Prof. Lee questioned: What is the train's disc brake pad (disc brake lining) made of? Here are what we found on the Internet:
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| A train's straight air brake system diagram - Attribution: Harpwolf at en.wikipedia.org |
How does a modern train's disc brake look like? See the picture below:
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| Axle-mounted disc brakes on a train bogie - Photo courtesy Eurail mag. |
An example of disc brake lining compositions (semi-metallic types):
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| Selection of Best Formulation for Semi-Metallic Brake Friction Materials Development (experiments done for car brakes, pdf) - www.intechopen.com |
As can see in the data, modern disc brake linings (a friction material) are made of composite material of partly ceramic, metallic, plastic, rubber and resin mixture. Meanwhile, the brake disc (or disc brake "rotor" in American English) is usually made of cast iron, cast steel, or carbon / ceramic composites according to the required braking performance (ref. Knorr-Bremse Brochure - Brake Discs and Pads for Railway Trains, a pdf document). The choice of the brake lining has to match the properties of the brake disc material in order to meet the maximum braking performance and longevity.
That's it.
下課。
Keep updating your blog. Awaiting for your next update.
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