Fire Containment Panel Using Calcium Aluminate Cement
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Solution Overview
Problem
Existing fire-resistant panels used in shipping containers and fire containment structures are inadequate as they cannot withstand high temperatures exceeding 400-600 degrees Fahrenheit, and their binders degrade under thermal stress, leading to structural failure during lithium-ion battery fires.
Innovation Solution
A thermal barrier panel comprising a monolithic core of blended expanded glass granules with varying sizes and a calcium aluminate cement binder, combined with high alumina cenospheres and polypropylene fibers, which provides enhanced heat resistance and structural integrity up to 2000 degrees Fahrenheit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If epoxy or resin binders are used in fire-resistant panels, then the panels can be manufactured with uniform structure, but the binders evaporate at temperatures exceeding 400-600 degrees Fahrenheit causing structural failure
Solution Approach 1:
The patent changes the chemical composition parameter of the binder from organic epoxy/resin to inorganic calcium aluminate cement, which has a fundamentally different thermal stability profile. This parameter change allows the binder to withstand temperatures exceeding 2,000 degrees Fahrenheit without evaporating or degrading, directly resolving the heat resistance issue while maintaining manufacturability
Solution Approach 2:
The patent creates a composite binder system using calcium aluminate cement combined with alumina-rich materials and glass aggregate. This composite material approach leverages the high-temperature stability of calcium aluminate cement (which forms refractory minerals like CA and C12A7) to achieve superior heat resistance while maintaining structural integrity
2Strength
If low grade Portland cement is used as binder, then the panel is non-combustible and more durable, but long term fire exposure causes degradation and panel failure
Solution Approach 1:
The patent changes the cement type parameter from low grade Portland cement to high-grade calcium aluminate cement. This parameter change is critical because calcium aluminate cement maintains its structural properties at high temperatures unlike Portland cement, which undergoes decomposition and strength loss. The invention achieves both durability and fire resistance by selecting the appropriate cement chemistry
Solution Approach 2:
The patent enhances the local quality of the binder by incorporating alumina-rich materials and controlling the chemical composition to promote formation of heat-resistant minerals. This local enhancement at the binder level ensures that the critical bonding regions maintain strength during fire exposure, preventing panel failure
3Shape
If small size glass aggregate is used to impart rigidity, then the panel structure is rigid, but compression during manufacture forces binder into air spaces reducing heat resistance
Solution Approach 1:
The patent applies local quality by using uniformly sized glass aggregate (0.5mm to 1.0mm) throughout the panel matrix, ensuring consistent rigidity properties. The uniform size distribution prevents voids and ensures optimal binder distribution without excessive compression, maintaining both rigidity and heat resistance
Solution Approach 2:
The patent utilizes the porous structure of expanded glass aggregate to provide thermal insulation. The air spaces within the expanded glass spheres create a porous matrix that resists heat transfer, maintaining heat resistance while the uniform small size provides the necessary rigidity
4Shape
If uniform small size glass aggregate is used, then the panel has rigid structure, but the air content of aggregate is reduced resulting in less heat resistance
Solution Approach 1:
The patent optimizes the local quality of the glass aggregate by selecting a specific size range (0.5mm to 1.0mm) that provides adequate rigidity while preserving the expanded glass's internal air spaces. This size optimization ensures that the aggregate maintains its insulating properties while contributing to panel rigidity
Solution Approach 2:
The patent changes the aggregate size parameter from uniform smallest size to a controlled range (0.5mm to 1.0mm). This parameter adjustment optimizes the balance between rigidity and heat resistance by preventing excessive compression of the aggregate while maintaining structural integrity
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 panel effectively absorbs heat, maintains structural integrity, and prevents disintegration during high-temperature events, ensuring safe containment of lithium-ion battery fires by maintaining flexibility and tensile strength while withstanding extreme temperatures.
Implementation Method 1
expanded glass aggregate within a panel to impart heat resistant characteristics
Implementation Method 2
capable of withstanding temperatures in excess of 2,000 degrees Fahrenheit
Data Source
AI summary
A thermal barrier panel, the panel having a top face overlying a monolithic core, the core comprising a mixture of expanded glass granules, ceramic microspheres and a calcium aluminate cement binder, the expanded glass granules are selected from the group consisting of small granules having a size of about 0.5 mm to 1.0 mm, intermediate granules having a size of about 1.10 mm to 2.00 mm, and large granules having a size of about 2.10 mm to 4.00 mm wherein the volume of intermediate size granules comprises more than 50% of the mixture of expanded glass granules and the balance comprises small and large granules in a ratio of 1:2. The invention is also directed to a shipping container fitted with the fire containment panels of the present invention.