This paper discusses the wear and friction with the 2 W% Al2O3 nanocomposite content of pure Mg and AZ91D Mg alloys. Sliding speeds of 0.5 and 1.5 m/s in cast materials with normal stress conditions have been used in sliding distances up to 2000 m/s (0.5, 1.0, and 1 MPa). In order to evaluate the work hardness of the materials measured on temperature similar to the contact surface, we used hardness patterns and hot-compression flow curves. Mg and AZ91D magnesium alloy pure monolithic Mg are low wear resistant due to an increase in contact temperature due to the adjustment of working conditions, but the wear rate was significantly lower in composite materials, mainly because of nanoparticle strength improvements. Although wear generally contributes to grain refining, increased wear capacity, and greater durability, wear resilience due to dislocation resistance and nanoparticles is seen as the primary wear mechanism in the existing nanocomposites.

This paper presents a novel comb drive based MEMs capacitive pressure sensor for measuring the pressure inside the lubricating system. The working principle and design analysis of the proposed MEMS comb drive capacitive sensor is explained. The diaphragm thickness is a primary factor in determining the pressure sensor sensitivity. MEMS technology allows diaphragm to be very thin compared to conventional machining. This comb drive capacitive pressure sensor isolates the pressure sensing diaphragm from its capacitance sensing movable comb plate by a mechanical coupling so that it increases the pressure sensitivity. The design and simulation of the sensor is analysed using Comsol Multiphysics 4.4 • The stress distribution of the membrane and capacitive sensitivity analysis is carried out for the range of pressure from 0 to 10 bar. The dimension of the Capacitor plate with comb is 200/lm x200/lm x3 /lm. The sensor works efficiently in the range of 30°C to 270°C. The main purpose of the novel design is even a small change in the capacitance in the range of atto farad (aF) can be sensed accurately by this model.

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MEMS Comb drive type capacitive pressure sensor with high sensitivity can be used in many applications like Aerospace, Automobile, Bio MEMS, etc. This Paper is focused on the review of various types of MEMS Materials used in capacitive pressure sensor. In this paper comparative analysis of different types of MEMS materials are presented. The principle and design of proposed MEMS Comb drive type capacitive pressure sensor is explained. The MEMS comb drive type capacitive pressure sensor is simulated using COMSOL multiphysics 4.4 version. Centre deflection or deformation of a thin diaphragm and capacitive sensitivity analysis are carried out for various types of MEMS material. The analysis is carried out for the range of pressure from 0 to lOOOOON/m 2 • Finally the comparisons of MEMS materials used in Comb drive type capacitive pressure sensor shows that Aluminum (AI) has high capacitive sensitivity about 36aF/O.lbar is obtained.