Aluminium Nitride Slip Casting for Complex Ceramic Heater Shapes
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Solution Overview
Problem
Existing tape-casting methods for manufacturing aluminium nitride ceramic components, such as heater components, are limited in shape complexity and face challenges in integrating electronic hardware, leading to potential defects between layers.
Innovation Solution
A slip-casting method using an aluminium nitride ceramic slurry with no more than 5 wt% polymer binder, comprising aluminium nitride powder, solvent, and optional dispersants and ceramic additives, allows for the production of complex shapes and integrated electronic components by slip casting and sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tape-casting method is used to manufacture aluminium nitride ceramic components, then manufacturing efficiency is improved and high-quality ceramic products are produced, but shape complexity is limited and integrating electronic hardware becomes challenging
Solution Approach 1:
The patent changes the key parameter of binder content from conventional high levels (5-15 wt%) to a low level (0.1-5 wt%), which fundamentally alters the slurry's casting characteristics. This parameter change enables the slurry to be cast into complex three-dimensional shapes using slip-casting techniques while maintaining manufacturing efficiency and product quality, thus resolving the contradiction between productivity and shape complexity.
2Productivity
If tape-casting method is used to manufacture aluminium nitride ceramic components, then manufacturing efficiency is improved, but defects between layers occur and electronic hardware integration becomes challenging
Solution Approach 1:
The patent segments the manufacturing process into two distinct approaches: slip-casting for complex three-dimensional shapes with integrated electronics, and tape-casting for simple flat components. This segmentation allows each method to be optimized for its specific application, eliminating the layer-defect problem inherent in multi-layer tape-casting while maintaining productivity for both complex and simple geometries.
Solution Approach 2:
By changing the binder content parameter to a low level (0.1-5 wt%), the slurry achieves better flow characteristics and complete mould filling during slip-casting. This parameter change eliminates voids and defects between layers that commonly occur in conventional tape-casting, thereby improving reliability without sacrificing manufacturing efficiency.
3Ease of operation
If conventional slurry formulation with high polymer binder is used, then slurry processing is easier, but structural integrity of the green product is reduced and defects occur
Solution Approach 1:
The patent applies parameter changes by reducing the binder content from conventional high levels (5-15 wt%) to a low level (0.1-5 wt%). This change requires modified slurry processing techniques, such as controlled humidity environments and adjusted casting speeds, but ultimately produces green products with superior structural integrity and eliminates defects associated with high binder formulations.
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 method enables the production of ceramic components with improved structural integrity and embedded electronic components, capable of forming complex shapes and reducing defects, while maintaining the integrity of the final product.
Implementation Method 1
allowing the slurry to dry to produce the green product
Implementation Method 2
sintering the green product to dry to produce the aluminium nitride ceramic component
Data Source
AI summary
A method of casting an aluminium nitride ceramic component involving providing an aluminium nitride ceramic slurry, the slurry containing: aluminium nitride powder; a solvent; and a polymer binder, wherein the slurry contains no more than 5 wt % polymer binder; slip casting a green product using the slurry; and sintering the green product to dry to produce the aluminium nitride ceramic component.