (stabilization rate: 85%), particle size greater than 0.5 mm and less than or equal to 1 mm 1 kg, particle size greater than 0.35 mm and less than or equal to 0.5 mm 2.5 kg, particle size greater than 0.15 mm and less than or equal to 0.35 mm 3 kg, Pre-mix in a high-speed kneader for 3 minutes, add 0.5 kg of phenolic resin alcohol solution, continue to stir at a high speed for 5 minutes, and then add fused yttrium partially stabilized zirconia fine powder (stabilization rate 85%) to it, with a particle size greater than 30 μm and less than Equal to 150 μm 1.5 kg, electric fused yttrium partially stabilized zirconia powder (stabilization rate 85%) D50 is 30 μm 1 kg, monoclinic zirconia powder D50 is 3 μm 1 kg, after stirring for 10 min, sieved and dried Put it into the mold, and press it under 150 MPa to form a green body. The green body has an inner diameter of 500mm, an outer diameter of 600mm, a height of 125m...

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