Razor Blade Coating Hardness via Titanium Boron PVD
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Solution Overview
Problem
Developing a razor blade coating that enhances cutting properties and durability while being compatible with high-throughput industrial manufacturing and maintaining uniformity is challenging due to the complex geometry of razor blade substrates and subjective quality measurements.
Innovation Solution
A razor blade with a strengthening nanocrystalline coating made of a mixture of titanium and boron, featuring areas with varying proportions of titanium and boron atoms, deposited in a way that provides enhanced hardness and manufacturability, including a titanium-rich and boron-rich composition with a hexagonal lattice arrangement, and a specific thickness range to ensure reliable performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a strengthening coating is deposited on the razor blade substrate to enhance cutting properties and durability, then the hardness and strength of the blade edge is improved, but the complexity of the coating process increases due to the peculiar geometry of the substrate edge
Solution Approach 1:
The patent applies parameter changes by modifying the coating composition (using chromium and carbon in specific proportions) and deposition parameters (temperature, pressure, deposition rate) to achieve a coating that adheres well to the complex substrate geometry while providing enhanced strength and hardness
Solution Approach 2:
The patent uses composite materials by creating a strengthening coating that is a composite of chromium and carbon elements, forming a durable and hard coating structure that combines the benefits of both materials on the razor blade substrate
2Strength
If a new coating material is deposited on the razor blade to improve cutting properties, then the coating hardness is increased, but the uniformity of coating application becomes more difficult to achieve across millions of parts per day
Solution Approach 1:
The patent controls deposition parameters such as temperature, pressure, and deposition rate to ensure uniform coating application across all blades while maintaining the desired hardness properties of the chromium-carbon coating
Solution Approach 2:
The patent employs a vapor deposition process that replaces mechanical coating methods, allowing for more uniform and controlled coating application across the blade surface at high production speeds
3Shape
If the razor blade substrate edge has a very peculiar geometry, then the blade can achieve sharp cutting edges, but depositing a suitable coating on it becomes extremely difficult
Solution Approach 1:
The patent modifies deposition parameters including temperature, pressure, and deposition rate to enable successful coating application on the peculiar substrate geometry, ensuring the coating conforms to the sharp edge profile
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 titanium and boron coating significantly increases the hardness of the razor blade, improves cutting performance, and extends its usability, with a 90% decrease in edge damage compared to standard production blades, allowing for thinner blade profiles and improved shaving fluidity.
Implementation Method 1
a strengthening coating deposited on the razor blade substrate at least at the blade edge portion
Implementation Method 2
the strengthening coating includes a strengthening nanocrystalline layer made of a mixture of titanium and boron including at least one of titanium-rich areas and boron-rich areas
Data Source
AI summary
A razor blade substrate having a substrate that includes a blade edge portion having a profiled geometry which is covered by a strengthening coating deposited on the razor blade substrate at least at the blade edge portion. The strengthening coating covering the blade edge tip, having a profiled geometry and having a tapering geometry with two coating sides converge toward a blade edge tip. The strengthening coating includes a strengthening layer made of a titanium- and boron-containing material.