The Application of Wollastonite in Brake Pads Production
Wollastonite has found significant applications in the production of brake pads, playing a crucial role in the composition of brake pads friction materials and brake pads mixtures.
1. Advantages
1.1 High – Temperature Resistance
Wollastonite has excellent high – temperature resistance properties. In brake pads, it can withstand the high temperatures generated during braking. For example, during intense braking, the temperature of brake pads can reach up to 600°C. Wollastonite – containing brake pads can maintain their structural integrity and performance stability under such high – temperature conditions, ensuring reliable braking performance.
1.2 Friction Stability
When incorporated into brake pads mixes, wollastonite contributes to stable friction coefficients. Laboratory tests show that brake pads with wollastonite have a friction coefficient that remains within a relatively stable range of 0.35 – 0.45 under different braking speeds and loads. This stability is crucial for the smooth operation of the braking system, providing consistent braking force and reducing the risk of sudden braking changes.
1.3 Wear Resistance
Wollastonite improves the wear resistance of brake pads. In long – term wear tests, brake pads with wollastonite showed a wear rate that was 20% lower than those without it. This not only extends the service life of the brake pads but also reduces the frequency of replacement, bringing cost – savings to users.
1.4 Cost – effectiveness
Compared to some other high – performance friction – enhancing materials, wollastonite is relatively inexpensive. Its wide availability in nature makes it a cost – effective choice for brake pad manufacturers. Using wollastonite in brake pads mixtures can reduce the overall production cost by about 15% without sacrificing much in terms of performance.
2. Disadvantages
2.1 Compatibility Issues
In some cases, wollastonite may have compatibility problems with certain components in the brake pads mixture. For instance, when combined with some types of synthetic resins in the brake pads friction materials, it may cause difficulties in the curing process. This can lead to inconsistent quality of the final brake pads products.
2.2 Limited Friction – Boosting in Extreme Conditions
Although wollastonite provides stable friction under normal conditions, in extremely high – speed braking or very low – temperature environments, its ability to boost friction is somewhat limited. In high – speed braking tests above 200 km/h, the friction coefficient of wollastonite – based brake pads may drop slightly compared to some specialized high – performance friction materials.
In conclusion, wollastonite has both remarkable advantages and some limitations in the production of brake pads. Manufacturers need to carefully consider these factors when formulating brake pads mixes to fully utilize the benefits of wollastonite while minimizing its negative impacts.
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