Research On Iron-based Wear-resistant Material In Automobile Braking System

Accompanied with the high-speed development in the automotive industry field,demands for safety is getting higher and higher. So demands for useful life, safety andstability is more and more stricter about wear-resistant materials in automotive brakingsystem. In order to achieve the requirements of the wear-resistant materials in automotivebraking system, The iron-based composite surfacing material as the research object, Si andMo can be constructed into iron-based hardfacing alloy system in order to obtain differentstructural components, make provision to develop into automotive braking system wearbrake pads in the future. Adhere abrasion between the brake-block and the brake disc is amajor failure factor in the automotive braking system, through the study of the iron-basedwear-resistant materials, improving its ability to resist adhere abrasion, it is a significancefor automotive brake wear-resistant materials. This subject adopts Fe-Cr-Mo-C andFe-Cr-Si-C alloy systems, In order to explore the influence regularity of Mo and Sidifferent content of wear-resistant materials in Fe-Cr-C alloy, and seek to find the bestcontent of Mo and Si in Fe-Cr-Mo-C and Fe-Cr-Si-C alloy systems, which has the bestability to resist adhere abrasion.Pure molybdenum powder, high-carbon ferrochrome powder ferrosilicon powder,reduced iron powder, graphite and pure nickel powder were used for the raw material inFe-Cr-Mo-C and Fe-Cr-Si-C alloy systems in experiments, according the proportion of rawmaterial to mix powder, and coating on the surface with sodium silicate in20g steel.Beginning experiments in the plasma arc surfacing after desiccation. The microstructure,structure, composition, phase have been analyzed in the equipment of the X-ray diffractionanalyzer, scanning electron microscopy, optical microscopy, spectroscopy analyzer,rockwell hardness tester, micro hardness tester, pin-on-disc wear testing machines andphase diagram for Fe-Cr-C alloy system. At last, find the best ratio of the alloy.The results showed that the Cr25-30%, C5-10%, Ni0.5-1%, and the rest of Fe wasconstant in the Fe-Cr-Mo-C alloy system, there are a large number of M7C3and Mo2C ceramic hard phase formed in the surfacing layer when the Mo element content of9%, themacro-hardness of the surfacing layer is59.2HRC, the wear extent is0.0003g, thecoefficient of wear is0.34; which has the best ability to resist abrasion. Keeping the Cr25-30%, C5-10%, Ni0.5-1%, and the rest of Fe was constant in the Fe-Cr-Si-C alloysystem, when the Si content is1.5%, the macro-hardness of the surfacing layer is63HRC,the wear extent is0.0001g, the coefficient of wear is0.26, which has the best ability toresist abrasion.