Zinc Oxide Gallium Oxide Antistatic Coating for Spacecraft
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Solution Overview
Problem
Existing antistatic coatings for spacecraft do not meet the requirements of preventing electrostatic discharges, thermal control, and adherence to environmental standards, particularly due to the use of expensive and non-compliant pigments like tin oxide doped with antimony oxide, which necessitate the addition of titanium dioxide for whiteness and increased solar reflectivity.
Innovation Solution
A composition comprising zinc oxide doped with gallium oxide, combined with a hydroxylated acrylic polymer binder and a solvent, optionally including a hardener and catalyst, formulated to provide a white, electrically conductive coating that meets the necessary specifications for solar absorptivity, infrared emissivity, and adhesion, while avoiding the use of costly and environmentally non-compliant pigments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tin oxide doped with antimony oxide is used as the pigment, then the coating achieves antistatic properties, but the coating fails to meet environmental standards and becomes expensive
Solution Approach 1:
The patent changes the chemical composition parameters by replacing tin oxide doped with antimony oxide with zinc oxide doped with gallium oxide. This substitution maintains the electrical conductivity and antistatic properties while achieving environmental compliance, as zinc oxide is not subject to the same restrictions as tin oxide with antimony doping.
Solution Approach 2:
The patent employs a more cost-effective pigment formulation using zinc oxide doped with gallium oxide. This alternative pigment reduces material costs while maintaining the required functional performance, making the coating more economically viable for spacecraft applications.
2Reliability
If tin oxide doped with antimony oxide is used as the pigment, then the coating achieves antistatic properties, but the coating cost increases
Solution Approach 1:
The patent employs a more cost-effective pigment formulation using zinc oxide doped with gallium oxide. This alternative pigment reduces material costs while maintaining the required functional performance, making the coating more economically viable for spacecraft applications.
Solution Approach 2:
The patent changes the chemical composition parameters by replacing tin oxide doped with antimony oxide with zinc oxide doped with gallium oxide. This substitution maintains the electrical conductivity and antistatic properties while achieving environmental compliance, as zinc oxide is not subject to the same restrictions as tin oxide with antimony doping.
3Temperature
If the coating is made white for thermal control, then solar absorption decreases, but the coating requires additional titanium dioxide which increases complexity
Solution Approach 1:
The patent makes the zinc oxide doped with gallium oxide pigment perform multiple functions simultaneously: it provides electrical conductivity for antistatic protection, maintains white color for solar reflection and thermal control, and ensures environmental compliance. This multi-functionality eliminates the need for separate titanium dioxide addition, simplifying the overall pigment composition.
Solution Approach 2:
The patent combines the functions of electrical conductivity, whiteness, and environmental compliance into a single pigment system (zinc oxide doped with gallium oxide). This merging of functions replaces the need for multiple separate pigments (tin oxide with antimony doping plus titanium dioxide), thereby reducing compositional complexity.
4Ease of manufacture
If the coating uses zinc oxide doped with gallium oxide, then environmental compliance is achieved and cost is reduced, but the pigment must provide both conductivity and whiteness simultaneously
Solution Approach 1:
The patent makes the zinc oxide doped with gallium oxide pigment perform multiple functions simultaneously: it provides electrical conductivity for antistatic protection, maintains white color for solar reflection and thermal control, and ensures environmental compliance. This multi-functionality eliminates the need for separate titanium dioxide addition, simplifying the overall pigment composition.
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 zinc oxide-gallium oxide coating achieves the necessary surface electrical resistance, adhesion, and thermal control, meeting regulatory standards for spacecraft, including low solar absorptivity and high infrared emissivity, while being environmentally compliant and cost-effective.
Implementation Method 1
a first component, called a "base", comprising at least one pigment based on zinc oxide doped with gallium oxide
Implementation Method 2
It is therefore important that the paint is white, to allow total reflection of solar radiation and avoid heating of the machine
Implementation Method 3
these paints must meet very strict specifications in terms of solar absorption (alpha), infrared emissivity (epsilon)
Data Source
AI summary
The invention aims to provide an antistatic white paint suitable for application on spacecraft in particular, based on an acrylic polymer type binder.