Abrasive Grain Coating with Low-Temperature Silicate Binder

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Solution Overview

Problem

Existing methods for coating abrasive grains with binders to enhance their integration in abrasives often require high temperatures, which are unsuitable for temperature-sensitive grains, and result in weak bond stability, especially for thermally unstable materials like eutectic zirconium aluminum oxide.

Innovation Solution

A binder system comprising reactive Al2O3 and SiO2, with a molar ratio of 1:2 to 1:20, including sodium silicate, water, and a complex alkaline fluoride, is used to create a viscous silicate phase that forms a strong, stable coating at temperatures below 400°C, allowing for improved adhesion of micro-particle inorganic powders and pigments on abrasive grains.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If high temperature heat treatment is used to solidify the binder and coat abrasive grains, then the bond strength between coating and abrasive grain is improved, but temperature-sensitive abrasive grains (such as eutectic zirconium aluminum oxide, cubic boron nitride, and diamond) are damaged or excluded from coating

Engineering Contradiction:

Improvebond strengthVSAvoidthermal damage to abrasive grains

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The invention changes the temperature parameter from high temperature (1350-1500°F for glass frit) to low temperature (below 400°C) by using a binder system based on colloidal silicon dioxide and reactive metal oxides that can form strong bonds at lower temperatures, thereby protecting temperature-sensitive abrasive grains while achieving adequate bond strength

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite binder system combining colloidal silicon dioxide with reactive metal oxides (such as Al2O3, SiO2, TiO2, ZrO2, Fe2O3, MnO2, PbO, B2O3, and their combinations) that creates a synergistic effect, enabling strong adhesion at low temperatures without damaging the abrasive grains

Inventive Principle:

Principle #40Composite materials

2Strength

If conventional silica-based binders (sodium silicate or colloidal silicon dioxide) are used requiring high temperatures for solidification, then the coating can be firmly bonded, but relatively high energy consumption is required and temperature-sensitive abrasive grains are excluded

Engineering Contradiction:

Improvecoating bond stabilityVSAvoidenergy consumption

Core Design Contradiction:

StrengthVSUse of energy by moving object

Solution Approach 1:

The invention changes the processing temperature parameter from high temperature to low temperature (below 400°C) by selecting binder materials with lower reaction temperatures, thereby reducing energy consumption while maintaining coating bond stability through the reactive metal oxide components

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the abrasive grain surface is roughened by applying micro-particle pigments or powder with high-temperature binders, then the integration of abrasive grain in the abrasive is improved, but the treatment is not suitable for oxidation-sensitive and temperature-sensitive abrasive grains

Engineering Contradiction:

Improveintegration of abrasive grainVSAvoidapplicability to different abrasive grain types

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The invention creates a universal coating method that works for all abrasive grain types including temperature-sensitive and oxidation-sensitive materials by using a low-temperature binder system that does not require high heat treatment, making the process adaptable to diverse abrasive materials

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention changes the temperature parameter to enable coating of oxidation-sensitive grains by avoiding high-temperature oxidizing environments, thus expanding the range of applicable abrasive grain types

Inventive Principle:

Principle #35Parameter changes

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 binder system achieves a significantly stronger bond between the abrasive grains and the coating, enhancing grinding performance and stability, even for thermally unstable grains, with reduced energy consumption and no damage to temperature-sensitive materials.

Implementation Method 1

Methodology Applied

Scientific EffectViscous silicate phase formation:

Implementation Method 2

The binder system achieves a significantly stronger bond between the abrasive grains and the coating, enhancing grinding performance and stability

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS8864862B2Coated abrasive grains, method and for the production thereof as well as the use thereof for producing abrasives

Publication Date: 2014.10.21 IMERTECH SAS

AI summary

The present invention relates to abrasive grains, which are coated with a micro-particle inorganic powder and a binder, consisting of the group of conventional abrasive grains as well as the group of the “superabrasives”, wherein the binder comprises an aluminosilicate with a molar ratio of Al2O3 to SiO2 of 1:2 to 1:20 as well as at least one complex alkaline fluoride. The particular advantage of this coating is that the binder can already be completely hardened at below 400° C. The invention also relates to a method for producing such abrasive grains as well as to the use thereof for producing abrasives.