白小姐四肖必选期期中

Sichuan Tengma Technology Development Co., Ltd.
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Discover the mystery of composite materials
Ta Tou 2019-01-04 11:13
Composite materials are composed of two or more materials (matrix materials and reinforcement materials) with different properties, which are composed of materials with new properties at the micro (micro) level through physical or chemical methods. Various materials complement each other in performance, and synergistic effects occur, making the inductive performance of composite materials better than the original composition materials to meet various requirements. The matrix materials of composite materials are divided into two categories, metal and non-metal. Metal substrates commonly used are aluminum, magnesium, copper, titanium and their alloys. Non-metal substrates are mainly synthetic resins, rubbers, ceramics, graphite, and carbon. Reinforced materials are mainly glass fibers, carbon fibers, boron fibers, aramid fibers, silicon carbide fibers, asbestos fibers, whiskers, metal wires and hard fine particles.
FRP cooling tower manufacturers share with you the history of the development of composite materials dating back to ancient times. Straw or wheat straw-reinforced clay and reinforced concrete that have been used for hundreds of years have been composed of two materials. In the 1940s, due to the needs of the aviation industry, glass fiber reinforced plastics (commonly known as glass fiber reinforced plastics) were developed, and the title of composite materials has since appeared.
In the 1960s, in order to meet the demand for materials used in cutting-edge technologies such as aerospace, it has successively developed and produced composite materials with high-performance fibers (such as carbon fibers, boron fibers, aramid fibers, silicon carbide fibers, etc.) as reinforcing materials, and their specific strength It is larger than 4 × 10 centimeters (cm), and its specific modulus is larger than 4 × 10cm. In order to distinguish it from the first generation of glass fiber reinforced resin composite materials, this composite material is called advanced composite material.
According to different matrix materials, advanced composite materials are divided into resin-based, metal-based and ceramic-based composite materials. Its operating temperature is 250-350 ℃, 350-1200 ℃ and above 1200 ℃. In addition to being used as structural materials, advanced composite materials can also be used as functional materials, such as gradient composite materials (chemical and crystallographic composition of materials, structures, open spaces, and other functional composite materials that continuously change in space), alert composite materials (with a sense of , Processing and execution functions, functional composite materials that can adapt to environmental changes), bionic composite materials, stealth composite materials, etc.
The development of modern high technology is inseparable from composite materials. Composite materials have very important effects on the development of modern science and technology. The research depth and breadth of composite materials, and the speed and scale of their production, have become one of the important indicators of a country's advanced level of science and technology. Since the beginning of the 21st century, the global composite materials market has grown rapidly, and Asia, especially China, has grown rapidly. From 2003 to 2008, China's average annual growth rate was 15%, India's 9.5%, while Europe and North America's average annual growth rate was only 4%.
Manufacturers of FRP cooling towers believe that at this stage, China's FRP and composite materials industries are facing a new period of large-scale development, such as large-scale municipal construction, new energy applications and large-scale development during urbanization, the introduction of environmental protection policies, and automotive Industrial development, large-scale railway construction, large aircraft projects, etc. Driven by the huge market demand, the development of the composite materials industry will have ample room for development.
Common classification Composite materials are divided into: metal and metal composite materials, non-metal and metal composite materials, non-metal and non-metal composite materials.
Composite materials are further divided according to their structural characteristics: 1. Fiber-reinforced composite materials. Various fiber reinforcements are compounded in a matrix material. Such as fiber reinforced plastics, fiber reinforced metals and so on. 2. Sandwich composite materials. Composed of different surface materials and core materials. Generally, the surface material is high in strength and thin; the core material is light and low in strength, but it has a certain stiffness and thickness. Divided into solid sandwich and honeycomb sandwich. 3. Fine-grained composite materials. Hard particles are uniformly distributed in the matrix, such as dispersion strengthened alloys, cermets, etc. 4. Hybrid composite materials. It consists of two or more kinds of reinforcing materials mixed in one kind of matrix material. Compared with ordinary single reinforced composite materials, its impact strength, fatigue strength and fracture toughness are significantly improved, and it has special thermal expansion properties.
Composite materials can be divided into two categories, structural composite materials and functional composite materials.
Structural composite materials are materials used as load-bearing structures, and are basically composed of a reinforcement that can accept loads and a matrix that can connect and play a force-transmitting effect. Reinforcement includes various glass, ceramics, carbon, polymers, metals and natural fibers, fabrics, whiskers, sheets and particles, etc., and the matrix includes polymers (resin), metals, ceramics, glass, carbon and Cement, etc. The characteristic of structural composite materials is that component material selection planning can be carried out according to the requirements of materials in the application of force. More importantly, composite structure planning, that is, reinforcement body layout planning, can reasonably meet demand and save materials.
Functional composites are composites that provide other physical properties in addition to mechanical properties. Such as: conductive, superconducting, semiconducting, magnetic, piezoelectric, damping, wave absorbing, wave transmitting, friction, shielding, flame retardant, heat protection, sound absorption, heat insulation, etc. The functional composite material is mainly composed of a functional body, a reinforcing body, and a matrix. The matrix not only plays the role of forming the entire body, but also can produce synergy or strengthen the function.
The functional body may be composed of one or more functional materials. Composite materials with multiple functional bodies can have multiple functions. Together, new functions may occur due to compound effects. Multifunctional composite materials are the development direction of functional composite materials. Various types of composite materials are widely used in fiber-reinforced materials, and the amount is large.
The forming method of composite materials varies according to the base material.
There are many molding methods for resin-based composite materials, including hand lay-up molding, hair spray molding, fiber wrapping molding, compression molding, pultrusion molding, RTM molding, autoclave molding, diaphragm molding, migration molding, reaction injection molding, and soft film expansion. Large forming, stamping, etc.
The glass fiber reinforced plastic cooling tower manufacturers introduce metal matrix composite molding methods into solid phase molding and liquid phase molding. The former is formed at a temperature lower than the melting point of the substrate by applying pressure, including diffusion welding, powder metallurgy, hot rolling, hot drawing, hot isostatic pressing and burst welding. The latter is to melt the matrix and fill it into the reinforced body, including traditional casting, vacuum suction casting, vacuum reverse pressure casting, squeeze casting and spray casting.
Ceramic matrix composites are mainly formed by solid-phase sintering, chemical vapor infiltration molding, and chemical vapor deposition molding.

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