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Describe

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made from two or more materials combined, each with

significantly different physical or chemical properties

within a composite material, one material will serve as a matrix to

hold another material, the reinforcement

Example: plywood is light and strong,

cermets cutting tool is hard and abrasive-resistant

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1. Polyethylene is produced from its monomer ethene which
exist as a gas at room temperature.

2. In its gaseous form, ethene molecules move randomly in space and interact with one another through weak Van der
Waals forces of attraction.

3. Each ethene molecule has 2 carbon atoms held by a double covalent bond. The double bond is unstable and can be broken through heating.

4. Once broken 2 free electrons from the broken bond combine with other ethene molecules forming a chain.

5. As the reaction progresses the chain gets larger thus forming polyethene

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Describe............

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Particulate composites indeed offer unique characteristics and are classified based on the characteristics of the reinforcing particles. Here's an overview:

1. Reinforcing Phase: In particulate composites, the reinforcing phase consists of particles rather than fibers or continuous sheets. These particles can vary in size, shape, and composition, providing flexibility in tailoring the properties of the composite.

2. Particle Characteristics: The particles in particulate composites can take various forms, such as spherical, flakes, short fibers, or whiskers. Each shape imparts specific properties to the composite, influencing factors like strength, stiffness, and thermal conductivity.

3. Uniform Dispersion: Ideally, particulate composites aim for a uniform dispersion of reinforcing particles within the matrix material. When particles are uniformly distributed, the composite tends to exhibit isotropic properties, meaning it possesses similar mechanical characteristics in all directions. This uniformity is crucial for achieving predictable and consistent performance in applications.

4. Isotropic Properties: Particulate composites with uniformly dispersed reinforcing particles tend to display isotropic properties, including equal strengths in all directions. This is advantageous in applications where consistent mechanical behavior regardless of orientation is desired.

5. Applications: Particulate composites find applications in various industries, including automotive, aerospace, electronics, and construction. They are utilized where specific properties such as strength, lightweight, or thermal conductivity are required, and the ability to tailor these properties through the choice of particle type and dispersion offers versatility in meeting diverse application requirements.

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Composites indeed have their drawbacks, despite their many advantages:

1. High Cost of Raw Materials and Fabrication: The materials used in composites, such as carbon fibers or high-performance resins, can be expensive. Additionally, the fabrication processes for composites often require specialized equipment and expertise, which can drive up the overall cost of production.

2. Brittleness: Compared to traditional wrought metals, composites can be more brittle, meaning they are prone to fracturing or shattering under certain conditions. This brittleness can make composites less forgiving of impact or stress concentrations, increasing the likelihood of damage.

3. Anisotropic Properties: One of the key challenges with composites is their inherent anisotropy, meaning their properties vary depending on the direction in which they are measured. While traditional engineering materials like metals are typically isotropic, composites exhibit different strengths, stiffnesses, thermal expansions, and conductivities in different directions. This anisotropy can complicate design and engineering efforts, requiring careful consideration to ensure optimal performance and structural integrity.

Despite these disadvantages, composites continue to be widely used and developed due to their unique combination of properties and the ability to tailor these properties to specific applications. Advances in material science and manufacturing techniques aim to address some of these drawbacks and further enhance the performance and versatility of composite materials.