Laser-Sintered Ceramic Coating for Low-Melting Metal Supports
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Solution Overview
Problem
Conventional sintering processes, such as firing in an oven, are inefficient and cannot produce ceramic coatings on supports with a melting temperature lower than the coating's softening point, leading to energy wastage and coating adhesion issues, and existing laser-based methods are not effective for sintering discontinuous coatings on deformable substrates.
Innovation Solution
A metal support with a ceramic or metal coating having a softening point higher than the support, featuring a discontinuous layer of solidified drops that absorb laser radiation, allowing for efficient laser sintering without excessive energy consumption, enabling deformation and uniform coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oven sintering is used to produce ceramic coating, then the coating can be consolidated, but the energy consumption is very high and the support material must have a melting temperature higher than the coating softening point
Solution Approach 1:
The patent replaces the conventional thermal field (oven heating) with a localized laser beam field to sinter the ceramic coating. The laser provides concentrated energy directly at the coating location, eliminating the need for bulk heating of the entire support structure, thereby dramatically reducing energy consumption while achieving the same coating consolidation effect
Solution Approach 2:
The invention applies localized heating through laser irradiation only to the ceramic coating layer rather than heating the entire support structure. This localized energy input allows the coating to be sintered without requiring the support material to withstand high temperatures, resolving the temperature compatibility constraint
2Reliability
If conventional oven sintering is used to produce ceramic coating, then the coating can be consolidated, but the process is very time-consuming and inefficient
Solution Approach 1:
The patent replaces the slow, bulk thermal diffusion process of oven sintering with the rapid, localized energy delivery of laser irradiation. The laser beam delivers concentrated energy directly to the coating, achieving sintering in seconds or minutes compared to the hours required for conventional oven processing, thereby dramatically improving production efficiency
Solution Approach 2:
The laser sintering process uses controlled periodic irradiation to progressively sinter the ceramic coating. The laser can be applied in pulses or continuous sweeps, allowing precise control over the sintering timeline and enabling rapid processing compared to the continuous, slow heating of conventional ovens
3Use of energy by moving object
If laser radiation is used to sinter ceramic coating, then energy consumption is reduced, but the coating must contain elements that absorb laser radiation at specific wavelengths
Solution Approach 1:
The patent modifies the chemical composition parameters of the ceramic coating by incorporating specific elements (such as metals or metal oxides) that have high absorption coefficients at the laser wavelength used. This compositional adjustment enables efficient laser energy coupling and sintering, while the added elements are typically minor constituents that do not significantly alter the final coating properties
Solution Approach 2:
The laser-absorbing elements in the coating composition act as intermediaries that convert laser radiation energy into thermal energy. These elements absorb the laser photons and transform the electromagnetic energy into heat, which then conducts through the coating to achieve sintering, effectively mediating the energy transfer from the laser to the ceramic matrix
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 enables the formation of durable, low-energy-consumption ceramic or metal coatings on substrates with low melting points, ensuring strong adhesion and deformation capability, while reducing energy consumption by up to 98% compared to traditional oven sintering.
Implementation Method 1
comprising at least one element absorbing laser radiation at a wavelength of the order of 1 μm... the ceramic or metal coating having a softening point higher than the melting point of the support
Implementation Method 2
as well as a method of manufacturing such an article in which the ceramic coating is sintered by laser radiation
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to an article (1) comprising a metal support (2) with two opposing faces (21, 22), at least one of which is covered by a discontinuous ceramic coating (3). Said coating (3) has a softening point above the melting point of the support (2) and has at least one absorbing element for the laser radiation at a wavelength of the order of 1 μm, being at least 1% of the weight of said coating (3). The invention further relates to a method for producing said article (1).