Bonded Abrasive Composition with Nanocrystalline Alumina Hardness
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Solution Overview
Problem
Existing bonded abrasive articles, such as those with microcrystalline alumina, do not fully meet the industry's demand for improved hardness and grinding performance.
Innovation Solution
The use of nanocrystalline alumina abrasive particles in a bond material, combined with optional additives and a curing process, to form abrasive articles with enhanced properties like increased G-ratio and Vickers hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If microcrystalline alumina is used in bonded abrasive articles, then the articles can be used for cutting and grinding materials, but the hardness and grinding performance do not fully meet industry demands
Solution Approach 1:
The patent changes the crystalline structure parameter of alumina from microcrystalline to nanocrystalline, reducing the average crystallite size to 0.1 microns or less. This parameter change fundamentally alters the material properties, resulting in significantly improved Vickers hardness and grinding performance while maintaining the bonded abrasive article structure
Solution Approach 2:
The patent creates a composite material system combining nanocrystalline alumina particles with bond materials. The unique properties of nanocrystalline alumina (enhanced hardness, microfracturing characteristics) are integrated into the bonded abrasive matrix, producing a composite with superior overall performance compared to conventional microcrystalline alumina-based articles
2Strength
If nanocrystalline alumina with average crystallite size of 0.1 microns or less is used, then Vickers hardness and microfracturing properties are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs preliminary action by pre-synthesizing nanocrystalline alumina particles with controlled crystallite size (0.1 microns or less) before incorporating them into the bonded abrasive matrix. This advance preparation of the abrasive particles with desired nanocrystalline structure simplifies the overall manufacturing process, as the complex nanocrystalline material is produced separately and then integrated into the final product
Data Source
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Figure 6A~6B
AI summary
An abrasive article can include a body including a bond material and abrasive particles contained within the bond material. The abrasive particles can include nanocrystalline alumina. The bond material can include an organic material. In an embodiment, the nanocrystalline alumina may have an average crystallite size of not greater than 1.5 microns. In another embodiment, the bond material and the abrasive particles may be mixed and the mixture may cure to form the abrasive article of embodiments herein.