Bonded Abrasive Article with Transition Metal Nitride Interface
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Solution Overview
Problem
Conventional bonded abrasives with vitrified bonds suffer from mechanical instability and reduced effectiveness due to insufficient bonding between the abrasive grains and the bond matrix, leading to premature grain removal during grinding or polishing processes.
Innovation Solution
A bonded abrasive article featuring cubic boron nitride abrasive grains embedded in a silicate-based bond matrix with a reaction product of transition metal oxide compounds transforming into transition metal nitrides at the interface, enhancing the bonding strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional vitrified bond materials are used, then the abrasive grains can be fixed in the bond matrix, but the bond between the bond matrix and abrasive grains is insufficient causing easy grain removal
Solution Approach 1:
The patent changes the chemical composition parameters of the bond matrix by incorporating specific metal oxides (TiO2, ZrO2, HfO2) in controlled amounts (1-20 wt%, 1-15 wt%, 1-10 wt% respectively) to enable formation of strong chemical bonds with abrasive grains, transforming the bond mechanism from physical adhesion to chemical bonding
Solution Approach 2:
The patent creates a composite bond matrix system combining glass powder (60-95 wt%) with metal oxide additives (5-30 wt% total), forming a heterogeneous material that provides both the structural properties of glass and the bonding capabilities of metal oxides, resulting in enhanced grain retention
2Strength
If the bond matrix is made of amorphous glass material, then the abrasive grains can be held together, but the mechanical stability and strength are limited
Solution Approach 1:
The patent modifies the physical and chemical parameters of the bond matrix through controlled sintering at elevated temperatures (1000-1500°C), which induces partial crystallization and densification of the glass matrix, thereby enhancing mechanical strength while maintaining compositional stability
Solution Approach 2:
The patent utilizes the phase transition of glass from amorphous to partially crystalline structure during sintering, where the metal oxides facilitate nucleation and growth of crystalline phases within the glass matrix, improving mechanical properties while maintaining overall structural integrity
3Duration of action of stationary object
If traditional bond materials are used, then the abrasive article can be manufactured, but the operational lifetime is reduced due to premature grain removal
Solution Approach 1:
The patent introduces metal oxides (TiO2, ZrO2, HfO2) as intermediary substances that form transition metal nitrides at the interface between abrasive grains and bond matrix during sintering in nitrogen atmosphere, creating a protective intermediate layer that strengthens the grain-bond interface and prevents premature grain removal
Solution Approach 2:
The patent creates a composite interface structure consisting of glass matrix, metal oxide particles, and transition metal nitride phases, where each component contributes specific properties: glass provides structural continuity, metal oxides provide bonding sites, and nitrides provide strong chemical bonds with abrasive grains, collectively extending operational lifetime
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 significantly improves the mechanical stability, modulus of elasticity, modulus of rupture, and hardness of the bonded abrasive articles, resulting in extended operational lifetime and enhanced grinding performance compared to conventional bonded abrasives.
Implementation Method 1
at the transformation temperature the transition metal oxide compound changes to a transition metal nitride compound at the interface of the abrasive grains and the vitreous bond matrix
Implementation Method 2
sintering the green article at a transformation temperature to form abrasive grains in a vitreous bond matrix
Data Source
AI summary
A bonded abrasive article is provided which includes abrasive grains made of cubic boron nitride within a bond matrix including a silicate. The bonded abrasive further includes a reaction product at the interface between the abrasive grains and bond matrix comprising a transition metal nitride.