Zirconia Ceramic Surface Microstructures Without Thermal Damage
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Solution Overview
Problem
Current methods for forming periodic microstructures on zirconia-based ceramics face challenges such as thermal adverse effects, impurity doping, and difficulty in creating submicron-sized structures, which affect adhesion and mechanical properties, especially when using laser irradiation techniques that can cause phase transitions and cracking.
Innovation Solution
A surface structure forming method using linearly or circularly polarized ultrashort pulsed-laser beams to create stripe-pattern or mesh-like periodic microstructures on tetragonal-zirconia-based ceramics, avoiding phase transitions and improving adhesion and mechanical strength by controlling laser parameters like fluence and polarization direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional laser irradiation is used to form periodic microstructures on zirconia-based ceramics, then surface adhesion is improved, but thermal adverse effects and phase transitions occur causing cracking
Solution Approach 1:
The patent applies parameter changes by using ultrashort pulsed laser irradiation with specific fluence ranges (1.5-5.0 J/cm²) and pulse durations (100 fs to 10 ps) to form periodic microstructures on zirconia-based ceramics without causing thermal damage or phase transitions, thereby improving surface adhesion while avoiding harmful thermal effects
Solution Approach 2:
The patent employs periodic action by irradiating the laser beam multiple times (10-300 shots) at the same region with overlapping scans to self-organize periodic structures on the material surface, creating fine irregularities that enhance adhesion without thermal damage
2Strength
If mechanical processing is used to create surface microstructures on zirconia-based ceramics, then adhesion is improved, but the material's toughness and hardness are compromised
Solution Approach 1:
The patent replaces mechanical processing methods with ultrashort pulsed laser irradiation to form periodic microstructures on zirconia-based ceramics, thereby improving surface adhesion while preserving the material's inherent toughness, hardness, and structural integrity without mechanical compromise
3Area of stationary object
If chemical etching is used to form microstructures on zirconia-based ceramics, then surface area is increased for better adhesion, but impurity doping occurs
Solution Approach 1:
The patent replaces chemical etching with ultrashort pulsed laser irradiation to form periodic microstructures on zirconia-based ceramics, increasing effective surface area for improved adhesion while avoiding impurity doping and chemical contamination
Solution Approach 2:
The patent uses controlled laser parameters including fluence (1.5-5.0 J/cm²), pulse duration (100 fs to 10 ps), and number of shots (10-300) to create periodic microstructures that increase surface area without chemical contamination
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 successfully forms submicron to micron-sized periodic microstructures on zirconia-based ceramics with improved adhesion and mechanical properties, enhancing the compatibility and functionality of zirconia-based ceramics for biomedical and industrial applications without causing thermal damage.
Implementation Method 1
irradiating a linearly polarized ultrashort pulsed-laser beam to the ceramic surface, and forming stripe-pattern irregularities parallel to a direction of polarization of the linearly polarized light in a spot of the laser beam
Data Source
AI summary
Provided herein is a method for forming a periodic microstructure on a surface of zirconia-based ceramics, which are not easily mechanically workable, without causing thermal adverse effects. A zirconia-based ceramic having a surface periodic microstructure is also provided. A linearly or circularly polarized laser beam is irradiated to a zirconia-based ceramic surface, and periodic irregularities are formed in a spot of the laser beam. Stripe-pattern irregularities parallel to the direction of polarization can be formed in a spot of a laser beam by irradiating a linearly polarized ultrashort pulsed-laser beam to a zirconia-based ceramic surface. A mesh-like raised region and a dot-like recessed region can be periodically formed by irradiating a circularly polarized ultrashort pulsed-laser beam to a ceramic surface.