Application prospect of inorganic nonmetallic powder in ...

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.

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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 ° 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 ~ ° 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.

Corrosion is the gradual destruction of materials by natural interactions with the environment. Corrosion arises from chemical or electrochemical interactions that are happening all the time.

Rust is the most common form of corrosion, happening due to oxidization of metal. Oxidization takes place simply because of direct contact between the affected surface and oxygen molecules.

To maintain the performance of industrial materials, a plan to prevent corrosion is essential.

Equipment and surfaces can be defended from some corrosion by maintaining appropriate work conditions &#; for example, reducing humidity and preventing incidental spillage of corrosive agents.

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However, industrial coatings are the most effective and longest lasting approach.

Industrial Coatings Use Advanced Chemistry to Protect Vulnerable Surfaces

Whether you need to protect a piece of equipment, a pipe, a wall, or flooring, the right industrial coating is essential. Coatings provide chemical protection against corrosion on a molecular scale.

Rusting takes place when oxygen in the environment bonds with iron or an alloy that contains iron. Iron forfeits electrons to the oxygen, facilitating oxidization. The rusted surface is much weaker than it was initially and may not stand up to design tolerances.

One of the most common approaches to corrosion prevention is the application of a sacrificial coating. A more reactive metal with a lower rate of corrosion is used to protect the base surface from rust.

This is seen in galvanization, where a thin layer of zinc is applied to steel or iron. The resulting alloy has a far longer service life than unprotected metal. Not only is this a common and affordable procedure, it helps control costs associated with replacement.

The Most Common Industrial Coatings and Their Uses

Industrial coatings shouldn&#;t be confused with primer, which prepares a surface, or basic paints. Paints for industrial applications provide some protection but are not usually sufficient alone. To maximize performance, the right industrial coating must be matched with the right job.

Although the most attention is devoted to industrial coatings for steel, virtually all materials can be strengthened through appropriate coatings. These include concrete, acrylic, and a variety of others.

Some of the most common industrial coatings include:

1. Thermal Coating

In environments with extremely high or low temperatures, metal can be damaged by expansion or contraction. Likewise, materials that easily weather sustained temperatures can be harmed by sudden fluctuations. The right thermal coating protects surfaces in either of these cases.

2. Powder Coating

These products are advised when you need a coating that does not require a solvent. They are applied by heating a thermoplastic material until it turns into a powder, then applying it to a heated surface. This improves adhesion and further strengthens corrosion defense.

3. PTFE Coating

PTFE &#; formal name polytetrafluoroethylene &#; is best known under the Teflon brand name and was discovered by DuPont in . PTFE not only prevents corrosion, but increases mechanical strength for the devices it is applied to.

The versatility of PTFE shouldn&#;t be underestimated. It is a good go-to coating for a wide range of applications. In addition to anti-corrosion protection, it can resist weathering from ultraviolet rays, many chemical reactions, and some forms of nuclear radiation.

4. Fluoropolymer Coating

These coatings consist of a precise blend of high performance resins and lubricants. They are distinguished by superior friction reduction qualities ideal for temperature extremes. Added dry film lubricant provides outstanding resistance to corrosion and chemical spills.

5. Phenolic Coating

Phenolic coatings enhance surfaces with corrosion protection in high intensity applications, including immersion in many acids, salts, and solvents. It is optimized for high temperatures and relatively low pH environments.

6. Phosphate Coating

Phosphate is used as a conversion coating, meaning it modifies the surface it is applied to. This can enhance paint adhesion or improve performance qualities depending on the formula used. It can also be used as a primer to convert materials into a decorative surface.

7. Zinc Coating

Zinc coatings are available in two main varieties, organic and inorganic. While both will protect steel from corrosion, it&#;s a good idea to seek out inorganic zinc coatings whenever possible. The nature of the chemical bond allows inorganic coatings to have a higher concentration of zinc.

Matching Coatings to Environmental Conditions in Your Industrial Workplace

The above represents only a small subset of the coatings available.

Coatings should be carefully selected based on a number of factors:

• The materials to be protected (steel, iron, bronze, copper, etc.)
• The specific form of the equipment (pipes, equipment, walls)
• Additional hazards in the environment (temperature, pH level)
• Corrosion or rust-accelerating factors (moisture, abrasion risk)
• Various ways coatings can enhance other performance qualities

The best way to balance all these considerations is to bring your project to experts who understand your industry and goals. For personalized advice, contact the team at Performance Painting Contractors today.

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