Climax Molybdenum Company, a subsidiary of Freeport-McMoRan, is the world's leading molybdenum producer and supplier. Founded in 1916, our global operations include both primary and byproduct molybdenum mines. Integrated global operations and local customer care provide our worldwide partners with the most reliable supply and highest quality molybdenum and rhenium products. Climax Molybdenum has developed a Responsible Care® Policy as part of our commitment to the Principles of Responsible Care® and to product safety, process safety, environmental stewardship, health, safety, and security at our global operations. We work together with our customers and other stakeholders to develop solutions in support of our common sustainability goals. For detailed information about our metallurgical and chemical products, please contact our sales offices in Europe, Asia and North America.
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EB2020-MDS-036
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Dr. Yakov Epshteyn, Climax Molybdenum, UNITED STATES
Mr. Lawrence Corte, Climax Molybdenum, UNITED STATES
Spherical Molybdenum Disulfide (SMD) in brake pads applications
Authors:
Dr. Yakov Epshteyn, Lawrence Corte
Climax Molybdenum, A Freeport-McMoRan Company
Abstract
Molybdenum disulfide (MoS2) is one of the best known solid lubricants and is commonly found in a variety of lubrication and friction applications. In automotive brake pads, MoS2 is commonly used as a friction modifier to adjust and stabilize the friction coefficient, to eliminate squeaking noise, and for better uniformity of the distribution of friction forces across the brake pad surface.
Climax Molybdenum has developed and patented a new form of MoS2 - Spherical Molybdenum Disulfide (SMD). SMD powder was produced by spray drying of the slurry of the four different ingredients including molybdenum disulfide, liquid, a binder and a dispersant. Formulation and granulating the SMD particles can be arranged to modify the particle size, hardness, etc. It was demonstrated that the effect of oxidation through the spray drying process was insignificant. The average SMD particle size measured by MicroTrac® was about 60 microns.
For this study, a powder matrix without solid lubricants was used to evaluate the influence of various solid lubricants. The solid lubricant powders were added in a tumble mixer and subsequently pressed into pad material. Brake pads testing was conducted using the brake pad tester.
This presentation reviews the lubrication properties of brake pads containing Spherical Molybdenum Disulfide (SMD). Based on the multiple test results, it was established that brake pads containing novel SMD materials significantly outperformed conventional Molybdenum Disulfide (Climax Technical Grade) by 33.6% with respect to wear performance and by 29.1% with respect to coefficient of friction performance.
Also, it was established that the SMD with half the amount of binder was outperformed by SMD with the full amount of binder, therefore we have reason to believe that increasing the binder content of the SMD could even further improve the performance.
EuroBrake 2021
IRM
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