Friction material is a kind of component material used in power machinery, which relies on friction to perform braking and transmission functions. It mainly includes brake lining (brake pad) and clutch face plate (clutch plate). The brake pads are used for braking and the clutch pads are used for transmission.

Friction material belongs to polymer ternary composite material, which includes three parts: (1) using polymer compound as binder; (2) Inorganic or organic fibers are used as reinforcing components; (3) The filler is used as the friction performance modifier or compounding agent.

1. Binder

The organic binders used for friction materials are phenolic resin and synthetic rubber, and phenolic resin is the main one. For friction materials, the heat resistance of resin and rubber is a very important performance index. Because when the vehicle and machinery are braking and driving, the friction plate is under high temperature conditions of 200 ℃~450 ℃ for a long time.

2. Fiber reinforced materials

Fiber reinforced materials constitute the main body of friction materials, which endow friction products with certain friction properties and sufficient mechanical strength. Because the friction material products are under high temperature conditions for a long time in the work, the general organic fibers can not withstand this high temperature condition, so most of the friction materials are inorganic fibers, which include natural mineral fibers (asbestos fiber, wollastonite, magnesium hydroxide, sepiolite, etc.), artificial mineral wool, inorganic fibers (ceramic fiber, glass fiber, etc.) and metal fibers (copper fiber, aluminum fiber, etc.).

Wollastonite is a kind of infinitely chain-like calcium metasilicate mineral with Mohs hardness of 4-5 and density of 2 8g/cm3, wollastonite is acid-resistant, alkali-resistant, chemical-resistant, and has good thermal stability. Its melting point is 1540 ° C, and it does not contain adsorbed water and crystalline water. It is still stable at 900 ° C. The aspect ratio of acicular wollastonite is generally 6~20, which is closely related to the strengthening effect of wollastonite. The larger the aspect ratio is, the better the reinforcement effect is. The best aspect ratio of wollastonite for friction materials is greater than 15. In actual use, the amount of needle-like wollastonite used in friction materials is generally 15% - 20%, because wollastonite has a hard texture and can form a high friction factor, and high amount will lead to the generation and increase of noise.

The GY series ultra-fine needle-shaped wollastonite powder of Guangyuan Group is a high-quality functional powder material made from high-quality wollastonite long-fiber concentrate with high whiteness and low loss on ignition in Xinyu, Jiangxi Province, and processed by two special processes: dry process and wet process. It has excellent comprehensive properties such as low thermal expansion, excellent thermal shock resistance, improved friction coefficient and reduced wear rate when used in friction materials, The application prospect is very broad.

3. Packing

Filler is one of the three major components of friction materials, including a variety of friction performance modifiers and other additives. Its main function is to adjust the friction and wear properties of friction materials in many ways, so that friction materials such as brake pads, clutch discs, etc. can better meet the requirements of braking and transmission functions under various working conditions. According to chemical composition, fillers can be classified into inorganic fillers, metal fillers and organic fillers. Because friction materials have been working at high temperature for a long time, inorganic fillers have unique advantages in high temperature resistance, so most of the fillers in friction materials belong to this category. Several inorganic powder fillers produced by Guangyuan Group have good functional performance in friction materials.

Barite

Mohs hardness of barite 2-5-3 5. High relative density (4.4~4 6) , is the most widely used filler for friction materials. According to the content of BaSO4, the grade of barite used in chemical industry is divided into Grade I 96%, Grade II 90% and Grade III 85%. The specification of barite used in friction material industry is mostly 90% - 95%. It can make the friction coefficient stable and wear small, especially at high temperature, it can form a stable friction boundary layer, prevent the surface of the dual material from scratching, make the surface of the dual more smooth, and reduce wear and brake noise.

talc

Talc is a hydrated silicate mineral with layered structure, with Mohs hardness of 1 and relative density of 2 7~2.8, melting point is 1300~1400 ° C. As a mineral antifriction regulating filler in friction materials, it has obvious antifriction effect. In addition, it has good adhesive ability with resin and can also improve the strength of block resin-based friction materials.

As the leading enterprise of inorganic non-metallic powder in China, Guangyuan Group has been committed to the R&D and production of various inorganic non-metallic powder to meet the needs of customers in various industries. The company's products have been widely used in nearly 100 sub-sectors, such as plastics, coatings, paper and so on. We have always adhered to the service concept of "excellent quality and customer satisfaction", and the continuous R&D and innovation services will win an increasingly broad market.