It is the first time to see a modified carbon fiber, which is like a woven bag. Like LV woven bag, even if the LV brand is hung, it still looks very bad, but little brother A Chang, the modification technician of Balance, praises it endlessly. The little mosquito wondered, is it really so good? I learned that I was really misled by his unattractive appearance. So people, the more ignorant they are, the easier it is to make subjective judgments. Carbon fiber has many excellent properties, such as low density, high strength, good over temperature resistance, fatigue resistance, small thermal expansion coefficient, anisotropy, good corrosion resistance, and good X-ray transmission. Materials with these characteristics are used on vehicles. In the sporty direction, lighter weight can perform better when the vehicle is accelerating, braking or cornering. It has high strength and can achieve better transmission efficiency when applied to the half shaft and transmission shaft. Giulia and Stelvio of Alfa Romeo also have applications.
The proportion of Giulia and Stelvio carbon fibers of Alfa Romeo is less than 1/4 of that of steel. The tensile strength of carbon fiber resin composites is more than 3500 MPa, and the tensile elastic modulus is 23000 ~ 43000 MPa, which is also higher than that of steel. These characteristics make carbon fiber the most lightweight body modification. But carbon fiber is also fiber, why is it so expensive? It is expensive mainly for four reasons.
1,?? For raw materials, only 1 ton of carbon fiber can be burned from 2 tons to 2.2 tons of raw silk, with a cost of about 40000 to 60000/ton.
2,?? For equipment cost, the import of a thousand ton line for a complete set of equipment will be more than 200 million, and if some of the equipment is made in China, it will also be 150 million, with an annual production capacity of about 1500 tons.
3,?? The processing technology of carbon fiber is heat treatment, which requires a large amount of electricity, accounting for 25% - 30% of the production cost of carbon fiber. (This electricity bill is really expensive.)
4,?? The R&D cost is high because carbon fiber is a multidisciplinary product with about 3000 control points in the whole process. BMW Carbon Fiber Bicycle 2000 US $Yema Carbon Fiber Bumper 800 US $Carbon Fiber also has two points to pay attention to:
1. When purchasing carbon fiber modified parts, pay attention to the resin types in carbon fiber products, including cyanate ester resin, epoxy resin and ester resin. The three grades are decreasing. Cyanate ester resin is mainly used in aerospace and military industries.
2. Poor plasticity. At present, many of our car bodies can be repaired after collision, because steel and other metal materials have ductility. The carbon fiber material only shows high strength along the fiber axis, but its impact resistance is poor, and it is easy to be damaged. After collision, it cannot be repaired, so it can only be replaced as a whole. Ferrari? Therefore, the price of carbon fiber is high due to its characteristics, cost and irreparability. The all carbon fiber body Koenigsegg Knox has released a report. In the "Road Map for Expanding the Application of Carbon Fiber in Automobile", it is said that by 2025, the application of carbon fiber in automobile will become mainstream. The progress of carbon fiber processing technology, the increase of patent number and the control of production cost will slow down the price of carbon fiber automotive supplies. This article comes from the author of the car home number, which does not represent the standpoint of the car home.