“What are the applications of calcined petroleum coke recarburizers in brake discs and brake pads?” Recarburizers, also known as low-sulfur micro-nitrogen recarburants, are used in the steelmaking and foundry industries to supplement carbon and desulfurization. Materials are also used in other industries, such as carbon-increasing in brake disc cast iron and friction material used in brake pads. When used to produce electrode paste, it is used as a raw material. The current carbon-reinforcing agent is mainly a material after graphitization of petroleum coke.
The cast iron produced by the recarburizer process is called steel cast iron, also known as synthetic cast iron. It has the characteristics of low cost, excellent mechanical properties, process performance and superior performance. It has become a preferred carbon-reinforcing agent in the production of low-nitrogen steel, steel cord and high-strength bead steel for steel production in recent years. The absorption effect in the molten iron is good, and the slag is not returned. The use of the recarburizing agent can greatly reduce the production of the casting. The particle size specification can be divided into 20 mesh - 50 mesh, 40 mesh - 80 mesh, 50 mesh - 150 mesh, etc. according to different usage requirements, and the granularity specification can also be directly proposed by the user.
The study of the structure and properties of high carbon equivalent gray cast iron for brake discs, as the brake disc material, must first overcome the thermal fatigue failure and wear failure mentioned in the previous section. In addition, with the improvement of living standards, the brake disc is also required to have low noise and good anti-jitter performance. The brake disc material is mainly made of ordinary gray cast iron HT150 and HT200. The advantages of this type of brake disc are that there is no brake shake and no harsh brake noise. However, since the brake disc is soft in material and low in strength, it is prone to fatigue cracking and abrasion during use, and has a short service life.
Every year, a large number of brake discs and brake pads are scrapped due to excessive wear. For brake discs, it is necessary to improve wear resistance. We analyzed the nature of the hard phase to determine the wear performance of the brake disc, so adding a certain amount of strong carbide forming elements to the high carbon equivalent gray cast iron can improve the wear resistance of the brake disc. After years of research by casting workers at home and abroad, several measures have been summarized on how to improve the performance of gray cast iron: in recent years, due to the improvement of the quality of molten iron, the extensive application of the carbonizing agent inoculant for brake discs has made gray cast iron The performance has been significantly improved.
The recarburizer can be used as a friction material for the brake pad additive, and the brake pad additive graphite as a friction adjusting material can effectively overcome the shortcomings of the existing asbestos material, significantly improve the friction performance and reduce the manufacturing cost. Compared with the carcinogenicity of asbestos, graphite is a non-toxic, chemically stable, high-performance material. The brake pad recarburizer product has a microscopic structure and a scientific design of the particle size interval. During the braking process of the motor vehicle, the friction coefficient of the brake pad can be kept to a maximum extent, and the brake pad will not be brittle due to the brake, causing the brake to fail. , thereby improving the safety performance of the brake pad during use.