Microstructure Exploration of the Aluminum-Tungsten Carbide Composite with different Manufacturing circumstances
In the last decade, as demand for high quality materials are increased, the development of lightweight aluminum (Al) also increased especially in aerospace and automotive industries. It has been well known that Al based metal matrix composites (MMCs) offers a very low thermal expansion coefficient, high specific strengths, wear and heat resistance as compared to conventional Al alloys. In order to combine all these properties, MMCs have become a very attractive method for various industrial applications. The interest in Tungsten Carbide (WC) as reinforcements for aluminum (Al) has been growing considerably. Efforts have been largely focused on investigating their contribution to the enhancement of the mechanical performance of the composites. The uniform dispersion of Tungsten Carbide in the Al matrix has been identified as being critical to the pursuit of enhanced properties. In this present research paper emphasis, the effect of Tungsten Carbide content on the Physical properties of the composites like SEM, XRD was investigated. The improvement of physical properties for composites of Al/WC has been compared with pure aluminum.
The mechanical and tribological characteristic of Aluminium-Titanium dioxide composites
The purpose of this work was to investigate the mechanical and tribological effects of Titanium dioxide (TiO2) reinforcement in Aluminium (Al). Aluminium composites consist of 99.8% pure aluminium reinforced with five different partions of TiO2. Aluminium powders were mixed with TiO2 by ball milling for 30 minutes in a planetary mixer. The powder mixture was compacted by the cold pressing technique at 250 MPa. Two different methods used for sintering. The green compact was sintered at 600 °C for 300 seconds in open atmosphere with an Ulta-High Frequency Induction System (UHFIS) and with furnace at 600 °C for 1800 seconds. The mechanical and microstructural properties of examples were compared for different amount of reinforcement. We have observed a maximum hardness for 5 wt.% TiO2 reinforced composites.
Wear formulation for aircraft brake material sliding against steel
Abstract The effect of sliding variables on the wear of the copper-based brake material currently used in aircraft, sliding against 17–22 AS steel in a caliper brake, has been studied. The surface temperature T resulting from frictional heat varies non-linearly with the applied load L and the slide time t at 1750 rev min−1, i.e. T = P1LP2tP3 where P1P2 and P3 are parameters which can be related to the frictional coefficient and to other properties of the materials involved. The wear ΔW of brake materials is then proportional to this temperature relative to the melting point T ∗ of copper: ΔW = K T T ∗ −T where K is a constant. Essentially, this means that the wear mechanism is a temperature-dependent phenomenon in which the melting of the copper matrix plays an important role. A computer program was applied for curve fitting of the experimental data.