Ceramic Armor via Polymer Infiltration Pyrolysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for manufacturing ceramic armor are limited by high upfront costs, long lead times, and inefficiencies in traditional manufacturing processes, particularly for dismounted soldiers who require customized and in-theater solutions for body armor and protective structures.
Innovation Solution
A method involving 3D printing of ceramic matrix composite parts using preceramic polymers and particulate pastes, which includes the steps of mixing, curing, and pyrolyzing to create lightweight, high-strength ceramic armor, allowing for the production of customized armor plates and structures with minimal equipment investment and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional ceramic armor manufacturing methods are used, then high strength and protection performance are achieved, but high upfront costs and long lead times occur
Solution Approach 1:
The patent changes the manufacturing parameters from traditional high-temperature sintering to a two-stage process involving polymer infiltration and pyrolysis. This parameter change enables additive manufacturing of ceramic armor, reducing lead time while maintaining protection performance through controlled thermal processing at lower temperatures followed by high-temperature pyrolysis
Solution Approach 2:
The patent applies preliminary polymer infiltration into the green body structure before final pyrolysis. This preliminary action creates a precursor matrix that binds ceramic particles and prevents cracking during subsequent heating, enabling complex geometries to be manufactured with reduced lead time compared to traditional methods
2Strength
If traditional ceramic armor manufacturing methods are used, then high strength and protection performance are achieved, but high upfront costs occur
Solution Approach 1:
The patent uses inexpensive organic polymers as temporary sacrificial materials that are later removed through pyrolysis. These polymers serve as binders and pore-forming agents during manufacturing but are consumed in the process, eliminating the need for expensive traditional ceramic binders and reducing overall manufacturing costs while maintaining armor performance
Solution Approach 2:
The patent changes the manufacturing approach from subtractive or formative methods to additive manufacturing with controlled pyrolysis. This parameter change reduces material waste, eliminates expensive tooling requirements, and enables cost-effective production of customized armor pieces while maintaining high protection performance
3Strength
If ceramic armor is manufactured with high particle content, then high strength and density are achieved, but cracking and shrinkage occur during processing
Solution Approach 1:
The patent introduces organic polymers as intermediary materials that infiltrate the ceramic particle network before pyrolysis. These polymers act as temporary binders holding the high particle content structure together during handling and processing, preventing cracking. During controlled pyrolysis, the polymers decompose and leave minimal residue, achieving high density while maintaining reliability
Solution Approach 2:
The patent performs polymer infiltration and pyrolysis in an inert or controlled atmosphere to prevent oxidative damage to the ceramic particles and organic polymers. This controlled environment prevents unwanted chemical reactions that could cause cracking or shrinkage, enabling high particle content formulations to be processed reliably into dense, crack-free armor pieces
4Adaptability or versatility
If customized armor is produced for dismounted soldiers, then adaptability and protection are improved, but manufacturing complexity and lead time increase
Solution Approach 1:
The patent develops a universal additive manufacturing platform using extrusion-based deposition that can produce various ceramic armor geometries, configurations, and sizes from the same equipment. This multi-functional approach enables customized armor for different soldier requirements while using a single manufacturing system, reducing overall complexity compared to specialized processes for each armor type
Solution Approach 2:
The patent changes the manufacturing methodology to additive deposition with layer-by-layer construction, enabling digital customization of armor geometry without retooling. By controlling extrusion parameters, layer thickness, and deposition paths, the same equipment can produce diverse customized armor pieces, reducing manufacturing complexity while improving adaptability to individual soldier needs
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
This approach enables the rapid and cost-effective production of high-density, lightweight ceramic armor with minimal shrinkage and cracking, suitable for various applications including body armor, helmets, and structural protection, while also allowing for the integration of internal channels and material gradations for enhanced performance.
Implementation Method 1
pyrolyzing the CMC part at a first temperature
Implementation Method 2
removing the first organic compound from the mixture
Data Source
AI summary
A method of making a ceramic matrix composite (CMC) part such as armor, in which a mixture, including a preceramic polymer, particles such as ceramic microparticles and/or nanoparticles, and organic compounds such as a surfactant and a solvent, are mixed to form a paste and printed or molded. The part is then cured and densified by polymer infiltration and pyrolysis (PIP) using the preceramic polymer with a varying amount and size of ceramic particles and different temperatures in some of the cycles. The CMC can contain silicon carbide, boron carbide, boron suboxide, alumina, or any other ceramic. The process is compatible with sacrificial materials, enabling the creation of parts with hollow portions or overhangs. The mixture preferably has a high loading of particles, for example between 70 wt % and 90 wt % of the mixture, in order to minimize shrinkage. Curing and pyrolyzing the part can be performed by microwaving. Two such CMC parts can be joined together by using the paste, having the same or a different concentration of particles, as an adhesive.