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Composite coating material for high temperature heat barrier and ablation barrier, and its uses

A composite coating, warm technology, applied in coatings, fire retardant coatings, polyester coatings, etc., can solve the problems of surface coating collapse and cracking, thermal barrier protection failure, surface thermal barrier coating losing the basis of attachment, etc. Simple equipment, good thermal insulation effect, and easy control of process parameters

Inactive Publication Date: 2006-12-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, usually this kind of coating is applied when the inside of the substrate protected by the coating is in a relatively stable temperature range. If the heat inside the substrate is not dissipated, the temperature of the substrate will continue to rise, eventually causing the substrate to soften or Melting causes the thermal barrier coating on the surface to lose its base, causing the surface coating to collapse and crack, resulting in failure of thermal barrier protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 8.5 kg of partially stabilized ZrO with a particle size of 10-100nm 2 / Y 2 o 3 powder (yttrium oxide partially stabilized zirconia powder), add 1.5 kg of nano-silicon oxide, and 0.2 kg of polyvinyl alcohol binder, after mixing fully, add 11 kg of clean water and stir to form a uniformly dispersed and suspended slurry. use. The partially stabilized ZrO 2 / Y 2 o 3 Y in powder 2 o 3 The content is 5-7wt%.

[0039] Dry and pure compressed air is used as the carrying gas, the gas pressure is controlled at 0.8Mpa, and the slurry is sprayed into the drying tower by a two-flow nozzle. The atomized slurry shrinks into a reunited hollow sphere depending on its own surface tension. In medium drying, the heating temperature of the drying tower heater is controlled between 150-280°C, and the adjustment of the temperature is limited to the sufficient drying of the powder. The dried agglomerated powder is then drawn into a cyclone for collection by means of an aspirator....

Embodiment 2

[0044] Take 7.0 kg of partially stabilized ZrO with a particle size of 10-100nm 2 / Y 2 o 3 Powder, 1.0 kg of nano-silicon nitride and 2.0 kg of copper powder with a particle size of 0.5 μm, add 0.2 kg of polyvinyl alcohol adhesive, after thorough mixing, add 11 kg of clean water and stir to form a uniformly dispersed and suspended material pulp for later use. The partially stabilized ZrO 2 / Y 2 o 3 Y in powder 2 o 3 The content is 5-7wt%.

[0045] Spray the slurry into the drying tower with a centrifugal atomizing nozzle. The rotational speed of the centrifugal atomizer is 800-2000r / min. The atomized slurry particles shrink into agglomerated solid spheres by their own surface tension and are dried in the hot wind. , The heating temperature of the drying tower heater is controlled between 150-280 ° C, and the adjustment of the temperature is limited to the sufficient drying of the powder. The dried agglomerated powder is then drawn into a cyclone for collection by mean...

Embodiment 3

[0050] Take 7.0 kg of partially stabilized ZrO with a particle size of 10-100nm 2 / Y 2 o 3 Powder, 2.0 kg of 10-30 μm copper powder and 1.0 kg of 10-30 μm organic polymer (phenolic resin) powder, add 0.2 kg of polyvinyl alcohol adhesive, mix well, and then add 11 kg of clean water Stir to form a uniformly dispersed and suspended slurry for later use. The partially stabilized ZrO 2 / Y 2 o 3 Y in powder 2 o 3 The content is 5-7wt%.

[0051] Dry and pure compressed air is used as the carrying gas, the gas pressure is controlled at 0.8Mpa, and the slurry is sprayed into the drying tower by a two-flow nozzle. The atomized slurry shrinks into a reunited hollow sphere depending on its own surface tension. In medium drying, the heating temperature of the drying tower heater is controlled between 150-280°C, and the adjustment of the temperature is limited to the sufficient drying of the powder. The dried agglomerated powder is then drawn into a cyclone for collection by means ...

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Abstract

The invention relates the surface coating material with heat-insulating property. The material is made by the 55-85wt% ZrO2 / Y2O3 powder, 15-45wt% erosion findings, binder and water. The binder is 2-5wt% of ZrO2 / Y2O3 powder and erosion findings, and the weight of water is 1-1.3 times than ZrO2 / Y2O3 powder and erosion findings and binder. The invention has the advantages of long life and easy operability.

Description

technical field [0001] The invention relates to a surface engineering coating material with heat insulation function and its application, in particular to a composite coating material with dual effects of high temperature thermal barrier and ablation heat protection and heat insulation and its application. Background technique [0002] Thermal barrier is one of the commonly used heat insulation technologies at present. The thermal barrier coating uses the high thermal resistance of the material to prevent heat transfer inward as the main mechanism of heat insulation. Zirconia is an ideal high-temperature thermal barrier material due to its high melting point, low thermal conductivity, good thermal stability, and low high-temperature creep. But pure ZrO 2 The material generally cannot be used directly as a thermal barrier coating because of its crystalline transformation that will cause erosion. ZrO 2 There are three crystal forms: monoclinic, tetragonal, cubic, and monocl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D161/06C09D183/00C09D167/00C09D5/18C09D7/12
Inventor 程旭东杨章富张覃轶章桥新张子军邓飞飞高忠宝王晋春李丹虹
Owner WUHAN UNIV OF TECH
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