Fiber reinforced high temperature thermal barrier composite ceramic thick coating material as well as preparation and application thereof

A technology of composite ceramics and coating materials, applied in the direction of ceramic layered products, laminated, layered products, etc., can solve the problems of restricting the thickness of ceramic coatings, brittle fracture of coatings, etc., and achieve easy control of process parameters, good insulation The effect of thermal action and simple equipment

Inactive Publication Date: 2009-09-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Macroscopically, when cooling after spraying, the coating tends to be brittle and fractured instantly, which limits the thickness of the ceramic coating that can be prepared

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Partially stabilized ZrO with a particle size of 10-100nm 2 / Y 2 o 3 Powder (PYSZ powder, Y 2 o 3 The content is 5~7wt%) 10 kilograms, carry out spray-drying and make agglomerated spherical powder, take the powder between -180~+325 mesh sieve, its particle size range is 40~90 μ m, as the coating material for plasma spraying;

[0037] (2) Use compressed air to spray the hard abrasive (brown corundum) on the surface of the workpiece at high speed to make it rough. A nickel-clad aluminum (Ni / Al) adhesive layer with a thickness of 0.8-1.2 μm is sprayed on the surface of the roughened workpiece. The main technical parameters of the plasma spraying process are: power 35-40KW, voltage 70-80V, current 450-500A.

[0038] (3) On the surface of the bonding layer, plasma spray the above-mentioned powder coating material to prepare a layered spray coating, the coating thickness reaches 0.2-0.5mm, the power used for spraying is 40-45KW, the voltage is 75-85V, and the current...

Embodiment 2

[0042] (1) Partially stabilized ZrO with a particle size of 10-100nm 2 / Y 2 o 3 Powder (PYSZ powder, Y 2 o 3 The content is 5~7wt%) 6.5 kilograms and silicon oxide 1.5 kilograms, particle size is 0.5 kilograms of copper powder ≤30 μm and particle size is 1.5 kilograms of phenolic resin of 10~30 μm, carry out spray drying and make agglomerated spherical powder, take -180~+ The powder between 325 mesh sieves, with a particle size range of 40-90 μm, is used as a coating material for plasma spraying.

[0043] (2) Use compressed air to spray the hard abrasive (brown corundum) on the surface of the workpiece at high speed to make it rough. A nickel-clad aluminum (Ni / Al) adhesive layer with a thickness of 0.8-1.2 μm is sprayed on the surface of the treated workpiece. The main technical parameters of the plasma spraying process are: power 35-40KW, voltage 70-80V, current 450-500A.

[0044] (3) On the surface of the bonding layer, plasma spray the above-mentioned powder coating m...

Embodiment 3

[0048] (1) Partially stabilized ZrO with a particle size of 10-100nm 2 / Y 2 o 3 Powder (PYSZ powder, Y 2 o 3 The content is 5~7wt%) 6.5 kilograms and silicon nitride 1.5 kilograms, particle size is the copper powder 0.5 kilogram of ≤30 μm and particle size is 10~30 μm modified silicone resin 1.5 kilograms, carry out spray drying and make agglomerated spherical powder. The powder between -180 and +325 mesh sieves, with a particle size range of 40 to 90 μm, is used as a coating material for plasma spraying.

[0049] (2) Use compressed air to spray the hard abrasive (brown corundum) on the surface of the workpiece at high speed to make it rough. Spray a layer of NiCoCrAlY adhesive layer with a thickness of 0.8-1.2 μm on the surface of the treated workpiece. The main technical parameters of the plasma spraying process are: power 35-40KW, voltage 70-80V, current 450-500A.

[0050] (3) On the surface of the bonding layer, plasma spray the above-mentioned powder coating materia...

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Abstract

The invention relates to a fiber reinforced high temperature thermal barrier composite ceramic thick coating material. The fiber reinforced high temperature thermal barrier composite ceramic thick coating material has the following structure: spray coating layers having the 'concrete' action and reinforced layers which are arranged between the spray coating layers and have the 'steel bar' action are arranged in turn on the surface of a metallic matrix workpiece of a spray coating and cementing bottom layer; the spray coating layers at least have 3 layers and are prepared from a powdery composite coating material with double effects of high temperature thermal barrier and ablative heat protection by a plasma spraying process; and the reinforced layers are formed by high temperature fibers which wrap the spray coating layers in a paralleled or staggered mode for one or two times, and the use temperature of high temperature fibers is more than or equal to 700 DEG C. The material is prepared by the following steps: preparation of a matrix, spray coating, wrapping and the like. The material can be coated on the surfaces of various aircrafts moving at a high speed in the atmospheric layer through the plasma spraying process so as to have the actions of the high temperature thermal barrier and the ablative composite protective layer. The material can improve the upper limit of the working temperature of a metallic matrix in a high temperature environment and simultaneously prolong the service time of the metallic matrix in a high temperature extreme environment. The material has high practicability and is suitable for the industrialized production.

Description

technical field [0001] The invention relates to a surface engineering coating material with heat insulation function and its application, in particular to a fiber-wound composite thick coating material with high temperature thermal barrier and ablation 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, monoclinic phase m-ZrO at low temperature 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04B32B15/04B32B18/00B32B17/02B32B33/00B32B37/02C04B35/48C04B35/505C04B35/80
Inventor 程旭东励德亮闵捷肖巍张琦孟令娟李光磊王珂王辉万倩
Owner WUHAN UNIV OF TECH
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