A nanocomposite ceramic coating suitable for inorganic fibers and its preparation method

Abstract

The invention discloses a nanometer composite ceramic -coating suitable for inorganic fibers, and a preparation method thereof. The coating comprises a basic liquid and a filler, wherein the basic liquid comprises rare earth zirconate nano-powder, a nano-alumina dispersed saturated liquid, a dispersant and a polymer modified aqueous assistant; the filler comprises zirconia and alumina mixed micro-powder; and the coating concretely comprises 2-36wt% of the rare earth zirconate nano-powder, 6-52wt% of the nano-alumina dispersed saturated liquid, 0.1-4wt% of the dispersant, 1-18wt% of the polymer modified aqueous assistant, and 3-22wt% of the zirconia and alumina mixed micro-powder. The nanometer composite ceramic coating realizes super strong penetration of an inorganic fiber heat insulation material and restoration filling, cladding and binding of fiber monomers to form a three-dimensional nanometer composite ceramic protection matrix adopting the inorganic fiber heat insulation materials as a skeleton and nanometer composite ceramic particles as a filling, cladding and binding material, so penetration corrosion of high temperature, high concentration lithium and lead atmosphere (ions or gas) to the inorganic fiber heat insulation material is efficiently blocked.

Description

technical field [0001] The invention relates to a coating, which belongs to the technical field of nanocomposite ceramics, in particular to a nanocomposite ceramic coating suitable for inorganic fibers and a preparation method thereof. Background technique [0002] Inorganic fiber thermal insulation and energy-saving materials are currently an important branch of high-temperature thermal insulation and energy-saving materials, which have the advantages of light weight and high thermal insulation efficiency. However, there are also obvious disadvantages at the same time: insufficient high temperature corrosion resistance, poor density (air tightness), low surface strength, not resistant to high temperature airflow (flame) erosion, capacity aging (powdering and ash removal), etc. [0003] In view of the advantages and disadvantages of inorganic fiber thermal insulation and energy-saving materials, the current use of this material, if it is just ordinary thermal insulation, is ...

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Problems solved by technology

However, there are also obvious disadvantages at the same time: insufficient high temperature corrosion resistance, poor density (air tightness), low surface strength, not resistant to high temperature airflow (flame) erosion, capacity aging (powdering and ash removal), etc.

like figure 1 , 2 As shown, in the prior art, because the ordinary coating is only attached to the surface of the inorganic fiber 1 to form a layer of coating, the coating is loosely piled up, and a large amount of stable intermediate phase is not formed, and the coating particles are not effective on the defective part 11 of the inorganic fiber 1. Filling and coating lead to loose combination of coating particles and inorganic fibers, loose overall structure, poor bonding strength, poor thermal shock resistance (cracking and peeling after cold and heat), and no corrosion resistance.

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