Measuring Adhesive Strength of Porous Protection Layers
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Solution Overview
Problem
The Sebastian method for measuring adhesive strength of porous protection layers in gas sensor elements exhibits significant variation due to adhesive permeation into pores, leading to inconsistent results.
Innovation Solution
A method involving a peeling jig and holding jig setup where the element body is moved relative to the peeling jig, preventing the porous protection layer from moving, allowing the peeling jig to push it off and measure adhesive strength without adhesive, with specific jig designs and speed controls to minimize variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Sebastian method is used to measure adhesive strength of porous protection layer, then the measurement can be performed, but the measured adhesive strength shows wide variation due to adhesive permeation into pores
Solution Approach 1:
The invention extracts and eliminates the adhesive from the measurement system. Instead of using adhesive to bond the stud pin to the porous protection layer (as in the Sebastian method), the invention directly applies load to the porous protection layer through a specially designed loading fixture that contacts the layer without adhesive, thereby removing the source of measurement variation caused by adhesive permeation into pores
Solution Approach 2:
The invention introduces a loading fixture as an intermediary between the testing machine and the porous protection layer. This fixture directly transmits load to the porous protection layer without requiring adhesive bonding, serving as a mediator that eliminates the adhesive-permeation problem while enabling force application for measurement
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 reduces the variation in measured adhesive strength by eliminating adhesive-related variability and ensuring consistent peeling, providing more accurate results.
Implementation Method 1
holding a portion of the element body where the porous protection layer is absent with an elastic force exerted by a holding jig
Data Source
AI summary
A method of measuring adhesive strength between an element body and a porous protection layer that are included in a sensor element includes (a) a step of holding a portion of the element body where the porous protection layer is absent with an elastic force exerted by a holding jig, and placing a peeling jig at a position between the porous protection layer and the holding jig in the longitudinal direction such that the element body is allowed to move in the longitudinal direction while the porous protection layer is prevented from moving in the longitudinal direction toward the holding jig; and (b) a step of moving, after the step (a), the peeling jig pushes the porous protection layer in the longitudinal direction, and measuring the adhesive strength of the porous protection layer.