Composite

Composite is a material formed by combining two or more distinct materials that remain physically separate and identifiable within the finished product.  The purpose of creating a composite is to obtain a combination of properties that cannot usually be achieved by any of the individual constituent materials alone.  In most engineered composites, one component serves as the matrix, which binds the material together and transfers loads, while the other component serves as the reinforcement, which provides strength, stiffness, toughness, or other desired properties.

 

Typically, a composite consists of a "reinforcement" material, often in the form of fibers, particles, or flakes, embedded within a "matrix" material.  The reinforcement provides strength, stiffness, or other desired mechanical properties, while the matrix binds the reinforcement together, protects it from environmental damage, and transfers loads between the reinforcement elements.  This synergistic combination allows composite materials to offer superior strength-to-weight ratios, stiffness, durability, and other specialized functionalities compared to traditional monolithic materials like metals or plastics, making them valuable in diverse applications ranging from aerospace and automotive to sporting goods and construction.

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Composite

Matrix  -  The matrix is the continuous phase that surrounds and binds together the reinforcement material.  It can be a polymer, metal, ceramic, or other materials depending on the application.

Reinforcement  -  The reinforcement provides additional strength, stiffness, and other desirable properties to the composite.  Reinforcements can be fibers (glass, carbon, aramid), particles, or other forms, and they are embedded within the matrix.

 

Composite Types

Composites (or composite materials) are engineered materials made from two or more constituent materials with significantly different physical or chemical properties that remain distinct in the finished structure, producing a material with superior characteristics.
Polymer Matrix Composites (PMCs)  -  The most common type; consist of a polymer (thermoset or thermoplastic) matrix reinforced with fibers (e.g., glass, carbon, aramid) or particles; widely used in aerospace, automotive, and consumer goods for their light weight and strength.
Metal Matrix Composites (MMCs)  -  Feature a metal matrix (e.g., aluminum, titanium, magnesium) reinforced with ceramic particles, fibers, or whiskers; valued for improved strength, stiffness, and wear resistance at higher temperatures.
Ceramic Matrix Composites (CMCs)  -  Composed of a ceramic matrix reinforced with ceramic fibers or particles; offer high-temperature stability, oxidation resistance, and toughness for extreme environments like engines and aerospace.

Classification by Reinforcement

Fiber-reinforced Composites  -  Continuous or discontinuous fibers as reinforcement.
Particle-reinforced Composites  -  Particles or whiskers dispersed in the matrix.
Structural Composites  -  Include laminates and sandwich structures.

Other recognized categories include carbon-carbon composites and hybrid composites, but the matrix-based classification (PMC, MMC, CMC) is the most standard and verifiable primary system.