Vitrified Bond Abrasive with Low Phosphorous Oxide
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Solution Overview
Problem
High-temperature forming processes for bonded abrasive tools using vitrified bond materials can damage microcrystalline alumina (MCA) abrasive grains, leading to reduced sharpness and performance, necessitating the development of bond compositions that can form at lower temperatures while maintaining abrasive integrity.
Innovation Solution
A bonded abrasive article is formed using a bond material powder with specific compositions, including high silica content and controlled alkali and alkaline earth oxide levels, which allows for high-temperature forming without severe degradation of MCA grains, utilizing a process that involves mixing MCA or sol-gel alumina grains with a bond material, pressing, and firing at temperatures up to 1300°C to create a vitrified bond with an amorphous phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high temperature forming processes (1000°C or greater) are used to form bonded abrasive tools with vitrified bond material, then the bond material forms properly, but the abrasive grains suffer degradation including reduced sharpness and performance
Solution Approach 1:
The patent modifies the chemical composition parameters of the bond material by incorporating specific amounts of metal oxides (0.1-5.0 wt% of at least one metal oxide selected from group VIIIb transition metals, 0.1-3.0 wt% of at least one metal oxide selected from groups IVb-VIb transition metals, and 0.1-2.0 wt% of at least one rare earth metal oxide). These compositional changes enable the bond material to form properly at reduced temperatures while maintaining abrasive grain integrity.
Solution Approach 2:
The patent creates a composite bond material system that combines traditional vitrified bond components with specific metal oxide additives. This composite formulation allows the bond to achieve proper forming characteristics at lower temperatures without compromising the abrasive grains, effectively resolving the contradiction between forming temperature and grain integrity.
2Reliability
If the formation temperature is reduced to protect abrasive grains, then grain degradation is minimized, but the bond material may not form properly
Solution Approach 1:
The patent adjusts multiple compositional parameters simultaneously - including the specific ranges of metal oxides from different periodic table groups, rare earth metal oxides, and their interactions - to create a bond material that maintains proper forming characteristics at reduced temperatures while protecting abrasive grains from degradation.
3Reliability
If conventional bond compositions are used at reduced temperatures, then grain degradation is reduced, but grinding performance and power consumption are not optimized
Solution Approach 1:
The patent optimizes the specific composition parameters of metal oxides (group VIIIb: 0.1-5.0 wt%, groups IVb-VIb: 0.1-3.0 wt%, rare earth: 0.1-2.0 wt%) to achieve a balance that maintains abrasive grain integrity while optimizing grinding performance and reducing power consumption during material removal operations.
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 approach results in abrasive articles with improved integrity and performance, demonstrated by reduced power consumption and maintained surface finish during grinding operations, even at high material removal rates, without significant grain degradation.
Implementation Method 1
firing at temperatures up to 1300°C to create a vitrified bond with an amorphous phase
Implementation Method 2
mixing MCA or sol-gel alumina grains with a bond material, pressing, and firing at temperatures up to 1300°C to create a vitrified bond
Data Source
Figure 1
Figure 2~3
AI summary
An abrasive article having an abrasive body including abrasive grains contained within a bond material, wherein the abrasive grains comprise microcrystalline alumina, and wherein the bond material includes less than about 1.0 mol% phosphorous oxide (P2O5), and a ratio measured in mol% between a total content of sodium oxide (Na2O) and a total content of potassium oxide (K2O) defined by [K2O/Na2O] having a value greater than about 0.5.