Bonded Abrasive Composition With Safer Controlled Porosity
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Solution Overview
Problem
The use of naphthalene as a pore former in bonded abrasive articles is limited due to its toxicity, flammability, and environmental concerns, necessitating a safer and environmentally benign alternative that maintains process control and induces desired porosity in abrasive articles.
Innovation Solution
Incorporation of environmentally benign pore inducing materials such as benzophenone, benzoic acid, or saturated fatty acids (lauric, myristic, and palmitic acids) into the bondable abrasive composition, which are non-flammable, have high LD50 values, and are completely removed during the manufacturing process without residue, thereby inducing controlled porosity in the abrasive articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If naphthalene is used as a pore former in bonded abrasive articles, then desired porosity and process control are achieved, but toxicity, flammability, and environmental harm increase
Solution Approach 1:
The patent uses temporary pore-inducing materials (such as organic compounds that decompose or volatile materials) that are completely removed after serving their pore-forming function during manufacturing. These materials are disposable in the sense that they fulfill their purpose temporarily and are then eliminated, leaving no harmful residue in the final product. This resolves the contradiction by achieving porosity control without retaining toxic substances in the finished abrasive article.
Solution Approach 2:
The patent changes the physical and chemical parameters of the pore-forming material by selecting substances with specific properties: low decomposition temperature, high volatility, and complete removability. By adjusting these parameters, the patent achieves effective porosity induction during manufacturing while ensuring the material is completely removed afterward, eliminating toxicity and environmental harm concerns associated with permanent presence of naphthalene.
2Manufacturing precision
If ground shells, wood particles, and polymeric materials are used as temporary pore inducing materials, then porosity is induced, but supply variability and spring-back issues occur
Solution Approach 1:
The patent changes the material selection criteria by specifying precise physical and chemical parameters: uniform particle size distribution, controlled decomposition temperature, and minimal elastic recovery. These parameter changes ensure consistent porosity induction while eliminating supply variability and spring-back problems. The selected materials maintain stable composition and geometry throughout the manufacturing process.
Solution Approach 2:
The patent employs temporary pore-inducing materials that are completely removed after manufacturing, avoiding the long-term stability issues of permanent materials like ground shells and wood particles. These disposable materials provide consistent porosity during the process and are then eliminated, preventing supply variability and geometric instability in the final product.
3Manufacturing precision
If cork, ground walnut shells, and wood particles are used as pore inducing components, then porosity is created, but open fire safety concerns arise in kiln processing
Solution Approach 1:
The patent changes the thermal properties of the pore-forming material by selecting substances with decomposition temperatures well below the kiln firing temperature. This parameter change ensures that the materials decompose completely before reaching combustion conditions, creating porosity safely without posing fire hazards during kiln processing. The selected materials undergo controlled decomposition rather than combustion.
Solution Approach 2:
The patent uses temporary pore-inducing materials that completely decompose or volatilize during the manufacturing process, leaving no combustible residue. These disposable materials fulfill their porosity-creation function and are then completely eliminated, eliminating fire safety concerns that would otherwise persist with permanent organic materials like cork and wood particles.
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 new pore forming compounds ensure consistent porosity and geometry in abrasive articles, offering improved safety and environmental compliance while maintaining manufacturing efficiency and performance.
Implementation Method 1
heating the precursor abrasive structure to a temperature sufficient to effectuate sublimation and/or melt and evaporate the pore inducing material
Implementation Method 2
heating the precursor abrasive structure to a temperature sufficient to effectuate sublimation and/or melt and evaporate the pore inducing material
Implementation Method 3
heating the precursor abrasive structure to a temperature sufficient to effectuate sublimation and/or melt and evaporate the pore inducing material
Implementation Method 4
With vitrified bonded abrasive articles, such as vitrified grinding wheels, a vitreous binder medium or system is used to bond the abrasive particles together. These bonds are usually vitrified at temperatures between 500 °C to 1500 °C.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3G
AI summary
A precursor abrasive structure for use in forming a bonded abrasive article, the precursor abrasive structure including: abrasive particles; a binder medium; and a pore inducing material, wherein the pore inducing material is not flammable and is substantially insoluble in water.