Asphalt is a low-molecular-weight hydrocarbon compound mainly composed of condensed polycyclic aromatic hydrocarbon compounds, some of which contain a small amount of sulfur and oxygen. Asphalt has a characteristic that the carbon content is more than 70%, so it is often used to make carbon fiber. Carbon fibers made from pitch can be mainly divided into two types, one with lower mechanical properties and the other with particularly good tensile strength.In this article, I will tell you about manufacturingpitch-based carbon fiberbasic process flow.
The pitch base used to make carbon fibers needs to meet several conditions. First of all, the pitch fiber must have good spinning rheological properties and chemical activity, because after spinning, if the fiber is not melted, it needs to undergo chemical reaction. If the chemical activity of the pitch is too poor, it cannot be well completed. this step. It must then have the chemical structure, relative molecular mass and distribution required for the mechanical properties of the pitch fiber. In order to make qualified asphalt, its chemical composition must be continuously adjusted. In addition, pitch is in a molten state, unlike general polymers. It cannot be stretched after curing, the strength is not high, and it is relatively fragile. Therefore, when spinning, the diameter of the filament is required to be less than 15 μm, so as to improve the strength.
In order to prevent the pitch fiber from melting during carbonization, it must be treated without melting before carbonization. There are two methods, gas-phase oxidation and liquid-phase oxidation. Vapor-phase oxidation is carried out in oxidizing gases such as ozone and sulfur trioxide, while liquid-phase oxidation is carried out in oxidizing gases such as sulfuric acid and hydrochloric acid. In this way, more satisfactory pitch-based carbon fibers can be produced. Pitch-based carbon fiber is mostly used to make carbon fiber parts with high performance requirements, and has irreplaceable value in the market.
ISO 9001 certified. BE-CU Prototype Offering CNC machining carbon fiber and other manufacturing services for carbon fiber marterial. Various capabilities include notching, labeling, drilling carbon fiber, grinding, laser cutting carbon fiber, finishing, plating, marking, CNC milling carbon fiber and turning carbon fiber.We stock high quality 3k carbon fiber sheet in a variety of thickness, types and finish. Its a great material used in applications where light weight and strength are needed such as drones. Unlike other workshops, we have no min order and are often filling orders with a single part. We also don’t make you pay for the full sheet and you only get charged for what is used. With a large selection of material, you should find everything you need to make your project come to life. We are also able to handle larger production runs and provide a competitive pricing. If we don’t have the material or finish you require, we are more the willing to look at bringing it in for you.
What Is Carbon Fiber?Carbon fiber is made of polyacrylonitrile (PAN) (or pitch, viscose) and other organic fibers by carbonization (removal of most elements except carbon) by pyrolysis method under inert gas at high temperature above 1,000 °C. Inorganic polymer fibers with a carbon content of more than 90%.