Climate Based Performance of Carbon-Carbon Disc Brake for High Speed Aircraft Braking System

Abstract

Carbon composite brake discs are lighter, economical, and have excellent high energy friction characteristics. These have twice thermal capability compared to steel, remain unaffected by thermal shocks and mechanical fatigue. These are highly useful in emergency breaking situations. Prior to this work, two dimensional (2D) reinforced carbon composite laminates were prepared through pitch impregnation process. In an effort to protect the exposed non frictional surface from high temperature service degradations, multilayered ceramic coating systems were developed on 2D composite. Oxidation studies have been carried out on these systems viz., C-SiC, C-SiC-MoSi 2 -Al 2 O 3 and C-SiC-B 4 C. These were performed both in dynamic and static conditions up to 1200 °C in 60 per cent humid climate. The hardness, surface topography, developed phases and integrity of layers on the samples at various stages of the experiment have been characterized and analyzed. It was observed that C-SiC-B 4 C system performs well in the oxidizing environment.

A High-Efficiency Technology for Manufacturing Aircraft Carbon Brake Discs with Stable Friction Performance

“…The large dispersion of its friction coefficient was mainly due to the poor uniformity of the surface and inner layers of the material caused by the closing of many pores in the later stage of densification. Better material uniformity leads to a more stable friction coefficient [39][40][41].…”

Frictional Heating during Braking of the C/C Composite Disc

“…A scheme of such multi-disc system and the calculation diagram of the considered problem are presented in Figure 1. A microscopic view of the real structure of such C/C composite can be found in [15,20] and sample photo of single brake disc made of Termar-ADF in [31]. friction surface, while the inner rotating and fixed discs have two friction surfaces, and thus they heat up more.…”

“…Two basic advantages of C/C materials at high temperatures-the heat capacity and strength (higher by 2.5 and 2 times, respectively, than steel)-result in a 40% weight savings [2]. These remain unaffected by thermal shocks and mechanical fatigue [15]. Due to such a specific combination of the properties, C/C composites are more widely used for producing brakes subjected to heavy loads and extreme application conditions, and can be considered as the basic construction material for high-temperature applications, e.g., in aerospace and aircraft industry brake systems.…”