Chipping-Proof Inorganic Solid-State Material Surface Structure
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Solution Overview
Problem
Nonmetal inorganic solid-state materials, such as diamond and tungsten carbide, are prone to cracking and chipping due to stress concentration at surface scratches, and existing techniques to improve their strength are limited in applicability and effectiveness.
Innovation Solution
A chipping-proof nonmetal inorganic solid-state material is developed with a surface structure featuring a network of recesses and protuberances, where the protuberances have an average width of 5 nm to 50 nm and exhibit different physical properties than the interior, with no solid-solid interface, allowing for elastic or plastic deformation and reduced stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical polishing is used to planarize the surface, then scratches are removed, but scratches larger than the abrasive grain remain and stress concentration still occurs
Solution Approach 1:
The invention applies local quality by creating a surface structure with protuberances having specific physical properties (lower Young's modulus, density, or hardness) that differ from the bulk material. These localized regions with different mechanical properties can deform under impact to relieve stress concentration, while the overall surface remains flat and smooth without scratches larger than the abrasive grain.
2Reliability
If thermochemical polishing is used to remove micro cracks, then surface defects are reduced, but the technique cannot be applied to materials other than diamond
Solution Approach 1:
The invention achieves universality by developing a surface structure formation method that can be applied to various nonmetal inorganic solid-state materials (diamond, cubic boron nitride, tungsten carbide, glass, silicon) through irradiation with a gas cluster ion beam. This single technique provides chip resistance across multiple materials by creating the universal surface structure of recesses and protuberances with appropriate physical property gradients.
3Reliability
If fiber-reinforced ceramics are used, then brittle fracture is prevented, but the structure becomes complex and manufacturing becomes difficult
Solution Approach 1:
The invention applies porous materials principle by creating a surface structure with recesses and protuberances that form a network-like porous configuration. This porous surface structure can deform under impact to prevent brittle fracture, while the porosity is confined to the surface layer, keeping the overall structure relatively simple and avoiding the complexity of fiber-reinforced ceramics.
4Reliability
If a compressive stress is produced in the glass surface through ion exchange, then scratch extension is prevented, but the technique is restricted to glass materials
Solution Approach 1:
The invention replaces chemical reinforcement methods (ion exchange) with a physical method using gas cluster ion beam irradiation. This substitution allows the same surface structure formation to be applied to multiple nonmetal inorganic solid-state materials beyond just glass, achieving both scratch resistance and material versatility through a unified physical processing approach.
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 surface structure effectively alleviates stress concentration, significantly reducing the likelihood of cracking or chipping when subjected to impacts, and can be applied to various inorganic solid-state materials, including diamond and tungsten carbide, enhancing their durability.
Implementation Method 1
a surface structure in which a network of recesses and protuberances surrounded by the recesses are formed
Implementation Method 2
each of the protuberances has a physical property of readily deforming at least either elastically or plastically
Implementation Method 3
each of the protuberances has a physical property of readily deforming at least either elastically or plastically
Data Source
AI summary
A chipping-proof nonmetal inorganic solid-state material is characterized in that the inorganic solid-state material has, in at least a part of a surface thereof, a surface structure in which a network of recesses and protuberances surrounded by the recesses are formed, the protuberances have an average width of 5 nm to 50 nm, a physical property of the surface structure differs from the physical property of an interior of the inorganic solid-state material lying below the surface structure, and there is no solid-solid interface between the surface structure and the interior of the inorganic solid-state material.