Inkjet Ceramic Suspension Stability for 3D Prostheses
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Solution Overview
Problem
Conventional methods for producing three-dimensional ceramic bodies are inefficient for producing small numbers of varied shapes, as they lack stability and dimensional accuracy due to settling ceramic particles in inkjet printing, leading to unsuitable prostheses with uneven density and strength.
Innovation Solution
A suspension comprising 50-80% ceramic particles in an aqueous boehmite sol with low molecular weight alcohol and organic fluidizers is used for inkjet printing, maintaining stability and preventing particle settling, allowing for high-dimensional accuracy and uniform mechanical properties in the ceramic bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional molding methods (pressing or casting) are used to produce three-dimensional ceramic bodies, then mass production of identical shapes is efficient, but production of small numbers of varied shapes (such as individualized prostheses) becomes difficult and inefficient
Solution Approach 1:
The patent employs digital model parameters to define varying geometric shapes of ceramic prostheses. By changing digital parameters in the computer model, different prosthesis shapes can be produced without physical tooling changes, enabling both mass production efficiency and individualized customization
Solution Approach 2:
The pressing device is designed with universal applicability to produce different prosthesis shapes through digital modeling. The same pressing apparatus can manufacture various ceramic body configurations by receiving different digital models, eliminating the need for dedicated molds for each shape variant
2Adaptability or versatility
If inkjet printing with ceramic particle suspension is used to achieve free shaping, then production of varied three-dimensional shapes is enabled, but the suspension becomes unstable with ceramic particles settling, blocking nozzles, and preventing uniform deposition
Solution Approach 1:
The patent introduces a specifically formulated binding agent as an intermediary substance between ceramic particles and water. This binding agent creates a stable suspension medium that prevents particle settling and nozzle blocking while enabling uniform deposition during inkjet printing, resolving the stability issue without compromising free shaping capability
Solution Approach 2:
The patent optimizes suspension parameters including particle size distribution, binding agent concentration, and pH level to achieve stable suspension. By carefully controlling these parameters, the suspension remains stable during storage and printing operations while still allowing precise inkjet deposition of ceramic layers
3Productivity
If high concentration of ceramic particles (50-80% by weight) is used in the suspension to improve efficiency, then material deposition is more efficient, but particle settling increases and uniformity of deposition is compromised
Solution Approach 1:
The binding agent serves as a mediator that enables high ceramic particle concentration (50-80% by weight) while maintaining suspension stability. It provides steric and/or electrostatic stabilization that prevents particle aggregation and settling even at high concentrations, allowing efficient material deposition with uniform layer formation
Solution Approach 2:
The patent creates a composite suspension system combining ceramic particles, water, and binding agent in optimized ratios. This composite formulation achieves high solids content (50-80% ceramic particles) while maintaining fluidity and stability required for inkjet printing, resolving the contradiction between deposition efficiency and uniformity
4Strength
If pyrolysis and sintering are performed to remove organics and densify the ceramic, then mechanical strength is improved, but dimensional accuracy and uniform density are compromised due to prior particle settling and non-uniform deposition
Solution Approach 1:
The patent performs preliminary stabilization of the ceramic particle suspension before printing, ensuring uniform particle distribution throughout the printing process. This preliminary action prevents settling during deposition, so that when pyrolysis and sintering are subsequently performed, the ceramic body maintains dimensional accuracy and uniform density while achieving high mechanical strength
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 process enables the production of ceramic bodies with high dimensional accuracy and uniform mechanical properties, suitable for medical prostheses, without voids or layer detachment, and allows for complex shapes with precise fitting and joining.
Implementation Method 1
a suspension comprising from 50 to 80% by weight of ceramic particles in a dispersion medium comprising an aqueous boehmite sol
Implementation Method 2
aqueous boehmite sol
Implementation Method 3
layerwise printing of a suspension comprising the constituents required for formation of the shaped ceramic bodies by means of an inkjet printer
Implementation Method 4
drying and hardening of the layer composite formed
Implementation Method 5
The ZrO2 ceramic particles are subsequently sintered
Data Source
AI summary
A process for producing three-dimensional shaped ceramic bodies by layerwise printing of a suspension comprising the constituents required for formation of the shaped ceramic bodies by means of an inkjet printer in the desired two-dimensional shape onto a support material, drying and hardening of the layer composite formed, which is characterized in that printing is effected using a suspension comprising from 50 to 80% by weight of ceramic particles in a dispersion medium comprising an aqueous boehmite sol, at least one low molecular weight alcohol, at least one drying inhibitor and at least one organic fluidizer, and also an apparatus for carrying out this process are described.