BAM-B4C Ceramic Composite Armor for Lightweight Ballistic Protection
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Solution Overview
Problem
Current body armor materials face challenges in achieving lightweight, high hardness, and fracture toughness while maintaining ballistic protection, with unpredictable factors affecting their performance, and existing materials often fail to effectively stop multiple high-energy projectiles without significant weight and thickness.
Innovation Solution
A sintered composite material combining boron carbide and AlMgB14 (BAM) ceramics, with up to 80% BAM by weight, formed through processes like Spark Plasma Sintering, which creates a layered structure that enhances fracture toughness and prevents penetration of high-energy projectiles without experiencing shear amorphization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional body armor materials (Al2O3, TiC, SiC) are used to provide hardness and ballistic protection, then the protective performance is improved, but the weight increases significantly
Solution Approach 1:
The patent uses composite materials by combining BAM (AlMgB14) and B4C (boron carbide) ceramics in specific weight ratios (BAM: 20-80 wt%, B4C: 20-80 wt%). This composite approach allows the material to achieve both low density (2.3-2.7 g/cm³) and high hardness (4000-4700 VHN), providing ballistic protection while keeping the armor weight reduced by at least 10% compared to traditional materials like Al2O3 (3.93 g/cm³), TiC (4.52 g/cm³), and SiC (3.12 g/cm³).
2Reliability
If ceramic tile thickness is increased to stop multiple high-energy projectiles, then the ballistic protection is improved, but the weight and bulk increase
Solution Approach 1:
The patent changes the material parameters by using BAM-B4C composite with optimized weight ratios and controlled grain size (5-50 μm). This allows achieving superior ballistic performance against multiple high-energy projectiles (including tungsten carbide and armor-piercing threats) with reduced thickness and weight. The BAM matrix provides fracture toughness while B4C provides hardness, creating a synergistic effect that stops projectiles without requiring increased thickness.
3Reliability
If the hardness of the striking face is increased to erode projectiles, then the ballistic protection is improved, but the fracture toughness decreases
Solution Approach 1:
The patent applies local quality by creating a composite where different regions have different properties: B4C particles (4000-4700 VHN) provide local hardness for projectile erosion, while the BAM matrix (2600-2800 VHN) provides fracture toughness. This spatial distribution of properties with BAM: 20-80 wt% and B4C: 20-80 wt% allows the striking face to erode projectiles effectively while maintaining overall structural toughness and preventing catastrophic failure.
4Strength
If ceramic material density is increased to improve strength, then the mechanical strength is improved, but the weight increases
Solution Approach 1:
The patent optimizes the density parameter by selecting BAM-B4C composite with density range of 2.3-2.7 g/cm³, which is lower than traditional materials (Al2O3: 3.93 g/cm³, TiC: 4.52 g/cm³, SiC: 3.12 g/cm³). This parameter change achieves both reduced weight (at least 10% lighter) and maintained mechanical strength through the synergistic combination of BAM fracture toughness and B4C hardness.
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 composite material effectively stops multiple high-energy projectiles, including tungsten carbide, with reduced weight and thickness, maintaining or improving ballistic protection while being lighter and more wear-friendly, and preventing shear amorphization, thus offering superior ballistic performance.
Implementation Method 1
B4C and BAM can be sintered, either with or without pressure, with one another to form the compositions of the present disclosure
Implementation Method 2
formed through processes like Spark Plasma Sintering
Data Source
AI summary
A ballistic protective composition having a sintered product of boron carbide and BAM where the sintered product includes up to about 80% BAM by weight based on the weight of the total BAM and boron carbide and wherein the sintered product is configured to prevent penetration of a ballistic threat through the sintered product. The ballistic protective composition may also be bonded to a ballistically protective fabric material to form a ballistic composite, which may be a wearable material, such as a body armor article.