Ultra-Low Density Abradable Seal Coating for Aero-Engines
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Solution Overview
Problem
Existing abradable seal coating materials for aero-engines face challenges in balancing density, strength, and abradability, with many materials having high density, poor flame retardancy, and environmental concerns.
Innovation Solution
The development of an environment-friendly and flame-retardant abradable seal coating material with an ultra-low density, composed of two separately packaged components A and B, which include specific weight percentages of bisphenol A epoxy resin, liquid phosphorus-containing epoxy resin, hollow glass microbeads, and other additives, to achieve enhanced mechanical properties and flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional abradable coating materials are used to improve sealing performance and protect fan blades, then the sealing performance is improved and blade damage is reduced, but the density increases and fuel consumption increases
Solution Approach 1:
The patent employs hollow glass microbeads as fillers to create a porous structure within the coating material. These hollow spherical particles provide internal void spaces that significantly reduce the overall density of the coating while maintaining its structural integrity and sealing functionality. The porous structure allows the coating to achieve both light weight and effective sealing performance.
Solution Approach 2:
The patent develops a composite coating material combining epoxy resin matrix with hollow glass microbeads and flame retardant additives. This composite structure integrates multiple functions: the epoxy resin provides binding and adhesion, the hollow glass microbeads provide low density and abradability, and the flame retardant additives provide fire resistance. The synergistic combination achieves both low density and high reliability.
2Reliability
If flame retardant additives are added to improve flame retardancy, then flame retardancy is improved, but toxic corrosive gases are produced and environmental problems occur
Solution Approach 1:
The patent converts the harmful effect of flame retardancy testing into a beneficial outcome by using phosphorus-containing compounds that promote char formation and carbonization. This char layer acts as a protective barrier that prevents combustion while producing minimal toxic gases. The flame retardant mechanism is transformed from direct chemical inhibition to physical barrier formation, eliminating the harmful byproducts.
Solution Approach 2:
The patent changes the chemical composition parameters by using phosphorus-containing epoxy resins and curing agents instead of traditional bromine-based flame retardants. This parameter change in the chemical composition fundamentally alters the flame retardancy mechanism, achieving fire resistance through phosphorus-induced char formation rather than through harmful halogenated compounds.
3Weight of moving object
If hollow glass beads are used to reduce density, then density is reduced and light weighting is achieved, but the coating process becomes cumbersome and quality control is difficult
Solution Approach 1:
The patent performs preliminary action by pre-mixing the hollow glass microbeads with the epoxy resin and flame retardant additives before application. This pre-mixing step ensures uniform distribution of all components, including the hollow beads, which prevents clumping and ensures consistent coating properties. The preliminary mixing simplifies the overall application process and improves quality control by eliminating the need for separate bead incorporation steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The coating material achieves an ultra-low density while maintaining appropriate mechanical strength, excellent aging resistance, abradability, water resistance, and flame retardancy, meeting the requirements for light weighting and low fuel consumption in engines.
Implementation Method 1
20-40 wt % of a hollow glass microbead
Implementation Method 2
0.5-3 wt % of a silane coupling agent
Implementation Method 3
20-30 wt % of a liquid phosphorus-containing curing agent, 30-40 wt % of a bisphenol A epoxy resin, 30-40 wt % of a liquid phosphorus-containing epoxy resin
Implementation Method 4
excellent aging resistance, abradability, water resistance, and flame retardancy
Implementation Method 5
abradability
Data Source
AI summary
Disclosed is an environment-friendly and flame-retardant abradable seal coating material with an ultra-low density and a use method thereof. The seal coating material includes a component A and a component B packaged separately; the component A includes 20-30 wt % of a curing agent for bisphenol A epoxy resin, 20-30 wt % of a liquid phosphorus-containing curing agent, 20-40 wt % of a hollow glass microbead, 1-5 wt % of 2,4,6-tris(dimethylaminomethyl)phenol, 5-15 wt % of dimethyl methylphosphonate and 0.5-3 wt % of a silane coupling agent; the component B includes 30-40 wt % of a bisphenol A epoxy resin, 30-40 wt % of a liquid phosphorus-containing epoxy resin, 20-30 wt % of a hollow glass microbead, 0-10 wt % of a liquid acrylonitrile-butadiene rubber and 0.5-3 wt % of a silane coupling agent. The method includes: mixing the component A and the component B to obtain a coating, and applying the obtained coating to a surface of a part for curing.