Al-CBN Composite Sintering for Strength and Corrosion Resistance

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Solution Overview

Problem

Existing aluminum-based composites face challenges in achieving an optimal balance of properties for advanced applications, particularly in terms of cost-effectiveness and corrosion resistance, which hinders their widespread industrial adoption.

Innovation Solution

A method is developed to create an aluminum-cubic boron nitride (Al-cBN) composite through mixing aluminum powder and cubic boron nitride particles, sonicating, drying, and sintering under controlled conditions to form a composite with cBN uniformly dispersed in an aluminum matrix, using spark plasma sintering to prevent chemical reactions and maintain mechanical integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If ceramic particles are added to aluminum matrix to increase density and elastic modulus, then mechanical properties are improved, but corrosion resistance deteriorates

Engineering Contradiction:

Improveelastic modulusVSAvoidcorrosion resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the ceramic reinforcement from conventional options (SiC, Al2O3) to boron nitride (BN) with specific crystal structure. This parameter change in material composition provides both high elastic modulus (improving strength) and inherent corrosion resistance, thus resolving the contradiction between mechanical property enhancement and corrosion resistance maintenance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining aluminum matrix with boron nitride ceramic particles. This composite structure leverages the lightweight and ductile properties of aluminum while incorporating the high stiffness and corrosion resistance of BN, achieving both improved elastic modulus and maintained corrosion resistance simultaneously.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional fabrication techniques are used to produce aluminum matrix composites, then production cost is reduced, but manufacturing precision and microstructure control deteriorate

Engineering Contradiction:

Improveproduction costVSAvoidmicrostructure control

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent employs preliminary action by pre-dispersing boron nitride ceramic particles in a liquid medium before introducing them to the aluminum matrix. This pre-dispersion step ensures uniform particle distribution throughout the matrix, achieving fine microstructure control and high manufacturing precision while using conventional fabrication techniques, thus resolving the contradiction between ease of manufacture and manufacturing precision.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If aluminum powder and ceramic particles are mixed without proper dispersion techniques, then manufacturing process is simplified, but uniformity of composite structure deteriorates

Engineering Contradiction:

Improveprocess complexityVSAvoiduniformity of composite structure

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The patent introduces a liquid medium as an intermediary substance to facilitate the mixing and dispersion of boron nitride ceramic particles with aluminum powder. This intermediary liquid enables uniform distribution of particles throughout the matrix during the mixing process, achieving stable and homogeneous composite structure without significantly increasing process complexity, thus resolving the contradiction between device complexity and composition stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 Al-cBN composite achieves improved mechanical properties such as hardness and elastic modulus, along with enhanced corrosion resistance, making it suitable for various industrial applications with reduced corrosion rates and improved durability.

Implementation Method 1

mixing an aluminum powder and particles of cubic boron nitride (cBN) in a solvent and sonicating to form an Al-cBN mixture

Methodology Applied

Scientific EffectSonication: Ultrasonic Vibration

Implementation Method 2

drying the Al-cBN mixture to form a dried mixture powder

Methodology Applied

Scientific EffectDrying: Evaporation

Implementation Method 3

sintering by pressing and heating the dried mixture powder to form the Al-cBN composite

Methodology Applied

Scientific EffectSintering: Sintering

Implementation Method 4

Spark plasma sintering (SPS) may be used to strengthen the composites. The SPS is a non-conventional sintering technique in which materials in the form of powders are subjected to a combination of heat (generated by applying a high direct current) and uniaxial pressure

Methodology Applied

Scientific EffectSpark plasma sintering: Spark Plasma Sintering

Data Source

PatentUS20260055487A1Light weight material containing al-CBN and aluminum

Publication Date: 2026.02.26 KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

AI summary

A method of making an aluminum-cubic boron nitride (Al-cBN) composite includes mixing an aluminum powder and particles of cubic boron nitride (cBN) in a solvent and sonicating to form an Al-cBN mixture; drying the Al-cBN mixture to form a dried mixture powder; and sintering by pressing and heating the dried mixture powder to form the Al-cBN composite. The aluminum powder has an average particle size of 10 to 100 micrometers (μm). The cBN particles have an average particle size of from 10 to 100 μm, and are uniformly dispersed throughout the Al-cBN composite.