Viscosity-Controlled Ceramic Slurry for Additive Manufacturing
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Solution Overview
Problem
Existing ceramic precursor materials for additive manufacturing of low-density, high-porosity ceramic parts face challenges in achieving uniform and controlled deposition due to their heterogeneous nature and rheological properties, which can interfere with the sintering process and degrade the final product's properties.
Innovation Solution
A precursor material comprising refractory fibers, a binder, and a viscosity control additive, such as xanthan gum, is used to create a slurry with a controlled viscosity between 0.3 and 150,000 centipoise, enabling consistent extrusion through a nozzle for additive manufacturing, while maintaining the integrity of the sintering process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rheological properties of the suspension are changed to make it easier to deposit in a controlled way, then the ease of operation is improved, but the sintering process is interfered with and the ultimate properties of the manufactured ceramic part are degraded
Solution Approach 1:
The patent applies parameter changes by carefully controlling the viscosity of the slurry within a specific range (0.3 to 150,000 centipoise) and managing shear-thinning properties to achieve both ease of deposition and sintering process integrity. The precursor material composition is optimized to provide the right rheological parameters for extrusion while maintaining compatibility with sintering.
Solution Approach 2:
The patent uses local quality by creating a heterogeneous suspension with specifically sized and distributed ceramic particles (including micro-particles less than 10 micrometers) within the slurry matrix. This local structuring allows the slurry to have appropriate flow properties for deposition while maintaining particle characteristics that support successful sintering.
2Manufacturing precision
If the suspension is made more homogeneous for controlled deposition, then the manufacturing precision is improved, but the particle segregation increases during processing
Solution Approach 1:
The patent employs composite materials by combining ceramic particles of different sizes and types (including micro-particles, nano-particles, and refractory fibers) in a slurry matrix. This composite structure allows the suspension to maintain homogeneity for precise deposition while the varied particle sizes and properties help prevent segregation during processing and sintering.
Solution Approach 2:
The patent uses an intermediary binder system that mediates between the ceramic particles and the liquid carrier. This binder composition (which may include organic binders, dispersants, and solvents) acts as a intermediary that keeps particles uniformly distributed during deposition while allowing them to maintain their individual characteristics for subsequent sintering without excessive segregation.
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 solution ensures uniform deposition, minimizes particle segregation, and maintains the mechanical stability and porosity of the ceramic parts, reducing manufacturing costs and improving the overall quality of the ceramic parts by controlling viscosity and shear-thinning properties without degrading the sintering process.
Implementation Method 1
a viscosity control additive in admixture with the binder and the body of refractory fibers to provide an overall mixture with a viscosity between about 0.3 centipoise and about 150,000 centipoise
Implementation Method 2
The precursor material further comprises a viscosity control additive in admixture with the binder and the body of refractory fibers to provide an overall mixture with a viscosity between about 0.3 centipoise and about 150,000 centipoise. The overall mixture can be extruded through a nozzle to manufacture the low-density, high porosity ceramic part.
Data Source
AI summary
A precursor material is provided for additive manufacturing of a low-density, high-porosity ceramic part. The precursor material includes a body of refractory fibers and a binder in admixture with the body of refractory fibers. The precursor material further includes a viscosity control additive in admixture with the binder and the body of refractory fibers to provide an overall mixture with a viscosity between about 0.3 centipoise and about 150,000 centipoise.