Ceramic Device Surface Activation for Strength and Bioactivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ceramic additive manufacturing faces challenges such as the use of polymer binders leading to non-homogeneity, limited ceramic load, component deformation, and high porosity, along with thermal stresses causing defects and distortions, limiting the application of materials like silicon carbide (SiC) in optical systems due to high melting points and costly manufacturing processes.
Innovation Solution
A method involving alkali treatments to form a gel layer on ceramic surfaces, followed by thermal treatments and exposure to modifying materials, enhances properties like strength, porosity, and bioactivity without using polymer binders, allowing for improved 3D printing and manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer binders are used in ceramic additive manufacturing, then layer-by-layer bonding is achieved, but non-homogeneity, limited ceramic load, component deformation, and high porosity occur
Solution Approach 1:
The patent removes polymer binders from the ceramic additive manufacturing process entirely. Instead of using polymer binders to bond ceramic particles during printing, the invention uses a water-based binder system with ceramic particles that form homogeneous suspensions without polymer contamination, eliminating the source of non-homogeneity and high porosity while maintaining layer-by-layer bonding capability
Solution Approach 2:
The invention changes the binder system parameters from polymer-based to water-based formulations. This parameter change allows for higher ceramic particle loading, improved homogeneity, and reduced porosity while maintaining the ability to bond layers together during additive manufacturing
2Strength
If high energy lasers are used to sinter ceramic particles, then ceramic bonding is achieved, but high melting point challenges and thermal stresses cause defects and distortions
Solution Approach 1:
The patent replaces high energy laser sintering with a water-based binder system that uses chemical adhesion and capillary forces to bond ceramic particles. This substitution eliminates the thermal stresses and melting point challenges associated with laser sintering, thereby preventing defects and distortions while achieving adequate bonding strength
Solution Approach 2:
The invention introduces a water-based binder as an intermediary substance that mediates the bonding between ceramic particles. This binder system provides a controlled, low-temperature bonding mechanism that avoids the extreme thermal conditions of laser sintering, thus preventing thermal stresses and structural defects
3Reliability
If traditional manufacturing methods are used for silicon carbide, then material properties are achieved, but high cost and lead-time for preliminary shaping and optical finishing occur
Solution Approach 1:
The patent applies preliminary action by incorporating optical surface features directly into the additive manufacturing process itself. Instead of requiring separate preliminary shaping and optical finishing operations after manufacturing, the invention enables these features to be formed during the printing process, dramatically reducing manufacturing lead-time while maintaining optical material properties
Solution Approach 2:
The invention achieves multi-functionality by using a single additive manufacturing process to simultaneously create the bulk ceramic structure, preliminary shaping, and optical surface features. This universal approach eliminates the need for multiple separate manufacturing steps, thereby reducing cost and lead-time while achieving the required optical properties
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 results in ceramic devices with enhanced mechanical properties, bioactivity, and biocompatibility, suitable for medical and optical applications, while reducing manufacturing costs and complexities associated with traditional methods.
Implementation Method 1
exposing the ceramic device to an alkali solution to form a gel layer on the surface of the device
Implementation Method 2
thermally treating the ceramic device at about 500-900° C.
Implementation Method 3
thermally treating the ceramic device at about 900-1300° C. during and/or after the exposing to the modifying material
Implementation Method 4
exposing the ceramic device to a modifying material to form a modified surface on the ceramic device
Data Source
AI summary
The present invention relates to methods for preparing ceramic devices having a surface that has been activated to enhance properties including strength, porosity, and bioactivity. Activation may include forming a gel layer on the surface of a ceramic device using an alkali solution and modifying the surface using a modifying material. The invention further relates to ceramic devices prepared by the methods and methods of using the devices.