Our research has demonstrated that two sulfides of identical chemical composition can have different reactivity in front of oxygen and provide different degree of performance and wear protection. As a result, we developed our SF range of Iron /Tin sulphides Composites, which are not just mechanical mixes of different sulphides. Their unique microstructure allows us to modify the oxidation temperature compared with a mechanical mix of FeS and SnS of the same chemical composition.
The use of composite sulfides with a particular microstructure allows to reduce the content of Sn without compromising safety and wear
The use of synthetic metal sulfides has been seen as one of the solutions for stabilization of coefficient of friction at high temperature and reduction in wear in copper-free formulations. Metal sulfides are converted in metal oxides during the braking, and this oxidation reaction affects the tribochemistry in the interface between pad and rotor. The study of the relationship in between the oxidation temperature of different metal oxides and the effect of those sulfides in the performance and wear of a copper-free formulation can help to bring a better understanding of the mechanism that makes the sulfides a good solution for copper-free formulations.
With this change, we can get closer to the oxidation temperature of tin-only based sulphides, but reducing the content of tin and so the price level. Phenolic resin is the matrix of the brake pads and starts to decompose around 300ºC, in presence of oxygen and temperature, resulting in the degradation of the PAD surface. Our objective is now to confirm that there is an interaction between metal sulphides and resin, and the oxidation mechanism of both materials seems to be modified when they are blended.
Comparative AKM test have been done to correlate the differences on oxidation temperature range with the friction performance in a NAO Cu-free friction material. SF series is a new option with improved cost-to-performance ratio. SF05 is recommended to replace SnS based compounds and SF10 and SF13 are recommended to replace SnS2 products. Please, contact us for more information.
Our multidisciplinary team includes tribologist, chemists and logistics experts. More than twenty years of experience and great knowledge of the market and applications allow us to support during all phases of the project, guaranteeing the quality and flexibility that the sector demands.
Do not hesitate to contact us for any question or requirement you may have. We will be happy to collaborate with you
Visit us
Armenteres s / n – Pol.Ind. MATACÀS- Nave 21 08980
Sant Feliu de Llobregat Barcelona, Spain
Call us
+34 93 666 46 11 / +34 635 519 002
Write to us
friction@rimsa.com
– LM09 is designed to provide high thermal conductivity to the pad
– LM09 keeps the performance at high temperature and reduces wear
– Can be used in all kinds of formulations. It helps build a stable transfer layer on PAD and ROTOR
– Particle size distribution made it suitable for easy mixing and dispersion, and make it suitable for standard storage.
Tested in a NAO type, copper-free formulation in replacement of Sb2S3, in volume, LM09 achieves a thin and homogenous transfer film on the pad surface, contributing to the stability of coefficient of friction and low wear in both pad and rotor
Several studies reveal that occupations closely related to antimony have been more prone to cardiac diseases, skin irritations and digestive disorders.
Moreover, Sb-subproducts has been reported to be partially soluble in physiological fluids and carcinogenic in laboratory animals, though for human beings is still under suspicion
Do not hesitate to contact us for any question or requirement you may have. We will be happy to collaborate with you
Visit us
Armenteres s / n – Pol.Ind. MATACÀS- Nave 21 08980
Sant Feliu de Llobregat Barcelona, Spain
Call us
+34 93 666 46 11 / +34 635 519 002
Write to us
friction@rimsa.com
All machine in movement needs to be stopped at some moment. The brake is responsible to turn this kinetic energy into heat and release it through the interface.
This is the everlasting basis of the friction industry. Actually, during a normal braking, the disc is responsible to dissipate around 80 % of the heat generated by friction. The temperature can raise up to 600-700 ºC in rough conditions. As a result of the energy involved in this process, tribo-chemical reactions and erosion always take place.
The chemical composition of the brake PAD then, is directly related with the performance of the whole brake system.
Every time you stop your vehicle, a small amount of material is released in form of PM10 and PM2,5, small enough to be caught in air turbulence and easily enter human airways.
Depending on their composition, can be quite harmful to wildlife as they might contain metals such as copper, chromium, lead, antimony and metal oxides.
Considering that around 21% traffic-related PM10 emissions come from brake wear, automotive industry, raw material manufacturers and regulatory organizations have a shared responsibility to follow up dust emissions released during braking, and come up with innovative solutions to overcome this environmental threat.