Wire-Shaped Grinding Element Composition Against Brittle Collapse
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Solution Overview
Problem
Existing wire-shaped grinding elements for polishing brushes made of resin-impregnated inorganic filaments with mullite crystals are prone to brittle collapse due to intermittent impacts during polishing, leading to reduced wear resistance and uneven grinding.
Innovation Solution
Incorporating inorganic filaments with 80-90% alumina and 20-10% silica components, in an amorphous state, and a BET specific surface area of 30 m2/g or smaller, to prevent brittle collapse and ensure grinding power by inhibiting moisture absorption and resin unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If inorganic filaments with mullite crystals are used to ensure grinding power, then grinding power is improved, but wear resistance deteriorates due to brittle collapse from intermittent impacts
Solution Approach 1:
The patent changes the crystal structure parameter of the inorganic filaments from containing mullite crystals to having an amorphous structure. This parameter change eliminates the brittleness associated with crystalline mullite while maintaining the required grinding power through the amorphous alumina-silica composition, thereby resolving the contradiction between grinding power and wear resistance
Solution Approach 2:
The patent uses a composite material system consisting of amorphous inorganic filaments (alumina-silica composition) combined with resin binder. This composite structure provides both the hardness needed for grinding power and the toughness required for wear resistance against intermittent impacts, resolving the contradiction between these two properties
2Strength
If inorganic filaments with high alumina content (80-90%) are used to ensure hardness, then grinding power is improved, but moisture absorption increases leading to resin curing inhibition
Solution Approach 1:
The patent changes the surface area parameter of the inorganic filaments to a specific range (0.5-5.0 m²/g). This parameter control reduces moisture absorption while maintaining the high alumina content (80-90%) required for hardness, thereby resolving the contradiction between hardness and resin curing uniformity
Solution Approach 2:
The patent applies different properties to different aspects of the inorganic filaments: high alumina content (80-90%) for hardness and low specific surface area (0.5-5.0 m²/g) for moisture resistance. This local quality differentiation allows the material to simultaneously achieve high hardness while preventing moisture-related curing issues
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 solution enhances wear resistance and maintains grinding power by preventing brittle collapse and ensuring hardness, even without mullite crystals, through controlled BET surface area and amorphous silica composition.
Implementation Method 1
the specific surface area of the inorganic filaments of a predetermined value or smaller can stop or prevent the inorganic filaments from absorbing moisture in the air
Data Source
AI summary
A wire-shaped grinding element (10A, 10B) is used as a grinding element for a polishing brush. The wire-shaped grinding element (10A, 10B) includes inorganic filaments and a resin that impregnates the inorganic filaments and is cured. The inorganic filaments contain 80 to 90% by weight of an alumina component and 20 to 10% by weight of a silica component. The crystal structure of the inorganic filaments includes intermediate alumina. The silica component is in an amorphous state. The BET specific surface area of the inorganic filaments is 30 m2/g or smaller.