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High-purity zirconia insulating refractory product

A technology of refractory products and zirconia, which is applied in the field of refractory materials, can solve the problems of unfavorable energy saving and portability of ultra-high temperature equipment, the influence of the overall structure of the lining material, and the increase of thermal conductivity of the insulation layer, etc., to achieve small crystallization and reduce thermal conductivity rate, improve the effect of thermal shock resistance

Inactive Publication Date: 2019-03-01
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when heavy zirconia products are used as furnace lining, the insulation effect is poor and the heat loss is serious.
[0011] It can be seen that heavy zirconia products have high chemical purity, high mechanical strength, and good volume stability. They are currently commonly used thermal insulation materials above 2200 ° C. However, their material structure is too dense, the thermal insulation performance is poor, and the heat loss is too high. Energy saving and portability of high temperature equipment are extremely unfavorable
Although both zirconia hollow sphere insulation products and zirconia fiber products have low thermal conductivity, they will suffer from severe firing shrinkage when used for a long time above 2100 ° C, and there is a hidden danger of furnace lining deformation and collapse. The product will be pulverized after long-term use, which not only causes a sharp increase in the thermal conductivity of the insulation layer, but also has a serious impact on the overall structure of the lining material

Method used

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  • High-purity zirconia insulating refractory product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The chemical composition with a particle size greater than 43 μm and less than or equal to 100 μm was weighed as a purity of w (ZrO 2 +HfO 2 +CaO) ≥ 99.0% fused calcium oxide stabilized zirconia fine powder 35 kg, particle size D 50 The chemical composition of ≤10μm is w (ZrO 2 +HfO 2 ) ≥ 99.5% monoclinic zirconia powder 8 kg, calcium carbonate fine powder with a particle size greater than 43 μm and less than or equal to 100 μm 1 kg, edible wheat flour with a particle size greater than 43 μm and less than or equal to 100 μm 1 kg, fully pre-mixed by a ball mill to prepare matrix fine powder ; Weighing particle size greater than 0.2 mm less than or equal to 3mm, w (ZrO 2 +HfO 2 +CaO)≥98.3%, bulk density 2.8 g / cm 3 55 kg of calcium oxide-stabilized zirconia porous particles prepared by the sintering method were added into a forced mixer and mixed; to the particles, about 4 kg of a binder with a mass fraction of 5% polyvinyl alcohol aqueous solution was added, and a...

Embodiment 2

[0029] The chemical composition with a particle size greater than 43 μm and less than or equal to 100 μm was weighed as a purity of w (ZrO 2 +HfO 2 +Y 2 o 3 ) ≥99.0% fused yttria stabilized zirconia fine powder 30 kg, particle size D 50 The chemical composition of ≤5μm is w (ZrO 2 +HfO 2 ) ≥ 99.5% monoclinic zirconia powder 7 kg, industrial yttrium oxide fine powder with a particle size greater than 43 μm and less than or equal to 74 μm 1 kg, carbon powder with a particle size greater than 43 μm and less than or equal to 74 μm 2 kg, fully pre-mixed by a ball mill to prepare matrix fine powder; Weigh the particle size greater than 0.2mm and less than or equal to 3mm, w (ZrO 2 +HfO 2 +CaO+MgO+Y 2 o 3 )≥98.0%, bulk density 3.6 g / cm 3 60kg of calcium magnesium yttrium composite stabilized zirconia porous particles prepared by the sintering method were added to the forced mixer and mixed; 5kg of binder phenolic resin alcohol solution was added to the pellets, and after...

Embodiment 3

[0031] The chemical composition with a particle size greater than 43 μm and less than or equal to 74 μm was weighed as a purity of w (ZrO 2 +HfO 2 +Y 2 o 3 ) ≥99.3% fused yttria stabilized zirconia fine powder 28 kg, particle size D 50 The chemical composition of ≤2μm is w (ZrO 2 +HfO 2 ) ≥ 99.5% monoclinic zirconia micropowder 5 kg, 2 kg of polyethylene plastic pellets with a particle size greater than 74 μm and less than or equal to 100 μm, fully premixed by a ball mill to prepare a matrix fine powder; weigh the particle size greater than 0.2 mm and less than or equal to 3 mm, w (ZrO 2 +HfO 2 +Y 2 o 3 )≥99.5%, bulk density 3.6 g / cm 3 65 kg of yttria-stabilized zirconia porous particles prepared by the sintering method were added into a forced mixer and mixed; 5 kg of binder phenolic resin alcohol solution was added to the particles, and after stirring, poured into the premixed matrix fine powder, and after fully mixing, Raw material: Vibration pressing machine ...

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Abstract

The invention belongs to the field of refractory materials, and mainly relates to a high-purity zirconia insulating refractory product. The high-purity zirconia insulating refractory product is composed of an aggregate and a matrix; the aggregate is porous zirconia particles prepared by a sintering method and having a volume density of 3.0-5.0 g / cm<3>; the aggregate accounts for 55%-80% of the total mass of the whole refractory product, and the aggregate has a particle size of 0.2-3 mm; the matrix comprises a mixture composed of zirconia fine powder and zirconia fine powder; the high-purity zirconia insulating refractory product is a refractory material having a certain shape at the normal temperature, and is subjected to heat treatment under a high temperature oxidizing atmosphere of which the maximum firing temperature is 1600-1800 DEG C. The high-purity zirconia insulating refractory product has the characteristics of high use temperature, moderate thermal conductivity and high mechanical strength, and has the functions of heat preservation and structural support at the high temperature.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a heat-insulating refractory product of high-purity zirconia. Background technique [0002] The melting point of zirconia is as high as 2715°C. The zirconia refractory material prepared with it as the main raw material has many advantages such as stable chemical properties at high temperatures, ultra-high service temperature (up to 2400°C or above), and can be used in oxidizing or reducing atmospheres. It is the most mature refractory material for ultra-high temperature field that can be produced and applied industrially. [0003] In addition to being a reaction vessel in the ultra-high temperature field, another main application of zirconia refractories in the ultra-high temperature field is thermal insulation. Compared with ultra-high temperature metal materials such as tungsten and molybdenum, the thermal conductivity of zirconia refractories is less than one-tenth. F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/48C04B38/08
CPCC04B35/48C04B35/66C04B38/08C04B2235/3206C04B2235/3208C04B2235/3225C04B2235/3244C04B2235/77C04B2235/96C04B2235/9607
Inventor 孙红刚谭清华闫双志杜一昊耿可明尚心莲黄振武
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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