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A zirconia light heat insulation refractory product

A technology of refractory products and zirconia, applied in the field of refractory materials, can solve problems such as affecting normal use, affecting the long-term stable service of products, and affecting performance.

Active Publication Date: 2021-08-31
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although zirconia hollow sphere products have ideal thermal insulation performance as the lining material of ultra-high temperature kiln, because the aggregate uses zirconia hollow spheres, which belong to electric melting raw materials, the surface is very smooth, the sintering activity is low, and the bonding performance with the matrix Poor, resulting in low structural strength, long-term high temperature environment, easy to cause product cracking, broken, etc., thus affecting normal use
On the other hand, spherical aggregates are prone to roll and slip due to their shape characteristics in high temperature environments, resulting in poor product structure stability and affecting their performance. The high temperature creep test can be used to measure the high temperature of refractory products. Structural stability, the creep rate of zirconia hollow sphere products is about 1.5%~2.0% (1550℃×50h, 0.2MPa), while the creep rate of heavy zirconia products is usually ≤1% (1550℃×50h, 0.2MPa), it can be seen that the creep resistance of zirconia hollow ball products is not as good as that of heavy zirconia products, and its high-temperature structural stability is weak, which may affect the long-term stable service of products in high-temperature environments

Method used

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  • A zirconia light heat insulation refractory product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh the size ≤0.074 w (Zro 2 + HFO 2 + Y 2 O 3 ) ≥99% of stabilized zirconia fused powder 20kg, particle size D 50 = 2μm of w (Zro 2 ) ≥99.2% monoclinic zirconia powder of 13kg, the particle size D 50 = 6μm yttria powder 2kg, put into a ball mill jar with a zirconia powder mixed thoroughly by a ball mill for 1 hour to prepare a; 1mm ~ 3mm size were taken that w (Zro 2 + HFO 2 ) = 85.5%, w (Y 2 O 3 ) = 13%, density of 2.7g / cm 3 The fused zirconia hollow sphere particles 50kg, size 0.074 ~ 2mm, w (Zro 2 + HFO 2 ) = 90%, w (Y 2 O 3 ) = 8%, density of 3.4 g / cm 3 Zirconia sintered porous lightweight aggregate particles 15kg. The fused zirconia hollow spherical particles and sintered zirconia particles together into porous lightweight aggregate cement mortar mixer stirring 1min, mass fraction of 8% PVA (polyvinyl alcohol) aqueous solution in a mixer 4kg as binding agent, jointly with stirring 3min after the premix was added zirconia powder, the stirring was continued for 10...

Embodiment 2

[0020] Weigh the size ≤0.074 w (Zro 2 + HFO 2 + Y 2 O 3 ) ≥99.2% of stabilized zirconia fused powder 25kg, particle size D 50 = 1.6μm the w (Zro 2 ) ≥99.2% monoclinic zirconia powder 9kg, particle size D 50 = 6μm yttria powder 1kg, zirconia powder was put together with a ball mill for 1 hour to prepare a ball mill jar; 1mm ~ 3mm size were taken that w (Zro 2 + HFO 2 ) = 90%, w (Y 2 O 3 ) = 8.5%, a density of 2.6g / cm 3 The fused zirconia hollow sphere particles 44.5kg, size 0.074 ~ 2mm, w (Zro 2 + HFO 2 ) = 90%, w (Y 2 O 3 ) = 8%, density of 3.4 g / cm 3 Zirconia sintered porous lightweight aggregate particles 21.5kg. The fused zirconia hollow spherical particles and sintered zirconia particles together into porous lightweight aggregate cement mortar mixer stirring 1min, mass fraction of 8% PVA (polyvinyl alcohol) aqueous solution in a mixer 4kg as binding agent, jointly with stirring 3min after the premix was added zirconia powder, the stirring was continued for 10min, after mix...

Embodiment 3

[0022] Weigh the size ≤0.074 w (Zro 2 + HFO 2 + Y 2 O 3 ) ≥98.5% zirconium oxide stabilized fused powder of 12kg, the particle size D 50 = 3μm of w (Zro 2 ) ≥99% of the monoclinic zirconia powder 12.5kg, particle size D 50 = 6μm yttria powder 0.5kg, zirconia powder was put together with a ball mill for 1 hour to prepare a ball mill jar; 1mm ~ 3mm size were taken that w (Zro 2 + HFO 2 ) = 93.5%, w (Y 2 O 3 ) = 5%, density of 2.4g / cm 3 The fused zirconia hollow sphere particles 45kg, size 0.074 ~ 2mm, w (Zro 2 + HFO 2 ) = 93%, w (Y 2 O 3 ) = 5%, density of 3.1 g / cm 3 Zirconia sintered porous lightweight aggregate particles 30kg. The fused zirconia hollow spherical particles and sintered zirconia particles together into porous lightweight aggregate cement mortar mixer stirring 1min, water-soluble resin is added, in a mixer 4kg as binding agent, jointly 3min after stirring was added a premixed zirconia powder feeding, stirring was continued for 10min, after mixing sufficiently be ...

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Abstract

The invention belongs to the field of refractory materials and relates to a zirconia light-weight thermal insulation refractory product. The raw materials of the zirconia lightweight thermal insulation refractory products involved include two parts: aggregate and matrix; the aggregate is composed of fused zirconia hollow sphere particles with a particle size > 0.074mm and sintered zirconia porous lightweight aggregate particles; the matrix is ​​composed of a particle size ≤ 0.074 mm of zirconia powder mixture; fused zirconia hollow spherical particles account for 35% to 50% of the total mass of refractory products, and sintered zirconia porous lightweight aggregate particles account for 15% to 30% of the total mass of refractory products. Zirconium powder accounts for 20% to 40% of the total mass of refractory products; zirconia light heat preservation refractory products are refractory materials with a certain shape at room temperature, and are fired at a maximum firing temperature of 1600°C to 1800°C in an oxidizing atmosphere. to make. The invention delays the rolling and sliding of hollow spherical particles under high temperature caused by external force, and improves the structural stability.

Description

Technical field [0001] The present invention belongs to the field of refractories, zirconia primarily relates to a lightweight insulation refractory products. Background technique [0002] Zro 2 Having a high melting point (above 2700 deg.] C), its main product is prepared zirconia refractory materials, good chemical stability at high temperatures, excellent corrosion resistance, stable redox properties, can be used as thermal insulation material or materials used in the operating temperature ultra high temperature above 2000 deg.] C in the industrial furnace. [0003] Currently used in the field of ultra-high temperature insulation properties of zirconia article according to their classification, there are three heavy article zirconia, zirconia bubble products and zirconia fiber products; zirconium oxide article is heavy use of fused dense oxide zirconium aggregate and fines as the main raw material, by forming a dense structure and a high temperature sintering and the formation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/482C04B35/622C04B38/08
CPCC04B35/482C04B35/622C04B38/08C04B2235/3225C04B2235/3244C04B2235/3246C04B2235/5427C04B2235/5436C04B2235/656C04B2235/77C04B2235/96C04B2235/9607
Inventor 杜一昊孙红刚尚心莲
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES