Polymer Preform Encapsulation for High-Temperature Additive Manufacturing
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Solution Overview
Problem
Additive manufacturing techniques, such as selective laser sintering, face limitations in producing parts that can withstand high operating temperatures, particularly in aerospace applications like hypersonic vehicles, where polymer parts degrade due to temperatures between 400 °C and 600 °C, and high-temperature alloys are difficult and expensive to work with.
Innovation Solution
A method involving the additive manufacturing of a polymer preform, followed by encapsulation with a metal or metal alloy capable of withstanding higher temperatures, and subsequent heating to transform the preform into a carbonaceous solid residue, using a process that includes nickel plating and controlled heating in an inert environment to maintain structural integrity at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer parts are used in additive manufacturing, then manufacturing complexity is reduced and lead times are shortened, but the parts cannot withstand high operating temperatures above the polymer degradation point
Solution Approach 1:
The patent creates a composite structure by coating polymer preform parts with a ceramic slurry containing refractory material particles. This composite combines the manufacturing advantages of polymers with the high-temperature resistance of ceramics, allowing the part to withstand temperatures above 1000°C while maintaining the complexity and lead time benefits of additive manufacturing
Solution Approach 2:
The patent transforms the surface properties of the polymer part by applying a ceramic coating that changes the thermal parameters of the part. The coating process involves applying a slurry, drying it, and firing it to create a permanent high-temperature resistant surface layer, thereby changing the temperature parameter from polymer degradation point to above 1000°C
2Temperature
If high-temperature alloys are used to withstand temperatures between 400°C and 600°C, then temperature resistance is improved, but manufacturing difficulty and cost increase significantly
Solution Approach 1:
The patent uses a composite material system where a polymer matrix is combined with ceramic refractory particles in a slurry coating. This composite provides high-temperature resistance comparable to high-temperature alloys but can be applied to complex geometries through additive manufacturing, avoiding the manufacturing difficulties and high costs of working with high-temperature alloys
Solution Approach 2:
The patent introduces a ceramic slurry coating as an intermediary layer between the polymer part and the high-temperature environment. This intermediary protective layer allows the use of easier-to-manufacture polymer parts while achieving the temperature resistance previously requiring difficult-to-manufacture high-temperature alloys
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 resulting object can sustain operating temperatures up to 500 °C for extended periods, offering a lightweight, temperature-tolerant structure that combines the benefits of additive manufacturing with enhanced thermal resistance.
Implementation Method 1
heating the preform at a predetermined temperature and for a predetermined period of time, such that the preform transmutes into the form of a carbonaceous solid residue
Implementation Method 2
electromagnetic radiation, for example from a CO 2 laser, is used to bind a powder building material at select points to create a solid structure
Data Source
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AI summary
Method for producing an object by additively manufacturing a preform of the object from a building material comprising a polymer. The preform is encapsulated with a metal or metal alloy encapsulant that is capable of withstanding temperatures greater than the preform. The encapsulated preform is heated at a predetermined temperature and for a period of time, such that the preform at least partially transmutes into the form of a carbonaceous solid.