Boron Nitride Agglomerates Preferred Orientation
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Solution Overview
Problem
Existing methods for producing boron nitride agglomerates as fillers for polymers result in low density and high cost, with unoriented lamellar particles limiting thermal conductivity and processing properties, and require expensive and laborious processes such as hot pressing and multiple steps of compaction and comminution.
Innovation Solution
The production of boron nitride agglomerates with preferred orientation, also known as textured agglomerates, which are flake-shaped and have high density and mechanical stability, utilizing a method that involves compacting boron nitride powder between counterrotating rolls to align the lamellar particles parallel to each other, allowing for higher thermal conductivity and improved processing properties without the need for binders or multiple processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional methods (spray granulation, pelletization) are used to produce boron nitride agglomerates, then processing properties improve, but density remains low and production cost increases
Solution Approach 1:
The invention applies preliminary action by pre-aligning the lamellar particles in a preferred orientation during the granulation process itself, rather than requiring subsequent alignment steps. The granulation process is designed to inherently produce oriented agglomerates, eliminating the need for expensive post-processing alignment operations while achieving both good processing properties and high density
Solution Approach 2:
The invention extracts and eliminates the need for binders from the conventional granulation process. By using a binder-free granulation method, the patent avoids the complexity and cost associated with binder addition, mixing, and drying steps, while still achieving adequate agglomeration and oriented structure through mechanical granulation alone
2Ease of manufacture
If lamellar particles are unoriented in agglomerates, then production is simpler, but thermal conductivity is limited
Solution Approach 1:
The invention performs preliminary orientation of lamellar particles during the granulation process itself. By designing the granulation mechanism to align particles as they are being agglomerated, the patent achieves preferred orientation without requiring separate, complex post-processing alignment steps, thus maintaining production simplicity while enhancing thermal conductivity
Solution Approach 2:
The invention changes the orientation parameter of the lamellar particles from random to preferred alignment during granulation. By controlling the granulation conditions to promote particle alignment, the patent transforms the orientation state of particles, thereby significantly improving thermal conductivity in the plane of the agglomerates
3Quantity of substance
If hot pressing and multiple compaction/comminution steps are used, then density increases, but production cost and labor increase significantly
Solution Approach 1:
The invention performs preliminary densification and orientation during the granulation step itself. By designing the granulation process to simultaneously achieve particle alignment, agglomeration, and density increase, the patent eliminates the need for subsequent hot pressing and multiple compaction-comminution cycles, dramatically simplifying the production process while maintaining high density
Solution Approach 2:
The invention merges multiple functions into the single granulation step: particle alignment, agglomeration, and densification are all achieved simultaneously during granulation. This consolidation of operations eliminates the need for separate hot pressing and compaction-comminution steps, reducing both process complexity and production cost while achieving the desired density
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 textured agglomerates achieve higher thermal conductivity values both in-plane and through-plane, with improved mechanical stability and reduced production costs, enabling efficient use as fillers in polymers and sintered compacts while maintaining high density and anisotropic properties.
Implementation Method 1
compacting boron nitride powder between counterrotating rolls to align the lamellar particles parallel to each other
Implementation Method 2
The thermal conductivity of hexagonal boron nitride is greater in the plane of the lamella (a-axis) than perpendicular to it (c-axis)... the textured agglomerates achieve higher thermal conductivity values both in-plane and through-plane
Data Source
AI summary
The invention relates to boron nitride agglomerates, comprising lamellar, hexagonal boron nitride primary particles, which are agglomerated with one another with a preferred orientation, the agglomerates formed being flake-shaped.The invention also relates to a method for producing said boron nitride agglomerates, characterized in that lamellar, hexagonal boron nitride primary particles are agglomerated in such a way that they line up with one another with a preferred orientation.The flake-shaped agglomerates according to the invention are suitable as filler for polymers for making polymer-boron nitride composites and for hot pressing of boron nitride sintered compacts.