Graphene-Coated Heating Element for Uniform Aerosol Heating
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Solution Overview
Problem
Aerosol-generating devices face challenges in achieving uniform heating of aerosol-forming substrates and require improved resilience of heating elements due to friction during insertion and retraction, with existing heating elements lacking in mechanical properties such as strength, toughness, and wear resistance.
Innovation Solution
Incorporating a carbon-containing layer, particularly graphene, on the heating element to enhance thermal and mechanical properties, ensuring even heat distribution and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating element is used without a carbon-containing layer, then the device structure is simpler and manufacturing is easier, but the heat distribution is non-uniform and mechanical properties are insufficient
Solution Approach 1:
The heating element combines a base material (such as metal or ceramic) with a carbon-containing layer to create a composite structure. This composite material approach allows the heating element to benefit from both the structural properties of the base material and the superior thermal conductivity and mechanical properties of the carbon-containing layer, achieving uniform heat distribution while maintaining structural integrity
Solution Approach 2:
The invention modifies the surface properties of the heating element by adding a carbon-containing layer with specific physical and chemical parameters. This layer changes the thermal conductivity, surface hardness, and friction characteristics of the heating element, enabling improved heat distribution and mechanical performance without fundamentally changing the overall device structure
2Reliability
If the heating element surface is made more resilient to withstand friction, then the lifetime is improved, but the manufacturing complexity increases
Solution Approach 1:
The carbon-containing layer acts as a sacrificial or wear-resistant coating that protects the more expensive and complex heat-generating portion. While the carbon layer may wear over time, it extends the functional lifetime of the heating element by protecting the underlying structure from direct friction and mechanical degradation
Solution Approach 2:
The carbon-containing layer serves as an intermediary between the heat-generating portion and the external environment (aerosol-forming article). It mediates the interaction by providing a surface that is more resistant to friction and wear, while still allowing effective thermal contact and heat transfer to the substrate
3Productivity
If the heating element operates at higher temperature to heat the substrate faster, then the heating speed is improved, but the energy efficiency decreases and mechanical properties deteriorate
Solution Approach 1:
The carbon-containing layer has superior thermal conductivity compared to conventional heating element materials. This parameter change in thermal conductivity allows the heating element to distribute heat more efficiently across its surface and into the substrate, enabling effective heating at slightly lower operating temperatures and improving overall energy efficiency
Solution Approach 2:
The composite structure of the heating element with carbon-containing layer provides optimized thermal pathways. The carbon layer's high thermal conductivity creates efficient heat distribution channels, allowing heat to spread uniformly and penetrate the substrate more effectively, achieving fast heating rates with reduced energy input requirements
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 carbon-containing layer, especially graphene, facilitates uniform heating, increases mechanical strength, and enhances the heating element's durability and efficiency by distributing thermal energy evenly while maintaining mechanical integrity.
Implementation Method 1
The carbon-containing layer is in thermal contact with the heat-generating portion... the thermal energy created by the heat-generating portion may be evenly distributed over the surface of the heating element
Implementation Method 2
Graphene is known to possess remarkable 2-dimensional properties. In particular graphene has very high thermal and electric conductivity along the plane defined by the layer of graphene. Accordingly by providing a layer of graphene thermal energy is distributed fast and evenly over those parts of the heating element that are provided with the graphene layer
Data Source
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AI summary
The heating element for an aerosol-generating device comprises a heat-generating portion and a carbon-containing layer in thermal contact with the heat-generating portion. The aerosol-generating device comprises such heating element and a heating chamber configured to receive an aerosol-generating article containing aerosol-forming substrate.