Laser Concrete Surface Scanning to Suppress Vitrification
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Solution Overview
Problem
Laser surface processing of concrete often results in vitrification due to heat from silicon-based components like quartz, which is exacerbated by high-speed processing, making it difficult to achieve efficient and high-quality surface roughening without thermal shock.
Innovation Solution
A surface processing method where the concrete surface is irradiated with a laser beam using a scanning pattern with an overlap ratio of 90% or less, combined with high-speed movement and high power density, to prevent vitrification by minimizing surface temperature rise and ensuring efficient energy application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed laser processing is performed on concrete surface, then processing efficiency is improved, but vitrification of silicon-based components occurs due to heat accumulation
Solution Approach 1:
The patent employs pulsed laser irradiation instead of continuous wave laser, applying periodic action to the concrete surface. The pulse duration is controlled to be 10 μs or less, with a duty cycle of 1% or less, allowing the surface to cool between pulses and preventing heat accumulation that causes vitrification, while still achieving high-speed processing through rapid pulse repetition
Solution Approach 2:
The patent uses extremely short pulse durations (10 μs or less) to deliver the laser energy so quickly that the heat does not have time to diffuse and cause vitrification. This 'rushing through' approach allows the laser to ablate the concrete surface before thermal diffusion can occur, maintaining high processing speed without the harmful thermal effects
2Object-affected harmful factors
If pulsed laser with high energy density is used for short irradiation time, then vitrification is suppressed, but processing speed is reduced
Solution Approach 1:
The patent achieves continuous effective processing by rapidly repeating short pulses. The pulse repetition frequency is controlled so that the interval between pulses allows surface cooling (preventing vitrification) while the cumulative effect of multiple pulses maintains high material removal rates. This creates a continuous useful action that combines the benefits of short pulses with high processing speed
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
This method effectively suppresses vitrification during high-speed processing, achieving a well-processed concrete surface with reduced re-solidification and improved surface quality, allowing for efficient surface roughening and peeling.
Implementation Method 1
it is described that a pulse laser is applied to a concrete surface and fine parts are peeled by thermal shock
Implementation Method 2
a silicon-based component such as quartz in concrete is melted by irradiation heat, re-solidified, and vitrified
Data Source
AI summary
Disclosed is a way of providing a surface processing method for concrete in which vitrifying is suppressed even when high-speed processing is performed. In a surface processing method of concrete, a surface of the concrete is irradiated with a laser beam so that a beam spot is scanned along a predetermined scanning pattern and the scanning pattern moves along the surface at a predetermined feed speed. When the beam spot repeatedly passes through a predetermined portion in the scanning pattern, an overlap ratio, which is a ratio of overlapping of a passage path of the beam spot over a passage path of the beam spot in an immediately preceding irradiation, is 90% or less.