Nitride Ceramic Scribe Geometry for Clean Breakage and Braze Removal
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Solution Overview
Problem
The existing methods for manufacturing nitride ceramic substrates face challenges in removing brazing material, reducing the appearance of scribe lines in scanning acoustic tomography (SAT), and achieving favorable breakage of the ceramic material.
Innovation Solution
A method involving the formation of a scribe line on a nitride ceramic base material with recessed portions, where the depth of each recessed portion is between 0.70 and 1.10 times the opening width, and the opening width is between 1.00 and 1.10 times the inter-center distance, allowing for effective removal of brazing material and improved breakage characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the depth of recessed portions is increased to improve breakage characteristics, then the breakage becomes more favorable, but the removal of brazing material becomes more difficult
Solution Approach 1:
The patent applies parameter changes by precisely controlling the depth-to-opening-width ratio of recessed portions within 0.70-1.10, and the opening-width-to-inter-center-distance ratio within 1.00-1.10. These specific parameter ranges optimize both the breakage characteristics (by creating sufficient stress concentration) and the removal of brazing material (by maintaining accessible opening widths), thereby resolving the technical contradiction between these two requirements.
2Ease of manufacture
If the opening width of recessed portions is increased to facilitate brazing material removal, then the removal becomes easier, but the appearance of scribe lines in SAT increases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing specific ratio ranges: the opening width-to-inter-center-distance ratio is controlled at 1.00-1.10, and the depth-to-opening-width ratio at 0.70-1.10. These parameter optimizations ensure that the opening width is sufficient for brazing material removal while the inter-center distance remains small enough to minimize SAT appearance, achieving a balance between manufacturability and quality inspection requirements.
3Object-affected harmful factors
If the inter-center distance of recessed portions is decreased to reduce SAT appearance, then the scribe line becomes less visible, but the opening width becomes relatively larger compared to inter-center distance
Solution Approach 1:
The patent applies parameter changes by defining precise ratio ranges for geometric parameters. The opening width-to-inter-center-distance ratio is controlled within 1.00-1.10, ensuring that as inter-center distance decreases for SAT optimization, the opening width scales proportionally to maintain manufacturability. This parameter coordination resolves the contradiction between SAT appearance and manufacturing precision.
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 approach enables favorable removal of brazing material, reduces the appearance of scribe lines in SAT, and ensures effective breakage of the nitride ceramic base material, as demonstrated by specific parameters optimizing the depth, opening width, and inter-center distance of the recessed portions.
Implementation Method 1
forming a scribe line on a first surface of a nitride ceramic base material by a laser
Data Source
AI summary
First, a scribe line (110) is formed on a first surface (102) of a nitride ceramic base material (100) by a laser. Next, the nitride ceramic base material (100) is divided along the scribe line (110) . The scribe line (110) includes a plurality of recessed portions (112). The plurality of recessed portions (112) are formed in a row on the first surface (102) of the nitride ceramic base material (100). A depth (d) of each of the plurality of recessed portions (112) is equal to or greater than 0.70 times and equal to or smaller than 1.10 times an opening width (w) of each of the plurality of recessed portions (112). The opening width (w) of each of the plurality of recessed portions (112) is equal to or greater than 1.00 times and equal to or smaller than 1.10 times an inter-center distance (p) of the plurality of recessed portions (112).