Fiber heating cables have been used more and more frequently in recent years, and the occasions for use are also expanding. For example, underfloor heating was only popularized in the north in the past, but with the change of concept, more and more southerners are also laying underfloor heating in general. In addition, with the continuous improvement of carbon fiber heating technology, carbon fiber heating cables have become more and more adaptable to ultra-low temperature environments, and have greater application space.
Long ago, electric heating technology using metal materials as heating elements has been widely used in various fields. However, the surface of the metal wire is easily oxidized at high temperature. Due to the continuous thickening of the oxide layer, the area for effective current passing is reduced and the current load is increased, so it is easy to burn. Under the same allowable current load area, the strength of the metal wire is 6-10 times lower than that of the carbon fiber, and it is easy to break during use. Carbon fiber is composed of a kind of graphite hexagonal lattice layer structure, which is a kind of “all black body material”, so it has high electrothermal conversion efficiency in electrothermal applications. Under certain conditions, high temperature does not oxidize, and the current load intensity and mechanical strength per unit area do not change. At present, carbon fiber heating cables are widely used in low-temperature radiation heating cables, floor heating systems, constant temperature brood boxes, flower houses, nurseries, vegetable greenhouses, etc., heat preservation and heating, road snow removal, airport runway snow removal, pipelines, tank insulation and antifreeze, football field lawns And the public green space soil insulation, etc.
In terms of snow melting on roads and airport runways, carbon fiber cables can be used for floor heating in concrete structures, as well as snow melting devices to prevent frost on roof rainwater and drainage pipes, and can also be used for soil heating. In terms of heat preservation and anti-freezing of pipelines and tanks, electric heating products have been vigorously promoted and applied in China. Its application fields are mainly concentrated in petroleum, chemical industry, electric power, railway and civil or commercial buildings. With the development of China’s electric power industry, the market prospect of electric heating products using clean, non-secondary pollution electric energy as the main energy source is very broad. At the same time, higher requirements are put forward for the performance of electric heating products. In the field of soil insulation for football field lawns and public green spaces, solar water heaters are mainly used to supplement heat energy when the water temperature of solar water heaters cannot meet the needs of life and engineering due to long-term rainy days or cold winter seasons due to insufficient light. of. It has strong heat resistance, severe cold and high temperature and humidity environment performance, and has the function of preventing dry burning. Even if the water tank is short of water and energized by mistake, the electric heater and water tank will not be burned out, so safe use can be ensured.
In addition, carbon fiber heating cables can adapt to harsh environments such as high and low temperatures. Carbon fiber is as thin as spider silk, and the specific strength of type 3 carbon fiber is more than 62 times that of steel. It has good forming process and is a new generation of engineering materials. Its elastic modulus is high, its resistance to degeneration is more than twice that of steel, its tensile strength is 30-40t/cm2pa, and its specific gravity is less than one-fourth of steel, one-half of aluminum alloy, and high elastic modulus. It is 16 times larger than steel and 12 times larger than aluminum alloy. Carbon fiber is softer than steel, so it can be used to strengthen the core of cables that require load-bearing and not easy to damage internal components, such as submarine optical cables.
Carbon fiber can withstand low temperatures of -180°C. Under this condition, many materials become very brittle, even the strong steel becomes more easily broken than glass, and carbon fiber is still very soft under this condition. Therefore, the carbon fiber composite core can be used for the design and manufacture of power transmission carriers under extremely cold conditions (such as Antarctic research, etc.). In addition, carbon fiber can withstand a high temperature of 3000°C to 3500°C. At this high temperature, the best heat-resistant steel also becomes molten steel, but in the absence of oxygen, the carbon fiber does not change. The carbon fiber will not burst even if it is quickly cooled from a high temperature of 3000°C to room temperature, so it can work in a rapidly cold and hot environment. This provides the possibility for the design of cables for high temperature and high temperature occasions in the steel, metallurgy, boiler and other industries.
Carbon fiber rope and carbon fiber cloth can be used in the design and selection of fire-fighting cable products. Carbon fiber has superior corrosion resistance. The strongest corrosion resistance among metals is gold and platinum. Gold and platinum will be corroded in a solution called “Aqua regia” made of one part of nitric acid (70% concentration) and three parts of sulfuric acid (concentration 39%). Sores are full of holes, but the carbon fiber in “Aqua regia” is safe and sound. It provides a new idea for the design of light-duty chemical-resistant cables in various chemical environments.
In summary, the application prospects of carbon fiber heating cables are constantly expanding, and the future application prospects of carbon fiber heating cables are very impressive.