Brake pad material is divided into binder, fiber, frict […]
Brake pad material is divided into binder, fiber, friction modifier, filler four parts. Binder: Automotive friction materials are generally used in thermosetting binder, the specific application of phenolic resin (mainly Composition of phenolic resin a nitrile. Quality standards Q / HSY048-94, Appearance light yellow to light brown viscous liquid 250 ℃ ≥7, Shear strength / MPa 300 ℃ ≥4, Room temperature ≥25 320 ℃ ≥3, Features and Uses Adhesion to brake pad and brakes of automobiles, etc. Adhesive surface of construction technique Degreasing, sanding or sandblasting, wiping with acetone or ethyl acetate, applying glue twice, airing for 20min, baking at 80 ℃ for 20-40min After the closure, 160 ~ 170 ℃ curing 3h), melamine resin, epoxy resin, silicone resin, polyamide resin. The most widely used are phenolic resin and its modified resin. The purpose of modification is to improve the high temperature properties of the resin.
Reinforcing fiber is a friction material and the main friction component plays a role as a reinforcing base. As traditional materials, asbestos and other mineral fibers are used. Semi-metallic automotive friction materials are made of steel fibers, while a small amount of copper fibers and a few mineral fibers are added. In recent years, there are more and more types of reinforcing fibers, of which the most noticeable is the application of aramid fiber. The addition of organic fibers can reduce the density of the material and reduce its wear, but also reduce the friction coefficient of the material. In order to improve the stability of the friction material at various temperatures and the affinity of the fibers and binders, a variety of fibers are often used in practical applications.
Frictional performance regulators can be divided into two categories: Anti-friction material: Mohs hardness is generally less than 2, its addition can improve the material's abrasion resistance, reduce noise and reduce the friction coefficient. Such materials are: graphite, molybdenum disulfide, lead, copper and so on. Friction material: Mohs hardness is generally greater than 4, its addition can increase the friction coefficient of the material. Most inorganic fillers and some metals and their oxides belong to this category. Frictional modifiers are added mainly to adjust the thermal stability of materials and their work stability.