A simple scheme for classifying composite materials consists of three divisions:
Particle-reinforced composites are subdivided into large-particle reinforced and dispersion-consolidated. This distinction is based on the consolidation or reinforcement mechanism.
The term “large” is used to indicate that the matrix-particle interactions cannot be described at the atomic or molecular level, but by continuum mechanics. In most composite materials the dispersed phase is harder and tougher than the matrix and the reinforcing particles tend to restrict matrix motion in the vicinity of each particle. In essence, the matrix transfers some of the applied stress to the particles, which carry some of the load. The degree of strengthening or enhancement of mechanical behavior depends on the cohesive strength at the matrix-particle interface. A composite material with large particles is concrete, consisting of cement (matrix) and sand or gravel (particles). The smaller the particles are and the better distributed they are in the matrix, the more effective the reinforcement is. In addition, the volume fraction of the two phases influences the behavior; mechanical properties increase with increasing particle content.
The particles of dispersion-consolidated composites are usually much smaller: the diameters range from 10 to 100 nm. The matrix-particle interactions that lead to consolidation occur at the atomic or molecular level. While the matrix bears most of the applied load, the small dispersed particles hinder or prevent the displacement of dislocations. This restricts plastic deformation in such a way that yield strength, tensile strength and hardness are increased.
They combine composite and homogeneous materials whose properties depend, in addition to the materials they are made of, on the geometry of the design of the structural elements. They can be classified as follows:
Technologically, composite materials with dispersed phases in the form of fibers are the most important. Fiber-reinforced composites are often designed with the aim of achieving high strength and stiffness at low density. These characteristics are expressed by the parameters specific strength and specific modulus, which correspond, respectively, to the ratios of tensile strength to specific weight and modulus of elasticity to specific weight. By using low-density materials for both the matrix and the fibers, fiber-reinforced composites with exceptionally high specific strengths and moduli are produced. Fiber-reinforced composites are subclassified by fiber length.
Temperature it is a bottleneck for all power electronics in general, that’s a fact. We need safer, more efficient, and reliable electronics but as we are taking power density values to the limits, thermal performance becomes a tricky topic. Not only because thermal compounds have to fit all these technical requirements ( …
The competition for vehicle charging is not only played in the field of power (more power, less time) but also in the format… Cable vs Wireless, where each technology uses its own weapons and faces its disadvantages to position itself as the leading technology. If we talk about the charging method par …
INTERVIEW WITH XAVIER MIRABET – Keys to enter the automotive and power electronics industry 2022 will be remembered as a key year in all industries. After the pandemic, digitalization in all aspects of life has pushed us to create innovative solutions, which have helped us to adapt, both in terms of operation, …
CoolMag™ Sample
Request a sample to test CoolMag's thermal compound and prove how well it protects your power electronic components from overheating.
Get in touch with us
Request more info